Precise control is a key requirement in modern hydraulic systems, where high repeatability, fast response, and reliability are essential. These characteristics are currently achieved primarily through the use of high-dynamic proportional or servo valves, which represent compact but complex and costly components. Research has demonstrated the high potential of piezo actuators for integration into hydraulic valves due to their extremely fast response times, micrometer-level precision, and high energy efficiency.
The thesis focuses on the development and construction of a piezo actuator system that can be applied to a conventional seat valve and serve as a replacement for electromagnetic actuators. The work includes the presentation of the theoretical background, the selection of piezo actuators, and the definition of suitable seat valves. We design the integration of the piezo actuator into the housing, its preloading and control, and prepare a 3D model of the prototype as well as manufacture its components. In addition, we develop a test rig and plan the experiments. The functionality of the control electronics and the piezo actuator system is verified, with an emphasis on static characteristics, namely the displacement of the piezo actuator system at different control voltages. Finally, the linearity of the displacement and the hysteresis are evaluated. All signal generation code was written in the Python programming language, and all measurements were carried out using measuring equipment provided by company Paternoster d.o.o.
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