摘要
针对气动比例阀的摩擦力是造成其死区的主要因素,分析了比例阀摩擦力的产生原因。根据振动对摩擦力的影响,对气动比例阀叠加高频低幅颤振信号进行摩擦力补偿的机理进行了研究,并基于软件VC++和LabVIEW开发出摩擦力颤振补偿器。实验结果表明,通过在控制信号上叠加高频低幅的颤振信号,使阀芯始终处于微小振动状态,可以有效克服比例阀摩擦力,消除爬行现象,缩短滞后时间。该补偿方法具有较高的工程应用价值。
The friction of a pneumatic proportional valve is the major reason resulting in the valve dead zone.The relation between the valve friction and the spool radial unbalanced force is analyzed,the friction compensation mechanisum with highfrequency low-amplitude dither signals acting on the valve is discussed based on vibrational effects,and the friction compensator is designed by use of VC++ and LabVIEW.Experimental results show that compensation is obtained by adding dither signals to the control signal to keep the spool vibrating persistently,the proportional valve friction is obviously reduced,the system crawl disappers,and the time delay is shortened.The proposed friction compedsation method is shown to be valuable in engineering.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第2期107-109,共3页
Journal of Vibration and Shock
