bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of real-time prediction module for precision and error of CNC system finishing
Authors: Lei Liang , Zhang Ning , Cai Peng 
Published: August 2020

Abstract
High speed and high precision are the important trends in the development of CNC machine tools. In order to improve the machining accuracy of CNC machine tools, the errors of CNC machine tools must be reduced as much as possible. Generally speaking, the errors of CNC machine tools include spatial errors, thermal errors, cutting force errors, tool wear errors, etc., in which spatial errors account for a large part of CNC machine tool errors, so reasonable control of reducing spatial errors is of great significance to improve the accuracy of CNC machine tools. Methods commonly used to reduce spatial errors include error prevention methods and error compensation methods. Error prevention is a method to eliminate and reduce error sources through design, manufacturing, assembly, etc. Although this method can reduce the original error, it is limited by improving manufacturing and assembly accuracy to reduce errors, and it is economically expensive. The error compensation method is to artificially create a new error to offset the current original error to achieve the purpose of improving machining accuracy. This method is easy to implement and has low cost. Therefore, the error compensation method is the most economical and effective method to improve the accuracy of the machine tool.
Design and implementation of temperature and humidity monitoring system for small cold storage of fruit and vegetable based on Arduino
Authors: Tang Xiuying , Tan Chao , Chen Aibin , Li Zhenghong , Shuai Renzheng 
Published: August 2020

Abstract
At present, the utilization rate of small cold storage for fruit and vegetable in Yunnan is low, and it is necessary to carry out regional management of cold storage in order to save energy and improve the utilization rate. Because different fruits and vegetables need different refrigeration temperatures, so real-time temperature and humidity monitoring is particularly important. For meeting this requirement, this paper designs an arduino-based temperature and humidity monitoring system for small cold storage of fruit and vegetable. The system mainly includes hardware and software parts. Handware component includes Arduino Mega2560, ESP8266, Zigbee, DHT11 temperature and humidity sensor, and OLED display and the software component includes the Arduino IDE, UartAssist serial debugging assistant, Lighting. Blinker. Finally, the whole system is tested, and the test results show that the system has the characteristics of remote viewing, high measuring accuracy and convenient use, and the system could meet the needs of temperature and humidity management for small cold storage.
Hybrid Position/Force Control with Virtual Impedance Model of Robot Manipulators
Authors: Hu Guanhua , Huang Qingjiu , Hanafusa Takuya 
Published: August 2020

Abstract
Industrial robots require force control in applications such as grinding, and impedance control is a representative method of force control. However, the current impedance control has no clear solution to the hybrid control of position and force for robot manipulators. Therefore, this paper distinguished the position control and force control of the top of robot according to the axis, converted the desired force to position compensation based on the kinematics and dynamics of the robot, and proposed a hybrid position/force control with virtual impedance model of robot manipulators. Moreover, this paper established a grinding simulation model of a three-joint robot manipulator on Matlab/Simulink, and verified the effectiveness of the control method proposed in this paper by a numerical analysis of grinding simulation.
Road elevation map estimation based on affine transformation and stereo matching
Authors: Feng Y H , Zhang R H , Zhai S 
Published: August 2020

Abstract
This paper presents a road elevation map estimation method based on affine transformation. A geometric model of reference plane and stereo rig is proposed. The model showed that the height of 3-D points relative to the reference plane can be described by the proposed disparity relative to the reference plane. The reference plane is implicitly established by performing an affine transformation on target image. A local based stereo matching is applied to estimate subpixel disparity map. The elevation map can be easily estimated from subpixel disparity map using proposed elevation computation model. The experimental results on real-word road scenes show that the proposed method can provide accurate road elevation estimation.
Low-cost Detection of Surface Defects on Ultra-smooth Optical Substrates
Authors: Chen Shiyi , Nie Xiaoming , Tan Zhongqi , Zhang Bin 
Published: August 2020

