Scope
This part of GB/T 3222 describes how sound pressure levels can be determined by direct measurement, by extrapolation of measurement results by means of calculation, or exclusively by calculation, intended as a basis for assessing environmental noise. Recommendations are given regarding preferable conditions for measurement or calculation to be applied in cases where other regulations do not apply. This part of GB/T 3222 can be used to measure with any frequency weighting or in any frequency band. Guidance is given to evaluate the uncertainty of the result of a noise assessment.
Notes:
1 As this part of GB/T 3222 deals with measurements under actual operating conditions, there is no relationship between this part of GB/T 3222 and other ISO standards specifying emission measurements under specified operating conditions.
2 For the sake of generality, the frequency and time weighting subscripts have been omitted throughout this part of GB/T 3222.
2 Normative References
The following normative documents contain provisions which, through reference in this part of GB/T 3222, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 3222.1-2006 Acoustics - Description Measurement and Assessment of Environmental Noise - Part 1: Basic Quantities and Assessment Procedures (ISO 1996-1:2003, IDT)
GB/T 3241-1998 Octave-band and Fractional-octave-band Filters (eqv IEC 61260:1995)
ISO 7196 Acoustics - Frequency-weighting Characteristic for Infrasound Measurements
IEC 60942:2003 Electroacoustics - Sound Calibrators
IEC 61672-1:2002 Electroacoustics - Sound Level Meters - Part 1: Specifications
JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement (equivalent to GUM (Guide to the Expression of Uncertainty in Measurement) in principle)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 3222.1:2006 and the following apply.
3.1
receiver location
location at which the noise is assessed
3.2
calculation method
set of algorithms to calculate the sound pressure level at arbitrary locations from measured or predicted sound emission and sound attenuation data
3.3
prediction method
subset of a calculation method, intended for the calculation of future noise levels
3.4
measurement time interval
time interval during which a single measurement is conducted
3.5
observation time interval
time interval during which a series of measurements is conducted
3.6
meteorological window
set of weather conditions during which measurements can be performed with limited and known variation in measurement results due to weather variation
3.7
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Measurement Uncertainty
5 Instrumentation
6 Operation of the Source
7 Weather Conditions
8 Measurement Procedure
9 Evaluation of the Measurement Result
10 Extrapolation to Other Conditions
11 Calculation
12 Information to be Recorded and Reported
Annex A (Informative) Meteorological Window and Measurement Uncertainty due to Weather
Annex B (Informative) Microphone Positions Relative to Reflecting Surfaces
Annex C (Informative) Objective Method for Assessing the Audibility of Tones in Noise - Reference Method
Annex D (Informative) Objective Method for Assessing the Audibility of Tones in Noise - Simplified Method
Annex E (Informative) National Source-specific Calculation Methods
Bibliography
