DIN EN ISO 9614-1-2009 声学.声压法测定噪声源声功率级使用声音强度法,第1部分:离散点测试(ISO 9614-1:1993),德文版本 EN ISO 9614-1:2009
Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 1: Measurement at discrete points (ISO 9614-1:1993); English version of DIN EN ISO 9614-1:2009-11
1.1 This part of ISO 9614 specifies a method for
measuring the component of sound intensity normal
to a measurement surface which is chosen so as to
enclose the noise source(s} of which the sound power
level is to be determined. The one-octave, one-third-
octave or band-limited weighted sound power level is
calculated from the measured values. The method is
applicable to any source for which a physically sta-
tionary measurement surface can be defined, and on
which the noise generated by the source is stationary
in time (as defined in 3.13). The source is defined by
the choice of measurement surface. The method is
applicable in situ, or in special purpose test environ-
ments,
1.2 This part of ISO 9614 is applicable to sources
situated in any environment which is neither so vari-
able in time as to reduce the accuracy of the meas-
urement of sound intensity to an unacceptable
degree, nor subjects the intensity measurement
probe to gas flows of unacceptable speed or un-
steadiness (see 5.3 and 5.4).
In some cases, it will be found that the test conditions
are too adverse to allow the requirements of this part
of ISO 9614 to be met. In particular, extraneous noise
levels may vary to an excessive degree during the
test. In such cases, the method given in this part of
ISO 9614 is not suitable for the determination of the
sound power level of the source.
NOTE 1 Other methods, e.g. determination of sound
power levels from surface vibration levels as described in
ISO/TR 7849, may be more suitable.
1.3 This part of ISO 9614 specifies certain ancillary
procedures, described in annex B, to be followed in
conjunction with the sound power determination. The
results are used to indicate the quality of the deter-
mination, and hence the grade of accuracy. If the in-
dicated quality of the determination does not meet
the requirements of this part of ISO 9614, the test
procedure should be modified in the manner indi-
cated.