工程车辆单气室油气不分离式油气悬架内随油液流动进入环形腔的气体，在环形腔内溶解析出会对油气悬架性能产生一定的影响．为此，文中建立以环形腔内气体体积为判断导向的油气悬架非线性数学模型，采用联合模拟仿真的方法求解非线性方程组，分析环形腔内气体溶解析出对环形腔内压力变化的影响，并搭建等比例油气悬架试验台进行验证．仿真结果和试验结果对比表明: 文中建立的数学模型能够准确地描述环形腔内气体溶解析出变化对油气悬架性能的影响; 环形腔内气体溶解析出在油气悬架设计和使用过程中不可忽略; 在此影响过程中气体溶解度和油气悬架外加激励的作用明显; 环形腔内气体溶解析出变化对油气悬架簧上质量相对位移的影响有限，但对油气悬架内部结构的冲击、振动强度及寿命有较大的影响．

In the single chamber- type hydro- pneumatic suspension of construction vehicles,some gas flows into ringcavity with liquid,and the gas dissolution and precipitation in the ring cavity can affect the suspension performanceto some extent.In order to reveal the effect mechanism,a nonlinear mathematical model of hydro- pneumaticsuspension is established on the basis of gas volume in the ring cavity.In this model,a co- simulation method isused to solve nonlinear equations so as to analyze the effect of the gas dissolution and precipitation in the ring cavityon the pressure.Furthermore,an equally- proportional hydro- pneumatic suspension test bench is set up to verify theco- simulation results.Comparison between the co- simulation and experimental results indicates that (1) the pro-posed model can accurately describe the effect of the gas dissolution and precipitation in ring cavity on the suspen-sion performance and the effect should not be ignored in the design and application of this kind of suspension;(2) the gas solubility and the external stimulation play an important role in the effect; and (3) the gas dissolutionand precipitation have a small effect on the suspension spring quality but have strong effects on the impact,vibra-tion strength and durability of internal structure of the hydro pneumatic suspension.