Abstract
In order to better measure the surface processing quality of ultra-smooth optical substrates, an image acquisition system of laser scattering microscope is built based on the principle of microscopic dark-field scattering imaging, which can help acquire a substrate sample scattering image within 10 seconds. Various kinds of defects on the surface of the optical substrates can be observed, and in this way, the simple and qualitative analysis of the surface quality of the substrates is realized.
Simulation Research on Decoupling Control of Active-disturbance-rejection of Omnidirectional Robot
Authors: Shen T , Xie X Y , Li J Y , Dong X B , Gao X H 
Published: August 2020

Abstract
Active-disturbance-rejection controlling method is proposed in this essay aiming at the problems of omnidirectional robots, such as complex model, strong coupling and controlling difficulty caused by internal and external stochastic disturbance. Taking eight-wheel omnidirectional robots as the example, the coupling method based on active-disturbance-rejection is designed by analysing the kinematic-dynamic model of the robot. Non-linear function is used as the state feedback of the components of the active-disturbance rejection controller, and extended state observe is adopted to estimate the internal and external stochastic disturbances and to provide active disturbance compensation. Through simulation experiment comparing with traditional PID controller, the decoupled active-disturbance-rejection controller can control omnidirectional robots better inhibit the unknown disturbance and improve the performance of the system.
Reform of mechanical manufacturing experiment teaching based on Excellence in Engineer Program
Authors: Liang Yanmei , Zhao Rui , Bao Jiading 
Published: August 2020

Abstract
This paper will expound the new demand of talent training based on Excellent engineer education and the significance of experimental teaching, as well as analyze the current situation of experimental teaching. Then, the reform countermeasures of mechanical manufacturing experimental teaching based on “Excellent Engineer Education” have been put forward, so as to provide reliable reference for relevant teachers.
Design of dual band common aperture continuous zoom optical system
Authors: Jia Bing , Zhao Yuchen , Yuan Xie 
Published: August 2020

Abstract
To rapidly accommodate social demands and the requirements of imaging system under increasingly complex application environment, and to optimize the complex and bulky existing multi-spectrum continuous zoom optical systems, a short-wave(0.9μm to 1.7μm) and long-wave(7.7μm to 9.3μm) infrared radiation common aperture continuous zoom optical system was designed, the focal lengths of short-wave and long-wave infrared radiation were 8mm to 32mm and 30mm to 120mm respectively, the zoom ratio was 4.The system was analysed according to the theory of positive group compensated zoom, powers of the zoom group and the compensation group were well matched, only ZNSE and ZNS materials were applied in the common group. The results of the experiment show that the optical system is compact in structure, and has good image quality in different spectrums, can work around the clock under complex environment.
Research on Erection System of a Vehicle Missile
Authors: Yang Minbo , Ji Yueyue , Ma Cong , Wu Qipeng 
Published: August 2020

Abstract
The defects of existing erection system of a vehicle missile mainly include long erection time, large volume and poor adaptability to harsh environmental condition, so a new type of gas-fired electric erection system is designed. After the structure and working principle are introduced, the similar model of a missile is established according to the similarity theory. Through the analysis of the working process of the system, the mathematical model is established and the simulation model is also established by using Matlab / Simulink. Finally, the simulation analysis is carried out. The result shows that the erection system can achieve the quick erection of a heavy vehicle missile, which lays the foundation for the subsequent engineering application.
Construction of hydraulic chuck reliability test platform by ARM DSP dual-core system
Authors: Liu Haitao , Du Hubing , Wang Jianhua 
Published: August 2020

Abstract
To improve the data acquisition speed and accuracy of hydraulic chuck reliability test, a dual-core data acquisition system with ARM and DSP is constructed in combination with their respective characteristics. Taking full advantage of DSP’s fast operation speed, arm is suitable for interface, control and display, so as to realize high-speed and high-precision data acquisition and real-time online data processing, as well as various real-time data acquisition and information exchange functions.
Research on Transmission Performance of A Seven-gear Three-degree-of-freedom Planetary Gear Automatic Transmission Based on Graph Theory and Matrix Equation
Authors: Fan Yi 
Published: August 2020

