关键词: 主动振动, 油膜刚度, 阻尼系数, 固有频率, 振幅

Abstract:

Based on hydrostatic slide under the force load, the active vibration models of the open type and the closed type hydrostatic slide were established, and then the oil film stiffness and the damping coefficient of the hydrostatic slide were derived. Imposing harmonic and anharmonic periodical load to the slide, the natural frequency, the amplitude and the phase angle of the slide system were calculated separately, and the influence of the design parameters of the slide system on the natural frequency and the amplitude was analyzed theoretically. Taking the closed type liquid hydrostatic slide as example, the natural frequency and the amplitude amplifying coefficient were analyzed. The results show that the natural frequency can be regulated by changing the pressure of the oil pocket and the thickness of the oil film, and then under the force load the pressure of the oil pocket makes no impact on the amplitude, but the thickness of the oil film, the oil temperature and the frequency of the load do. The proposed research analyzes the active vibration of a liquid hydrostatic slide system under force load, and provides a basis for reducing the vibration of the hydrostatic slide and improves the machining accuracy in the practical engineering.

Key words: active vibration, oil film stiffness, damping coefficient, natural frequency, amplitude