bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Countermeasures of Intelligent Manufacturing Training Base Serving Local Industry Collaborative “Three Chains” Innovation
Authors: Zhu Ximing
Published: January 2021

With the needs of the transformation and upgrading of the manufacturing industry and the continuous iteration of high-end technology, the service transformation of enterprises and the service of local industries by higher vocational colleges are strategic challenges that schools and enterprises need to face together. Research has found that technological innovation and school-enterprise cooperation model innovation can promote service-oriented transformation, but there is currently a lack of in-depth interpretation of the synergistic interaction between the two. This article takes the intelligent manufacturing training base of higher vocational colleges serving local industries in Liaoshen as an example to study the dynamic interaction mechanism of the deep integration of schools and enterprises under the background of manufacturing technology and service transformation. The author puts forward the process mechanism of school-enterprise cooperation on the industrial chain of local industries and other “three chains” collaborative integration and innovation. The research result of this paper is to find that the mode of intelligent manufacturing training base is the key to the transformation and upgrading of manufacturing enterprises to serve local industries. At the same time, the author finds that the transformation process of manufacturing enterprises is a process of industrial chain collaboration, integration and innovation.
Design and Development of Database System for Turning and Milling Compound high-speed Machining
Authors: Li Zhou , Feng Lin Jun , Chao Miao Ying
Published: January 2021

In order to realize the advantages of high-speed cutting machine and improve the efficiency of high-speed cutting, a turning and milling compound high-speed machining process database was studied. According to the data information of cutting lathes, workpiece materials, tools and high-speed machining parameters, the functional requirements, system roles and system data relationships of the database system were analyzed. Based on the above information, the functional module, basic database, user permission and system architecture were designed, and a compound high-speed machining database system which is suitable for lathes and milling machines was developed.
Research on Key Performance Evaluation Technology of Intelligent Unmanned Platform
Authors: Zhang Qi , Su Yiming , Yang Shuiwang
Published: January 2021

According to the evaluation requirements of ground unmanned platform, this paper designs from three aspects: main function evaluation, technical index evaluation and tactical index evaluation, and preliminarily forms the evaluation method of unmanned platform, which lays the foundation for establishing relevant technical specifications of unmanned platform.
Lip Viseme Analysis of Chinese Shaanxi Xi’an Dialect Visual Speech for Talking Head in Speech Assistant System
Authors: Lu Zhao , Czap László
Published: January 2021

Recently, multimedia, especially animation, has played an important role in language learning. It has made a significant contribution to the language learning process of the hearing impaired for learners of all ages, especially the 3D animation of virtual teachers in computer-assisted language learning applications. Researches on viseme in various official languages and 3D facial animations have emerged in various countries. This paper has done lots of work in order to created Chinese Shaanxi Xi’an Dialect viseme data base by lip viseme analysis. Series of lip visemes frame data was gained by processing this dialect images and videos taken by camera. The classification of the lip viseme of this dialect also made based on the lip viseme classification of Mandarin. This work has great significance to create realistic 3D facial animation of this dialect.
Digital core image registration based on SIFT features
Authors: Wang Yuxue , Zhang Xue
Published: January 2021

In this paper, SIFT features and FLANN matching are applied to digital core image registration to achieve the purpose of fast digital core image registration. In this paper, three groups of digital core images data are used to carry out experiments from different aspects of rotation, brightness, translation and the combination of the three. The experimental results show that the method in this paper can effectively perform digital core image registration.
The reform of modern education during the COVID-19 pandemic
Authors: Xu Yan , Tang Qianqian
Published: January 2021

Great changes have taken place in modern education methods under the influence of the COVID-19 pandemic. Information science technology has broken through the time and space limits of education, as well as the boundary between physical and virtual objects in learning, and has converted the process of learning from passive to active. These characteristics just meet the needs of education under the challenges of the COVID-19 pandemic. Therefore, the new education mode which integrates information science technology has been developing rapidly during this period of time. This paper summarizes how the development of modern information science, especially network technology, multimedia technology and virtual reality technology, has influenced modern education. Meanwhile, our efforts and work in regard with digital museum will be introduced in this article.
An Infrared small target detection method based on local contrast measure and gradient property
Authors: Li Xiang , Xu Guili , Wu Quan
Published: January 2021

Infrared small target detection plays an important role in infrared search and tracking applications. In order to solve the problem of detection has high false alarm rates and low probabilities with complex backgrounds. An infrared small target detection method based on local contrast measure and gradient property (LCG) is proposed in this paper. Initially, the contrast map of the input image is calculated using the modified local contrast measure which is employed to enhance target and suppress background. Then, according to the property of distribution regularly around the target, the gradient map is calculated from the input image to further suppress clutters. Next, the feature map is achieved by integrating the local contrast map and gradient map in a pixel-wise multiplication manner. Finally, an adaptive threshold is used to extract the target region. Experimental results on two real sequences demonstrate that the proposed method has a good performance in background suppression and target enhancement. Besides, the proposed method has satisfying robustness under complex backgrounds.
Research on training top-notch applied talents of statistics based on OBE concept
Authors: Tian Xiujie , Cheng Chunlei , Wu Di
Published: January 2021

