bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Edge Preserving and Interpolation Algorithm Based on Wavelet Transformation in Mechanical Inspection and Flaw Detection
Authors: Xie Qi , Zhang Ying , Ru Lina , Luo Hongfei , Cui Qingbin
Published: October 2019

In mechanical inspection and flaw detection, the fault point in the image is often small, it is easy to cause the occurrence of missed detection, and due to the internal factors of the imaging system and environmental effects, the final image is often degraded, which is manifested as the deterioration of subjective vision and the decrease of actual resolution. In order to improve the resolution of the image without changing the existing imaging system and prevent the occurrence of the phenomenon of missed detection. An interpolation edge preserving algorithm based on wavelet transformation is proposed, the algorithm firstly performs edge detection and interpolation for low-resolution image, after that, the initial interpolated magnified image was decomposed by wavelet, and the low-frequency component image after wavelet decomposition was replaced by the original low-resolution image. Then, the inverse wavelet transform was carried out to obtain the high-resolution image with good edge information. The experimental results showed that compared with the traditional interpolation method and wavelet interpolation method, this algorithm performs better in the edge visual effect and objective index, and it is an effective algorithm to improve the resolution of detection image.
Bearing degradation trend prediction under different operational conditions based on CNN-LSTM
Authors: Liu Guozeng , Zhao Jianmin , Zhang Xin
Published: October 2019

Bearing degradation research is an important part in condition-based maintenance. This paper tries to propose an end-to-end model to realize bearing degradation trend prediction by vibration signals. Convolution neural network is good at data dimension reduction and feature extraction, and long short-term memory is good at deal with time sequences. The experiment proves that the combination of the two deep learning methods has a good effect, which avoid some disadvantages of traditional methods. Results shows that the model has application value in industrial practice.
Design and mechanical analysis of the loading mechanism of the back-loading garbage truck
Authors: Zheng Xuefei , Guo Jian , Li Sheng
Published: October 2019

In this paper, the loaded garbage truck loading mechanism is the research object. The three-dimensional model of the mechanism is established by software, and the force analysis is carried out under the working condition. Using MATLAB software to draw the curve to show the relationship between compression filling force FL, the pusher stroke x and the installation angle α1, and when the optimum installation angle is selected, the maximum compression filling force FL is 188.29 kN.
Vibration characteristics research of the polygonal effect of scraper conveyor
Authors: Liu Xiaohong , Wei Lubin
Published: October 2019

This article mainly studies the chain of scraper conveyor and analyzes the dynamic characteristics of the chain in the condition of load and load free. Numerical simulation, including the speed of movement and the simulation of chain tension, is used to simulate the special points of scraper conveyor chain. By a series of simulation simulations, the experimental results show that the number and pitch of the sprocket are the main factors that influence the dynamic characteristics of the chain, making the chain produce polygonal effect. Above all, the simulation data shows that the movement is relatively stable and the fluctuation decreases with the increase of the number of sprocket. In the case of load, the tension of the chain tensioning force obviously increases, and the polygon effect of the chain is intensified. Therefore, we hope to provide some theories and basis for our production activities by studying the chain of scraper conveyor.
Blending Spinning to Prepare Flame Retardant Phenolic/Polybutylene Succinate Fiber
Authors: Yang Fan , Bian Angting , Liu Jiuhua , Wang Yanping
Published: October 2019

In order to improve the spinnability of phenolic (PF) resin, a small amount of polybutylene succinate (PBS) was added during the melt spinning process. It was found that the spinning speed can be increased to 400m/min with only 1 wt% PBS. The glass transition temperature of the PF/PBS as-spun fiber decreased with PBS content, and the PBS melting endotherm peak disappeared after blending with PF. Crosslinking was formed after curing, which can greatly increase strength of PF fibers. The strength of PF/PBS fiber can reach 2.01 cN/dtex, which is 30% higher than pure PF fiber.
Standardized Application and Management of a New Type of Equipment Support Resources
Authors: Wang Sen , Ruan Yongjun , Huang Xinxin
Published: October 2019

As a new type of equipment support resource, metal rubber plays an irreplaceable role in buffer damping. This paper mainly introduces the research status of metal rubber materials, and discusses the preparation process, theoretical research and performance characteristics of metal rubber. The preparation standard and management system of metal rubber products are put forward. The proposed system not only reduces the cost of equipment support resource management and production, but also has certain reference for the design, improvement and practical application of metal rubber products.
Research of diamond concentration in dicing blade effect by electroplating parameter
Authors: Zhu Xiaowei , Wang Yongbao , Liu Jianshuang , Wang Zhan , Dong Feng
Published: October 2019

