Metal sound insulation low-frequency acoustical board

Abstract

The invention relates to a metal sound insulation low-frequency acoustical board, which has sound insulation and low-frequency sound absorption effects and can be widely applied in an acoustic room or anechoic chamber with low-frequency acoustic requirements. According to the absorption principle of resonance sound-absorbing materials and structures, resonance occurs when natural vibration frequency of resonance sound-absorbing materials and structures is consistent with frequency of sound wave, and the resonance sound-absorbing materials and structures can consume sound energy and plays a role in sound absorption when the resonance reaches the maximum amplitude. An elastic cushion, a sounding board and an elastic material are successively arranged between an internal surface metal perforated plate and an external surface steel plate which form the metal sound insulation low-frequency acoustical board provided by the invention, wherein the sounding board is composed of several nonmetal plates or metal sheets. An acoustic room prepared from the metal sound insulation low-frequency acoustical board has good low-frequency sound absorption characteristics. The inner wall of the acoustic room can be provided with a wedge absorber or flat sound absorber to form a low-frequency anechoic chamber, and the length of the wedge absorber can be shortened or the thickness of the flat sound absorber can be reduced so as to save land occupation and decrease cost of construction.

Description

technical field [0001] The invention relates to a sound-insulating and sound-absorbing board, in particular to a metal sound-insulating low-frequency sound-absorbing board. Background technique [0002] In addition to porous sound-absorbing materials, there is also a resonant sound-absorbing material and structure used in actual acoustic engineering. The sound absorption mechanism of resonant sound-absorbing materials and structures is that when the natural frequency of the sound-absorbing materials and structures is consistent with the frequency emitted by the sound waves, resonance occurs, and the sound waves excite the sound-absorbing materials and structures to vibrate and maximize the amplitude, thereby consuming Acoustic energy, to achieve the purpose of sound absorption. Therefore, the sound absorption characteristics of resonant sound-absorbing materials and structures show the appearance of peak sound absorption, that is, the sound absorption coefficient reaches th...

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Problems solved by technology

[0005] Currently widely used building decoration materials or structures such as gypsum board ceilings, gypsum board partition walls, wooden floors and wooden dadoes, etc., have a certain sound absorption effect, but they are not enough to generate resonance under the excitation of sound waves, and their sound absorption coefficient is only It can reach 0.3-0.4. Even if the whole room is covered with these sound-absorbing materials, the sound-absorbing effect with a sound absorption coefficient close to 1 cannot be achieved, and these sound-absorbing materials need to be processed on site according to the position and size, which belong to the scope of acoustic decoration. It is not a special module for industrial production, it is not easy to grasp its relatively accurate low-frequency sound absorption frequency range, and it lacks sound insulation effect

[0006] Although there are also modular sound insulation and sound absorption panels in use, the interior of the shell is mainly filled with sound insulation, sound absorption and damping materials, which belong to the sound insulation and sound absorption structure. There is a hard connection between the internal material and the skeleton, and the absorbed The noise frequency is medium and high frequency, which does not belong to the resonant sound-absorbing structure

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