直线共轭内啮合齿轮泵集中参数法建模与激振源研究

Lumped Parameter Modeling and Excitation Sources Analysis of Linear Conjugated Internal Gear Pumps

摘要:

直线共轭内啮合齿轮泵作为高效且静谧性能良好的动力元件，在电静压作动系统得到广泛应用。本文采用集中参数法建立直线共轭内啮合齿轮泵仿真模型。建立了实验平台，对直线共轭内啮合齿轮泵进出口压力脉动进行了测试。分析了直线共轭内啮合齿轮泵在吸排油区的压力脉动、齿腔内压力分布以及齿轮和齿圈在x轴和y轴方向的径向力等激振源。研究结果表明：所建立的直线共轭内啮合齿轮泵集中参数模型具有良好的精度和可靠性；齿轮和齿圈径向力随偏转角周期变化，在x轴方向，齿轮所受到的径向力指向低压区，齿圈受到的径向力指向高压区。在y轴方向，齿轮和齿圈所受到的径向力在正负之间波动。齿轮和齿圈所受径向力在x轴方向的基频幅值均小于其在y轴方向的基频幅值；困油现象会导致齿腔压力略微升高。研究结果为直线共轭内啮合齿轮泵的优化设计和振动噪声分析提供了参考。

Abstract:

Linear conjugated internal gear pumps are widely used in eletro-hydrostatic actuating systems as power elements with their efficient and low-noise performance. A linear conjugated internal gear pump simulation model was established by the lumped parameter method, the fluid domain within a linear conjugated internal gear pump can be specified as a finite number of volumes where the fluid properties (e.g, pressure, density, and modulus of elasticity, etc.) can be considered as concentrated variables. A test platform was constructed to measure the suction and discharge pressure pulsations of the linear conjugated internal gear pump. The excitation sources, including the pressure pulsation in the inlet and outlet ports, the pressure in the tooth cavity, and the radial force of the gear and tooth ring in the x and y directions were calculated and analyzed. The results demonstrated that the lumped parameter model of linear conjugate internal gear pump established had good accuracy and reliability. The magnitude of the radial force on the gear and tooth ring varied periodically with the deflection angle. In the x direction, the radial force acting on the tooth ring was pointed to the low-pressure side, and the radial force acting on the gear was pointed to the high-pressure side. In the y direction, both theradial forces acting on the gear and ring were fluctuated between positive and negative values. The radial forces in the x direction were smaller than those in the y direction at the fundamental harmonic;the phenomenon of oil trapping led to a slight increase in the pressure in the tooth cavities. The research result can provide a reference for the optimized design and vibration noise analysis of linear conjugated internal gear pumps.