In the context of big data, the massive amount of data generated at all levels and fields of society and economy has made the market for top-notch statistical talents increasingly demanding. However, the current training of statistics professionals is mostly curriculum-oriented. It pays more attention to theoretical knowledge while the effect of practical ability training is not good. It is teacher-centered and ignores the fundamental goal of student learning results. Reform the training model of top-notch applied talents in statistics from the perspective of OBE education concept, that is, to be oriented by industry needs, clarify the learning outcomes and graduation requirements of statistics to reform the teaching system, then cultivate top-notch statistical talents who can meet the needs of the times and social development.
BP Neural Network for the Signal Recognition of Micro-Energy Devices
Authors: Zhang Chuting , Wang Haopeng , Zeng Huaiwang , Chen Guo , Kang Wei , Zhang Bin
Published: January 2021

The recognition of electrical energy generated by different micro-energy devices is a key step for effective energy management in the integrated microsystems. In this paper, we present an improved Backpropagation Neural Network (BPNN) model in conjunction with principle component analysis (PCA) and Levenberg-Marquadt (LM) algorithm. The open-circuit voltage curves containing the noise characteristics from three different types of micro-energy device including radio frequency energy harvester (RFEH), solar cell (SOR), vibration energy harvester (VEH) are used as input vector for classification model training and validation. The classifier of our model achieves a recognition accuracy of 100%, 91.8%, 83.1% for RFEH, SOR and VEH, respectively. These results indicate that our model is valid for energy recognition for these micro-energy devices and may further apply for hybrid energy management in smart systems such as wireless sensor networks (WSN).
Joint Network Smoke Recognition based on Channel Attention Mechanism
Authors: Jin Shanju , Zhao Tongzhou , An Xiaoyun
Published: January 2021

Aiming at the problems that traditional fire smoke recognition methods in a low recognition accuracy, a fusion network based on VGG16 is proposed, which use channel attention mechanism and contain Dense Blocks network to extract smoke features. To avoid the loss of smoke features, channel attention mechanism in backbone network is automatically to learn the importance of feature in this network. The experiment results show that the accuracy of this network is 3.0% higher than VGG16 neural network, and which is effective and feasible in smoke recognition tasks.
Research on OCT Image Diagnosis Algorithm for Diabetes
Authors: Liu Yunxiang , Chen Jian
Published: January 2021

Non-proliferative diabetic retinopathy (NPDR) is an early stage of diabetic retinopathy. Effective testing can stop the disease from developing. In this paper, a 7-layer convolutional neural network after migration learning based on MATLAB R2017a, was used to perform image recognition on the full-eye OCT images of normal and NPDR at various stages. The full-eye OCT images for the testing set and training set were obtained from an open source database at duke university. A total of 120 images were obtained by optical coherence tomography. There were four types of images, including 30 OCT images of normal, NPDR type 1, NPDR type 2 and NPDR type 3. We labeled 120 full-eye OCT images numerically and divided them into a training set and a testing set, 60 each. The first 15 pictures of each category are used as the training set, and the last 15 pictures are used as the testing set. Four images were randomly selected from the 60 testing set images to determine which of the four categories the extracted full-eye OCT images were. Finally, the accuracy of the convolutional neural network after transfer learning reaches the expected effect.
Application of combined gas chromatography and dielectric spectroscopy in SF6 gas insulated high voltage converter transformer bushing insulation performance
Authors: Gong Lin , Zhang Shiling
Published: January 2021

High voltage converter transformer bushing is widely used in the outlet part of high-end converter transformer, and its operation safety and stability directly determine the operation effect of converter transformer. The bushing of SF6 gas insulated high voltage converter transformer is a typical multi-media insulation structure. The air end of the bushing includes SF6 gas insulation medium, and the bushing tail is in contact with transformer oil. The bushing body is generally epoxy impregnated paper composite insulation structure. For the complex insulation system, the running state of converter transformer bushing should be monitored in real time. For gas phase insulation, gas chromatography is generally used to dynamically analyze the composition of SF6 gas; for epoxy impregnated paper solid insulation, dielectric spectrum technology is generally used to analyze its wide frequency domain dielectric characteristics. Therefore, the combination of gas chromatography and dielectric spectroscopy technology can effectively characterize the insulation performance of SF6 gas insulated high-voltage converter bushing. In view of this, this paper first gives the basic theory of frequency domain dielectric spectroscopy technology and gas chromatography technology, and further analyzes the current carrying and heating conditions of the central conductor of high-voltage converter bushing under overload and short-circuit conditions. The dielectric spectrum characteristics of the converter bushing core under different temperature conditions are obtained by experiment, and the Cole-Cole model is used for fitting analysis. The decomposition characteristics of SF6 insulation gas in epoxy resin composite insulator under overload and short-circuit conditions are analyzed experimentally, and the variation curve of SF6 characteristic decomposition gas with time is obtained. Combined with the above relationship between gas chromatography and dielectric spectrum, an operational evaluation strategy for the performance of SF6 gas insulated high voltage converter bushing is proposed. In this paper, for the first time, the internal insulation performance of high-voltage converter bushing is comprehensively evaluated by gas chromatography and dielectric spectrum analysis technology for the first time, which has certain theoretical and practical application value for the operation, maintenance and overhaul of converter bushing.
Study of Power System Oscillation with Wind Power Equipping Frequency Regulation
Authors: Yang Lei , Huang Wei , Wu Chen , Li Shengnan , Chen Yixuan , Kang Hongkai
Published: January 2021