In order to study the effect factors of diamond concentration in Dicing Blade prepared by composite coating method, a uniform distribution diamond composite coatings was prepared by suspension and high-low speed interval agitation method on the aluminium alloy blade hub. The effects of suspension diamond content, stirring speed, current density, surface tension and solution temperature to diamond concentration in composite coatings were studied. And the result shows the concentration of diamond in the coating is proportional to the suspending content in electroplating solution, the suspending diamond content increases, and the concentration of diamond in the coating increases until reaching a saturation value. The diamond concentration of coatings is inversely proportional to the stirring speed of sand, and obtained maximum concentrations when current density is 2.0 A/dm2 and temperature is 50°C. The surface tension has little effect to the concentration of diamond in the coating layer.
Research on green design framework and support system of metal cutting machine
Authors: Wang Xingrong , Yan Chunping , Huang Wei , Xu Jianping
Published: October 2019

In order to improve the green design level of metal cutting machine tools, the framework and implementation methods for enhancing the green performance of machine tool’s design process were studied. Analysing the environmental impact of design process, studying the green key points in the design process of materials, structures, hydraulics, lubrication and cooling, a green design framework for the metal cutting machine was established. Centering on the machine tool design process; Researching on the machine tool design support technology and implementation tools, a basic support system for green design of metal cutting machine that integrates technical support layer, interaction layer, tool support layer, technical support layer and user service layer was established. The green design support system for gear making machine was developed and applied to verify the guiding role of green framework and support system in the green design process of metal cutting machine tool.
Recycling quality evaluation of hydraulic cylinder based on residual strength analysis
Authors: Wang Guangcun , Chen Shangong , He Bing , Guo Yi
Published: October 2019

Remanufacturing is an effective way to achieve circular economy and sustainable development. Hydraulic cylinder is one of the most important executive parts of construction machinery, which has high quality, high precision and high economic value. In order to evaluate the recycling quality of hydraulic cylinder under unknown load history conditions, a remanufacturability evaluation method based on residual strength and residual life analysis was presented in this paper. Design strength, surface quality, mechanical properties including hardness, stiffness and natural frequency of hydraulic cylinder were taken into account in this model. Based on the strength characteristics change rules of hydraulic cylinder in the fatigue process, a reasonable critical threshold for remanufacturing was given. The results showed that, this model provided an intuitive way to learn about the residual strength and residual life of parts, which has a high application potential.
Prediction of processing time and energy consumption and optimization of machining parameters in gear hobbing
Authors: Huang Wei , Yan Chunping , Sun Xiao , Huang Feihu , Wang Xingrong
Published: October 2019

This paper studied the characteristics of time and energy consumption of gear hobbing in batch production of small modulus gear. A method of integrating design of experiment, response surface method and multi-objective salp swarm algorithm (DOE/RSM/MMSA) is proposed for the complex optimization of machining parameters (namely hob rotation speed, cutting feed and depth of cut) in gear hobbing process. This paper uses three-level factorial design method to design gear hobbing experiments, and carries out mathematical and statistical analysis on the experimental results. It is found that cutting feed is the most significant machining parameter followed by hob rotation speed and depth of cut to reduce processing time and energy consumption. The prediction model of processing time and energy consumption in gear hobbing process is obtained through response surface methodology. The relative error rates of the predicted value and the actual value of the processing time and energy consumption are 0.11% and 0.09% respectively, indicating the validity of the model. Multi-objective salp swarm algorithm is used to optimize the machining parameters to minimizing processing time and energy consumption. Finally, through the comparison with the existing research results, it is concluded that the optimized machining parameters have better processing effect to achieve minimized processing time and energy consumption, which shows the effectiveness and rationality of the method proposed, and provides references for the decision-making of machining parameters in workshop.
Research on Diversity Characteristics of Mimic Defense Gateway Business Environment
Authors: Yu Jun , Zhu Guangxin , Wang Lin , Xu Mingjie , Chene Haiyang
Published: October 2019

This paper introduces the security problem of SDN gateway based on software-defined network, compares the mimicry security controller model of dynamic heterogeneous redundancy, the mimicry network scheduling and security mechanism, and the advantages and disadvantages of ontology-based network mimic defense system security modeling, and introduced the future research work.
A Categorical Perceptual Study on Mandarin Tones by native Dai language speakers in Dehong Autonomous Prefecture
Authors: Lu Yao , Kong Jiangping
Published: October 2019

This paper is intended to investigate how the Dai Dialect speakers in Dehong Autonomous Prefecture perceive Mandarin tones. Therefore, identification and discrimination experiments were conducted of the four Mandarin tone continua with Dai Language speakers. The results suggested that the Dai Language speaker’s perception mode of T1-T2 and T2-T4 continua are Categorical Perception, but for T1-T3, T2-T3, T3-T4 and T1-T4 continua are not. These findings indicated that Dai language tone system does have a significant influence on participants’ perception of Mandarin tones.
Extrusion Forming Process and Microstructure of Mg-3Al-1Zn Alloy
Authors: Qian Fang , Sun Qi
Published: October 2019

