Mechanism Of Acoustic Levitation And Reducing Fraction Analysis And Basic Experimental Study On The Ultrasonic Bearing

Bearing is the key component in the mechanical equipment. The function of bearing is to support the shaft and parts on the shaft and transfer movement and power. The rotating precision of shafting and performance of whole machine are affected by the bearing. With the development of modern manufacturing technology, the non-contacted and high rotating bearing is becoming a new study field. This paper presented a new idea, ultrasonic bearing, and carries out its relative theory and experiment study according to the ultrasonic, vibration and friction theories. The dissertation consists of several parts, the details as follows: (1) Based on the study of domestic and oversea scholars, the necessary condition of producing acoustic levitation is analyzed further and the relative theories of piezoelectricity , the ultrasonic and vibration are studied. It describes the mechanism of ultrasonic vibration for reducing friction and acoustic levitation and the feasibility of constructing acoustic levitation support of bearing by ultrasonic vibration. The performance of key components forming ultrasonic reducing friction acoustic Levitation, piezoelectric ceramic actuator, is analyzed largely in theory and test. Build the vibration equation of piezoelectric ceramic actuator and determine the size of piezoelectric ceramic actuator by boundary conditions. Design and fabricate the piezoelectric ceramic actuator and test the basic vibration parameters, such as the impedances of the actuator and resonance frequency. Analyze the vibration mode of the actuator by FEM and make the actuator...