一种主动液压滤波器的理论分析

Theoretical Analysis of a Kind of Hydraulic Active Filter

针对目前被动式液压滤波器所存在的问题，提出了主动控制式滤波的概念．在简要介绍其工作原理的基础上，对一种由双蓄能器压电晶体（ＰＺＴ）驱动的静平衡可变容腔液压主动滤波器进行了理论分析，弄清了其滤波机理．为了正确描述泵管路负载所组成的液压系统的联合工作特性，提出了泵和负载的确切数学模型以及两者的匹配方法．最后，给出了在合理考虑液压源特性和液压负载特性的前提下为达到希望滤波性能所需控制律的选择方法．

Aiming at the problems existing in traditional passive hydraulic filter, a concept of hydraulic filter with active control is presented. Based on its simple operation principle, the theoretical analysis for a kind of active control hydraulic filter with static pressure balance and variable chamber, driven by double accumulator piezoelectric crystal, is carried out, and its attenuating principle is understood. In order to describe the united operating characteristics of hydraulic system composed of pump, pipe line and load, the accurate mathematical models of pump and load, and the matching method between pump and load are put forward.Finally, the selection method of the control law for achieving the desirable vibration absorption behavior is proposed considering hydraulic supply characteristics and hydraulic load characteristics reasonably.