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Study on Dynamic Properties of SALiM Shock Absorber

Author: ZhangCuiXia
Tutor: ChenQian
School: Nanjing University of Aeronautics and Astronautics
Course: Engineering Mechanics
Keywords: Mixed media Buffer Nonlinear stiffness Power spectrum Vibration Control
CLC: V228.1
Type: Master's thesis
Year: 2009
Downloads: 15
Quote: 0
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Abstract


Cushioning technology for national defense , aerospace technology research and industrial technology, further development are of great significance. At present , the buffer has a lot of species, but there are still many problems. This article presents a nonlinear SALiM mixed media buffer concept , the movement response can be accurately calculated by the formula , which can be simply mixed media replacement , good cushioning effect , especially suitable for heavy equipment buffering. This design consists of mixed media buffer piston , cylinder , aviation oil and hollow rubber ball composition . Mixed media for buffering is a new technology , and its principle of model structure and the buffer is extremely complicated, so the use of theoretical and experimental analysis of two methods . First expounded buffer can reduce the impact force to absorb impact energy as well as the basic principles of the main performance parameters of the buffer and its evaluation . Application of nonlinear continuum theory of nonlinear stiffness characteristics of the buffer , resulting in buffer theoretical stiffness model and analyze various parameters on the stiffness of the theory . Subsequent tests on the stiffness of the accuracy of the model was tested to determine the damping models and identify the parameters of the model . Thus, the new mixed media buffer complete theoretical model can be established . Through theoretical analysis showed that the acceleration response buffer with many parameters, using simulink simulation analysis of these parameters on the shock acceleration response of the power spectrum of mixed media buffers , shock and cushion the effects of spectral theory . In different experimental conditions validate theoretical models stiffness formulas and buffers the accuracy of analysis buffer dynamics. From the above analysis : Buffer stiffness formulas accurately , model structure is reasonable ; buffers acceleration response with the increasing number of small balls , material hardness decreases and the initial internal pressure decreases with increasing ; buffers exhibit soft spring characteristics , properly designed, can achieve a good cushioning effect .

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