If at 1000Hz the sound level is 75% lower after the introduction of thesoundproofing material, it would be granted an NRC rating of 0.75 @ 1000Hz. Similarly, if the noise reduction was 5%, the NRC rating would be 0.05 @ 1000Hz. An NRC of 0.75 and above is considered a good and ef...
A Noise Reduction Coefficient – commonly known as NRC – is a single number rating which represents the average of sound Absorption Coefficients of a material at specific mid-range frequencies (tested at 250, 500, 1,000, and 2,000 Hz octaves). The purpose of an NRC rating is to provide...
独特的开孔三维结构能有效地阻挡声波,消音系数NRC=0.95,超过大多数传统材料。 The unique three-dimensional structure of the opening can effectively block the sound wave, and the noise reduction coefficient NRC=0.95, which exceeds most traditional materials. High-decibel noise in industrial and manufacturing...
This work aims to predict the noise reduction coefficient (NRC) of nonwoven layers produced from Estabragh/polypropylene blends of fibers. Estabragh is a natural hollow fiber which can be expected to have excellent sound insulation properties. In addition to the investigation of Estabragh's unique...
The sound absorption capacity of the material refers to the noise reduction coefficient (Noise Reduction Coefficient –NRC), being the arithmetic mean of the absorption coefficients of the octave bands from 250 to 2,000 Hz [7,31]. The values of the sound absorption coefficients (α) vary ...
1)Noise reduction coefficient降噪系数 1.The result shows that average absorption coefficient and noise reduction coefficient separately equal to 0.结果表明材料的平均吸声系数和降噪系数分别达0。 2.The effects of degumming time,bath ration,the concentrations of NaOH,Na2SO3 and Na2SiO3 on the noise reduct...
3) NRC (noise reduction coefficient) 噪声降低系数4) Noise reduction coefficient 降噪系数 1. The result shows that average absorption coefficient and noise reduction coefficient separately equal to 0. 结果表明材料的平均吸声系数和降噪系数分别达0。 2. The effects of degumming time,bath ration,the...
1) Noise reduction coefficient 降噪系数1. The result shows that average absorption coefficient and noise reduction coefficient separately equal to 0. 结果表明材料的平均吸声系数和降噪系数分别达0。2. The effects of degumming time,bath ration,the concentrations of NaOH,Na2SO3 and Na2SiO3 on the noise...
NRC (redirected fromNoise Reduction Coefficient) Thesaurus Medical Acronyms Encyclopedia Wikipedia Related to Noise Reduction Coefficient:Sound transmission class,sound absorption coefficient NRC abbr. 1.National Research Council 2.Nuclear Regulatory Commission ...
absorbing materials used are rated using Noise Reduction Coefficient (NRC), which is basically a type of average of sound absorption coefficients from 250 Hz to 2 kHz, the primary speech frequency range. From perfectly absorptive (NRC = 1.0) to perfectly reflective (NRC = 0.0) NRC theoretically...