Body Structure Prediction and Analysis of Noise

Taking a passenger car as the research object, the integrated use of experimental modal analysis and finite element techniques, the dynamic characteristics of the body structure and interior sound field research carried out. At the same time the body topology optimization model, exploring the structural optimization to reduce the feasibility of vibration and noise. First, in the UG in the establishment of the geometric model of passenger cars, and the division of the grid by the finite element model of the body. Finite element analysis software ANSYS finite element model of the vehicle body modal analysis, and the results compared with experimental modal data, verify the accuracy of the finite element model was built. Secondly, the finite element model in ANSYS was harmonic analysis and transient response analysis. While building the body boundary element model and boundary element model car tune, the sound of these two model coupling calculation, take the room key points obtained sound pressure level spectrum. Defined body structure in the excitation of the response and sound pressure distribution of the indoor ride and to provide a reference for further optimization. Finally, in the HyperWorks conducted a modal analysis, modal analysis results, optimization of the HyperWorks body structure in the topological model based on the optimized structure, the key point of riding the indoor sound pressure level, confirming optimization model helps reduce the vibration noise. 

Keywords: finite element method, acoustic coupling, topology optimization, the first order frequency