考虑气液混合流体时变特性的阀片式液压互联悬架建模

针对液压互联悬架中气液混合流体对悬架系统特性的影响,推导了气液混合流体物理性质的时变特性模型,提出一种非线性形变修正函数,用以修正所建立的阻尼阀阀片变形等效模型,从而建立了一种考虑气液混合流体时变特性的阀片式单缸液压互联悬架非线性动力学模型,并通过台架试验加以验证。仿真结果表明:气液混合流体时变特性会导致液压互联悬架系统阻尼特性曲线出现明显的“迟滞”现象,并降低阻尼力的峰值,与试验结果对比显示,所提出的建模方法能准确描述“迟滞”现象,且与台架试验结果基本吻合。

Modeling of Shim Valve Type Hydraulically Interconnected Suspension Considering the Time⁃varying Characteristics of Gas⁃liquid Emulsion

In view of the effects of gas?liquid emulsion in hydraulically interconnected suspension(HIS)system,a time?varying characteristics model for the physical properties of gas?liquid emulsion is derived,a nonlin?ear deformation correction function is proposed for correcting the equivalent shim deformation model built for damp?ing valve and hence a nonlinear dynamics model of valve?type single?cylinder HIS system considering the time?vary?ing characteristics of gas?liquid emulsion is established and then verified by bench test.The results of simulation show that the time?varying characteristics of gas?liquid emulsion may lead to the appearance of the“hysteresis”phe?nomenon on the characteristic curve of HIS system with reduced damping force peak.The comparison with test re?sults demonstrates that the modeling method proposed can accurately describe the“hysteresis”phenomenon with a result basically agreeing with test one.