Modeling and Analysis of Hydraulic Controlled Rotary Valve Excitation System

Hydraulic controlled rotary valve excitation system mainly includes the hydraulic controlled rotary valve and micro-displacement double-functioned hydraulic cylinder. This system takes hydraulic pressure source to drive the spool to rotate, makes ports A and B of the hydraulic controlled rotary valve to switch in a high speed, and realizes reciprocating movement of the micro-displacement double-functioned hydraulic cylinder. A numerical simulation model of the system is established using AMESim ^®. The effectiveness of the model is verified by comparing with the experimental test results. Simulation runs are carried out with reasonable internal parameters and external conditions encountered in real working environments, the results show that: in the steady-state, the pressure and flow waveforms of two chambers of the micro-displacement double-functioned hydraulic cylinder are symmetrical to each other, and the phase difference is about 0.002 s. As soon as the rotary valve reverses, the valve port flow will increase significantly, and such instantaneous flow will exceed the system oil supply flow even after several times, which can momentarily lead to a strong hydraulic impact; adding different loads affect the steady working point of the hydraulic cylinder, i.e., the larger the load capacity is, the larger the hydraulic cylinder’s steady working point offset to the no-load working point will be, and vibration waveforms under different loads are close in amplitude and phase.