Experimental research on modeling and control algorithm of high-precisiondynamic loading device
In this article,in order to design a dynamic force-loading device with the full static accuracy of less than 0.05％FS and the dynamic accuracy of less than l％FS,in the absence of any matched pressure-typed electro-hydraulic servo valve,the flow-typed electro-hydraulic servo valve is used to design the dynamic loading device's hydraulic pressure system,and then the experimental research is conducted on the control algorithm of high-precision dynamic loading.It is shown that when the tradition-al PID is used to control the loading force,the static accuracy reaches 0.041％FS while the dynamic accuracy reaches 2.5％FS,both exceeding the control requirement of the dynamic loading device.When the self-adaptive PID is used to control the loading force,the static accuracy reaches 0.039％FS while the dynamic accuracy of the loading force in the middle stage of force applica-tion reaches 1％FS;however,in the initial and end stages of force application,the dynamic accuracy of the loading force is as high as 8％FS.Since the loading force has different characteristics in these stages,a segmented self-adaptive PID control algo-rithm is proposed.The test on the dynamic loading force demonstrates that the segmented self-adaptive PID algorithm is helpful to solve the problem that the dynamic accuracy of the loading force exceeds the tolerance.The static accuracy of the loading force is controlled at 0.018％FS while the dynamic accuracy is controlled at l％FS,which fully meets the control requirement of such high-precision dynamic loading devices.
NETL
NSTL
万方数据
