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Characterization of a hydro-pneumatic suspension strut with gas-oil emulsion

机译：油气悬架的油气悬架支撑特性

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The nonlinear stiffness and damping properties of a simple and low-cost design of a hydro-pneumatic suspension (HPS) strut that permits entrapment of gas into the hydraulic oil are characterized experimentally and analytically. The formulation of gas-oil emulsion is studied in the laboratory, and the variations in the bulk modulus and mass density of the emulsion are formulated as a function of the gas volume fraction. An analytical model of the HPS is formulated considering polytropic change in the gas state, seal friction, and the gas-oil emulsion flows through orifices and valves. The model is formulated considering one and two bleed orifices configurations of the strut. The measured data acquired under a nearly constant temperature are used to identify gas volume fraction of the emulsion, and friction and flow discharge coefficients as functions of the strut velocity and fluid pressure. The results suggested that single orifice configuration, owing to high fluid pressure, causes greater gas entrapment within the oil and thus significantly higher compressibility of the gas-oil emulsion. The model results obtained under different excitations in the 0.1–8 Hz frequency range showed reasonably good agreements with the measured stiffness and damping properties of the HPS strut. The results show that the variations in fluid compressibility and free gas volume cause increase in effective stiffness but considerable reduction in the damping in a highly nonlinear manner. Increasing the gas volume fraction resulted in substantial hysteresis in the force–deflection and force–velocity characteristics of the strut.
机译：通过实验和分析对液压气动悬架（HPS）支杆的简单，低成本设计的非线性刚度和阻尼特性进行了表征，该支路允许将气体截留在液压油中。在实验室研究了气油乳液的配方，并将乳液的体积模量和质量密度的变化作为气体体积分数的函数进行了配方。考虑到气态的多方变化，密封摩擦以及气油乳状液流经节流孔和阀门，制定了HPS分析模型。该模型是考虑到支撑杆的一个和两个排出口构造而成的。在几乎恒定的温度下获取的测量数据用于识别乳液的气体体积分数，以及摩擦系数和流量排放系数，它们是支杆速度和流体压力的函数。结果表明，由于流体压力高，单孔构造会导致更大的气体滞留在油中，从而显着提高气油乳液的可压缩性。在0.1–8 Hz频率范围内的不同激励下获得的模型结果显示，与所测得的HPS支杆的刚度和阻尼特性具有相当好的一致性。结果表明，流体可压缩性和自由气体体积的变化会导致有效刚度的增加，但会以高度非线性的方式显着降低阻尼。气体体积分数的增加导致支杆的力-挠度和力-速度特性出现明显的滞后现象。

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