|M.Sc Student||Maccabi Nadav|
|Subject||Enhancing the Functionality of Unimorph Piazoelectric|
|Department||Department of Mechanical Engineering||Supervisor||Professor David Elata|
|Full Thesis text|
This work focuses on novel implementations of piezoelectric actuation for various applications. For the first time, a piezoelectric actuator that responds in pure torsion is shown, using novel actuation schemes and IDE (inter-digitated electrode) orientations. Using the recently presented IDE bulk actuation method, novel concepts of bulk actuation were developed in this work. In the recently presented bulk actuation method, the IDEs designed for the test devices were oriented at 90 degrees relative to the actuator centerline. In this work, we show that orienting the IDEs at 45 degrees induces a combined bending and torsional response, whereas orienting IDEs at 90 degrees induces a pure bending response. Based on this newly developed actuation method, two primary actuator types were designed. One actuator type is designed for combined bending and torsional response, and the other is designed for piston-motion response. In addition, these actuators can be actuated in bending or torsional modes, without changing the geometry of the devices after fabrication, simply by changing the input voltage scheme. Similarly, piston-motion actuators based on the torsional response were designed. A cost-efficient fabrication process of these actuators was developed, and the devices were characterized in both quasi-static and dynamic experiments. The influence of several parameters on the response of these actuators was explored.