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建立了双层铝合金型材与声场高频振动的统计能量分析(statistical energy analysis-SEA)模型,以动力学力激励作为系统的能量输入,计算了铝合金型材和声场的动力学响应,比较了不同板厚度、位置对振动速度和对声场声压级的影响,计算表明靠近载荷的子系统具有更大的振动速度,板越薄振动速度越大,声场声压级越高,板厚度每减小0.5 mm声场声压级增加约1 dB.研究结果表明,统计能量法可有效计算铝合金型材的高频振动噪声,研究对基于统计能量的整车高频声振分析有重要意义.
The statistical energy analysis (SEA) model of double-layer aluminum alloy profile and high-frequency vibration of sound field was established. The dynamic response of aluminum profile and sound field was calculated by using dynamic force excitation as the system energy input. The influence of plate thickness and position on the vibration speed and the sound pressure level of the sound field is calculated. The calculation shows that the subsystems close to the load have a greater vibration velocity. The thinner the plate, the greater the vibration velocity and the higher the sound pressure level, The sound pressure level of 0.5 mm increases about 1 dB. The results show that the statistical energy method can effectively calculate the high frequency vibration noise of aluminum alloy profiles, and the research is of great significance to the high-frequency acoustic vibration analysis of vehicle based on statistical energy.