增量PID算法在某风洞压力控制中的应用改进

Improving Application of Increment PID Adjust Method For Pressure Control in Wind Tunnel

摘要:

为解决风洞高度模拟控制系统对风洞总压有效控制的问题,根据系统特点,选取了定水环泵转速,利用增量PID控制算法调节补气调节阀开度的控制策略；针对直接采用增量PID控制算法,风洞总压振荡时间长,无法满足试验要求的问题；分析了影响控制效果的原因,根据整个系统的大惯性、大滞后特性提出了在增量PID控制的基础上采用超前调节的解决措施,并研究确定了进行超前调节的时机和调节方法,最后按照该方法进行了常用压力控制点的系统调试；调试结果表明:在不超过300 s的调节过渡时间内总压能稳定至性能指标要求的±100 Pa精度范围,满足了试验要求,证明了该控制方法的可行性；该超前调节措施在为风洞总压控制提供了有效方法的同时,也为类似大惯性、大滞后特性系统的精确、稳定控制提供了参考。

Abstract:

To resolve the problem how to control the pressure in Wind Tunnel using the altitude simulation control system. The control strategy chooses keeping the speed of water ring pump and adjusting the valve using the increment PID control arithmetic according to the characters of system. Because of adopting the increment PID control arithmetic directly, the oscillation time is long, that can not satisfy the requirement of experiment. The reason is analysised, the method that adopting advance adjust on the basis of increment PID control according to the delay and inertial of the system is suggested, then the opportunity and method are defined, at last, system debugging is carried out. The result indicates that, the pressure control can stabilize in ±100 Pa range less than 300 s, it can satisy the requirement of experiment, and provide reference for the stabilization control to the delay and inertial of the system.