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To study the car radiated noise caused by turbulent pressure fluctuation on the side glass under wind excitation, a clay model of DrivAer was constructed except that the front left side window was built with real glass. Firstly, the constraint boundary condition of the side glass was set equivalent to a series of springs for the modelling with Finite Element Method (FEM). Then, a platform based on Matlab-Abaqus cosimulation was originally developed, and the genetic algorithm was applied to find out the best fitted spring stiffness, which was used to build the equivalent model. Then working as excitation, the Corcos model was applied to calculate the power spectrum density of the turbulence pressure fluctuations acting on the side glass. Subsequently, the finite element modal superposition method was used to solve the vibroacoustic coupling equation to get the noise level of the driver’s ear position in the vehicle interior. Finally, the surface vibration velocity distribution of side glass under wind excitation was measured with Laser Vibrometer and then with Boundary Element Method (BEM), the radiated noise into interior was calculated as well (semisimulation). Through comparison of these two results, it shows good agreement up to 1000 Hz. It demonstrates that the above method is applicable to calculate the sound radiation caused by the side glass’ vibration at the low and middle frequency range. Therefore, an approach of calculating sound radiation of a vibrating glass caused by the air convective pressure fluctuation was explored.

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Abstract. In order to study the vibration response of automobile front side window glass at high speed, its constraint condition must be determined at first. However, it is difficult to establish the boundary constraint model of the window system due to the complicated mechanical properties and the irregular shape of the side window glass seal. In this paper, a front left side window of a sedan was taken as a model. An equivalent discrete model of side window glass seal was established based on equivalent principle, by which the window seal is equivalent to series of spring constraint. Then the Matlab-Abaqus co-simulation optimization platform was set up and Python language scripts was used to make secondary development of Abaqus software. The natural frequencies of the side window glass obtained by the modal test are taken as the objective function. By fitting the stiffness of the springs, the most suitable constraint condition of the side window glass for the actual situation was obtained. Through comparing the results with simulation and experiment, the first four natural frequencies and mode shapes of the side glass are in good agreement, which verifies the effectiveness of the glass seal system discretization model by equivalent springs.