As more and more countries and regions stipulate that wind farms need to have frequency regulation, especially in the power grid with high proportion of wind power. It’s very clear that frequency regulation can improve the frequency dynamic of power system, but the influence of frequency regulation on power system oscillation is uncertain. This paper focuses on this influence and presents a linearized model to analyze the participation of the factors. In the end, a case system named four machine two area system is applied in the simulation to verify the validity of the model.
Interoperability Analysis of Compensation Topologies for Inductive Power Transfer System
Authors: Gao Feng , Deng Junjun , Luo Zhiwei , Zhao Zhigang , He Gang , Zhao Hongzhi
Published: January 2021

This paper aims to discuss the interoperability of compensation topologies for the inductive power transfer system. Based on the common practice of the compensation design, three possible cases which may happen are analyzed, including LCC-S, S-LCC, and LCC-P compensation topologies. In order to evaluate the performance of these three topologies, an analysis method is proposed to investigate the electrical characteristics. The output voltage, current and power of the different topologies affected by variations of the coupling coefficient and the ratio of secondary inductance to primary inductance are analyzed to evaluate their performances. Further simulation models are built to compare the output performance of different compensation topologies.
Aerothermodynamics Response of Hypersonic Flow over a Blunt Cone under Distributed Rough Element
Authors: Tang Xiaojun , Zhang He , Yu Juan , Tang Caiyan , Li Haixia
Published: January 2021

A direct numerical simulation method is used to simulate the hypersonic blunt cone flow field under the condition of smooth wall and distributed rough element. The effects of smooth wall and distributed rough element on hypersonic flow field and wall are compared and analyzed, and the aerothermodynamic response characteristics of hypersonic flow field to distributed rough element are studied. The results show that the effect of the distributed rough element on the hypersonic flow field and boundary layer is significantly higher than that of the smooth wall. The friction coefficient of the wall is directly proportional to the velocity gradient of the flow direction in the boundary layer, while the velocity gradient of the flow direction is inversely proportional to the thickness of the boundary layer. The heat flux density of the wall increases at the front edge of the rough element to promote the heating, and decreases at the second half of the rough element to inhibit the heating.
B-spline Function Modeling of Electric Heating Flow Regulating Valve
Authors: Zhang Xingchao , Yang Chengzhi
Published: January 2021

In this paper we propose a modeling approach of electric heating flow regulating valve with B-spline function and recursive least squares method. And by means of the analysis of the structure and working principle of electric heating flow regulating valve, its correctness is validated with MATLAB simulation. The results indicate that this modeling method can realize the minimum error approximation of real working state of electric heating flow regulating valve.
Construction of digital twin ecosystem for coal-fired generating units
Authors: Yan Xiufeng
Published: January 2021

With the development of big data, cloud computing, Internet of things, digital twin and other technologies, the deep integration of these technologies with the energy industry is becoming the demand of production management progress, intelligent power generation has become the trend of development in energy industry.. This article gives an overview of the digital twin ecosystem of coal-fired generating units. The construction of the digital twin ecosystem is carried out from the overall architecture, and it is given a detailed introduction to DCS interface architecture, communication architecture. The digital twin ecosystem can realize real-time twins, predicting twins, simulating twins, and state evaluation, monitoring and early warning, fault diagnosis, optimization guidance, three-dimensional visualization and other functions, which can provide a predictable and visualized big data monitoring platform for real-time monitoring of the entire process of power plant operation, transparency of operation management, and timely discovery of equipment status.
Research on test method of elevator wire rope under special environment
Authors: Xue Zhaoling , Chang Xiaoqing , Feng Shuangchang , Fang Liang , Liu Yuming
Published: January 2021

In order to analyze the influence of different special environment on the fatigue performance of elevator wire rope, this paper refers to the existing bending fatigue test method of wire rope, and other standard to simulate different environment conditions, a test method of elevator wire rope in special environment is presented in order to study the fatigue life and scrap condition of elevator wire rope in special environment.
Construction of the training mode system of electric power skilled personnel in Tibetan areas
Authors: Liu Ruihua , Zhu Kang , Wen Hairong , Yang Li , Xi Chuan
Published: January 2021

