Micro-perforated plate double-layer hierarchical honeycomb sandwich sound absorption bearing composite structure

Abstract

The invention discloses a micro-perforated plate double-layer hierarchical honeycomb sandwich sound absorption bearing composite structure applied to noise reduction of a high-speed train and an airplane body. The micro-perforated plate double-layer hierarchical honeycomb sandwich sound absorption bearing composite structure comprises an upper panel, an upper-layer hierarchical honeycomb, a middlepanel, a lower-layer hierarchical honeycomb and a lower panel. The upper-layer hierarchical honeycomb is placed between the upper panel and the middle panel, and the lower-layer hierarchical honeycomb is placed between the middle panel and the lower panel. Micro through holes are formed in the upper panel and the middle panel, and the hole forming directions are perpendicular to the panels. All the components are connected together through welding or bonding and the like to form an integral structure. During use, the upper panel faces a noise source, and the lower panel backs on to the noisesource. The micro-perforated plate double-layer hierarchical honeycomb sandwich sound absorption bearing composite structure is simple and practical in structure, good in designability and convenientto manufacture, has good medium-low frequency band sound-absorbing performance and excellent mechanical bearing capacity, has the characteristic of light weight, and has practical engineering application value.

Description

technical field [0001] The invention belongs to the field of noise-reducing structure design for high-speed trains and aircraft bodies, which can absorb noise and bear loads, and in particular relates to a sound-absorbing and load-bearing composite structure of a micro-perforated board double-layered honeycomb sandwich core. Background technique [0002] Traditional micro-perforated sound-absorbing panels are made by drilling small holes with a diameter of less than 1mm on a thin plate. They are only used as sound-absorbing decorations in concert halls, museums, conference rooms and other indoor environments. as a load bearing component. Moreover, the single-layer micro-perforated plate has only one sound absorption peak, so it cannot be used as a general sound absorption structure in a wide frequency band. For the noise reduction of high-speed trains and aircraft, micro-perforated panels cannot meet the requirements in terms of sound absorption effect and bearing capacity....

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of insufficient sound absorption performance and bearing capacity of existing micro-perforated plates, and to provide a sound-absorbing sound-absorbing micro-perforated plate with a double-layered honeycomb core that is simple in structure and easy to process while absorbing sound. load bearing composite structure

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