In this paper, extrusion treatment of Mg-3Al-1Zn alloy treated with casting and homogenizing was carried out, the effects of extrusion temperature and extrusion ratio on the strength and ductility of the alloy were investigated, and the action mechanism was discussed. The results show that both before extrusion or after, the tensile strength of Mg-3Al-1Zn alloy after the treatment are reduced to some extent, while the elongation increases significantly. At the same extrusion ratio, when the extrusion temperature rises from 250°C to 450°C, the tensile strength of cast alloy is higher than that of uniform state. At lower temperature and larger extrusion ratio, Mg-3Al-1Zn alloy has better plasticity. With the increase of extrusion ratio, the tensile strength and elongation of Mg-3Al-1Zn alloy show a rising trend.
Periodic Vibration and Bifurcation of Vibratory Systems with Clearance Composed of Rigid Constraints
Authors: Shi Yuqing
Published: October 2019

A periodically-forced vibratory system with clearance composed of bilateral symmetric rigid constraints is considered. Distribution characteristics and bifurcation boundaries of various periodic-impact vibraitons of the vibratory system are analyzed and specified. The transition process between neighbouring fundamental impact vibrations is discussed. The induced mechanism of the two kinds of transition domains, such as hysteresis and tongue-shaped domains, and a series of singularities are revealed. Analysis results show that on the basis of the initial conditions of the system vibration or the change of excitation frequency or clearance, neighbouring fundamental impact vibrations can coexist in the hysteresis domain. Meanwhile, there exists a series of sub-harmonic impact vibrations in the tongue-shaped domain. These multi-period and multi-impact vibrations usually undergo period doubling or grazing bifurcation along with the change of excitation frequency or clearance.
Dynamic Characteristic Analysis on the Rod Fastening Rotor Bearing System
Authors: Li Yiping
Published: October 2019

Modern large-scale gas turbine’s rotor is the main form rod fastening rotor. The contact friction between wheels, the pre-tightening force of the rod and bearing system have an effect on rotor dynamics. According to the structure characteristics of rod fastening rotor, contacting model is established. In the rotor modal, contacting friction, the pre-tightening force of rod and bearing system is included to get natural frequency and the mode. Through the analysis of rotor, with increasing the pre-tightening force, the overall stiffness and natural frequency has increased. The natural frequency is increase fast when the pre-tightening force is small. With the increase of the pre-tightening force, speed of the natural frequency is slow. Bearing system with changes in speed, its oil film dynamic coefficients varieties also have some impact on the inherent characteristics of the rotor.
Economic Evaluation of Thermal Insulation Materials in the Whole Life Cycle of Enclosure Structure
Authors: Zhang Wencui , kakar Aimal khan , Yan Jingru , muhammad Ali
Published: October 2019

The thermal performance of building envelope represents a key factor to increase the energy efficiency of the construction sector and to reduce greenhouse gases emissions. This paper provide a calculation of heat losses through building envelope by using two different insulation materials (conventional and energy saving) based on the life cycle economic evaluation theory, the life cycle economic evaluation model of building envelope is established as well as calculates the life-cycle cost after using energy-saving materials on the building enclosure through analyzing the actual project. It is concluded that the application of energy-saving materials in building envelope for a span of 50years can save 910, 0000¥, which cannot only reduce the building energy consumption, but also reduces building life-cycle cost.
Design of double intelligent parking garage based on HuiYu technology
Authors: Liu Ming , Yang Qiulong , Wen Fudi , Wang Ye , Wu Mengjiang
Published: October 2019

In view of the ubiquitous parking problem in the city, a double-layer intelligent parking garage that saves space, is smart and labor-saving. On the basis of the existing parking garage, the first problem to be solved is how to effectively use the transitional parking space in the three-dimensional garage (mainly refers to the parking space that the vehicle cannot be occupied by the upper vehicle after parking). In order to solve the above problems, this paper designed a double-deck parking garage to solve this problem. Mainly by the left and right lateral movement and vertical movement of the lower parking space. All parking spaces are free to move up and down to ensure that the lower parking space can be fully loaded without affecting the upper parking vehicle. Based on Huiyu’s innovative technology, a double-layer intelligent parking garage was designed. The Huiyu model is used to complete the mechanical system design and production of physical models. The man-machine operation panel is compiled with ROBO PRO software. With button-type access, it has the function of non-slip and stable operation. At the same time, the optimal path algorithm saves time. The double-decker smart parking garage is safe, small, efficient and intelligent. It can park and pick up the car with a key. The double-deck parking garage achieves maximum use of space and is both reliable and economical. The double-deck intelligent parking garage is designed to meet the desired sporting requirements, removing the upper vehicle while ensuring that the vehicle’s bottom layer does not move. At the same time, the optimal path algorithm makes it a powerful guarantee for fast access to vehicles. The double-layer intelligent parking garage designed and built has met the design requirements. Further improvement is to transform from Huiyu model to actual product, and it is necessary to solve the problem of parking garage bearing.
Dynamic Characteristics Analysis of the Rigid Flexible Coupling Multi-body System of Wharf-cable-dynamic Positioning Vessel
Authors: Zhang Dapeng , Bai Yong , Zhu Keqiang , Liu Jian
Published: October 2019

