含惯容器的剪式座椅悬架动态特性研究

Research on Dynamic Characteristics of ISD Scissors Seat Suspension

为改善重型商用车辆剪式座椅的减振性能以提高驾驶员的乘坐舒适性,设计由惯容器(Inerter)、弹簧和阻尼器组成的剪式座椅ISD(Inerter-Spring-Damper)悬架,分析液压缸马达液力式惯容器的结构组成、工作原理和减振特性.针对某三轴式重型运输车建立了含ISD剪式座椅的9自由度半车模型,基于MATLAB分别在时域和频域内对ISD剪式座椅和传统剪式座椅的振动响应进行了仿真分析.结果表明:ISD剪式座椅的时域振动响应明显小于传统剪式座椅,减小的幅度随车速提高而下降,体现了惯容器"通高频,阻低频"的减振特性;在人体敏感的频率范围,ISD座椅的频域振动响应明显小于传统剪式座椅,说明ISD座椅可以提高驾驶员的乘坐舒适性.

In order to improve the comfortability of its driver of a heavy commercial vehicle, a scissors seat suspension is designed with an inerter-spring-damper （ISD） assembly. The structure, working principle and vibration-isolation characteristics of the hydraulic inerter are analyzed. A 9-DOF half- vehicle model with an ISD scissors seat suspension is established based on the parameters of a three-axle heavy-duty truck. The vibration responses both in time domain and in frequency domain between an ISD seat suspension and traditional one are simulated in MATLAB. The results show that the time-domain vibration response of the ISD seat suspension is obviously less than that of the traditional one, and its reduction decreases as the speed increases, reflecting the inerter characteristics of the so-called ＇ passing high frequency and resisting low frequency＇. The results also show that, in the frequency range of human sensitiveness, the frequency-domain vibration response of the ISD seat suspension is obviously less than that of the traditional one, indicating the ISD seat suspension could improve the ride comfort of the driver.