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›› 2018, Vol. 40 ›› Issue (9): 1083-1088.doi: 10.19562/j.chinasae.qcgc.2018.09.012

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Influence of Inertia Mass in Actuator on Amplitude-frequency
Characteristics of Active Suspension System

Wang Xingye, Zhang Jinqiu, Liu Yile, Zhang Jian & Peng Zhizhao   

  1. Department of Vehicle Engineering, Academy of Army Armored Force, Beijing 100072
  • Received:2018-02-01 Online:2018-09-25 Published:2018-09-25

Abstract: A rack-pinion type actuator for vehicle active suspension is designed, and the influence of actuator inertia mass on the amplitude-frequency characteristics of active suspension system is investigated. Firstly the calculation method of inertia mass is given and the effects of inertia mass on the natural frequency of suspension system are analyzed. Then the transfer characteristics of three evaluation indicators of suspension system in four situations, i.e. traditional passive suspension, suspension with inertia mass added, suspension with inertia mass and skyhook (SH) control and suspension with inertia mass and acceleration damping driven (ADD) control are compared. Finally bench tests are conducted for verification. The results show that the adding of inertia mass reduces the inherent frequency of car body and tire, and hence improves the vibration in middle-low frequency region but aggravates the vibration in high-frequency region. SH control can only improve the vibration suppression effects in middle-low frequency region but aggravate the vibration in high-frequency region, while ADD control can alleviate the aggravation of vibration and relatively better enhance vibration suppression effects in middle-high frequency region. Therefore the active suspension system with actuator inertia mass should select ADD control algorithm with better vibration suppression effects in middle-high frequency region

Key words: active suspension, actuator, inertia mass, amplitude-frequency characteristics