问题描述：
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As examples,the resonances near 121 and 240 Hz are caused by the 1st and 2nd wave modes of the air in the vertical dimension of the van’s interior cavity.Engine orders 1,2,3,3.5,4 and 6 are all present,and coincide with some of the predicted cavity mode frequencies at this engine speed.
As examples,the resonances near 121 and 240 Hz are caused by the 1st and 2nd wave modes of the air in the vertical dimension of the van’s interior cavity.Engine orders 1,2,3,3.5,4 and 6 are all present,and coincide with some of the predicted cavity mode frequencies at this engine speed.
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