Numerical Analysis Of Oil Testing Pipe Shock Absorber System Under Impact Load

Dynamic character of oil testing pipe shock absorber system under impact load were searched which were based on finite element analysis software ANSYS in this paper. Geometry nonlinear and material nonlinear and state nonlinear and dynamic load are involved in simulate course. Several aspects are discussed in this paper: 3D finite element model of new designed shock absorber and local shock absorber former used are established and simulated accurate by LS-DYNA, the effect of shock absorber impact by half sinusoidal pulse force under three different main lobe frequency are discussed, the effect of these two shock absorber are compared too. Under a fix impact strength and 150Hz pulse force main lobe frequency ,the new type of shock absorber model are simulate analyzed by change spring rigidity,rubber Mooney-Rivlin parameter,dynamic rub parameter of rubber and outer cannula,the quantity of under tie-in, shock absorber effect are discussed also. Simulation analyze under changing working environment are discussed to new type of shock absorber model. The affect of system shock absorber are also part-discussed by changing impact strength of pulse force and impact waveform. Twenty four groups of different structural parameters of the new type of shock absorber by adopting uniform design method. A 3D finite element analysis model was established, the maximum displacement and the maximum soil-structure perturbation force distribution of the shock absorber system were calculated with LS-DYNA. Finally the multivariate linear regression was performed on the maximum displacement and the maximum soil-structure perturbation force. The fitting property of the maximum displacement and the maximum soil-structure perturbation force with seven influence factors was obtained. By doing signal input and output attenuation experiment to long and short shocker absorber of xi'an 213 graduate school and new type of shock absorber, we then compared with shock absorber coefficient. Under simulation working environment, three different frequency transient oscillate mode excitation to shock absorber, the result of experiment indicate that the effect of new type of shock absorber are obvious better than the long and short shock absorber of 213 graduate school, especially in high frequency channel. Then new type of shock absorber are simulate analyzed and compared with experiment result. By discussing the relative of the structure of shock absorber and shock absorber capability index in this paper, we approve that it not only can replace large numbers of experiment, but also present reference opinions to shock absorber design on theory.