Piezoeletric Actuators Based On Near-field Levitation And Applications In Gyroscope

This project was granted by the project of the National Natural Science Foundation of China (No:11174149) and Aviation Science Foundation (No.2011ZC52035).Near-field acoustic levitation is an interesting physical mechanism; it has attractive prospects inthe non-contact transmission and high-speed driving, which is the one of the hot research home andabroad. For the specific requirements of support system of rotor gyroscopes, piezoelectric actuatorbased on near field levitation is studied and its application in gyro is researched. Non-contactsupporting based on near-field levitation is designed; the mechanism of near-field acoustic induced bystructural vibration, and acoustic-piezoelectric coupled finite element analysis is studied. And thelevitation ability and driving characteristics are experimentally tested. The cross-domain explorationof piezoelectric precision drive technology, acoustic technology and inertial technology is carried out.The main research achievements were summarized as follows:1. According to the current development of the gyroscopes and the existing structure schemeof liquid floated gyroscope, proposed an ultrasonic levitation gyroscope.The physical nature anddynamic mechanism of the near-field acoustic levitation were analyized.2. A cylindrical stator and two stators baesd on the mechanism of near-field levitation areproposed, they are the main parts of the levitation supporting system. Detailed analysis on workingprinciple is carried out, and the the dynamic analysis and polarization scheme are conducted.3. An acoustic-piezoelectric coupled finite element model is established on the core componentof the levitation system of the ultrasonic. The acoustic radiation force of the cylinder stator iscalculated based on the formular of energy method. The relationship between excitation voltage andthe acoustic radiation force is carried out, provides a theoretical basis for the gyroscope.4. Prototypes of the stators are manufactured, a test platform is built and modal test of the statorsis carried out. The levitation ability is carried out on the cylinder stator; the results illustrate theworking ability of the levitation system.5. Non-contact ultrasonic motors based on ultrasonic levitation and driving ability are proposed,dynamic analysis are carried out on the stators, modal test are conducted on protypes.The levitationability and rotation characteristics are tested, the rotation speed can reach2600rpm.