Abstract
The transmission performance analysis of planetary gear automatic transmission is helpful for the following structural size optimization, hydraulic design and electric control design. The current graphic method has the disadvantages of low calculation accuracy and lack of intuition in numerical analysis method. This paper proposes a method to analyze the transmission performance based on graph theory and matrix equation. Firstly, a graph theory analysis model is established for the self-designed seven-gear three-degree-of-freedom planetary gear automatic transmission, and the structural characteristics of the transmission are analyzed. Then, on the basis of analyzing the shift actuator worksheet, the motion analysis model and torque analysis model of typical gears are designed by taking the first gear and the reverse gear as examples, and the speed and torque values of all gears of the transmission are calculated by using the corresponding matrix equation. Finally, the power flow diagram of the typical gear is established by taking the first gear and the fourth gear as examples, and the direction and numerical value of power flow are identified on the diagram. The results show that the method can realize the combination of qualitative and quantitative analysis for the transmission performance analysis of the planetary gear automatic transmission with multiple gears and multiple degrees of freedom, which is more intuitive, accurate and efficient.
Motion Simulation of Bionic Hexapod Robot Based on ADAMS/MATLAB Co-simulation
Authors: Liu Tao , Zhang Zhipeng , Liu Yiqun , Fan Xuanxia 
Published: August 2020

Abstract
This paper mainly studies the kinematic simulation of hexapod robot when going straight, turning and climbing stairs based on MATLAB and ADAMS. First, the kinematic model of the robot was established based on the D-H method. On this basis, the compound cycloid and half-wave sine function were used to plan the foot trajectory of the robot during straight and turning. Through ADAMS/ MATLAB co-simulation, the hexapod robot has completed the tasks of straight, turning and climbing the stepped terrain. The simulation results show that the planned gait can be more flexible to complete the turning and climbing the stepped ground, and the related results can help the small hexapod robot to quickly verify the gait algorithm and reduce the design development cycle.
Design & Simulation of a Superimposed Hydraulic Back Pressure Valve with Adaptive Back Pressure
Authors: Mao Xuyao , Ding Hongyuan , Li Bin , Wu Chao , Wang Nei 
Published: August 2020

Abstract
A superimposed hydraulic back pressure valve with adaptive back pressure was designed. The back pressure of the valve changes as the diving depth of underwater vehicles changes, and is always higher than outboard environmental pressure by an adjustable value, preferred 0.5MPa, to avoid leakage of environmental medium to the inboard hydraulic system. The valve was designed in a pilot-operated style with a flat valve port of main valve. Variable damping plugs were used to easily regulate the dynamic performance of the valve. And an isolation device was adopted to isolate the contact between the inboard and outboard media. The static mathematic models of the valve were established and simulations were carried out. The simulation results show the valve has good pressure stability and flow adaptability, and its back pressure changes with the change of outboard pressure well.
Research on Modeling of Satellite On-orbit Operation Procedure
Authors: Lv Wei , He Xiaoyu , Qin Wei 
Published: August 2020

Abstract
Aiming at the demand of the TT&C system for the on-orbit satellite to automatically perform various operations, the paper proposes a modeling technology for on-orbit operation procedures. Based on the formal method, a grammer specification of operating rules is formulated, and modeling rules of operating rules are defined by XML Schema. The process of graphical editing, serialization and deserialization of operating rules is presented. Practical application shows that it can improve the design and execution efficiency of operating procedures.
System and Design of a AGV for Flexible Production Line
Authors: Xu Shuyang , Cao Shukun , Gao Kuizeng , Cao Wenlong 
Published: August 2020

