通过平均声压级和声功率级的测试验证了复合钢板试制的油底壳的降噪效果。
With the measurement of average sound pressure level and sound power level, the noise reduction result of the oil pan made by sandwich steel plate was proved.
得出，当激振点不变时，激振力级的变化与振动模态辐射的平均声压级成线性关系；
When the exciting force was constant the average level of sound radiation produced by modal vibration has a linear relationship with the level of mode shapes.
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