In order to study the coupling effect of the rigid-flexible multi-body system composed of the dynamic positioning vessel, the wharf and mooring cables in mooring state, the lumped mass method was applied to discretize the mooring cables into lumped mass models for the calculation of the mooring tension of the mooring system, the nonlinear reaction force of dock fenders was simulated by Link unit in Orca Flex, and the thrust allocation of thrusters was based on PID control system. The full coupling dynamic time-frequency characteristics of the multi-body system has been analysed. The results show that the performance of the side thruster and vessel’s positioning capability can be improved effectively when the target position is selected reasonably.
The influence of different factors on acoustic emission signal in the process of monitoring steel corrosion
Authors: Shi Fengjiao , Wang Junzeng , Cui Wensheng , Qin Lei
Published: October 2019

Corrosion of steel reinforcement is one of the reasons affecting the durability of building structures. In this paper, acoustic emission technology is used to monitor the corrosion of steel reinforcement. The two influencing factors of concrete strength and water-cement ratio were compared and analyzed, and the influence of different factors on monitoring acoustic emission signal was summarized.
Modeling and Simulation of Conversion Booster Cylinder Control System
Authors: Yang Junbin , Zhou Minglian
Published: October 2019

This paper is based on the accelerated fatigue test of aviation hydraulic actuators. For the case where aviation hydraulic actuators transmission medium is different from the testing rig transmission medium, a new type of conversion booster cylinder is designed. This conversion booster cylinder set pressurization, medium conversion, pumping aviation oil as one, and laid the foundation for the pressure pulse fatigue test of aviation hydraulic actuator cylinders. Combined with the principle of valve-controlled asymmetric cylinder, a mathematical model of the control system of the pressurized cylinder was established using the method of parameter weighted averaging to unify the models in both directions. Simulink software is used to simulate the system, and the required time domain and frequency domain performance indexes are obtained. The working condition of confining pressure is simulated and the effectiveness of the design of the conversion booster cylinder is proved.
Effect of interlayer material on microstructure and mechanical properties of diffusion brazd IC10 superalloy
Authors: Li Qi , Liu Fengmei , Yue Xiong , Xiong Ming , Qin Hongbo
Published: October 2019

The diffusion brazd test of IC10 superalloy was carried out by using Russia solder M3 interlayer powder. The wetting quality of the high-temperature alloy was evaluated by the contact angle of wetting at various temperatures. The mechanical properties of the joints were determined at operating temperatures. The result shows that at the temperature of 1250°C, the contact angles of interlayer powder M3 alloy do not exceed 4∼5°, it has high wettability and spread ability over the surface of the IC10 alloy. The average test time before failure at the temperature of 900° and the stress of 320 MPa was 38 hours, and at the stress of 350 MPa was 9.6 hours, all both higher than 80% of the base material under the same experimental conditions. The structure of the joints has a smooth transition from the base metal to the soldered joint. In the structure of the joint, the γ’- phase with a large volume concentration in the base metal. IC10 superalloy has excellent high temperature properties when the M3 interlayer was used.
Research on design method of time-varying uncertainty of bolted connections
Authors: Zhao Yongsheng , Fu Huirong , Wang Lixia , Wu Hongchao , Li Shunlei
Published: October 2019

For the change of uncertainty caused by the influence of time on the bolt connection during use, this paper is based on a time-varying uncertainty design method for several parameters that change with time. The method consists of stochastic differential equations. The bolt-on time-varying design combines mathematical models of the distribution parameters of multivariate random variables. The design method of bolting connection with uncertainties of various influencing factors with time is proposed, and the time-varying design of tightly connected bolts subjected to axial working load is taken as an example. The method considers the dynamic changes of the stress and the allowable stress of the bolted joint, so that the safety of the bolted product is more accurately evaluated for dynamic reliability. Through this method, combined with the set initial values of the parameters and the historical data obtained by the test, the reliability of a certain time can be calculated. The design of the example uses Matlab to simulate the data, and the reliability of the specified time is obtained, which is the test of the bolting result. And assessment provides an important reference.
Simulation analysis of control system for six degrees of freedom damping platform based on MATLAB
Authors: Su Zhaobin , Li Wenjin , Xie Wenbin
Published: October 2019

On the basis of relevant mathematical theory inference and the observability analysis of sensor arrangement and the controllability analysis of actuator arrangement, the simplified model of the six-degree-of-freedom air spring active vibration isolation system is established. Considering the structure of the air spring damping platform and the environment interference around the vibration isolation platform, we use the simulation software named MATLAB to establish three control models: PID control, Fuzzy control and Fuzzy PID control. The simulation analysis results show that the Fuzzy PID control consequent is obviously benefit to the damping platform, in addition, the composite feedback can also greatly promote the control consequent.
The design of marine hydraulic oil detection and purification system
Authors: Sang Yijian , Zhu Faxin , Wang Weijun , Peng Xuegao , Li Yvle , Luan Jin , Ma Yonggang
Published: October 2019

