ISO 17201-5:2010 音響—射撃場からの騒音—パート5：騒音管理 | ページ 6

3.1

event duration

T

stated time interval, long enough to encompass all significant sound of a stated event at a reception point (3.22)

Note 1 to entry: The event duration is expressed in seconds.

Note 2 to entry: Adapted from ISO 17201-1:2005, 3.5.

3.2

sound exposure

E_T

Note 1 to entry: Sound exposure is expressed in square pascal seconds.

Note 2 to entry: Adapted from ISO 17201-1:2005, 3.6.

Note 3 to entry: Because of practical limitations of the measuring instruments, p² is always understood to denote the square of a frequency-weighted and frequency-band-limited sound pressure. If a specific frequency weighting as specified in IEC 61672-1 ^[6] is applied, this should be indicated by appropriate subscripts: e.g. E_{A,1 h} denotes the A-weighted sound exposure over 1 h.

Note 4 to entry: When applied to a single event, the quantity is called “single event sound exposure” and the symbol E is used without subscript.

Note 5 to entry: This definition is technically in accordance with ISO 80000-8:2007 ^[5] , 8-18.

3.3

sound exposure level

L_E

Note 1 to entry: Adapted from ISO 17201-1:2005, 3.7.

Note 2 to entry: Application of specific frequency weightings as specified in IEC 61672-1 ^[6] is indicated by appropriate subscripts.

Note 3 to entry: When applied to a single event, the quantity is called “single event sound exposure level” and the symbol L_E is used without further subscript.

Note 4 to entry: This definition is technically in accordance with ISO 80000-8:2007 ^[5] , 8-24.

3.4

total sound

totally encompassing sound in a given situation at a given time, usually composed of sound from many sources near and far

[SOURCE: ISO 1996-1:2003 ^[1] .3.4.1]

3.5

specific sound

component of the total sound (3.4) that can be specifically identified and which is associated with a specific source

[SOURCE: ISO 1996-1:2003 ^[1] .3.4.2]

3.6

residual sound

total sound (3.4) remaining at a given position and situation when the specific sounds (3.5) under consideration are suppressed

[SOURCE: ISO 1996-1:2003 ^[1] , 3.4.3]

Note 1 to entry: The lowest residual sound level is obtained when all specific sounds are suppressed.

Note 2 to entry: In Figure 1 a), the dotted area indicates the residual sound when sounds A, B, and C are suppressed.

Note 3 to entry: In Figure 1 b), the residual sound includes the specific sound C since it is not under consideration.

3.7

background sound pressure level

L_{A, N}

equivalent continuous sound pressure level of residual sound (3.6) for a specified period of time

Note 1 to entry: Background sound pressure level is expressed in decibels.

Note 2 to entry: The time should be chosen with respect to the rating time period.

Note 3 to entry: The background sound pressure level depends on many parameters (such as time of the day and of the year, wind speed, traffic, etc.) so that the level is expected to vary randomly.

3.8

background sound pressure spectrum

spectrum obtained by averaging over all spectra obtained during the specified time T without unusual events or during periods where the level is below a specified percentile level

3.9

source combination

k

combination of specified weapon, ammunition, firing location, and firing direction used in the shooting range

3.10

immission class

class, of width 3 dB, to which a source combination (3.9) is assigned on the basis of the A-weighted long-term sound exposure level L_{E ,A} at a specified reception point (3.22)

Note 1 to entry: The long-term averaged sound exposure level is defined in ISO 1996-1:2003 ^[1], 3.2.2.

3.11

immission class 0

immission class (3.10) with the highest long-term sound exposure level L_{E ,A,max} at a specified reception point (3.22)

Note 2 to entry: The immission class limits are usually different for differently situated reception points.

Note 3 to entry: If the range is used under all weather conditions, the maximum value refers to the long-term average of these conditions. If the use is linked to specific weather conditions, the maximum value refers to the long-term average for those conditions.

Note 4 to entry: The operator “round” is used to denote rounding to the nearest integer.

3.12

immission class i

immission class (3.10) with an upper limit that is 3 i dB, where i is an integer, below the upper limit of immission class 0 (3.11)

3.13

N % exceedance level

L_N(T)

time-weighted and frequency-weighted sound pressure level that is exceeded for N % of the time interval T considered

Note 1 to entry: The N % exceedance level is expressed in decibels.

Note 2 to entry: Adapted from ISO 1996-1:2003, 3.1.3.

3.14

event index

number of shooting events of limited duration of which the time- and frequency-weighted level exceeds a given value for a given time period, such as time of day, day of the week or their combinations

Note 1 to entry: The event index counts the number of events exceeding a specific level at the reception point.

3.15

event index limit

limit that should not be exceeded by the event index (3.14)

3.16

immission class factor

C_k

3.17

quota count

QC

n_Q

sound dose as sound energy/time at a reception point (3.22) resulting from all shots fired on a range during a specific time period expressed as an equivalent number of shots of immission class 0 (3.11)

3.18

quota count limit

QCL

n_{Q, lim}

upper limit number of the quota count (3.17) which is related to the permissible or pursued limiting level

3.19

immission class level

L_{E, A ,i}

Note 1 to entry: The immission class level is expressed in decibels.

3.20

equivalent continuous sound pressure level

L_{p ,eq T}

[SOURCE: ISO/TR 25417:2007 ^[4] , 2.3]

3.21

sound emergence

E_m

increase from background sound pressure level L_{A, N} (3.7) to total A-weighted equivalent continuous sound pressure level, L_A,eq, due to shooting sound

Note 1 to entry: Adapted from ISO 1996-1:2003 ^[1] , 3.4.7.

Note 2 to entry:E_m = L_A,eq − L_A,N .

Note 3 to entry: The sound emergence is expressed in decibels.

3.22

reception point

point of interest within the context of noise management

3.23

evaluation period

T_p

time period to be assessed by the rating level

Note 1 to entry: The evaluation period is expressed in seconds.

3.24

source classification

classification for all weapon and ammunition combinations with respect to the weapon type

Note 1 to entry: In the context of noise management procedures in this part of ISO 17201, the immission class quantities can replace the acoustical features of the specific weapon/ammunition combinations.

3.25

source energy class

classification for the muzzle blast of weapon and ammunition combinations with respect to the source strength in terms of source energy level

Note 1 to entry: The sound energy level can be measured or estimated in accordance with ISO 17201-1 or ISO 17201-2, respectively. See also Annex B.

3.26

source direction class

classification of weapon/ammunition combinations with respect to the directivity in terms of the angular source energy distribution

Note 1 to entry: The directivity pattern can be measured or estimated in accordance with ISO 17201-1 or ISO 17201-2, respectively. See also Annex B.

3.27

specified level

L_V

upper limit for the long-term L_A,_eq used for the management process

Note 1 to entry: The specified level is expressed in decibels.