ISO 11200:2014 音響 — 機械設備から放出される騒音 — 作業ステーションおよびその他の指定された位置での放出音圧レベルを決定するための基本的な基準の使用に関するガイドライン | ページ 6

3.1

emission

<acoustics> airborne sound radiated by a well-defined noise source (e.g. the machine under test)

Note 1 to entry: Noise emission descriptors can be incorporated into a product label and/or product specification. The basic noise emission descriptors are the sound power level of the source itself and the emission sound pressure levels at a work station and/or at other specified positions (if any) in the vicinity of the source.

[SOURCE: ISO 11201:2010, 3.1]

3.2

emission sound pressure

p

sound pressure, at a work station or another specified position near a noise source, when the source is in operation under specified operating and mounting conditions on a reflecting plane surface, excluding the effects of background noise as well as the effects of reflections other than those from the plane or planes permitted for the purpose of the test

Note 1 to entry: Emission sound pressure is expressed in pascals.

[SOURCE: ISO 11201:2010, 3.2]

3.3

emission sound pressure level

L_p

Note 1 to entry: The emission sound pressure level is determined at a work station or another specified position in accordance with either a noise test code for a specific family of machines or, if no noise test code exists, one of the standards of the group (i.e. this International Standard along with ISO 11201, ISO 11202, ISO 11203, ISO 11204 and ISO 11205).

[SOURCE: ISO 11201:2010, 3.3, modified — In Note 1, the reference numbers of the group of standards have been written in full.]

3.4

time-averaged emission sound pressure level

L_p,T

Note 1 to entry: For simplicity of notation, the subscript T is omitted throughout the following text.

Note 2 to entry: If specific frequency and time weightings as specified in IEC 61672–1 and/or specific frequency bands are applied, this is indicated by appropriate subscripts; e.g. L_pA denotes the A-weighted emission sound pressure level.

Note 3 to entry: The formula is equivalent to that for the environmental noise descriptor “equivalent continuous sound pressure level” (ISO 1996‑1^[1]). However, the emission quantity defined above is used to characterize the noise emitted by a source under test and assumes that standardized measurement and operating conditions as well as a controlled acoustical environment are used for the measurements.

Note 4 to entry: ISO 11205 uses L_I instead of L_p,T and replaces p² by the magnitude of the intensity vector, , and p₀² by I₀ = 10⁻¹² W/m².

[SOURCE: ISO 11201:2010, 3.4, modified — Notes 1 to 3 have been renumbered; Note 4 has been added.]

3.5

peak emission sound pressure

p_peak

greatest absolute emission sound pressure during a stated time interval

Note 1 to entry: Peak emission sound pressure is expressed in pascals.

Note 2 to entry: A peak emission sound pressure may arise from a positive or negative sound pressure.

[SOURCE: ISO 11201:2010, 3.5]

3.6

peak emission sound pressure level

L_p,peak

Note 1 to entry: The peak emission sound pressure level is usually C-weighted and denoted by L_pC,peak.

[SOURCE: ISO 11201:2010, 3.6]

3.7

single event emission sound pressure level

L_E

Note 1 to entry: This formula is equivalent to that for the environmental noise descriptor “sound exposure level”. However, the emission quantity defined above is used to characterize the noise emitted by a source under test and assumes that standardized measurement, mounting, and operating conditions as well as a controlled acoustical environment are used for the measurements.

[SOURCE: ISO 11201:2010, 3.7, modified — The source of"sound exposure level" has been deleted from Note 1.]

3.8

work station

operator's position

position in the vicinity of the machine under test which is intended for the operator

[SOURCE: ISO 11201:2010, 3.11]

3.9

operator

individual whose work station is in the vicinity of a machine and who is performing a work task associated with that machine

[SOURCE: ISO 11201:2010, 3.12]

3.10

specified position

position defined in relation to a machine, including, but not limited to, an operator's position

Note 1 to entry: The position can be a single, fixed point, or a combination of points along a path or on a surface located at a specified distance from the machine, as described in the relevant noise test code, if one exists.

Note 2 to entry: Positions located in the vicinity of a work station, or in the vicinity of an unattended machine, are identified as “bystander positions”.

[SOURCE: ISO 11201:2010, 3.13, modified — Note 3 has been deleted.]