In this text, hydraulic oil is the research object. Aimed at improving the problems and shortcomings of present hydraulic oil detection and purification. By looking up for relevant information, and used Auto CAD to design working principle and main components. Finally, arguments the feasibility of the hydraulic oil detection and purification system from the aspects of technology, structure, operation and economy. The results show the system realizes the integration of hydraulic oil detection and purification, simplifies the operating steps, saves manpower and materials, and avoids the secondary pollution of hydraulic oil.
Design of a special tool for dismantling and fitting of the lead sleeve in marine fuel injection pump
Authors: Ma Yonggang , Fang Suyi , Zhu Faxin , Peng Xuegao , Ji Shilin , Huang Jinjie , Luan Jin , Wei Hu
Published: October 2019

The existing dismantling and fitting tool of the lead sleeve in fuel injection pump in the laboratory is taken as the research object, aiming at its shortcomings or problems like the limited scope of application, the laborious operation, the hidden danger of personnel injury and so on. Starting from the design requirements of the special tool for the dismantling and fitting of the lead sleeve in the marine fuel injection pump, a special tool for disassembling and assembling of the lead sleeve of the injection pump is designed by using the graphic design software AutoCAD2014, and the working principle and the main components of the tool are introduced. Finally, from the aspects of technique, operation, maintenance, economy and so on, the feasibility of the special tool for the dismantling and fitting of the lead sleeve in the fuel injection pump was taken analyzed.
Research on simple test and adjustment method of vehicle comfort
Authors: Wang Junfeng , He Liyuan , Yang Chenghui
Published: October 2019

This paper analyzes an application in the field of automobile manufacturing, and makes a more in-depth study on the test and control methods of vehicle comfort, focusing on the mechanical movement of the vehicle in the vertical direction and the pitching motion around the horizontal axis. Analyze and adjust the comfort of the vehicle through an adaptive adjustment system.
A Visual Detection and Location Method for Soft Fabrics
Authors: Gao Qiang , Li Zhen , Pan Jun
Published: October 2019

The soft fabric is prone to burr, fold, enfold and blur, which poses a great challenge to the accuracy of visual edge detection and localization of the autonomous loading and unloading material system of garment robot. In order to overcome the above problems, it proposes an adaptive edge localization method based on double filtering in this paper, which can be used to guide the garment robot to achieve grasping of soft fabric automatically. Firstly, the Gauss filtering and morphological filtering are used to smooth the image, and then it calculates the canny adaptive threshold based on the edge gradient information and detect the edge, finally it locates the coordinates of edge feature extracted. The experiment results show that the method is effective accuracy greater than 96%and robust tested on the real data sets composed of soft fabric. The method has good application value for the autonomous loading and unloading operation of the garment robot and has positive significance for the construction of the intelligent garment factory.
Analysis on the Application of Modern Building Exterior Wall Materials in Interior Design
Authors: Ye Wujun
Published: October 2019

Analyze materials from the perspective of the application of new modern building exterior wall materials, especially the technical value and aesthetic value of plastic materials and ceramic tile materials applications, as well as the close connection between materials, technology and art in interior design. Interior design is a comprehensive project that combines technology and art, not only requires a standard design implementation process, but also the pursuit of creative and imaginative design concepts and connotations. Because materials are the only medium, interior design materials that combine design techniques and design art are used to support design. The development of new materials is not only a huge advancement in the use of materials, but also promotes the innovation of interior design, and promotes the advancement of ideas and technology.
Public Security Command and Warfare System Based on Bei-Dou Positioning Service
Authors: Cheng Weiwei , Shan Kunyang , Liu Guicheng , Yang Xingchao
Published: October 2019

Facing the increasingly serious anti-terrorism situation and the need to maintain public security, and breaking through the shortcomings of the traditional flat command operation mode, we designed a set of Bei-Dou location service as the core, integrating existing network resources, IT infrastructure and video surveillance infrastructure. An all-round, multi-level public security command and combat system integrated with the investigation and command business needs. The design and application of the system start from four different angles. Firstly, the main contents of the system construction are introduced theoretically. Then the function design of the software is described in detail. Finally, the application of Bei-Dou system and 5G communication in the single-handle handheld terminal is expounded. Scenes. The system integrates functions of information collection, command and dispatch, tracking and monitoring, and multi-level linkage. It introduces data large screen and 5G communication technology, enhances the big data visualization function of the command system and the stability of the communication link, and can modernize the national defense. Construction provides technical support and platform support.
Variable sampling processing and frequency domain analysis of sound signals
Authors: Zhu Yifei
Published: October 2019

