Research on the theory and simulation of piezo-hydraulic actuator

Piezoelectric stack with its large output force and small displacement, which cannot satisfy the requirement of the opening of the cone valve core of the actual situation. A piezoelectric hydraulic principle of the hydraulic actuators based on displacement amplification was put forward, the output displacement and piezoelectric stack driving volt length, area and enlarge the structure dimension parameters and the load physical function relationship was established. Piezoelectric hydraulic actuator AMESIM model was established and the influence on the output displacement and the driving force factors related to simulation and analysis are carried out, the results show that The area of the piezoelectric stack to the output displacement of piezoelectric hydraulic actuator basic no effect, but with the increase of the area of the maximum output of piezoelectric hydraulic actuator drive also get nonlinear growth. By the increasing the length of the piezoelectric pile to achieve at the same time the output displacement of piezoelectric hydraulic actuator as well as the biggest driving force increases. Given in the piezoelectric hydraulic actuator 60N force, when the drive voltage is 500V, the piezoelectric stack of the response time is about 1.5ms and the piezoelectric hydraulic actuators respond only to 3ms. The simulation experiment indicates that, in the 0 ~ 60HZ simulation interval, the former is better than the latter effect to reduce the vibration, in certain frequency segment, the body vibration suppression ability can be achieved even 6.4 times the latter.