Abstract
Automated guided vehicles (AGV) are future products that can provide driverless transportation and can transport a variety of products without manual intervention in production, logistics, warehouse and distribution environments. The main advantage of AGV is that they can operate as independent systems with higher efficiency. The proposed work has the main function of AGV, of which EPROM is used to save data. Taking advantage of EPROM, the robot can maintain and continue to execute the current program even if the system returns to the power-on state after a period of power failure in a crisis situation. Compared with manual functions, AGV provides higher efficiency for many industries. The ultrasonic sensor assists the controller, which can realize the obstacle detection function in the robot. Through the artificial intelligence controlled by Bluetooth/Wi-Fi, AGV can be further improved to the level of automation.
Hexapod robot fault tolerant gait on slope and simulation verification
Authors: Liu Tao , Fan Xuanxia , Liu Yiqun , Jia Xiaowei , Deng Yuguo 
Published: August 2020

Abstract
Currently, hexapod robot has been widely used in the field of outdoor detection and nuclear power disaster relief because of its adaptability to terrain, excellent movement performance and redundant fault tolerance. In this paper, fault-tolerant gait and motion planning method on the slope are researched. Firstly, the kinematics model of the robot on the slope is established, and the Jacobian matrix mapping the foot end velocity and joint velocity is derived, which is the basis of the robot movement. Then the phase sequence of the robot with one leg fault is planned to solve the problem of leg phase coordination. After then, the adjustment strategy of the centre of gravity on the slope is planned, which can effectively improve the stability of the robot. Finally, a simulation is demonstrated to verify the research.
Study on the influence of the vehicle rear plan on wake flow field
Authors: Wu L L , Fu Y , Bu X B , Zhang X L , Ma X L 
Published: August 2020

Abstract
The rear plan is one of the key factors that affect the separation of air flow at the vehicle rear.It has important theoretical guidance and engineering significance to study the influence of the rear plan on wake flow field for the early development and design of vehicle shape.Based on a simplified SUV model, the drag coefficients of the models with different rear plans are calculated. The velocity separation, pressure distribution and energy dissipation of air flow at the vehicle rear are compared and analyzed,demonstrating that the rear plan has influence on air separation and the formation of wake vortex at the vehicle rear.It is found that with the decrease of the rear plan, the separation of the air flow at the vehicle rear becomes weaker, the wake vortex gets smaller, and the drag coefficient reduces.
Innovative design of side mould structure based on TRIZ theory
Authors: Chen Jiwen , Yu Yongpeng , Ji Shuai , Yang Peiwu 
Published: August 2020

AbstractIn order to meet the requirements of domestic prefabricated buildings and PC production lines, taking the side mould structure as the research object, an innovative design of the side mould structure based on TRIZ theory is proposed. The tools of TRIZ’s nine-screen method and conflict matrix are used to complete the innovation of the plugging device for the side mould reinforcement hole,and by using steel wire connection, the aluminum alloy sealing device can complete synchronous action and solve the problem of reinforcement hole leakage. Through the object field analysis tool in the TRIZ theory, to establish the function related to the existing system or new technology system problems, the double rocker mechanism is used to make the reset action and the demolding action of the side mould sealing device complete in a linked manner, to realize the design of the demoulding device and the side mould fixing device. The calculation and verification of the side mould structure verify that the side mould stiffness meets the production requirements, and improves the accuracy and placement accuracy of the side mould.
Research on obstacle detection and path planning based on visual navigation for mobile robot
Authors: Zheng Yixiao , Yan Bixi , Ma Chao , Wang Xinyu , Xue Haoyang 
Published: August 2020

