Papers by Author: Guo Yun Li

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Authors: Guo Yang Wu, Jun Jie Yang, Cheng Rong Jiang, Yun Song Li, Guo Yun Li
Abstract: Based on the practical working state and load conditions of a car, the stress-strain and its strength in static and dynamic state of a new torsional vibration damper were calculated and analyzed with the finite element theory and tools, providing reliable data and a simple and accurate research method of strength for its practical application.Through strength analysis, the maximum equivalent stress of main parts of damper under static load and the stress time curve under dynamic load were obtained. By comparing the analytical results under static and dynamic load, it shows that all parts of the damper meet the strength requirements under the dynamic load, and that the maximum stress value of main parts under idle speed conditions is higher than that of running conditions, which is consistent with the actual working condition; while under the static load, the rivets did not meet the strength requirement. In conclusion, two feasible methods were proposed to improve the strength of rivets. It is verified that this damper can meet working strength requirements at last.
Authors: Jian Jun Hu, Zheng Bin He, Peng Ge, Guo Yun Li
Abstract: In order to analyze dynamic characteristic accurately during steering, electric power steering system is selected as research object and dynamic equation of steering system is established. Combined with eleven degrees of freedom vehicle model and tire model at combined conditions of longitudinal slip and side slip, the integral-simulation model of electric power steering system is established. The dynamic response of steering system at different steering wheel angle, control methods, front wheel steering angle and braking force is analyzed. The simulation results show that electric power steering system with neural network control has good stability, tracking performance, assist characteristic and anti-interference ability. The established model can reflect the dynamic characteristic correctly and effectively during steering.
Authors: Xing Qiang Tan, Guo Yun Li
Abstract: 6_PUS parallel mechanism is a new type manipulator which has two guide rails, along which six sliders connected with tie rods by hooke joints are driven by linear motor and then motion platform is driven by tie rods. In order to obtain precision loci of motion platform, linear motor should be controlled exactly. During the modeling of 6_PUS parallel mechanism, RBF NN is selected to approach the nonlinear of this manipulator, and neuron PID controller is used to regulate the controlled object. In this paper, regulating rules of the control system is introduced in detail, and the control efficiency is proved by experiments which show neuron adaptive PID controller can deal the nonlinear of 6_PUS parallel mechanism and get preferable control precision to ordinary PID controller.
Authors: Ming Hui Hu, Shao Zhi Xu, Da Tong Qin, Guo Yun Li
Abstract: Based on the vehicle dynamic equation in starting engine in-motion process for HEV, theoretical derivation is conducted to obtain the impact hardness equation in the process. By using matlab/simulink, the law of influence the parameters have on the impact hardness equation is analyzed. Then, coordinated control stategy between the clutch pressure and motor torque, and between motor torque and engine torque is proposed based on the influence law. At last a test bed of the starting engine in-motion for HEV is implemented. The test results show that the change rate of clutch pressure, motor torque and engine torque, can effectively coordinate the change relation between the clutch pressure, the motor torque, and the engine torque. And the test results satisfy the requirements of ride comfort in starting engine in-motion process for HEV well.
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