17.140.00 标准查询与下载

KS F 2814-2-2002 阻抗管的吸音系数与阻抗的决定方法.第2部分:传递函数法

이 규격은 수직 입사음에 대해 흡음체의 흡음 계수를 결정하기 위한 임피던스 관, 두 개의

Acoustics-determination of sound absorption coefficient and impedance in impedance tubes－Part 2：Transfer-function method

KS F 2814-1-2001 阻抗管的吸音系数与阻抗的决定方法.第1部分:驻波比法

이 규격은 재료와 물체의 흡음 계수, 반사 계수 그리고 표면 임피던스 또는 표면 어드미턴스

Determination of sound absorption coefficient and impedance in impedance tubes Part 1:Method using standing wave ratio

EN ISO 11203:1995 声学.机械和设备产生的噪音.工作点和其它指定声音功率级位置处发出声压级的测定

This International Standard specifies two methods for determining the emission sound pressure levels of machinery and equipment, at a work station and at other specified positions nearby, by calculation from the sound power level. The principal purpose of this determination is to permit comparison of the performance of different units of a given family of machinery or equipment, under defined environmental conditions and standardized mounting and operating conditions. The data obtained may also be used for the declaration and verification of emission sound pressure levels as specified in IS0 4871. Emission sound pressure levels are determined with the same frequency weighting and time weighting, or in the same frequency bands, as those for which sound power levels have been determined. NOTES 1 The contents of this and related International Standards are summarized in table 1 of IS0 11200:1995. 2 At any given position in relation to a particular machine. and for given mounting and operating conditions, the emission sound pressure levels determined by the method of this International Standard will in general be lower than the directly measured sound pressure levels for the same machine in the typical workroom where it is used. This is due to reverberation and the contributions of other machines. A method of calculating the sound pressure levels in the vicinity of a machine operating alone in a workroom is given in IS0 11690-3. Commonly observed differences are 1 dB to 5 dB, but in extreme cases the difference may be even greater.

Acoustics - Noise Emitted by Machinery and Equipment - Determination of Emission Sound Pressure Levels at a Work Station and at Other Specified Positions from the Sound Power Level

DIN 45621-3:1985 听觉学用语音材料.儿童听觉理解力测试用词汇表

Speech material used in audiology; word lists for intelligibility testing in paediatric audiology