Weighted sound insulation It refers to the sound insulation measured through the weighted network. When the frequency spectrum and sound level of the sound source room are fixed, the sound level insulation measured in the receiving room shall be used as the sound insulation evaluation of the partition or component.
Weighted sound insulation It is determined by comparing a standard curve with the sound insulation frequency characteristic curve of the component. On the one hand, the standard curve takes into account the auditory characteristics of the human ear, that is, the human ear is not as sensitive to high-frequency sounds as low-frequency sounds. On the other hand, it is also considered that the low frequency sound insulation of sound insulation components is usually low, while the high frequency sound insulation is high. The standard curve is a broken line that changes with frequency. Although the sound insulation of each frequency is different, the sound insulation effect of this standard curve is the same as that of Equal loudness curve Similarly, it is actually an equal sound insulation effect curve. The steps to determine the weighted sound insulation are as follows:
First, draw the sound insulation amount of each frequency band of the sound insulation component on the coordinate paper with the ordinate as the sound insulation amount and the abscissa as the frequency, and connect it into the sound insulation frequency characteristic curve. Then draw the standard curve for evaluating the weighted sound insulation on transparent paper with the same coordinate scale (or copy the standard curve on transparent polyester film), place the transparent standard curve on the sound insulation frequency characteristic curve of the component, align the frequency coordinates of the two figures, and move up and down in the vertical direction until the following two conditions are met.
The 1/3 octave sound insulation frequency characteristic curve shall meet the following requirements:
(1) The sum of the dB number of the adverse deviation of each frequency band under the standard curve shall not be greater than 32dB.
(2) The maximum value of the adverse deviation of the sound insulation amount of any frequency band of the sound insulation frequency characteristic curve below the standard curve shall not be greater than 8dB.
The 1/1 octave sound insulation frequency characteristic curve shall meet the following requirements:
(1) The sum of dB numbers of each frequency band under the standard curve shall not be greater than 10dB.
(2) The maximum value of the adverse deviation of the sound insulation amount of any frequency band of the sound insulation frequency characteristic curve below the standard curve shall not be greater than 5dB.
Then, make a vertical line from 500Hz upward to intersect with the standard curve, and make a horizontal line through the intersection point to intersect with the ordinate of the sound insulation frequency characteristic curve, then the dB number of the intersection point is the calculated weighted sound insulation amount RW
