【摘要】 车辆液压系统在工作过程中会受到车体振动与泵源液压脉动双重激励的影响,对压力波的传递及管网的振动产生重要影响。针对车辆液压系统泵源激励和车辆机体激励产生的振动进行分析,研究多源激励下管路的振动规律及压力波的传递规律。首先对泵源与机体共同激励下管路振动的计算方法进行了分析,将流体域动力学方程与固体域动力学方程进行组合,建立了流固耦合的总体动力学方程,然后对方程进行离散求解。基于理论推导,采用数值模拟的方法对液压管路的振动进行了分析,研究发现,液压系统在泵源谐波激励下的振动响应表现为宽频域的强迫振动,其谐波频率与泵源流体压力脉动频率保持一致,当泵源产生的压力脉动频率与液压管路的固有频率接近时,会激起管路结构大幅度共振响应。更多还原

【Abstract】 The vehicle hydraulic system will be affected by the dual excitation of vehicle body vibration and pump source hydraulic pulsation in the working process, which has an important impact on the transmission of pressure wave and the vibration of pipe network. In this paper, the vibration of vehicle hydraulic system caused by pump source excitation and vehicle body excitation is analyzed, and the law of pipeline vibration and pressure wave transmission under multi-source excitation is studied. This paper analyzes the transmission of pipeline vibration and pressure pulsation under pump source excitation and vehicle body excitation. It is found that with the increase of gear pump speed, the amplitude of fluid pressure fluctuation increases. The vibration response of hydraulic system under the pump source harmonic excitation is forced vibration in wide frequency domain, and the harmonic frequency is consistent with the pressure fluctuation frequency of pump source fluid. When the pressure pulsation frequency of the pump source is close to the natural frequency of the hydraulic pipeline, a large resonance response of the pipeline structure will be aroused.更多还原