This paper describes the transition from analog to digital signals, and the relationship between the angular frequency of continuous-time signals and the digital angular frequency of discrete-time signals. In this paper, the frequency domain expression of the signal after the upper sampling (interpolation) and down sampling (decimation) of the digital signal is strictly derived theoretically. In the frequency domain, the spectrum of the L-sampled signal can be obtained by shrinking the original signal spectrum by L times, the amplitude is constant, and the image frequency is generated within the original period length. Under the premise that no signal distortion occurs under M times, the frequency domain is widened by M times relative to the original signal frequency domain, and the amplitude changes nonlinearly. In this paper, MATLAB is used to perform up-and down-sampling and distortion processing on sound signals to verify the correctness of theoretical frequency domain changes.
Research on Task Assignment Model and Algorithm of Online Picking System Based on Multi-objective
Authors: Zhang Jianyun , Wang Zhuan , Xiao Xiang
Published: October 2019

In view of the task assignment problem of the picking station in the online Parts-to-Picker Picking System, a mathematical model was established that targeting the minimum number of total rounds of the bins and the equalization of the picking of each station, constrained by the uniqueness of the order attribution and the maximum amount of orders processed by the workstation. Then, the solution flow and method of multi-objective function problem based on Genetic Algorithm are designed. The algorithm constrains the secondary objective function and defines the rules of the objective function constraint. Finally, an empirical study on the actual Parts-to-Picker System of an e-commerce enterprise is carried out. The results show that the algorithm can effectively reduce the two objective function values and verify the effectiveness of the algorithm.
Dynamic characteristic analysis of a high-speed small piezoelectric turntable
Authors: Xue Shan , Guo Jianbo , Liu Zhengbin , Li Guangqing , Lv Qiongying
Published: October 2019

Fast motion of piezoelectric turntable is an important guarantee for fast target locking and tracking of imaging system. Vibration of piezoelectric turntable in fast motion will seriously affect imaging quality and even damage imaging system. Therefore, the three-dimensional model of high-speed small piezoelectric turntable is built by SolidWorks software, and the finite element model is established by ANSYS software to analyze the dynamic characteristics of the piezoelectric turntable. The natural frequencies and modal modes of the turntable are obtained by modal analysis. On this basis, the harmonic response analysis is carried out, and the amplitude-frequency characteristic curve of the piezoelectric platform is obtained. The analysis results show that the dynamic characteristics of the designed high-speed small piezoelectric turntable meet the design requirements, and there will be no resonance.
Research on Evaluation Methods of Firing Precision of Trajectory Correction Projectile
Authors: Song Xieen , Gao Min , Wang Yi , Wu Hanzhou , Cui Xinhan
Published: October 2019

As a new type of ammunition, the trajectory correction projectile has much different ballistic characteristics than traditional uncontrolled ammunition and missile. The firing precision of trajectory correction projectile is significantly higher than that of uncontrolled projectile and lower than missile. Also the evaluation method for firing precision is different from that of uncontrolled projectile and missile. In this paper, by analyzing the calculation methods and characteristics of different firing precision evaluation indicators, the method suitable for evaluating the precision of trajectory correction projectile is determined, which provides theoretical and technical support for acceptance of trajectory correction projectile firing precision.
Accuracy Analysis of Aerodynamic Calculation of Twodimensional Ballistic correction Projectile based on Missile Datcom
Authors: Wu Hanzhou , Gao Min , Song Weidong , Jie Zhao , Wang Yi
Published: October 2019

Missile Datcom (hereinafter referred to as Datcom) is an aerodynamic engineering calculation software developed by the US Air Force Research Laboratory. It is commonly used in the preliminary design of the shape scheme of missiles, aircraft and other aircraft. In this paper, Datcom is used to calculate the aerodynamic parameters of a two-dimensional ballistic correction projectile(D2BCP), and the calculated data is compared with the wind tunnel test data. The analysis results show that Datcom calculates the axial force coefficient (CA) of the projectile with large system deviation, however, the deviation can be eliminated by a certain compensation, thereby obtaining a more accurate CA of the projectile. Datcom calculates the normal force coefficient (CN) with high Mach number accuracy, but there is an unacceptable deviation of the projectile CN calculated at small angle of attack ( α ). The calculation of pitching moment coefficient with α (CMa) is higher, but the error is larger under individual Mach numbers.
SKNN Algorithm for Filling Missing Oil Data Based on KNN
Authors: Wang Mei , Li Dong , Qi Kaiyuan , Xue Chenglong , Yang Erlong
Published: October 2019

Along with the rapid development of science and technology information in contemporary society, massive data has become a common phenomenon in information processing in various industries, and various data quality problems have also followed. Among them, data loss is a common problem. In the process of oilfield production, the dynamic data of production wells is increasing continuously every day, and data missing problems often occur. Aiming at the missing data, this paper proposes an improved data filling algorithm SKNN based on KNN. Based on the KNN algorithm, the algorithm uses the SMOTE algorithm to randomly generate the fill data range, and uses the multi-filling idea to find the weighted average as the fill data. The experiment with the production data of a well area in Daqing oilfield as the sample set verified that the SKNN algorithm could not only fill the data, but also improve the accuracy.
A Novel Anti-skid Capability Testing Device for Port Rail-mounted Equipment: Mathematical Modeling and Experimental Investigation
Authors: Wang Gongxian , Tang Qilin , Hu Zhihui , Hu Chenzhang , Li Yongzhi , Zhang Yang
Published: October 2019

