抄録
A novel hydraulic actuator with built-in compound control function of displacement and thrust, and a method to improve the dynamic performance of an actuator were studied. Fundamental experiments and numerical analysis were conducted to examine the dynamic characteristics of the prototype hydraulic actuator. A sleeve orifice was introduced to improve the response of spool valve and a cylinder orifice was introduced to improve stability of the system, then their effectiveness was investigated by simulation study. From the experimental results with orifices, it was confirmed that the response of spool valve in thrust and displacement control and the stability of the system in displacement control were improved by orifices. Furthermore, the experimental results showed that adjusting the orifices was also effective in improving precision of the hydraulic actuator.
