Methods of measuring and evaluating noise of pumps
1 Scope
This standard specifies the environmental requirements for measuring sound pressure level on the measurement surface of envelope pump, measuring instruments, installation and working conditions of pump, measurement of surface sound pressure level, calculation of sound power level and evaluation method of noise level of pump.
This standard is applicable to pumps or pump units of various types except submerged pumps and reciprocating pumps, which are driven by motors and whose working medium is liquid.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 3102.7 Quantities and units—Acoustics
GB/T 3768 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Survey method using an enveloping measurement surface over a reflecting plane
GB/T 3785.1-2010 Electroacoustics—Sound level meters—Part 1: Specifications
GB/T 6882-2008 Acoustics—Determination of sound power levels of noise sources using pressure—Precision methods for anechoic and hemi-anechoic rooms
GB/T 7021 Glossary of terms for centrifugal pump
GB/T 14259 Acoustics—Guide to standards on the measurement of airborne acoustical noise and evaluation of its effects on human beings
GB/T 14573.2 Acoustics—Statistical methods for determining and verifying stated noise emission values of machinery and equipment—Part 2: Methods for stated values for individual machines
GB/T 14573.4 Acoustics—Statistical methods for determining and verifying stated noise emission values of machinery and equipment—Part 4: Methods for stated values for batches of machines
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 3102.7, GB/T 7021 and GB/T 14259 as well as the following apply.
3.1
time-averaged sound pressure level
Lpeq, T
a continuous and steady sound pressure level, which has the same mean square sound pressure as the measured sound that changes with time in the measurement time interval T, is also called equivalent sound pressure level
The time-averaged sound pressure level is calculated using Equation (1):
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test environment requirements
5 Measuring instruments
6 Installation and working conditions of pump
7 Measurement of sound pressure level
8 Calculation of A-weighted surface sound pressure level and A-weighted sound power level
9 Determination method of sound pressure level of pump
10 Evaluation method for noise level of pump
Annex A (Normative) Identification method for acoustic environment
Annex B (Normative) Microphone array on hemisphere measurement surface
Annex C (Normative) Microphone array on parallelepiped measurement surface
Annex D (Normative) Uncertainty of measurement
Annex E (Informative) Guidance for impulse noise detection
Annex F (Informative) Format of measurement records and test reports
Bibliography
