Journal of South China University of Technology(Natural Science) >

2025 , Vol. 53 >Issue 7: 39 - 49

DOI: https://doi.org/10.12141/j.issn.1000-565X.240241

Mechanical Engineering

High-Precision Improved Hyperbolic Tangent Model for Multi-Stage Flow Channel Magnetorheological Damper

  • DU Heng ,
  • Lü Yanting ,
  • HUANG Hui ,
  • MA Baizhou
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  • School of Mechanical Engineering and Automation/Key Laboratory of Fluid Power and Intelligent Electro-Hydraulic Control of Fujian Provincial Universities，Fuzhou University，Fuzhou 350108，Fujian，China
杜恒（1983—），男，教授，博士生导师，主要从事流体控制技术研究。E-mail： duheng@fzu.edu.cn

Received date: 2024-05-22

  Online published: 2025-01-16

Supported by

the National Natural Science Foundation of China(52105053)

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Abstract

The multi-stage flow channel magnetorheological damper (MFC-MRD) in the hydraulic actuator can effectively improve the underdamping characteristics of hydraulic valve-controlled cylinder system and improve the stability of the system. It possesses potential application value in such equipment such as legged robots and excavators. However, the high power density design of MFC-MRD may inevitably increase the effective length of the damping channel, thereby increasing the damping force of the system, which makes the existing dynamic model cannot accurately describe the nonlinear hysteresis characteristics of MFC-MRD. In order to improve the nonlinear hysteresis characteristics of MFC-MRD, on the basis of mechanical performance test and by analyzing the multi-stage flow channel structure and nonlinear hysteresis curve characteristics, the hyperbolic tangent curve is segmented and reorganized, and then an improved hyperbolic tangent model conforming to the hysteresis characteristics is proposed. In the process of parameter identification, to avoid model parameters falling into local optimum and “premature”, the selection operator of genetic algorithm is improved, and a three-level stepwise approximation selection operator is proposed to improve the identification accuracy of model parameters. Moreover, the relationship between model parameters and current is accurately obtained according to the mechanical experimental data. The comparison results of different models show that the improved hyperbolic tangent model established in this paper is of higher accuracy than the Bouc-Wen model and the data-driven model because it can accurately describe the nonlinear hysteresis characteristics of MFC-MRD, with an accuracy increase of up to 75%.

Key words： multi-stage flow channel magnetorheological damper; hyperbolic tangent curve; forward kinematics model; improved genetic algorithm; parameter identification

Cite this article

DU Heng , Lü Yanting , HUANG Hui , MA Baizhou . High-Precision Improved Hyperbolic Tangent Model for Multi-Stage Flow Channel Magnetorheological Damper[J]. Journal of South China University of Technology(Natural Science), 2025 , 53(7) : 39 -49 . DOI: 10.12141/j.issn.1000-565X.240241

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