2D数字阀流量规划补偿死区研究

Study on Flow Program Compensation Technology for Dead Zone of 2D Digital Valves

阐述了2D数字阀的结构和工作原理,分析了2D数字阀死区产生的原因,针对传统的颤振补偿死区方法的不足,提出流量规划补偿死区的新方法,并研究了流量规划同时叠加少量颤振补偿技术。实验结果表明,采用流量规划补偿后,死区基本消失,但滞环依然存在;采用流量规划同时叠加少量颤振补偿技术进行补偿,可以完全消除死区,滞环也明显减小,非线性度小于0.5%,能够达到伺服系统的要求。在死区补偿之后,该阀在25%满量程的正弦波控制下,-3 dB处幅频宽可达141 Hz。

The structure and working principle of a 2D digital valve were described firstly,then the causes of 2D digital valve dead zone were analyzed. In view of the problems existing in the traditional dither compensation technology,a new compensation method of flow program was proposed, and the technology of flow program superposing dither compensation was studied. The experimental results show that,after flow program compensation,the dead zone almost disappears,but hysteresis still ex- ists;the dead zone can be completely eliminated and the hysteresis significantly reduced after applying the technology of flow program superposing dither compensation. Finally the nonlinearity is less than 0.5%, which achieves the requirements of the servo system. Its frequency response is as 141 Ha at -3 dB of 25% maximum spool displacement after compensating the dead.