Design And Study On Tuned Vibration Absorber Based On Magnetorheological Elastomer

As a simple, stable and low cost device, the dynamic vibration absorber (DVA) has beenextensively used to suppress vibrations of mechanical systems, engineering structures, bridges,buildings etc. However, traditional dynamic vibration absorber is effective only when itsnatural frequency is equivalent to the excitation frequency, hence, it is not suitable forbroadband vibration reduction. To solve this problem, many scholars have studied adaptivedynamic vibration absorber (ADVA) in recent years, which can widen the absorber frequencyrange through tracking external excitation frequency by adjusting structure parameters (andthen natural frequency). As a new smart material, magnetorheological elastomer (MRE) hastypical characteristics of controllable shear modulus. The ADVA based on MRE is studied,which can suppresses vibration of primary system in broadband, has an expansive prospect ofengineering application.The dissertation includes some aspects as follows:(1) The basic principle of DVA is studied by using the motion equation of primarysystem-DVA. The performance of DVA influenced by absorber parameters is studied byMatlab/Simulink, then the design theory and structure parameters optimization theories ofDVA are introduced.(2) The latest progress of MRE is introduced, and the influence of material composition,preparation process, structure characteristics, matrix material and magnetic-particle onmagnetorheological effect are discussed. The relationship between shear modulus and stress/strain is analyzed.(3) The fluid preparation technology and anisotropic method of MRE are determinedbased on the characteristics of preparation technologies, isotropic and anisotropic, then theADVA using shear mode is completed.(4) Simulation model based on MATLAB/Simulink is built to analyse the vibrationreduction performance of the designed MRE absorber in frequency and time domain.Meanwhile, an experiment system is built as while. In the experiment, the ADVA stiffnesscan be changed by controlling the magnetic field which decided by current so that the absorber natural frequency can be adjust. The vibration response in time and frequencydomain of primary system are studied. The results of the response show that the frequencyband of the designed ADVA is widened and the expected design objective is achieved.