This paper analyzes the characteristics of the electric power personnel training mode in Tibet, and divides the system into five main subsystems: training support subsystem, training quality assurance subsystem, teaching and training subsystem, training management subsystem and training target subsystem. It defines and preliminarily divides the five subsystems and their subordinate elements Analysis.
Research on Intelligent Monitoring and Early Warning of Electric Power Safety Based on Artificial Intelligence Technology
Authors: Liu Yu , Wang Zuowei , Pan Yingli , Zuo Yue
Published: January 2021

In recent years, with the continuous improvement of the national economic development level, the scale of urban construction in China is also gradually expanding. Therefore, since the monitoring system plays an important role in various industries, the establishment of an intelligent automatic management system can determine the unstable factors in the monitoring management and improve the safety performance of the monitoring system, so that the normal operation of the monitoring platform can be maintained. The establishment and function of the intelligent monitoring and early warning system are analyzed and studied in the paper, which combines traditional video monitoring equipment and data acquisition equipment into one, and launches a monitoring and early warning solution.
Parameters optimization of release force under top-excited in stuck pipe
Authors: Zheng Zhibin , Chen Jingkai , Zhang Yanting
Published: January 2021

Stuck drilling accident is one of the most frequent accidents in the drilling process. The operation time of release drilling is also one of the most time-consuming operations in workover process. In recent years, the technique of release, by drilling string resonance, has been introduced into the drilling field, greatly reducing working hours and improving efficiency. In this paper, the release force’s sensitivity analysis is introduced to optimize the design parameters of the device and the working parameters of the release process. First, the pipe vibration behavior under the surface vibration agitator’s action is analyzed, and the natural frequencies are obtianed analytically. Second, based on Rayleigh damping and specific boundary conditions, the damping effect equation of drilling fluid is derived under drill string vibration. Finally, the influence of structural parameters, environmental parameters, and working parameters on the clamping force is obtained. This paper casts carry through the theoretical interpretation of the release force’s sensitivity analysis by stuck release mechanism and is of significance to optimize the stuck release operations.
Study on microscale flow characteristics of electrorheological Fluids
Authors: Zhu Shisha , Lei Xianhua
Published: January 2021

Electrorheological fluid is a kind of intelligent material whose rheological properties change rapidly and reversibly under the action of external electric field, It has a broad prospect in practical engineering application. It is found in the research progress of electrorheological fluids. The time scale and space scale of the electrorheological effect are very small, and the flow process has some micro-scale flow characteristics. In this paper, the dynamics of dielectric particles in electrorheological fluids under static and dynamic coupling fields is numerically simulated by dissipative particle dynamics method. The influence of surface force under static field on the submicrostructure of Electrorheological fluid and the influence of electroviscosity under dynamic coupled field on the flow rate of Electrorheological fluid are also studied.
The solution of oil leakage on the joint surface of the combustion chamber casing and the rear jacket
Authors: Zeng Xianghu , Xu Ying , Zhang Yue , Xu Zhanghuan
Published: January 2021

In order to solve the problem of oil leakage at the flange bolted connection of the casing of combustion chamber, an implementation solution was proposed in this paper. Firstly, a simplified flange bolted connection finite element model was established in ANSYS based on the actual size of the casing. Then, the deformation of the flange joint surface under two different forms of load was analyzed. Finally, according to calculation results, the suggestion of adding gasket was proposed to improve sealing performance of casing, and the sealing effect of gaskets of different thicknesses is also studied. This article provided a reference for improving the oil leakage problem of the casing flange bolted connection.
Research on automatic correction method of spiral bevel gear error reversal based on single chip microcomputer
Authors: Xu Hang , Tian Jiule
Published: January 2021

Because the traditional error correction of spiral bevel gears is based on the experience of technicians to manually adjust the parameters of production equipment and machine tools, the error range of gears in production is difficult to control, which affects the pass rate of gear production. Aiming at the above problems, the automatic correction method of spiral bevel gear error reversal based on single chip microcomputer is studied. On the basis of setting up the machining parameter model of spiral bevel gear, the gear data is measured and controlled by single chip microcomputer. After processing the measured gear data, the parameter error of the machine tool is reversed. The experimental results show that the error correction method based on single chip microcomputer can reduce the error and improve the pass rate of gear.
Research on chip removal mechanism of pulse fluid negative pressure in deep hole machining
Authors: Zhang Xiao , Dong Zhen , Zhang Zhi Bing , Yao Fang Ping
Published: January 2021

