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Author

Chen Min

Bio: Chen Min is an academic researcher. The author has contributed to research in topics: PID controller & Control theory. The author has an hindex of 1, co-authored 1 publications receiving 8 citations.

Papers
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Journal ArticleDOI
TL;DR: In order to improve the response speed and steady output, the PID controller is designed to adjust the system, and the continuous and dispersed system models are simulated separately.
Abstract: A kind of giant magnetostrictive actuator(GMA)is designed.The structure and its working principle are presented and the static performance experiments are done.Through the analysis of the experimental results,the better linear work domain is found.Based on that,the mathematical model of GMA is analyzed and built.In order to improve the response speed and steady output,the PID controller is designed to adjust the system,and the continuous and dispersed system models are simulated separately.Then the effect of the controller is obtained.Finally,the experimental results are presented.Through the comparison between simulation results and experimental ones,it is shown that model of GMA is effective.

8 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a nonlinear dynamic model of the electrohydraulic servo system (EHSS) was established and the bifurcation characteristics and typical nonlinear dynamics behaviors implied within system were revealed.
Abstract: The electrohydraulic servo system (EHSS) has been widely utilized in industry and national defense. However, it is a complex dynamics system composed of many parts. The anomalies are easy to happen in operation, such as nonlinear vibration, noise, impact and so on. These anomalies significantly influence the stability of EHSS. Hence, in order to reveal the incentives, a nonlinear dynamic model was established. Then, the bifurcation characteristics and typical nonlinear dynamics behaviors implied within system were revealed. Moreover, the dynamic signals were measured from an experimental system and deeply analyzed by the effective methods of nonlinear dynamics. Results indicate that the variation of excitation force, spring force nonlinear term and damping can result in complicated nonlinear dynamic behaviors. The measured vibration signals of EHSS possess chaotic characteristic. Therefore, EHSS is a nonlinear dynamic system. This research provides a potent base for the study on nonlinear dynamics behavior of EHSS and makes the comprehensive analysis on nonlinear dynamics characteristics of EHSS become closer to reality.

20 citations

Journal ArticleDOI
Qing Pan1, Yibo Li1, Minghui Huang1, Zhaolong Zhao1, Peng-Da Ma1, Jun Ma1 
TL;DR: In this paper, stick-slip phenomenon of hydraulic forging press machine (HFPM), a nonlinear manufacturing system subjected to weak rigidity and negative friction velocity gradient, was investigated in slow-motion process.
Abstract: In this paper, stick–slip phenomenon of hydraulic forging press machine (HFPM), a nonlinear manufacturing system subjected to weak rigidity and negative friction velocity gradient, was investigated in slow-motion process. Dynamic characteristics of non-smooth motion were investigated experimentally under various operating conditions in slow-motion process. Taking into account the quadratic and cubic nonlinearities, the governing equation of the HFPM was derived. The method of multiple scales was employed to obtain approximate solution for velocity oscillation during slow motion. The steady-state responses for each case (i.e., non-resonance, primary, super-harmonic and sub-harmonic oscillation) were examined to investigate the correlation between velocity oscillation and nonlinear vibration in slow motion. The effects of viscous damping coefficient, hydraulic stiffness, friction parameters, excitation amplitude and frequency on the amplitude–frequency response characteristics were studied, and the interaction between system dynamics and tribological effects were presented. The stability of operational conditions and the critical velocity of the forging process were analyzed through the bifurcation techniques. Experimental results conducted on the HFPM verify the effectiveness of the proposed method.

6 citations

Journal ArticleDOI
TL;DR: In this paper, a nonlinear dynamics model and a mathematical expression were set up to investigate the mechanism and conditions of vibration creep acceleration, and some measures were proposed to improve the low-speed stability of the hydraulic motor.
Abstract: A nonlinear dynamics model and a mathematical expression were set up to investigate the mechanism and conditions of vibration creep acceleration. The model shows that hydraulic spring and nonlinear friction are major factors that can affect low-speed instability. The mathematic model was established to obtain the change rule of speed and instantaneous acceleration of the hydraulic motor. Then, Matlab was used to simulate the effect of nonlinear friction force and hydraulic motor parameters such as coefficient of leak and compression ratio, etc., under low speed. Finally, some measures were proposed to improve the low-speed stability of the hydraulic motor.

6 citations

Book ChapterDOI
01 Jan 2014
TL;DR: Numerical simulation results show that the proposed magnetostrictive hybrid vibration isolation system (MHVIS) can quickly improve system response speed, broaden vibration frequencies and effectively decrease the force transmitted to foundation with a good control performance.
Abstract: There is a little deficiency of passive vibration isolation system for mechanical equipment in the low frequency, based on the GMA and sliding mode algorithm. The model of magnetostrictive hybrid vibration isolation system (MHVIS) is proposed with the combination of intelligent magnetostrictive materials, passive vibration and active control. Numerical simulation results show that the MHVIS can quickly improve system response speed, broaden vibration frequencies and effectively decrease the force transmitted to foundation with a good control performance.

5 citations

Journal ArticleDOI
TL;DR: A nonlinear dynamic analysis method is proposed to overcome the complexity and strong nonlinearity of hydraulic driving processes, which makes their dynamic behavior difficult to estimate.

4 citations