Layered thermal effects dynamic characteristics modeling and application in piezoelectric stack actuator

Abstract Piezoelectric actuators (PA) play an important role in high-frequency actuation scenarios in which their dynamic performance is directly affected by the heat generated by the action and its load changes. This study establishes a layered thermal dynamic model to describe the dynamic behavior of a PA applied to a designed high-frequency valve. First, a dynamic model of a single piezoelectric sheet was established using the generalized Hamilton’s principle, taking into account the thermal piezoelectric coupling effect. Second, a thermal dynamic model considering the boundary condition of the stakes was built by constructing a series quality elasticity model. Because the interaction between stacks affects the dynamic performance of the PA under high-frequency conditions, this study establishes a comprehensive dynamic model of the PA by integrating the piezoelectric layers and external loads. Finally, an experimental test rig is built to verify the effectiveness of the proposed model under real operating conditions. The results indicate that the proposed model more accurately describes the dynamic performance of the PA under high-frequency actuation and thermal change, and showcases the intricate connections between the various components within the actuator system.