Design of Digital Hydraulic Transformer and Experimental Research on Its Steady State Characteristics

A digital hydraulic transformer（DHT） is proposed,which combines multiple binary displacement ratio pump/motor flow units together and uses a mechanical connection to make them rotate synchronously.A high-speed on-off valve group is connected to the inlet and outlet of each flow unit,and the on-off state of each valve group corresponds to a binary number.By controlling the digital status of the inlet and outlet valve groups,different transformation ratios can be adjusted to achieve different pressure output.According to the working principle of DHT,the structural design and mathematical modeling were performed,and a prototype was manufactured.Finally,a test platform is built to verify its steady state characteristics.The results show that the proposed digital hydraulic transformer can change its voltage with the change of digital control quantity,which verifies the feasibility and practicability of its voltage transformation principle.DHT has the characteristics of discrete digital components,simple and easy t