Abstract
Both obstacle and path planning are of significance for autonomous visual navigation of a mobile robot which is able to realize free movement and obstacle avoidance. In this paper, a scheme of obstacle detection which is based on binocular vision to identify obstacles is constructed and it is combined with improved A* algorithm for obstacle avoidance motion for mobile robot platform. First, a binocular vision system to detect the robot’s perception of the environment is used and the visual information is obtained. Then a Gaussian filter is used to reduce the noise in the image, and the grayscale image is obtained through the binocular vision system. The gray scale map is matched with SAD (Sum of Absolute Differences) in order to obtain the disparity image with comparison. Second, the location information of the obstacle is extracted through the environmental depth information contained in the disparity image, and the improved A* algorithm is used as the path planning algorithm in this paper, which can modify the path of the planning error. Furthermore, the detection experiment of the robot visual obstacle avoidance system was established and the optimal path was obtained. The examples show that, the obstacle avoidance system can complete the task of obstacle detection and give a better path for the mobile robot.
Design of the Unsteady Vibrating Signals Order Analysis System for the Rotating Machinery
Authors: Liu Qihe 
Published: August 2020

Abstract
To eliminate the spectral ambiguity generated by FFT analysis method, the computational order tracking (COT) method is adopted to process the unsteady vibrating signals acquired from the rotating machinery. In this paper, the Lagrange 7-point interpolation algorithm is proposed to calculate the speed profile, the subsection interpolation method is developed based on the given angular acceleration threshold to obtain resampling time, and the sliding low-pass filtering interpolation method is adopted for angular resampling. According to these algorithms, the order analysis system is developed based on LabVIEW, and it is verified by the tests of simulation signals.
Analysis and Optimization of a Radial Flux Variable Reluctance Resolver
Authors: Pan Haihong , Wang Le , Yin Dejun 
Published: August 2020

Abstract
Variable Reluctance resolver as a shaft position detection unit has been wildly used in harsh environments because of high reliability. This paper uses the finite element method to analyze the influence of the harmonic components in the magnetic field on the accuracy of the resolver, and proposes a method to add slots at stator combined with optimizing the output winding distributions to reduce the harmonic content in the output voltage. Finally, the sinusoidal of output voltage turned out to be improved and the resolver met the measurement accuracy of ±30’.
Position Based Impedance Control of Electro-Hydrostatic Actuator
Authors: Zhou Guozhe , Lv Xin , Feng Tieshan , Gan Luoning 
Published: August 2020

Abstract
This paper presents a method for implementing position based impedance control (PBIC) in an electro-hydraulic actuator (EHA). Impedance control provides the actuator with compliance and facilitates the interaction with environment. Whereas most impedance control applications utilize electrical or valve-controlled hydraulic actuators, this work enables impedance control in a compact and efficient EHA. The selection of target impedance parameters is analysed and illustrated via root locus technique. The effectiveness of PBIC used in EHA and compliance of cylinder is shown in the impact test with several experimental results.
Tibetan-Chinese Neural Machine Translation Combining Attention Mechanism
Authors: Jiang Tao , Sun Hao , Dai Yu Gang , Liu Ding 
Published: August 2020

Abstract
Neural Machine Translation (NMT) has developed rapidly in recent years, and translation effects in most languages have surpassed statistical machine translation methods. The Seq2Seq framework has brought great advantages to machine translation, but the model still has great limitations in the ability to capture long-distance information. Recurrent neural networks (RNN) and LSTM networks are proposed to improve this problem, but the effect is not obvious. However, the proposal and application of the attention mechanism effectively compensated for this defect. This paper uses the attention mechanism as the basis to construct the encoder-decoder framework. This method analyzes the mechanism and principle of the attention model to implement the Tibetan-Chinese neural machine translation system. Compared with the previous neural network translation models, the results show that the translation model that incorporates the attention mechanism can obtain better translation results.
The principle and practice of measuring the sensitivity of power line spike pulse interference
Authors: Gao Tongguo , TaoWang  , Tang Daokui , Yang Jiaping 
Published: August 2020

Abstract
The measurement of power line spike interference sensitivity is an important item of EMC test. In this paper, the focus of the item and the principle of measurement are described. Combined with the engineering practice of cs06 project, a new way to solve the peak pulse interference of power line is given.