Dynamic Optimization of Gyroscope Rubber Vibration Absorber Based on Genetic Algorithm

Along with the rapid development and wide applications of the vibration control theory and technology, higher requirements for the gyroscope rubber vibration absorbers are put forward. In order to design a new gyroscope rubber absorber product satisfying strict constraint conditions of dynamic response under an impulsive load, the method of dynamic optimization should be used. Firstly, taking account of nonlinearity of rubber, the dynamic response of the prototypical absorber under an impact load is analyzed by means of FEA. The analysis shows that the prototype can not satisfy the prescribed dynamic constraint. It also manifests that the layout of supporters has a most influence on the dynamic response. So a dynamic optimization is necessary. Second, in order to improve optimization effectiveness, a necessary simplification to the structure dynamic model is done. The rubber supporter is replaced by a spring, whose force-deflection curve is obtained via a fine and accurate FEA. By doing so, the total nodes of the optimizing model are greatly diminished with little accuracy lost, thus reduce the computation time considerably. Then, taking the maximum deflection angle of the structure under the impact load as the fitness function, the optimum layout of the rubber vibration absorbers model is optimized on base of the genetic algorithm, in which the position of the absorbers are treated as optimization variables. To accomplish this optimization, the C++ codes of the genetic algorithm are completed with object-oriented approach. The codes can access the software ANSYS to utilize its powerful FEA functions. Modal superposition method and Newmark method are used to calculate the dynamic response of the model respectively. Finally optimization results are got, and the dynamic response of the optimized model under the random loads is analyzed.