Middle-low frequency sound insulation and heat insulation composite wall plate

Abstract

The invention discloses a middle-low frequency sound insulation and heat insulation composite wall plate which comprises a shell, a heat insulation and sound absorption layer and a combined plate which are connected with one another in sequence from outside to inside, wherein the combined plate consists of two first coupling vibration plates and a first sound absorption material arranged between the two first coupling vibration plates. To solve the problem that the conventional light-weight and thin sound insulation material cannot effectively insulate middle-low frequency noise, the middle-low frequency sound insulation and heat insulation composite wall plate adopts the coupling vibration plates, so that near field waves produced by the coupling vibration plates can repeatedly penetrate through the sound absorption material, and a large amount of sound energy is consumed; by virtue of the arrangement of distances between the coupling vibration plates and the shell, the performance of a sound insulation spectrum curve near to peaks and valleys can be improved; therefore, the middle-low frequency sound insulation and heat insulation composite wall plate has a better sound insulation effect in the whole middle-low frequency region; furthermore, under a condition that only the shell exists near to the peak frequency of a sound insulation amount, the sound insulation amount can be increased by about 25dB. The quality areal density of the middle-low frequency sound insulation and heat insulation composite wall plate is about 5.5kg/m<2>, so that the middle-low frequency sound insulation and heat insulation composite wall plate is suitable for being used as cabin wall plates of an airplane, a high-speed train and the like.

Description

technical field [0001] The invention relates to a sound-insulation and heat-insulation composite wallboard, in particular to a medium-low frequency sound-insulation and heat-insulation composite wallboard. Background technique [0002] Large-scale vehicles, such as spaceships, airplanes, trains, ships, automobiles, etc., are usually equipped with powerful power equipment and travel at a high speed. Therefore, on the one hand, the power equipment generates vibration and noise; on the other hand, the relative movement between the outer shell of the vehicle and the external carrier medium also generates vibration and noise. In order to improve the working efficiency of the vehicle, increasing the speed and reducing the energy consumption is the development direction of the vehicle, which makes the vehicle more powerful and the structure thinner, resulting in more serious vibration and noise problems. Passengers in the cabin want a quieter journey. Therefore, it is required th...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the traditional light and thin wall panels cannot isolate the vibration noise of the medium and low frequency (100-1000Hz), the present invention provides a medium and low frequency sound insulation and heat insulation composite wall panel, which can effectively absorb the medium and low frequency sound energy above 100Hz, thereby effectively isolating the outside noise

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