Dynamic Analysis Of The Camera Structure With A Rubber Shock Absorber

With the continuous development of aerospace technology, the rubber shock absorber has been widely used in various instruments in order to improve the vibration resistance. The performance of the rubber shock absorber is judged by the structure response under the dynamic load. Therefore, the dynamic analysis of structures is very important. In this paper, on the basis of the structure analysis theory, the rubber shock absorber related theory and the finite element analysis methods, for an example of the camera with a rubber shock absorber, the finite element dynamic analysis is carried out.Firstly, based on the concept of shock response spectrum (SRS) and the SRS time-history synthesis principle, an effective SRS time-history synthesis method is presented by chosen the Sin Window Function Waveform which is one type of the synthesis waveforms as the basic waveform. And a vibration environment is converted into input date for FEM software by this method.Secondly, the mechanical constants C₁ and C₂ of the rubber Mooney-Rivlin model which is widely used in FEM software are determined. The sum of C₁ and C₂ is derived by the rubber hardness. According to the nonlinear finite element method, the rubber compression load-deformation curves are simulated under different C₂ C₁ and compared with the measured curve to make the values of C₁ and C₂ determined.Finally, the finite element model of the camera is established, and the modal analysis, the harmonic analysis, the transient analysis and the random analysis are carried out by using the FEM software. The results show that the response does coincide with the actual conditions and illustrate the effectiveness of the rubber shock absorber in the camera.