The Technology Research Of Accelerometer Structural Topology Optimization

Accelerometers are applied more and more widely in engineering, the acceleration sensor developments are increasingly becoming an important topic. In the design of the sensor, the structural configuration design via which its frequency band width is enlarged and its sensitivity becomes higher,is one of the sensor core technology. An elastomer is the core component of an accelerometer, whose structural parameters directly affect the sensor static and dynamic characteristics.Topology optimization methods are a new type of design methods developed in the past two decades,via which the optimal topology based on design performance requirements is obtained. The current literatures dealing with the acceleration sensor topology optimization is rarely found. To design acceleration sensors by use of topology optimization technology can reduce the product design period and improve its performance.First, the basic principles of the acceleration sensor is introduced, a simplifying theoretical model is given. A structure topology optimization method is introduced, considering the stress constrains. Referring to materials rational fraction model, relations between structural stiffness matrix and topological variables are built. And combining with the measurement of variable stress constraint limits, the minimum weight optimization problem of structural topology with the stress constraints is solved. Hence, the minimum weight optimization method with frequency and stress constraints is proposed.Second, a large number of simulation designs by adopting the proposed method are made. The numerical results verify the correctness and effectiveness of the proposed method, and show that the proposed method is of theoretical and engineering application values. Finally, the optimum topology of a typical sensor elastomer is obtained by using the simulation calculation, and the manufactory of its sample iscompleted. A simple accelerometer is constructed, and its performance experiment is completed. Experimental results show that the proposedmethod can improve the sensor static and dynamic characteristics.