Characteristic Analysis Of Magnetorheological Fluid Under Ultrasonic Field And Application

Attitude control and regulation is one of the key technologies to ensure the normal operation of various flight carriers.In this thesis,combining with the rheological properties of magnetorheological fluid(MRF)which can be changed rapidly under certain conditions,a ultrasonic levitation type actuator based on MRF medium was proposed for the speed control of guided projectile with the fixed canard and the attitude regulation mechanism for microsatellites.The mechanism of shear characteristics of MRF under ultrasonic field,the design of new MRF damper and the experimental study of system integration were carried out.The main contents of this study are as follows:1.The background of the techniques of attitude regulation and trajectory control of guided carriers such as guided projectiles and satellites was introducted,and the research status of attitude control technology used in flight carriers at home and abroad was described.The basic principle of near-field ultrasonic levitation and its applications in non-contact piezoelectric actuators were demonstrated.The research status of characteristics of the MRF under coupled multi physical fields was also analyzed.2.The MRF's composition,rheological mechanism,constitutive model,working mode and existing device structure were summarized.The basic model of the force analysis of MRF particles under non sound field was derived.The antifriction mechanism of the MRF particle chain was analyzed.The cross-scale shear model of the MRF under acoustic-magnetic coupling was established,and the macroscopic damping calculation was carried out in combination with the MRF disc shear mode.3.The principle of MRF shear test under the effect of ultrasonic field was clarified.A ring-slot type MRF shearing test bench with a chip-type piezoelectric stator was designed,and the waveform excitation principle of the disk-shaped piezoelectric stator was clarified.The disk type MRF shearing test bench with piezoelectric transducer was improved to solve the problem sealing of the previous scheme.The MRF experimental system under the effect of ultrasonic field was built,and the MRF shear experiments was carried out.4.Based on the chip-type piezoelectric stator and piezoelectric transducer,two MRF dampers were designed from the two aspects of piezoelectric stator dynamics and magnetic circuits,and the vibration experiments were carried out.Integration test was conducted for steering gear control of a certain type of high-rotation guided projectile.The feasibility of steering speed regulation by MRF and ultrasonic suspension actuator was preliminarily verified.5.The design scheme of attitude regulation mechanism based the MRF under the effect of acoustic-magnetic coupling was proposed.The dynamics design of the conical stator and the acoustic field analysis in the air medium were carried out.The prototype and the performance test system were built.The stator vibration experiment,levitation and drive capability in air medium test were conducted.This laid the foundation for the attitude adjustment system applied to microsatellites.