Regarding to the lack of the effective method and equipment to test the anti-skid capability of port rail-mounted equipment along the rail. A novel anti-skid capability testing device (named as WACD) for port rail-mounted equipment is proposed in this paper. The mechanical model of the WACD is established to predict the maximum anti-skid capacity of the tested port rail-mounted equipment and analyze its working principle. After that, the experimental tests are carried out to verify the effectiveness and feasibility of the WACD. The test results confirm that the designed principle of the WACD is correct, and the testing device can be used to testing the anti-skid performance of the port rail-mounted equipment under the wind speed of 70 m/s.
Study on optimization of PES/CaCO3 composite powder for selective laser sintering (SLS) 3D printing technology
Authors: Nguyen Huu Chinh , Guo Yanling , Nguyen Tat Thang , Yu Yueqiang
Published: October 2019

In this study, a new type of friendly environment material including polyether sulphone resin powder (PES), and limestone flour (CaCO3) (referred to as CO-PES-CaC) has been developed for selective laser sintering (SLS) additive manufacturing that is low cost, environmentally friendly and energy efficient. The aims of this study were to optimization of PES/CaCO3 composite powder for SLS printing technology. The mechanical properties and microstructure of CO-PES-CaC affected by different the ratio of PES powder and CaCO3 powder has been studied. The experimental results indicate that the CO-PES-CaC quality was optimum when the ratio of PES powder and CaCO3 powder was 75/25. The mechanical properties peak at 8.09 MPa for tensile strength and 15.28 MPa for flexural strength, and 3.91 kJ/m2 for impact strength.
Research on mixture of PES/CaCO3 as 3D printing materials in restoring ancient architectural works in Vietnam
Authors: Nguyen Huu Chinh , Guo Yanling , Nguyen Tat Thang , Yu Yueqiang
Published: October 2019

In this study, we have used selective laser sintering (SLS) 3D printing technology with printing material is a mixture of Polyether sulphone resin (PES)/CaCO3 powder to recover the stylized dragon, lion, phoenix motifs and ancient works in Vietnam. The experiment has created a 3D product of lion mascot, with the result of mechanical properties tensile strength, flexural strength and impact strength average values, which are 8.08 MPa, 15.28 MPa and 3.09 KJ/m2, respectively. Experimental results show that the mixture of PES / CaCO3 powder is suitable for 3D printing materials in recovering the details and ancient works in Vietnam.
Transmission Characteristics Of T-Typed Photonic Crystals Waveguide Based on Two-Dimensional Al2O3 Ceramic Rods Array
Authors: Yang Yan , Wang Yong , Xu Biaogang , He Jie
Published: October 2019

This paper proposed and validates a T-typed photonic crystals waveguide in X-band consisting of Al2O3 ceramic rods array. Based on the numerical simulations on the band gap of the photonic crystals and the function of the waveguide, the corresponding experiments are performed, which are matched well with the numerical results. The measured transmission characteristics of the photonic crystals waveguide show a wide bandwidth between 8.56 and 11.98 GHz (relative bandwidth is 34.2%). The wideband and easy integration mean that the designed photonic crystals waveguide has potential applications in the large. scale integrated system and communication systems.
Tribological behaviour of Al-8.42Fe-1.29V-1.93Si/SiCp composites under dry sliding conditions
Authors: Huang Shaoxiong , Teng Jie , Jiang Fulin , Fu Dingfa , Zhang Hui
Published: October 2019

The tribological behavior of Al-8.42Fe-1.29V-1.93Si/SiCp composites was investigated using a ball-on-disc tribometer under dry sliding conditions. The coefficient of friction (COF) and the wear rate of the composites were evaluated over a load range of 2 – 25 N with sliding speed from 800 to 1600 rpm. Scanning Electron Microscopy (SEM) was utilized to examine worn surfaces and wear debris to reveal the wear mechanism. The results showed that the increase of sliding speed and load led to the decrease of average COF. The wear rate was mainly affected and was positively correlated with the applied load. Abrasive wear and oxidative wear were the dominant wear mechanisms at low loads, while the primary mode of wear mechanism transformed from adhesive wear at medium loads to severe delamination wear at high loads.
Design and implementation of a wearable exoskeleton system for lower limbs
Authors: Ye Junyang
Published: October 2019