3.11

operational period

interval of time during which a specified process is accomplished by the source under test

[SOURCE: ISO 11201:2010, 3.14]

3.12

operational cycle

specific sequence of operational periods occurring while the source under test performs a complete work cycle, where each operational period is associated with a specific process that may occur only once, or may be repeated, during the operational cycle

[SOURCE: ISO 11201:2010, 3.15]

3.13

measurement time interval

portion or a multiple of an operational period or operational cycle of the source under test, for which the time-averaged emission sound pressure level is determined or over which the maximum emission sound pressure level is sought

[SOURCE: ISO 11201:2010, 3.16]

3.14

background noise

noise from all sources other than the source under test

Note 1 to entry: Background noise can include contributions from airborne sound, noise from structure-borne vibration, and electrical noise in instrumentation.

[SOURCE: ISO 11201:2010, 3.18]

3.15

background noise correction

K₁

correction applied to the measured sound pressure levels to account for the influence of background noise

Note 1 to entry: Background noise correction is expressed in decibels.

Note 2 to entry: Background noise correction is frequency dependent. In the case of A-weighting, the correction, K_1A, is determined from A-weighted measured values.

[SOURCE: ISO 11201:2010, 3.19]

3.16

reference box

hypothetical rectangular parallelepiped terminating on the reflecting plane(s) on which the noise source under test is located, that just encloses the source including all the significant sound-radiating components and any test table on which the source may be mounted

[SOURCE: ISO 11201:2010, 3.20]

3.17

reference measurement surface

S_M

hypothetical surface defined by a rectangular parallelepiped enveloping the noise source under test, terminating on the reflecting plane(s) on which the source is located, and having sides parallel to those of the reference box with each side spaced at equal distance from the corresponding side of the reference box

[SOURCE: ISO 11201:2010, 3.21]

3.18

sound power

P

rate over given time interval at which airborne sound energy is radiated by a source

Note 1 to entry: Sound power is expressed in watts.

3.19

sound power level

L_W

ten times the logarithm to the base 10 of the ratio of the sound power radiated by the source under test to the reference sound power

Note 1 to entry: Sound power level is expressed in decibels.

Note 2 to entry: The reference sound power is 1 pW (10⁻¹² W).

[SOURCE: ISO 3744:2010, 3.21, modified — The definition and Notes 1 and 2 have been changed.]

3.20

environmental correction

K₂

term to account for the influence of reflected sound on the mean sound pressure level on the reference measurement surface, expressed in decibels

Note 1 to entry:K₂ is frequency dependent and can be determined in accordance with ISO 3744 or ISO 3746. In the case of A-weighting, it is denoted K_2A.

[SOURCE: ISO 11201:2010, 3.22]

3.21

local environmental correction

K₃

correction applied to the measured sound pressure levels at the work station to account for the influence of reflected sound, expressed in decibels

Note 1 to entry: The local environmental correction is frequency dependent. In the case of A-weighting, it is denoted K_3A.

Note 2 to entry:K₃ is only obtained on completion of testing.

[SOURCE: ISO 11202:2010, 3.25, modified — Note 2 has been added.]

3.22

work station directivity index

D_I,op

Note 1 to entry: These levels are determined in an essentially free field over a reflecting plane and have been corrected for background noise and for environmental influences, if relevant.

[SOURCE: ISO 11202:2010, 3.22]

3.23

apparent work station directivity index

[SOURCE: ISO 11202:2010, 3.23]

3.24

approximate apparent work station directivity index

[SOURCE: ISO 11202:2010, 3.24]

3.25

noise test code

standard that is applicable to a particular class, family or type of machinery or equipment, which specifies all the information necessary to carry out efficiently the determination, declaration and verification of the noise emission characteristics under standardized conditions

[SOURCE: ISO 12001:1996, 3.2]

3.26

standard deviation of reproducibility of the method

σ_R0

<for a specified noise emission measurement method and for characterizing the measurement method> standard deviation of noise emission values obtained under reproducibility conditions (different environments, different operators, different instrumentation) for a sound source with constant noise emission

3.27

standard deviation due to operating and mounting conditions of the sound source

σ_omc

<for a specific set of operating and mounting conditions of a specified sound source> standard deviation of noise emission values obtained by repeating measurements according to the same noise emission measurement method under the same conditions (same environment, same operator, same instrumentation)

Note 1 to entry: This standard deviation characterizes the stability of the noise emitted by the source.

3.28

total standard deviation

σ_tot

Note 1 to entry: When a batch of identical sound sources is considered, the standard deviation of production should be taken into account by proper addition (see ISO 4871).^[3]

3.29

typical distance

d

distance from the work station to the closest major sound source of the machine under test, without screening objects protruding into the line of sight between the major sound source and the work station

Note 1 to entry: In the case of extended sound-radiating areas, d is the length of the shortest possible line of sight between the source under test and the work station.

[SOURCE: ISO 11202:2010, 3.26]