Definition of double-layer sound insulation structure

According to the law of mass, the frequency is reduced by half, and the transmission loss is reduced by 6 dB. When the sound insulation effect is improved, the mass is doubled and the transmission loss is increased by 6 dB. Under the control of this law, if the sound insulation ability is to be significantly improved, it is obviously impossible to increase the quality of the partition, such as increasing the thickness of the wall, sometimes it is impossible, such as the sound insulation structure on the aircraft. . At this time, the solution is mainly to use a double layer or even a multilayer sound insulation structure.
The model of the double-layer sound insulation structure is shown in Fig. 8. The mass per unit area is m1 and m2, and the thickness of the middle air layer is L. The transmission loss of the two-layer structure can be theoretically calculated, and the results are more complicated. Different simplified representations can be obtained in different frequency ranges, which are only qualitatively introduced here. China Home Theater Network

Generally, two layers of double-layer sound insulation structure do not use the same material of the same thickness to avoid the same frequency of matching between the two layers.

Special care must be taken during design and construction to ensure that there is no rigid connection between the two layers. Destroyed the solid-air-solid two-layer structure, the two layers of solid barriers are connected by rigid members, so that the vibration of the two compartments are connected together, and the sound insulation is greatly reduced. Especially for double-layer light structure sound insulation, when they must support or connect each other, they must be supported or suspended by elastic members, and at the same time, note that there is no seam or hole communication between the two spaces that need to be divided. The “leakage” will leak sound, which is the actual problem of sound insulation.

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