基于Simulink的油气特性对油气悬架性能影响分析

油气悬架的特性是由内及外的,内部物质的状态很大程度上决定了悬挂对外界输入的响应。基于油气悬架的结构特点,考虑气体在油液中的溶解和掺混、油液经小孔节流产生的气体和密封圈的摩擦力,建立油气悬架非线性数学模型。基于Simulink搭建分析模型,对油气悬架工作过程进行分析,对不同频率激励的响应、气体压力变化进行对比分析,并对单向阀阻尼孔参数的改变及气体溶解于油液的特性对油气悬架外特性的影响进行分析。分析结果可知:单向阀尺寸的改变对油气悬架在持续正弦激励下的外特性影响较小,而阻尼孔的尺寸对其影响较大;气体溶解于油液的特性会影响油气悬架的外特性,油气不分离式油气悬架的溶解特性可以降低悬架输出力的振动幅度,使得悬架内部状态更平稳,有效提高整个系统的可靠性。

Performance Effect Analysis of Oil and Gas Characteristics on Hydro pneumatic Suspension Based on Simulink

Hydro-pneumatic suspension`s properties are determined by its internal state,and the internal state of the inside substance largely determines the suspension response to external input.Based on the structural characteristics of the hydro-pneumatic suspension,considering the gas dissolved in the oil and the gas generated by orifice and seal friction,the output force was established by nonlinear mathematical model.The analysis model was built based on Simulink,and the working process of hydro-pneumatic suspension was analyzed.Response under different frequency excitation and gas pressure changes were contrastively analyzed,the influences of one-way valve damping hole parameters change and the characteristics of gases dissolved in oil on hydro-pneumatic suspension external characteristics were analyzed.The results show that: one-way valve size change has little effect on hydro-pneumatic suspension external characteristics under continued sinusoidal excitation,but the size of damping hole has greater impact;the characteristics of gases dissolved in oil will affect the hydro-pneumatic suspension external characteristic;oil and gas not separation type oil-gas suspension solution characteristics can reduce the vibration amplitude of the output force of suspension.The suspension internal state is more stable,effectively improving the reliability of the whole system.