Study On Topology Optimization Design Of Piezoelectric Vibrator Using Composite Vibration Mode

In recent years,more and more attention has been paid to the intelligent manufacturing industry,and higher requirements have been put forward for the positioning accuracy of various automatic control systems.Therefore,the traditional motor is far from meeting the requirements of modern control system,and the linear ultrasonic motor gradually replaces the electromagnetic motor due to its advantages of high positioning accuracy,large self-locking force and flexible structure.At present,the design method of ultrasonic motor is mainly size optimization.In this paper,the topology optimization method will be used to design the structure of several piezoelectric actuators,expand the design factors of the main structure,make the design process more efficient and improve the performance of the motor.Based on the requirements of the macro micro combined motion platform,this paper designs a micro plate linear ultrasonic motor,and carries out the topology optimization analysis of its structure;then,through the finite element software,analyzes the prototype and the topology optimized motor;finally,carries out the mechanical performance comparison experiment between the prototype and the topology optimized motor,the experimental results show that the topology optimized motor is adopted The output force of the machine is increased by 33 % and the speed is increased by 20 %.In this paper,a kind of plate type quadruped linear ultrasonic motor is proposed,which uses the superposition and coupling of the first-order longitudinal vibration and the antisymmetric bending vibration of the rectangular plate.The feasibility of the working principle of the motor is analyzed and verified by the finite element software.Finally,the mechanical performance of the motor is tested,and the maximum output force of the motor is 3.4N.In this paper,a piezoelectric robot is designed,which uses topology optimization to control frequency.After the experiment,it is measured that when the excitation frequency is in the range of28.73-29.54 khz,the robot can move in a straight line,and when the excitation frequency is in the range of 31.9-32.68 khz,the robot can rotate around its center.