The processes of deep hole parts is prone to chip blocking due to its large length-to-diameter-ratios. Aiming at this problem, this paper designs a pulse negative pressure chip removal device based on a negative pressure chip removal system, which realizes the supply of pulsed chip removal fluid, and establishes the pulse fluid mathematical model of the device, and analyzes the effect of pulse supply fluid on the effect of chip removal. The simulation test of its chip removal effect is carried out by the Fluent software, and the results show that the pulsed oil supply device can make the chip produce relaxing combined suction force in the chip drain channel and alleviate the occurrence of chip blocking phenomenon.
Simulation of transverse movement of tugboat without wind and waves
Authors: Wang Xiang , Zhu Yuzhu
Published: January 2021

The operation of berthing and unberthing large liquefied gas vessels, the operation of offshore berthing and unberthing rescue, the positioning of drilling platforms and other projects all require the assistance of Azimuth Stern Drive(ASD) tugboats. Traversing maneuver is one of the most important maneuvers of ASD tugboat. The process of traversing is unstable, complicated and easy to be interfered by the outside world. It is prone to tail flick and other dangerous situations. On the basis of previous studies, this paper uses the “Liangang 21” tugboat to carry out simulation experiments, realizes the tug’s lateral movement control, and gives the relationship between the engine speed, propeller deflection angle and lateral movement. It is of great practical significance to the actual operation of the ASD tugboat and to improving the safety of offshore operations.
Research on Lightweight Design and Finite Element Analysis of a 9 Meter Bus Body Frame
Authors: Yao Chunge , Yang Mengjie
Published: January 2021

The finite element model of a 10 meter bus body frame is built in Hypermesh software. The static force and modes of bus body frame under four typical working conditions are calculated by Nastran solver. The simulation of results show that the strength, stiffness, low natural frequency and vibration mode of bus body frame satisfy design requirement, and have enough potential reserve. Under the premise of ensuring the strength, stiffness and modal characteristics of bus body, the bus structure and dimensional parameters of parts are optimized to realize the lightweight design of bus body frame. The weight reduction rate of the optimized body frame is 10.57%, which verifies the feasibility of the optimized scheme.
Flight design and dynamics analysis of a new water-air UAV
Authors: Zhang Yan , Chen Xu , Zhou Jie
Published: January 2021

In the field of UAV research, water-air amphibious is an important direction. If water-air amphibious is realized, the UAV will no longer be restricted by the space field, and can realize various functions in the three domains of water, land and air more flexibly and freely to complete various flight and exploration missions. Therefore, this paper designs the model and flight algorithm of a new type of water-air amphibious variable wing UAV, and verifies the dynamic analysis of the relevant flight components of the UAV.
Mechanical structure design of a modularized vertebral detection and therapy instrument
Authors: Yang Yuxin , Lin Sheng
Published: January 2021

Compared with traditional hands-free massage therapy, vertebral detection and therapy instrument has shown good performance in improving therapeutic effect and safety. At present, foreign vertebral detection and therapy instrument have complete functions. However the cost of the instrument is expensive. Domestic vertebral detection and therapy instruments are cheaper, but the function of detecting muscle hardness is lack. In this paper, the mechanical system of a modularized vertebral detection and therapy instrument is designed. The mechanical part of the instrument is composed of three separable working modules. It has the function of detection and treatment with low cost. The modular design of the instrument solves the problem of overheating during operation, and makes it show some advantages in maintainability, expansibility and other aspects.
Research on Model Structure of SDN Based on QoS Strategy
Authors: Ren Jiyuan , Song Yang , Wang Zhe , Liu Fuyang
Published: January 2021

The network candidate routing data stream is restricted to reroute the data stream of same origin and same destination, which brings great limitation to the application of the algorithm. This paper proposes a multi-objective optimization oriented rerouting algorithm for congested data streams. The algorithm detects and aggregates data streams on congested links, and reroutes the detected data streams. When there is no data stream, the data streams are arranged from large to small in the congested links, and the appropriate number of data streams are selected as candidate data streams, and small streams are aggregated by source and destination addresses. In order to determine the maximum network traffic and the optimal routing of candidate data streams, multi-objective optimization is introduced to jointly optimize the network load data stream maximization and network load balancing. Finally, a non dominated genetic algorithm with elite strategy is designed to solve the multi-objective optimization problem.
Diagnosis and treatment of an abnormal vibration caused by oil whirl
Authors: Ma Lyuzhou
Published: January 2021

During normal operation of a 680MW unit, the vibration of No.1 bearing frequently fluctuated greatly, which caused the unit to trip. Through the test and analysis of the vibration data, it was diagnosed that the cause of vibration was oil whirl caused by insufficient bearing stability. By optimizing the installation data of bearing and adjusting shafting center, adopting special method to strengthen the stiffness of No.1 bearing, the stability of bearing bush was improved. After vibration treatment, the vibration of No.1 bearing returned to normal value.
Generic Tool path planning method of T-spline surface CNC milling
Authors: Rui Li , Chen Jie , Liu Xin , Yang Yan , Hu Xin , Li Jin-Quan
Published: January 2021

