Research On The Clamp Design And The Modeling Of A Vibration Generator

The simulation of the vibration test is investigated on a electrodynamic vibration generator by the theories of finite element analysis and the universal software MSC.Patran/MSC.Nastran , on the other hand, the clamp design in the vibration test is investigated in this paper.Firstly, the work principle of the generator and the function of its components are expatiated. The primary characteristic of the generator is analyzed. For example , amplitude-frequency characteristics, thrust, waveform distortion and so on. The finite element modeling of the generator is formed by combine of the numerical modeling and the test modeling based on own configuration. The generator is equivalent to three-dimensional elastomer. The boundary condition of the generator is properly simulated. The modal test is carried out and the result is proved correctly by the method of the modal parameter identification. The finite element modeling of the generator is modified by the results of the modal test. The many kinds of the generator mode are analyzed. The final results shows : the total mass of the modeling is equal to the true mass,the material property is accurate. The modeling result is close to the test results and the maximum relative error is below 5 percent. The first resonance frequency is 2350Hz. The generator modeling is proved reliable by the results.The whole system transmissibility composed of the generator, the clamp and the specimen is deducted by the method of the combination system analysis. The universal clamp is analyzed and is indicated its own applicability. The fabricate method of the clamp is investigated and is compared. Through the analysis of the whole system transmissibility, the influence between the clamp dynamic characteristics and the transmissibility is investigated, A number of clamp design requirements is given. The Quality factor in the resonance and the anti-resonance must be considered coinstantaneous. The clamp design must be first on the clamp, after the clamp and specimen, another the clamp, the specimens and the generator on the order. The optimization of the whole system transmissibility is carried out by the theory of the structure sensitivity analysis. The method is feasible and provides some useful attempts for the clamp dynamic design.