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Automotive Engineering ›› 2025, Vol. 47 ›› Issue (2): 332-341.doi: 10.19562/j.chinasae.qcgc.2025.02.014

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Dynamic Performance Analysis of ISD Suspension for Vehicles Based on Fractional-Order Skyhook Control

Yujie Shen1(),Kai Ji1,Rongnan Huang1,Xiaofeng Yang2,Yanling Liu2   

  1. 1.Automotive Engineering Research Institute,Jiangsu University,Zhenjiang 212013
    2.School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013
  • Received:2024-06-28 Revised:2024-08-18 Online:2025-02-25 Published:2025-02-21
  • Contact: Yujie Shen E-mail:shenyujie@ujs.edu.cn

Abstract:

With the aim of improving vehicle ride comfort, in this paper a fractional-order skyhook control strategy based on the fractional order calculus theory is proposed. Firstly, a fractional-order skyhook vehicle suspension dynamic model is established to derive analytical expressions for the fractional-order skyhook damping force and fractional-order skyhook inertial force. Subsequently, particle swarm optimization algorithm is used to optimize the key parameters of the suspension. In order to solve the problem that fractional-order force cannot be realized physically, a vehicle ISD (inerter-spring-damper) suspension with mechatronic inerter is chosen as the controlled model. A model reference adaptive controller based on fractional-order skyhook is designed to track the mechanical performance output of the fractional-order suspension. Dynamic performance analyses of fractional-order skyhook inerter suspension and fractional-order skyhook damper suspension is conducted from both frequency-domain and time-domain perspectives. Simulation results show that fractional-order skyhook ISD suspension has more significant advantages in reinforcing ride comfort than integer-order skyhook ISD suspension. Under random road input, the root-mean-square value of vehicle body acceleration of fractional-order skyhook damper suspension decreases by 18.3%, while the fractional-order skyhook ISD suspension decreases by 20.6%. The bench test results demonstrate that the vehicle ISD suspension based on fractional-order skyhook further enhances ride comfort, offering new insights for the design of vehicle ISD suspension.

Key words: vehicle inerter-spring-damper suspension, fractional-order theory, skyhook control, mechatronic inerter