Exoskeleton is a kind of wearable mechanical device. It combines the intelligence of human beings with the “physical strength” of robots, and the robots is controlled by human intelligence in this device, then some assignments that could not be accomplished by human alone are achieved by the robots. The lower limbs walking exoskeleton, a human-machine integrated device falls in between the human and the biped robots, could help people walk around. Because decisions could made by people in this device, the gait planning and gait balance during walking become more simple compared with the bipedal walking robots, the structure design is more convenient, and at the same time, the walking ability of the human body can be greatly enhanced, and the range of activities could be enlarged. In this project, a new type of wearable lower limb walking exoskeleton mechanism was designed by using electric system based on the in-depth study of the movement mechanism of human lower limbs musculoskeletal groups. Moreover, a prototype test system for the lower limbs walking exoskeleton was developed on the basis of theoretical research, including the processing and assembly of the mechanical structure, and the concrete realization of the software controlled framework. This prototype test system could serve as the experimental platform for further studied in the future. The ultimate goal of this project is to achieve a walking exoskeleton that has comfortable wearing and stable walking, reduce the energy consumption during walking, reduce the feeling of fatigue, and improve the speed of body weight-bearing exercise. This robot will greatly reduce the load that the heavy object brings to the muscles, and the servo motor will bear the main weight. This can greatly reduce the physical exhaustion of occupational groups mentioned as above and increase the duration of work, so as to bring qualitative changes in work efficiency and effectiveness.
The Research of Computational Method by Using Beam Element for Rope Structure
Authors: He Xuguang , Liang Lin
Published: October 2019

On the basis of in-depth study of mechanical behavior of rope, according to the catenary theory the equation of guy rope is built. Based on this equation, the guy rope is established in FEM which is analogized by using beam elements with little bending stiffness, and non-linear finite element calculations are applied for the guy rope. Take the theoretical shape of guy rope as study point, according to example calculations, computational accuracy about using beam element to simulate is quantificationally analyzed, and discipline curve of flexural rigidity to computational result is obtained and the results is also analyzed.
Research on Reliability Evaluation of Engine Crankshaft Flexible Production Line Based on AHP Fuzzy Comprehensive Evaluation Method
Authors: Fan Jinwei , Wang Miaomiao , Li Zhongsheng , Li Weihua , Zhang Yiling , Wang Peitong , Ma Ning , Yin Jian
Published: October 2019

According to the reliability evaluation system of production line and the Petri net model of production line availability, the relationship between reliability index and reliability index correlation is analyzed by statistically calculating reliability data. According to the relationship between the actual production situation and the correlation between the reliability index and the reliability index, the analytic hierarchy process based on interval judgment is used to give the weight of each reliability indicator to the reliability of the production line, and according to the reliability index The membership function of the evaluation grade is evaluated by the fuzzy comprehensive evaluation method for the reliability of the engine crankshaft flexible production line.
Study on Dynamic Control Model of Assembly Construction Cost Based on Piecewise Regression Analysis
Authors: Zhang XiaoSeng
Published: October 2019

Assembly building is still immature, resulting in the higher prefabrication rate of PC components, the higher the cost of assembly building. In order to improve the cost control ability of assembly building, a dynamic cost control model of assembly building based on piecewise regression analysis is proposed. A multiparameter constrained cost control model with quality, efficiency and cost as the control object is obtained by constructing the mathematical model of control. The statistical parameters of characteristic information of assembly building consumption are analyzed, and the dynamic explanatory variable of assembly building cost is analyzed by descriptive statistical analysis method, and the piecewise regression analysis method is used. The cost control test of assembling building is carried out, the prediction model of building cost is established, the panel data analysis of building cost is carried out by combining the correlation analysis and regression analysis method, and the cost dynamic control of assembling building is carried out by using the piecewise statistical method. The simulation results show that the cost prediction of prefabricated construction cost by this method is accurate, the control convergence is good, the global optimization ability of dynamic control of construction cost is strong, and the cost of engineering cost is effectively reduced. Improve the efficiency and quality of construction.
On the Surface Texture Effect of Ceramic Materials
Authors: Shao Weiwei
Published: October 2019

The surface texture of art ceramics gives pottery vitality and vitality. The ever-changing textures and colorful shapes make pottery products rich in artistic expression tension. Different textures are used to form various kinds of texture beauty, which is indispensable for art ceramics. Performance techniques. From the relationship between texture changes and ceramic modeling, the paper elaborates on various aspects of texture performance and decorative aesthetics by using different textures of texture materials and treatment methods, and the art of applying texture process and different angles. The effect is summarized and summarized, which has certain theoretical and practical significance.
An Autonomous Robotic Alignment Strategy Based on Visual Gudiance
Authors: Zhang Chi , Pu Jiexin , Niu Xinyue
Published: October 2019

Aiming at the problem that the intelligent level of solid rocket motor production line depends on manual alignment is low, a control strategy of robot automatic alignment based on monocular vision guidance is proposed. Accurate position measurement is realized by monocular vision; the mapping relationship between vision space and robot space is obtained by hand-eye calibration technology; the motion path of the robot is planned by the probabilistic roadmap method, and the assembly process is optimized by using the results of visual feedback; finally, the alignment process is visualized by simulation. Experiments and results demonstrate the effectiveness of the proposed strategy, which can achieve high-precision positioning, visual detection, path planning and path adjustment. It can meet the accuracy requirements of the robot automatic alignment operation and complete the whole process automatically.