bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
Design of Sliding Mode Controller for Tilting Quadrotor UAV Based on Predetermined Performance
Authors: Zhou Wen , Wang Xiaoping , Wang Xiaoguang , Wang Wenhua , Liu Bo 
Published: January 2021

Abstract
Aiming at the influence of modeling error and uncertain interference such as external sidewind in the control system of tilting quadrotor UAV, a non-singular fast terminal sliding mode controller based on predetermined performance is designed for its vertical take-off and landing mode. Firstly, based on the classical mechanics theory, the nonlinear dynamics model of tilt-rotor UAV in vertical take-off and landing mode was established. Then, on the basis of the non-singular fast terminal sliding mode controller, the predetermined performance function was introduced to make the system error within the specified performance range, and the final bounded convergence of the tracking error in the closed-loop system was proved based on the Lyapunov stability theory. Finally, the simulation experiment was carried out in MATLAB/Simulink. The simulation results show that the designed method can still achieve the stable tracking of the predetermined trajectory under the circumstance of uncertain external interference, and it has good control performance and anti-interference ability.
Human Motion State Recognition Based on Multi-input ConvLSTM
Authors: Yiming Zhang , Liuai Wu 
Published: January 2021

Abstract
The human body generates acceleration signals during movement. After collecting and processing this signal, the movement state of the human body can be analyzed and the behavior of the human body can be judged. Human motion state recognition has a wide range of applications in fields such as health monitoring, somatosensory games, and user social behavior analysis. In this paper, the UCI data set collected by mobile phone sensors is used to build the model using convolutional long and short-term memory neural network (ConvLSTM) combined with multi-input CNN (Multi-head CNN), and combined with long and short-term memory neural network (LSTM) and convolutional memory Neural network (ConvLSTM) for comparative evaluation. The accuracy of the model in this paper reached 93.75%. Experimental results show that the new algorithm can more accurately classify and recognize the human motion state.
A Simulation Study on the Reentrant Waves in the Pacing Ventricular Tissues
Authors: Zhang Yue , Shi Xibo , Sui Dong 
Published: January 2021

Abstract
The aim of the study is to investigate the relationship between the reentrant waves and I
K1, and probe the effect of I
K1 on the reentrant waves. Firstly, based on the TNNP06 model, the single pacing cell is derived by depressing I
K1. And then, a 400 cells ×400 cells 2D tissue is developed by coupling the pacing cells together. Thirdly, the S1-S2 protocol is applied to inspire the reentrant waves. Next, the processes of the reentrant waves in the tissue corresponding to different I
K1 are analysed. In addition, the action potentials of the cells in special locations are recorded and discussed. With the decrease of the I
K1, the reentrant waves spin slowly and the period of reentrant waves increases. Meanwhile, the range of the action potential of the cells becomes larger when I
K1 becomes smaller. The results suggest that with the decrease of I
K1, the reentrant wave is weakened, and the systolic and diastolic functions of the tissue are enhanced at the same time.
High precision on-line liquid level detection system based on microwave penetration method
Authors: Wang Hui , Meng Fanmeng , Xu Changbin , Xu Lenian 
Published: January 2021

Abstract
In order to meet the high precision and low cost of liquid level detection for bottled drinks in industrial production line, based on microwave transmission principle a liquid level detection method was designed on the basis of radar level meter. The rectangular microstrip antenna sent and received specific microwave signals. The signal was processed by the embedded ARM(Advanced RISC Machines) processor and digital signal processing method, and finally the data was transmitted. It was verified by experiments that the microwave penetration method can be used for liquid level detection, and the detection accuracy can reach ±1mm. Due to the use of microwave for measurement, the system has high stability and can be applied to the liquid level detection of bottled drinks on the production line.
Numerical method in riemann invariant form for a submerged bar breakwater model
Authors: Magdalena I , Rif’atin H Q , Kristianto I J 
Published: January 2021

Abstract
Recently, Geotextiles are widely used for coastal protection in Indonesia. Geotextile is one of the implementations of a submerged bar as a breakwater. Here, we will study the damping mechanism of the Geotextile to reduce the incoming wave amplitudes through a mathematical model. The model that we use based on the Shallow Water Equations. Analytical solutions for wave transmission coefficient are derived using the Separation of Variables Method. Numerically, we construct a scheme using the Riemann Invariant Method to approximate the analytical model. For validation, the numerical results are compared against the analytical wave transmission coefficient, which resulted in a very good agreement between the two findings. Further, we investigate the effect of the changes in the dimension of a submerged bar to the reduction of the transmitted wave amplitude.