Research On Ultrasonic Suspended Gyroscope Dynamic Design And Experimental Study With Spherical Rotor

This project was granted by the project of the National Natural Science Foundation of China (No:11174149) and Nanjing University of Aeronautics&Astronautics basic scientific research expensesspecial scientific research fund project (No: NJ2011001) and The Second Batch of2010GraduateInnovation Base (LAB) for the Nanjing University of Aeronautics and Astronautics (Has beensuccessfully finished, evaluation result was excellent).This paper focus on the theme of innovative application in spherical rotor with near-fieldultrasonic levitation and drive technology, new spherical rotor in non-contact piezoelectric actuatordesign, the mechanism of near-field acoustic induced by structural vibration, structural-acousticcoupled model and the prototype of the suspension and the driving characteristics were studied. Themain research achievements were summarized as follows:1. Analysis the physical nature and dynamic mechanism of the near-field acoustic levitation,depend on the current development status of the mechanical rotor gyroscope, proposed a near-fieldacoustic applied to gyroscope support and drive, and gives the ultrasonic suspended gyroscopedefinition and the methods of posture detection.2. Proposed three non-contact piezoelectric actuators can be used to build ultrasonic suspendedgyroscope: a bowl-type piezoelectric actuator and axial/radial coupling type piezoelectric actuatorand piezoelectric ball type actuator. Detailed analysis three kinds of actuator working principle andhas carried on the dynamic analysis and electric excitation mode design.3. Established structural-acoustic coupled model of the bowl-type piezoelectric actuator andaxial/radial coupling type piezoelectric actuator, deeply analyzed mechanism of the near-fieldacoustic induced by structure vibration, for ultrasonic suspended gyroscope system design andanalysis to lay the foundation..4. Making a bowl-type of piezoelectric actuator and axial/radial coupling type piezoelectricactuator prototype, built a test platform, contucted modal, suspension and speed characteristic tests. Inaccordance with the tests carried out further structure improvement and optimization design. Theexperimental results demonstrate that the two scheme prototype successfully levitate and drive thespherical rotor, and speed achieved thousands per minute.