Topology optimization of acoustic radiation of damping plate considering acoustic vibration coupling
In order to reduce sound radiation suppression effect caused by the distribution of damping materials on wheel vibration,this paper presents a topology optimization method of acoustic radiation of damping plate considering acoustic vibration coupling.Taking existing straight spoke plate type wheel damping plate in China as an example,it minimized the sound radiation power under the first-order peak frequency excitation of the damping plate by combination with the sound vibration coupling theory,under the constraint condition of volume fraction of the damping materials.The sensitivity of the objective function under the first-order peak frequency excitation was derived by the direct differentiation method,and the optimal damping configuration was obtained using asymptotic optimization algorithm.The accuracy of calculation was verified by the measured frequency response.The research results show that the amplitude of the vibration frequency response function of a damped wheel is significantly lower than that of a standard wheel throughout the frequency domain.The sound energy levels at 2000 Hz,3150 Hz,and 4000 Hz of a wheel with an optimized damping layout have decreased by 6 dB,5.5 dB,and 2.8 dB respectively compared with that of full coverage,and the maximum sound pressure level in the sound field has decreased by 6.9 dB;Compared with that before optimization,the experimental frequence response at(r,5)has further decreased from 1.76 m/s2 to 0.39 m/s2,and the high-frequency vibration response has weakened.
acoustic vibration couplingdampingtopology optimizationsound radiationsensitivitysound powerobjective functionpeak frequency