Micro-perforated plate cobweb honeycomb sandwich sound absorption bearing composite structure

Abstract

The invention provides a micro-perforated plate cobweb honeycomb sandwich sound absorption bearing composite structure, which comprises an upper panel, a cobweb honeycomb core body and a lower panel.All the components are welded or bonded to form an integral structure. The upper panel is provided with micro-perforations, and the micro-perforations and the inner cavity of the cobweb honeycomb forma Helmholtz resonator to absorb noise. Under the condition of equal quality, the cobweb honeycomb is more excellent in bearing performance than a traditional honeycomb, and the cobweb honeycomb corebody can effectively support the panel to resist external loads. During use, the upper panel is installed towards a noise source, and the lower panel is back to the noise source. The structure of theinvention is simple, convenient to manufacture and light in weight, achieves the effects of sound absorption and bearing, can be used as a noise reduction component for high-speed trains and civil aircrafts, and improves the riding comfort.

Description

Technical field [0001] The invention relates to the field of noise reduction structures, in particular to a sound-absorbing and bearing composite structure of a micro-perforated plate spider web honeycomb sandwich core. Background technique [0002] With the increase of transportation speed, the magnitude of the mechanical noise and external aerodynamic noise of high-speed trains and civil aircraft has increased sharply. Various noise excitations are introduced into the internal space through the air and structures, which seriously affect the comfort of passengers. The micro-perforated plate is a typical resonance sound-absorbing structure. It is usually made by drilling small holes with a diameter of less than 1 mm on a thin plate. The cost is low, and it is designed and durable. However, the traditional micro-perforated plate has only one sound absorption peak, and the frequency range where the sound absorption coefficient continuously exceeds 0.5 is small, and it cannot achie...

AI Technical Summary

Problems solved by technology

However, the traditional micro-perforated plate has only one sound absorption peak, and the frequency range in which the sound absorption coefficient continuously exceeds 0.5 is small, and it cannot achieve a good noise reduction effect in a wide frequency range.

At the same time, the rigidity and strength are limited, so it cannot be used as a load-bearing part

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