Measurement of airborne noise from hydraulic fluid power systems and components Simplified method of determining sound power levels from pumps using an anechoic chamber

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-1985

Publisher

British Standards Institution

Foreword
Committees responsible
Method
0 Introduction
1 Scope
2 Definitions
3 Measurement uncertainty
4 Test environment
5 Instrumentation
6 Installation conditions for pump
7 Operating conditions
8 Location and number of sound measuring points
9 Test procedure
10 Calculation of pump mean sound pressure levels and
    sound power levels
11 Calculation of mean sound pressure level at a
    reference distance
12 Information to be recorded
13 Test report
Appendices
A Errors and classes of measurement
B Reference dimensions, axes and location of sound
    measuring points
C Corrections for pump sound power level
D Calculation of mean sound pressure level at a
    reference distance
Tables
1 Standard deviation of sound power level
    determination
2 Allowable variations in test conditions
3 Permissible systematic errors of measuring
    instruments as determined during calibration
4 Coordinates of microphone locations
Figure
1 Key reference axes and dimensions

Describes simplified procedures for the determination of the sound power levels of a hydraulic fluid power pump under controlled conditions of installation and operation using a quadrispherical microphone array in an anechoic chamber. These procedures provide a basis for comparing noise levels of pumps.

This Part of BS 5944 describes procedures for the determination of the sound power levels of a hydraulic fluid power pump, under controlled conditions of installation and operation, suitable for providing a basis for comparing the noise levels of pumps in terms of:

A-weighted sound power level;
octave band sound power levels.

From these sound power levels, sound pressure levels may be calculated for reporting purposes (see clause 11).

For general purposes, the frequency range of interest includes the octave bands with centre frequencies between 125 Hz and 8 000 Hz.

This method is applicable to all types of hydraulic fluid power pumps operating under steady-state conditions, irrespective of size, except for any limitations imposed by the size of the test environment (see clause 4).

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

Committee	MCE/18
DevelopmentNote	Supersedes 84/76091 DC (09/2005) Reviewed and confirmed by BSI, February 2012. (01/2012)
DocumentType	Standard
Pages	14
PublisherName	British Standards Institution
Status	Current

BS 4196-4:1981	Sound power levels of noise sources Engineering methods for determination of sound power levels for sources in free-field conditions over a reflecting plane
BS 4196-0:1981	Sound power levels of noise sources Guide for the use of basic standards and for the preparation of noise test codes
BS 661:1969	Glossary of acoustical terms
BS 5944-4:1984	Measurement of airborne noise from hydraulic fluid power systems and components Method of determining sound power levels from valves controlling flow and pressure
BS 5969:1981	Specification for sound level meters
BS 5944-2:1980	Measurement of airborne noise from hydraulic fluid power systems and components Method of test for motors
BS 5944-1:1980	Measurement of airborne noise from hydraulic fluid power systems and components Method of test for pumps
BS 5944-3:1980	Measurement of airborne noise from hydraulic fluid power systems and components Guide to the application of Part 1 and Part 2
BS 6413-4:1983	Lubricants, industrial oils and related products (class L) Classification for family H (hydraulic systems)

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BS 5944-5:1985

Measurement of airborne noise from hydraulic fluid power systems and components Simplified method of determining sound power levels from pumps using an anechoic chamber

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