摘要
液体静压支承具有很多优良性能 :高运动精度 ,低摩擦功耗 ,小轴心偏移 ,大承载能力 ,强抗振性能与长使用寿命等 ,但这些优良的静态性能必须在上佳的动态性能保证下才能充分显示出来 ,因此 ,液体静压支承静态性能保证机床运动与加工精度 ,而动态性能则保证设备的安全与工作条件。文章根据力平衡与流量连续条件建立支承系统传递函数 ,导出支承系统动态性能新表达式即稳定性判别、抗瞬态干扰能力、固有频率与在稳态周期干扰力作用下产生的动刚度与最大振幅。通过试验台实验证实 ,液体静压支承动态性能新表达式计算结果可靠而且物理概念清晰 ,公式简单 。
Hydrostatic bearing has many advantages, such as high accuracy of movement, low power consumption of friction, small deflection of bearing center, high capacity of load carrying, powerful absorption of vibration and long life of operation, etc. But good static performance can fully be displayed only under good dynamic performance of hydrostatic bearing. The moving and rotating accuracy are determined by its static performance and working conditions are decided by its dogmatic performance. According to mechanic balance and flow continuity, the transfer function of hydrostatic bearing system is established in this paper. On the basis of this transfer function, the new formulas of dynamic performances, namely the formulas of system stability, dynamic stiffness, nature frequency, maximum amplitude are derived. The bearing clearance of hydrostatic bearing with new variable restrictor can be controlled in constant or near constant. But the clearance of hydrostatic bearing with constant restrictor may be changed into little clearance at the loading on it. Therefore, there are many differences between their dynamic characteristics. [
出处
《中国工程科学》
2003年第3期62-66,共5页
Strategic Study of CAE
关键词
实验验证
动态性能
传递函数
动刚度
谐振
频率
液体静压支承
dynamic properties
transfer functions
dynamic stiffness
resonance
frequency
hydrostatic bearing
