Control strategy research of the 3-stage electro-hydraulic servo valve controlled hydraulic shaker
LUAN Qiang-li1 CHEN Zhang-wei1 HE Hui-nong2
1.The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; 2.Hangzhou ECON Science and Technology Co., LTD, Hangzhou 310015, China
Abstract:Systematically researched the control strategy of the 3-stage electro-hydraulic servo valve controlled hydraulic shaker, and designed an integrated controller used for the large-flow hydraulic shaker. The controller could simultaneously achieve the servo control and vibration control functions of the hydraulic shaker. In the process of servo control, a dual-PID servo-control strategy was presented for the 3-stage electro-hydraulic servo valve and the servo cylinder. In the process of vibration control, aiming at the good low-frequency characteristics of the hydraulic shaker, a waveform replication method based on the closed-loop iterative control was designed. Through the waveform replication tests with different time histories and different bandwidths on the hydraulic shaker controlled by the integrated controller, it indicates that the controller has a strong waveform control ability to achieve high-precision waveform replication on the hydraulic shaker. Key words: the hydraulic shaker; the 3-stage electro-hydraulic servo valve; seismic waveform replication; road spectrum simulation