Structure Analysis And Optimization Of A Reducer

The function of the reducer, which is the important component of electromechanical actuator, is to change the high rotational speed of the motor to the low rotational speed of the rudder in the missile. With the increasing higher performance of missile weapon system, the reducer is supposed to be miniature and lightweight, and will be suffed from a vile mechanics environment. Therefore it is significant to perform structure analysis and optimum design on the reducer. A ball-screw reducer is considered in this paper. Structure analysis is done for the reducer, and then, the optimum design of the reducer is carried out by using GA and parameterized model. The main work and achievements are summarized as follows:A 3-D finite element model of a ball-screw reducer is established. Many types of connection are simulated precisely. The nonlinear static analysis and dynamical analysis are performed on the reducer with FEA software MSC.Marc/Nastran.Parameterized modeling techniques for the reducer with secondary development tool Patran Command Language (PCL) of MSC.Patran are researched. The parameterized modeling programme of a ball-screw reducer is designed by using PCL. The finite element model can be automatically established with geometric parameters and the processing of analysis and result can also be controlled with corresponding parameters.The implementation techniques of GA are discussed. Taking the minimum weight as objective function, the shape and size optimization of the reducer is executed by using GA and PCL parameterized model established before.In conclusion, the reducer structure optimization by using PCL parameterized modeling technique is successfully executed in this dissertation. The result can be taken as technology instruction to the improving design of the reducer and the method can be applied to similar complex sturcture shape and size optimization conveniently.