【摘要】 讨论了考虑油液压缩性时减摆阻尼器的数学模型,在液压缸的压力微分方程中引入变化的体积弹性模量。用数字仿真方法模拟减摆阻尼器的动态阻尼特性,并与K8飞机的前轮操纵减摆器的动态阻尼试验作了对比。试验工况包含有意设置的缺油工况,即明显含有空气泡的情况。结果表明,不考虑油液压缩性的仿真结果与实测功量图明显不符,油液压缩性对减摆阻尼器的动态阻尼特性有较大影响。本文还讨论了含气量、振幅、频率等因素对动态阻尼特性的影响更多还原

【Abstract】 It is known that some level of entrained air in fluids is inevitable. The air presented in the form of bubbles makes the fluid in dampers compressible obviously. A ma thematical model is developed to describe the hydraulic damper′s property with compressible fluids. The varying bulk modulus is introduced into the pressure differential equation. Numerical simulation is compared with the experiments for the landing gear shimmy damper of K8 aircraft. The experiments include the case in which the fluids in the damper are insufficient, that is some amount of free air is contained in the damper. The research indicates that the compressibility affect the property of hydraulic dampers. The effect of air percentage, amplitude and frequency of exciting vibration upon the damping property is also discussed.更多还原