High Speed Non-contact Ultrasonic Motor And Applications In Gyroscope

This project was granted by the project of the National Natural Science Foundation of China(No: 11174149).Near-field acoustic levitation has attractive prospects in the non-contact transmission and high-speed driving, which is the one of the hot research home and abroad. For the specific requirements of support system of rotor gyroscopes, piezoelectric actuator based on near field levitation is studied and its application in gyro is researched. Non-contact supporting based on near-field levitation is designed; the mechanism of near-field acoustic induced by structural vibration, and acoustic-piezoelectric coupled finite element analysis is studied. And the levitation ability and driving characteristics are experimentally tested. The cross-domain exploration of piezoelectric precision drive technology, acoustic technology and inertial technology is carried out. The main research achievements were summarized as following:1. According to the current development of the gyroscopes and the existing structure scheme of liquid floated gyroscope,an ultrasonic levitation gyroscope is proposed.The physical nature and dynamic mechanism of the near-field acoustic levitation were analyzed.2. Based on the general working principle of non-contact piezoelectric actuator, a new ultrasonic non-contact gyroscope is designed.Its stator is analyzed in dynamics.Experiment about its suspending and revolving power is conducted on a prototype.3. According to the operational principle of the cylinder-sphere ultrasonic motor,a ultrasonic non-contact gyroscope sharing the same working principle is designed.Experiment including structural design,finite element simulation,etc are also conducted.4. A new method of reading the declination signal of gyros free floater based on the specificity of the driving and supporting principle of Ultrasonic suspended gyroscope is introduced in this paper.The deflection angle of the gyroscope is measured by analyzing pulse signal get from the photoelectric sensor.The scribed line on floater and computational method are introduced.