That is, suppressing and rearranging the cavity modes simultaneously achieves the suppression of the base plate modes. Consequently, the main differences of the control mechanism, when compared with the single ribbed case, lie in two aspects. One cavity mode can couple with and transmit sound energy to any type of base plate mode of the radiating ribbed plate. For the orthogonally two ribs stiffened case, four different cluster mode groups can be coupled with each other, due to the interlaced coupling effects of the horizontal and vertical ribs. This is the continued work of the single rib stiffened case. Physical mechanisms of active control of sound transmission through orthogonally two ribs stiffened double-panel structure are investigated.
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