关键词: 补偿, 节流器, 静压支承, 压电陶瓷

Abstract: 　　A new method is presented for on- line measuring and compensating for the axis drift in a hydrostatic bearing boring bar with double supports, in order to improve the co- axial accuracy of bored workpieces, such as crankshaft hole of combustions, automobile engine box and etc.. Wherein, a new type of controllable piezoelectric-supported throttle is designed to change the oil pressures of bearing cavities, and the effect of the disturbance load can be suppressed, and consequently, the axis drift of the bar can be compensated for by the stragy of time-optimal control. The results show that the total drift error value of the bar can be eliminated by 50％ at least.

Key words: Hydrostatic-bearing, Piezoelectric ceramics, Throttle compensation