T-spline is a new surface modeling technology, which has superior advantages in complex shape representation over traditional NURBS and mesh surfaces. However, the research in CAM field is insufficient, which hinders the further promotion of this technology. To fit the complex topology of T-spline surface, a general tool path planning method of T-spline surface CNC milling is proposed based on the commonly used zig-zag or contour-parallel toolpath pattern. This method utilizes the 2-dimensional scallop height model to calculate side step, the iso-scallop height method to generate tool paths, the minimum energy method to smooth them, and Hermite curves to join them as one tool path, which can realize the milling of T-spline surface model with arbitrary topology. Finally, a T-spline CAM prototype system is successfully developed to implement simulation analysis and machining experiments to verify the algorithms above. And the results of simulations and experiments prove this method can generate a smooth tool path with uniform iso-scallop height distribution, short length, smooth corner transition, and one retraction, which can achieve better finish machining effect.
The Assist Performance Test of Industrial Passive Waist-assistant Exoskeleton on Fatigue during a Repetitive Lifting Task
Authors: Zeng Dezheng , Qu Shengguan , Ma Tao , Yin Peng , Gao Hongyun , Zhao Ning , Xia Yumeng
Published: January 2021

Low back pain is a serious industrial problem and a common chronic disabling disease that affects the health of many workers, with a steadily rising rate of incapacity due to low back pain and a burden on individuals, families, businesses and society. Therefore, a new type of wearable lifting assist device, called the Industrial Passive Waist-assistant Exoskeleton (IPWE), was developed for workers’ working conditions to reduce the risk of lower back muscle damage during manual handling. The purpose of this study was to evaluate the impact of this IPWE on the muscle activity and oxygen consumption of the lower back in simulated lifting tasks. Meanwhile, local perceived stress, subjective perceived fatigue and system availability of the exoskeleton system were evaluated. The results showed that the IPWE significantly reduced the muscle activity of the thoracic erector spinaes and lumbar erector spinaes. During the 15-minute repetitive lifting task, the electromyographic amplitudes of the thoracic erector spinae TES1, TES2 and the lumbar erector spinae LES1, LES2 decreased by 19.14%, 14.63%, 28.03% and 25.05%, respectively. In addition, the exoskeleton did not cause significant differences in oxygen consumption and subjectively perceived fatigue. But it caused increased local pressure on the thighs and shoulders. Among them, IPWE was considered to have acceptable availability by half of the subjects. However, the obvious contact pressure on certain body parts were the cause of discomfort caused by IPWE.
Design and experimental study of the remote control for a novel patient transfer apparatus
Authors: Tian Yu , Wang Hongbo , Zhang Yongshun , Tian Junjie , Du Jiazheng
Published: January 2021

This paper introduces the design of the remote control for a novel patient transfer apparatus. First, the overall design of the control system is put forward based on the working principle, and design requirements of the apparatus. Second, voltage regulator circuit of the remote control based on the MC34063 is designed to fit for the OLED displayer, parameters such as the filter capacitor have been determined. Next, wireless communication unit adopted CC1110 and the communication instruction code is introduced. Then, the interaction interface of the remote control is finished to facilitate the implementation of the adjustment functions. finally, a simulation and a real experiment has been completed, it indicates the correctness of the voltage regulator circuit and the effectiveness of the remote control respectively.
High-precision video acquisition system based on three-axis linkage
Authors: Qi Wen , Zhang Meng , Wang Yue , Chen Jin
Published: January 2021

The main research content of this system is to realize the linkage control of multi-axis motor through LabVIEW and single chip microcomputer. The operator can operate the upper computer software to send the speed and spatial coordinate instructions remotely. The expansion chip ch438q is used to store temporarily, and then the data is transmitted to the processor of max13487 for control. According to the RS485 serial port communication mode, the analyzed data parameter information is transmitted In the stc15 single-chip microcomputer on four single axis control cards, the motor is controlled by the driver to make the controlled object move to the specified position quickly and accurately. In the process of movement, the upper computer can display x, y in real time. In order to test and use the system to achieve certain functions, a set of high-precision multi angle video acquisition system based on three-axis linkage and four axis control is designed. The selected camera is a 120°wide-angle camera, which can make the range of scenery observed from a certain point of view much larger than that of human eyes in the same view point Monitoring. After many experiments, the accuracy of the system can reach 1μM. The system itself can also expand a variety of functions according to different needs, which has a certain practical value.
Design of six-degree-of-freedom manipulator system
Authors: Xiao Suhua , Wang Zhiyong , Qiao Mingjuan , Wu Pianhui , Lin Yongjun
Published: January 2021

