減噪係數(NRC)

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減噪係數NRC(Noise Reduction Coefficient),又稱吸音係數、吸音率。
源自於美國ASTM,是一種用來評定材料減噪能力的一種指標。意思是聲音撞擊材料後能量損失的現象,所以NRC越高,表示吸收音波能量的能力越強。
計算方式為材料分別在殘響室以250Hz,500Hz,1000Hz,2000Hz條件下測得的噪音吸收百分比之平均值。公式如下所示

通常取到小數點下兩位,且以0.05為最小單位。舉例來說,若以計算出來的平均值為0.87,則在評定上此材料的NRC為0.85。
註:一般常見無沖孔鋁平板(厚度1.0mm)吸音能力約為0.15


Application


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    Perfection is the pursuit of interior designers. Linear Grid System can combine with different types of ceiling panels to create artistic ceiling system. Whether pyramid-shaped, three-dimensional art style, or simple style ceiling panels, it all can create your own unique ceiling space.

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    A simple space with infinite imagination. Through flat or strip panel in solid or horizontal arrangement, a new visual impression was created with not only beautiful lines but also imagination of infinite extension. Its feature of flexible arrangement and assembly makes it has the best visual effect.

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    Connected by tapered shape with a cross modeling at joint, it is the most stylish and creative metal ceiling with implication of success and luck. Using this creativity of full of cross at wide surface, quality and avant-garde living space were highlighted.

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    Intrigued from theory by Ma, Da-You in 1970s, many countries have involved for noise control to replace harmful material such as mineral wool and glass wool. Since 2001, we have cooperated with NSC and NCKU to research its acoustic absorption and developed broadband board with aperture up to 0.1mm far lower than 0.5mm of others and absorption ratio of NRC 0.7-0.9 within 0.8 of αω value by ROC.

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