Sound barrier unit board based on wide band microperforated panel sound absorber and designing method thereof

Abstract

The invention discloses a sound barrier unit board based on a wide band microperforated panel sound absorber, and belongs to the technical field of environmental noise control. The sound barrier unit board comprises the sound absorber and a sound insulation backboard. The sound absorber comprises a microperforated panel and cavity sets with different depths. The sound insulation backboard comprises a back panel, an upper side panel and a lower side panel, and the left side and the right side of the sound insulation backboard are sealed with end sealing plates. The cavity sets with different depths are arranged on the back panel of the sound insulation backboard, and the opening sides of the cavity sets with different depths face the microperforated panel. The invention further discloses a designing method of the sound barrier unit board. The sound barrier unit board has the advantages of environment friendliness, simple structure, high strength, high weather resistance and the like. The noise reduction coefficient of the sound absorption unit board is not lower than 0.8. The sound barrier unit board has an excellent sound absorption property in a highway noise energy concentration frequency band, 1 / 3 octave center frequency random incidence sound absorption coefficients in the range from 125 Hz to 2500 Hz are all higher than 0.5, and the average value of 1 / 3 octave center frequency random incidence sound absorption coefficients in the range from 160 Hz to 2000 Hz is 0.85; and meanwhile the weight-counted sound insulation quantity Rw reaches 31 dB.

Description

technical field [0001] The invention belongs to the technical field of environmental noise control, and in particular relates to a sound barrier unit plate based on a broadband micro-perforated sound absorbing body and a design method thereof. Background technique [0002] Urban main roads, expressways and railways will generate a lot of noise pollution, reducing people's quality of life and threatening human health. Setting up corresponding sound barriers on both sides of roads or railways is an effective way to block noise transmission. Many sound barrier unit panels actually used are made of color steel sandwich panels, which are low in cost and have certain structural strength and sound insulation. However, it does not have sound absorption effect. When it is installed in parallel on both sides of the road or used next to high-density urban roads, the noise masking effect is significantly reduced due to the repeated reflection of noise between barriers or between barrier...

AI Technical Summary

Problems solved by technology

CN100523385C discloses a kind of gradual cavity micro-perforated broadband sound-absorbing sound barrier body, which is composed of a micro-perforated panel and an inclined back cavity whose depth of a single layer changes linearly. The sound absorption frequency band is wide, but the improvement effect is relatively limited

The reason is that the micro-perforated plate sound-absorbing body used in these designs has a limited sound-absorbing frequency bandwidth, and it is difficult to absorb traffic noise with a wide spectrum in practice alone.

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