This paper introduces an arm microcontroller STM32F407 as a core control unit of a six-degree-of-freedom manipulator control system (MCU). A 32-bit MCU series chip is selected to be implemented in the system that sends signals to 32-bit MCU via the upper computer software, which further controls the rotation of the steering gear on each joint of the manipulator; thus, the rotation control of a manipulator is implemented. The entire system consisted of a set of components, includes the main body of a manipulator, a steering gear, a servo drive circuit, a serial port communication circuit, a single chip microcomputer circuit, a PC upper computer software, etc. The upper computer sends a steering gear angle data signal to the 32 MCU through the serial communication circuit. The single-chip microcomputer first takes the received corner signal for data processing converting the data signal to the 32-bit MCU. The corner signal is divided into many small signals by a differential interpolation algorithm. Combined with a single-chip timer, these tiny signals are transformed into a PWM wave with a specific width that can be rotated by a steering gear and then sent to the steering gear to reach the target at a steady rate. The control of the manipulator is implemented by the movement of six steering gears.
Molecular Dynamics Simulation of Diamond Cutting Iron with Water Lubrication
Authors: Lan Zhang , Sun Yongquan , Wang Liquan , Ming Liu
Published: January 2021

The water-based cutting fluid plays an important role in cooling and lubricating during cutting process. In order to analyze the role of water in the cutting process from the microscopic view, this paper used molecular dynamics simulation to establish the cutting model with water lubrication by covering a water layer on the surface of iron workpiece. By comparing the cutting heat and friction coefficient under dry cutting and wet cutting, it is found that: water molecules will enter the gap between the tool and the workpiec, preventing the direct contact between the carbon atoms and the iron atoms, thereby reducing the friction coefficient. At the same time, wet cutting can reduce the surface temperature of the workpiece and play a role in cooling and lubricating.
Kinematics Analysis and Simulation Research of Fruit and Vegetable Picking Arm Based on MATLAB
Authors: Pang Chaofan , Yan Shifeng , Li Zongpeng , He Yupeng
Published: January 2021

In order to understand the reliability and stability of the fruit and vegetable picking arm during its operation, a simulation design of the fruit and vegetable picking arm grabbing design was designed. This article mainly takes the picking arm as the research object, adopts the improved D-H method to establish the coordinate system of each joint, establishes the kinematics equation, and solves the kinematics. Using the robotics toolbox of MATLAB software, mathematical modeling and Simulation of picking process are carried out. The simulation results show that the operation of the fruit and vegetable picking arm is very stable, which has certain practical significance for further research on picking robots.
Research and Design of Mobility Aids
Authors: Wang Peng , Wang Yaxin , Su Peng , Wang Mengfei , Yang Yingqian , Luo Meng , Cui Jiang , He Jin , Han Lei
Published: January 2021

This paper designs a multifunctional mobility aid based on the STM32 microcontroller, which mainly provides security for the daily life of the elderly. The paper analyzes the basic working principle of the mobility aid, and designs the mechanized structure; thereby realizing the mechanization, intelligence and multi-functional technical characteristics of the mobility aid, which can effectively avoid the troubles caused by leg failure in function of the elderly, and provide convenience for the elderly to go out.
Development and design of an intelligent guide stick for the blind
Authors: Ren Yunan , Huang Junzhe , He Hui , Wang Yixuan , Zhu Haohan , Li Zhiyu , He Jin
Published: January 2021

China has the largest group of disabled people in the world, and blind people account for a large part. However, we pay less attention to the blind, especially to the infrastructure for their daily life. In this paper, a guide stick was designed based on STM32F103C8T6 microcontroller to improve the safety for the blind. An ultrasonic module completed the distance measurement and GPS module located the blind. When the distance to obstacles was not more than 100cm, the guide stick gave a voice alarm and vibrated to warn the blind. The guide stick broadcasted the distance from its current location to the nearest obstacle when the broadcasting button was pressed. The current location was sent to the guardian by pressing the message button, which was useful especially when the blind user needed help. For experiments, ten blind people walked with guide sticks at different starting distances and speeds according to their own walking habits. 540 groups of data were obtained, among which 498 groups avoided obstacles successfully. The average success rate was 93%. It shows that under the normal walking speed (≤30cm/ s), the guide stick can effectively help the blind avoid obstacles and improve their safety.
Analysis of Chatter and Turning Errors of Basalt Fiber Reinforced Polymer Concrete Lathe
Authors: Xu Ping , Li Wenli , Yu Yinghua , Shen Jiaxing
Published: January 2021

In order to improve the turning accuracy of the lathe, a basalt fiber reinforced polymer concrete lathe bed was designed. In the light of theory, the turning error model of the lathe, the vibration of the lathe-workpiece system and the average amplitude calculation model of turning error are established. The Runge-Kutta method is used to calculate the vibration of the lathe-workpiece. The influence of the workpiece radius and turning parameters on the average amplitude of the turning error is studied. The results shows that average amplitude of the turning error is significantly influenced by feed rate, workpiece radius, back engagement and spindle speed from large to small.
Effect of the width of cut tobacco on the quality of slim cigarette
Authors: Zhao Yunchuan , Zhang Tao , Qiao Xiaohui , Zhao Jian , Hu Qun , Feng Hongtao , Yang Lei , Wu Jiacan , He Xuefeng , Pu Qian , Zhao Meiwei , Qiu Ye
Published: January 2021

