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为研究随机振动对贮箱增压系统动态特性和稳定性的影响,引入管路元件壳体坐标实现外激振动的加载,以谐波叠加法模拟飞行环境的随机振动过程,对管路和管路元件分别建立拉格朗日坐标下的一维流动方程和常微分方程组以模拟增压系统动态工作过程,对某贮箱增压系统有/无外界激励振动条件下的工作过程进行了全程计算.计算结果表明:振动环境下减压器、稳压器等运动元件的瞬时流量变化在增压系统中产生压力波动,某些情况下,会导致减压器等出现具有一个主要频率的振荡过程,影响减压器工作稳定性;振动过程中贮箱气枕压力基本不受影响.无振动条件下的计算结果与试验数据基本吻合.提出的模型和方法在贮箱增压系统工作过程仿真中显示了较好的有效性.
In order to study the influence of stochastic vibration on the dynamic characteristics and stability of the tank pressurization system, the shell element coordinate of the pipeline is introduced to realize the external vibration loading. The random vibration process of the flight environment is simulated by the harmonic superposition method. Road elements are established Lagrange coordinates one-dimensional flow equations and systems of ordinary differential equations to simulate the dynamic process of the pressurized system, a tank supercharger with / without external excitation vibration under the conditions of the whole process The calculation results show that the instantaneous flow variation of the moving elements such as pressure reducer and voltage regulator in the vibration environment will generate pressure fluctuation in the pressurization system and in some cases will cause the pressure reducer to oscillate with a main frequency Process, the stability of the pressure reducer work; during the vibration process, the pressure on the air bag is basically unaffected.The calculation results without vibration are in good agreement with the experimental data.The proposed model and method are applied in the simulation of working process of the tank pressurization system In the show a better effectiveness.