tailieunhanh - Control of structural acoustic radiation based on topography optimization

The optimization software Altair OptiStruct is used to optimize the design of folded plate structures. Numerical results show that the acoustic radiation power of folded plate structures can be significantly reduced by topography optimization. | Journal of Automation and Control Engineering Vol. 3, No. 3, June 2015 Control of Structural Acoustic Radiation Based on Topography Optimization Chu. Khac Trung Hunan University, Changsha 410082-China. Hanoi University of Industry – Viet Nam E-mail: trungchukhac@ Yu. Dejie Hunan University, Changsha 410082-China. E-mail: djyu@ Abstract-Structural acoustic radiation controlling is very important for noise reduction. To minimize the acoustic radiation of folded plates, a topography optimization method is proposed in this paper. In the proposed method, the structural vibration characteristics of a folded plate structure are analyzed by using of FEM. Then the structural acoustic radiation is analyzed by using Helmholtz integral method. The natural frequency of the first mode shape of the folded plate structure is taken as the objective function. The average value of acoustic radiation power in the analysis frequency band can be minimized by maximizing the natural frequency of the first mode of the folded plate structure. The optimization software Altair OptiStruct is used to optimize the design of folded plate structures. Numerical results show that the acoustic radiation power of folded plate structures can be significantly reduced by topography optimization. Index Terms—finite element method (FEM); boundary element method (BEM); structural acoustic radiation; topography optimization; folded plate structures. I. INTRODUTION In the latest several decades, NVH (Noise-Vibration-Harshness) has become an important indicator of quality and comfort of cars. The structural acoustic performance of a car becomes an important issue in the design process. In car structures, the vibration of plates is not self-generated, but passed from the frame structure. Thus, the frame structure of a car is the important source of vibration and noise. The purpose of this paper is to show the feasibility of the folded plate design optimization to minimize the .