This standard is applicable to all types of submarines (except in-pulse sound measurement).
2 Measuring instruments
2.1 The sound level meter shall comply with the provisions of Type 1 of GB 3785-83 Electric, sonic properties and measuring methods for sound level meters; other instruments with the same performance may also be used.
2.2 In octave band or one-third-octave band measurements, the selection of filters shall comply with GB 3241-82 Octave and one-third-octave band filters used for the analysis of sound and vibration.
2.3 The microphone shall be of random incidence type and comply with the relevant provisions in 2.1.
2.4 At the beginning and end of each measurement, the sound level meter or other measuring instruments used shall be calibrated by sound level calibrator, and the difference between the two calibrations shall not exceed ±0.5 dB, otherwise the measurement is considered invalid.
2.5 The measuring instruments and sound level calibrators used shall be submitted annually to the national metrology departments for verification in accordance with JJG 188-78 Trial Verification Regulations of Sound Level Meter and JJG 176-76 Verification Regulation of Sound Calibrators.
2.6 When the wind speed affects the measurement, a windscreen or nose cone shall be added.
2.7 Sound level measurements for acoustic processing and other contrast purposes are, in principle, measured with the same instrument. When it is difficult to use the same instrument, the same type of instrument may be used for measurement, but the same calibrator needs to be used for calibration before and after the measurement.
Foreword i 1 Application scope 2 Measuring instruments 3 Measured values 4 Environmental and cabin conditions 5 Submarine and main and auxiliary engine status 6 Microphone position 7 Measuring position 8 Measuring report and record
Standard
GJB 161-1986 Measurement of noise for submarines in room (English Version)
Measurement of noise for submarine in room
1 Application scope
This standard is applicable to all types of submarines (except in-pulse sound measurement).
2 Measuring instruments
2.1 The sound level meter shall comply with the provisions of Type 1 of GB 3785-83 Electric, sonic properties and measuring methods for sound level meters; other instruments with the same performance may also be used.
2.2 In octave band or one-third-octave band measurements, the selection of filters shall comply with GB 3241-82 Octave and one-third-octave band filters used for the analysis of sound and vibration.
2.3 The microphone shall be of random incidence type and comply with the relevant provisions in 2.1.
2.4 At the beginning and end of each measurement, the sound level meter or other measuring instruments used shall be calibrated by sound level calibrator, and the difference between the two calibrations shall not exceed ±0.5 dB, otherwise the measurement is considered invalid.
2.5 The measuring instruments and sound level calibrators used shall be submitted annually to the national metrology departments for verification in accordance with JJG 188-78 Trial Verification Regulations of Sound Level Meter and JJG 176-76 Verification Regulation of Sound Calibrators.
2.6 When the wind speed affects the measurement, a windscreen or nose cone shall be added.
2.7 Sound level measurements for acoustic processing and other contrast purposes are, in principle, measured with the same instrument. When it is difficult to use the same instrument, the same type of instrument may be used for measurement, but the same calibrator needs to be used for calibration before and after the measurement.
Contents of GJB 161-1986
Foreword i
1 Application scope
2 Measuring instruments
3 Measured values
4 Environmental and cabin conditions
5 Submarine and main and auxiliary engine status
6 Microphone position
7 Measuring position
8 Measuring report and record