In order to further explore the characteristics of slim cigarette processing technology, this study designed different cut width (0.7mm and 0.8mm) of product A, and carried out the experiments of making and rolling under the same process conditions, and evaluated the influence of the width of cut tobacco on the quality of slim cigarette. The results showed that: the 0.7mm cut width has the following advantages: Processing characteristics, Short rejection rate, Reducing draw resistance, Weight stability, Uniformity of density is better than 0.8 mm cut width, and 0.7 mm cut width is more suitable for the production of slim cigarette.
Evaluation of Tribological Properties of Hydraulic Oils by Four-ball Tester Based On Orthogonal Experiment Method
Authors: Chen Li , An Haizhen , Zhen Penghou , Liu Min
Published: January 2021

In order to effectively evaluate anti-wear performance of hydraulic oil, four-ball tester method is used to design an orthogonal test program with 4 factors and 3 levels based on orthogonal test method, and a test method for evaluating tribological properties of hydraulic oils is established. Considering industry standards and combining with actual working conditions of hydraulic system of construction machinery, four factors of load, speed, temperature, and time have been investigated. Evaluating tribological properties of hydraulic oils by wear scar diameters, mean friction coefficient and instant friction coefficient, oil temperature and abnormal noise. The results show that under the selected factors and levels, the significant factors affecting the wear scar diameter are load, speed, temperature and time in order, the optimal test condition is load of 588 N, speed of 600 r/min, temperature of 96 °C, during time of 90 min which can effectively distinguish hydraulic oils with different quality grades. This evaluation method can provide a basis for the selection of hydraulic system oils.
Research on the Relationship between Carbon Precipitation and Mechanical Properties of Dissimilar Steel Welds
Authors: Li Xiuneng , Wu Yuan Jian , Ding Min , Yan He , Yang Chao , Du Liang , Guo Hong
Published: January 2021

After the room temperature tensile test of the pearlite heat-resistant steel and austenitic stainless steel welds after operation, it was found that 75% of the fracture locations were on the austenite side weld line and 25% of the fracture locations were on the austenite side. The maximum tensile strength of the pipe wall under the operating temperature of 530°C and 540°C is 480 MPa and 580 MPa, respectively. Metallographic examination found that there was a “uphill diffusion” near the weld. Through theoretical calculations, after 90,000 hours of operation, on the austenite side of the weld, the difference in carbon increase in the “uphill diffusion” per unit area under the two conditions is about 1.3833E + 8. Based on the analysis of the relationship between the difference in carbon increment and the mechanical properties, it can be deduced that the dissimilar steel weld of this type of screen superheater tube can continue to serve for about 25,000 hours.
Application of PID control in hydraulic synchronous system of cleaning equipment
Authors: Mo Weiqiang , Liu Na , Li Lin , Han Huanqing
Published: January 2021

Aimed at the double cylinder synchronization problems arising from the stroke control system of the automatic cleaning equipment, a master-slave hydraulic synchronous control system controlled by servo proportional valve is introduced. In order to reduce the synchronization error of the double cylinders and improve the dynamic performance of the system, a PID control algorithm is adopted in this system. The PID control algorithm and the system simulation model are established by using Matlab/ Simulink tool. Then the simulation analysis of unit step signal of the system is carried out.
Cross-coupling control of contour error for five-axis linkage machining
Authors: Peng Baoying , Hou Mingpeng , Zhang Milan
Published: January 2021

The accuracy of five-axis linkage machining is influenced by many factors, such as linear axis errors, tool rotation errors, contour trajectory changes, milling force changes, and five-axis parameters do not mismatch. To improve the machining accuracy, the kinematical model of five-axis linkage with B-C double swing head is derived on the basis of RTCP (Rotation tool center point). The following errors of five axis coupled form contour error calculation model is proposed and a cross-coupled controller is designed. Choosing the curve of impeller as an example, a simulation model of five-axis linkage machining is established. Simulation results show that the cross-coupling controller designed for can improve the machining contour accuracy of the five-axis machining effectively.
Design and Simulation of Chopping Device of Straw Returning Machine
Authors: Xu Lichao , Che Yong , Zhu Rong , Zhu Jing , Zhang Rui
Published: January 2021

In view of the shortages of straw conveying to one side, knife wear in straw returning machine, a new type of straw chopping and returning device was designed in the paper. On the basis of briefly describing its structure and principle, the type, number and arrangement method of chopping knife were designed, the solid models of the knife and chopping device were built by applying Solidworks, and finite element simulation analyses were carried out based on Simulation, the results showed that the safety factors of the adopted knives were all greater than 1.5, and the stress distribution of the knife shaft was uniform when moving knives were arranged according to the work order of the engine, after comparing with the maximum stress of the knife shaft arranged according to the spiral line, the stress distribution of the knife shaft decreased by 8.84%, which was conducive to extending the service lives of the knife and the knife shaft.