Study On Ultrasonic Suspension Mechanism In Vibration Suppression Of Rotor System

To improve efficiency, modern rotating machinery gap between the stator turn smaller and smaller, and thus may be transferred stator contact and friction in operation. Here, said stator contact transfer site for the rotation of the contact surface. Friction between the contact surfaces can cause wear and heat generated between the contact surfaces, causing great harm to the rotor system. With more and more high speed rotating machinery work, harm caused by friction will be more prominent. In recent years, the suspension and the effect of ultrasonic vibration caused by friction as a novel method for reducing friction widespread attention. When two objects come into contact, if applied to one surface of the ultrasonic vibration is generated near-field acoustic levitation force makes an object from another object, thus avoiding friction and ultrasonic units can produce near-field ultrasonic levitation force behind capacity, while much larger than the other way air suspension, suspension and other light. Using ultrasonic suspension friction of rotating machinery other agencies to achieve a variety of common faults such as imbalance, misalignment moderate control or suppression.This paper studies the ability of ultrasonic gas squeeze film suspended starting to squeeze film Reynolds equations based on ultrasound. And ultrasonic squeeze film force eccentric rotor unbalance vibration suppression for the study. Using micro-element method for solving second-order approximation method, high-order finite difference method, Newmark-β and Newton-Raphson method of simulation and modeling experiments with a combination of approaches. Ultrasonic squeeze film friction and suspension characteristics of theoretical and experimental research, while the use of ultrasonic non-contact force film extrusion rotor unbalance vibration suppression depth study. The main work of this paper include the following aspects:First, analytical solutions for the numerical solution of two ways to solve the ultrasound squeeze film, the main departure from the principle of ultrasonic gas squeeze film lubrication theory calculations. From the perspective of the micro-element method for viscous fluid dynamics to solve the continuity equation can be simplified, using second-order approximation method to solve the analytical solution gas squeeze film, and the use of finite difference method for ultrasonic pressure membrane Reynolds equation can be simplified to solve. By solving the analysis of the gas squeeze film levitation force and suspension clearance, ultrasonic amplitude, pressure, ultrasonic frequency, the contact surface of the transducer size and other factors.Secondly, the use of finite difference method concave gas-lubricated Reynolds equation to calculate the hydrostatic squeeze film suspended concave supporting force. Study of the relationship between the concave surface of the membrane support squeeze film gap with the pressing force, the amplitude of ultrasound, ultrasonic frequency. Rotor dynamic pressure ultrasonic gas squeeze film theoretical analysis, by simplifying Reynolds equation, using analytical calculation method proposed combining the experimental approach to computing. Ultrasound squeeze calculation of hydrodynamic loads and provide a theoretical basis for the film.Then, by using the Newmark-β and the Newton-Raphson method for solving nonlinear rotor system, and through the eccentric rotor system simulation, using ultrasonic squeeze film force to suppress the vibration of rotor unbalance. The use of ultrasound to squeeze film inside the compressor, the model simulation to solve.Finally, the suspension friction and suspension clearance to do experimental research, design and installation of the entire ultrasonic bench, including (shock base, ultrasonic transducers, ultrasonic generator, Rally, Vibration measurer). Suspension performance ultrasonic extrusion films were studied experimentally. Experiment from two aspects, experimental study on the performance of the film plane suspended ultrasound squeeze, squeeze film of suspension performance concave ultrasound study. Friction properties of ultrasound for the experimental study.