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BS 5944-2:1992

BS 5944-2:1992

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Measurement of airborne noise from hydraulic fluid power systems and components Method of test for motors

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

15-12-1992

Publisher

British Standards Institution

Committees responsible
National foreword
Introduction
Method
1 Scope
2 Normative references
3 Definitions
4 Measurement uncertainty
5 Test environment
6 Instrumentation
7 Installation conditions
8 Operation conditions
9 Location and number of sound measurement points
10 Test procedure
11 Information to be recorded
12 Test report
13 Identification statement (Reference to this part of
     ISO 4412)
Annexes
A Calculation of sound levels
B Errors and classes of measurement
C Guidelines for the application of this part of ISO
     4412
D Bibliography
Tables
1 Standard deviation of sound power level
     determinations
2 Allowable variations of mean indicated values of
     controlled parameters
B.1 Permissible systematic errors of measuring
     instruments as determined during calibration
Figures
C.1 Transmission paths of sound energy from pumps
C.2 Instrumentation for manual data logging
C.3 Multiple microphone scanning instrumentation
C.4 Corrections for background noise
C.5 Pump noise test configuration with hemispherical
     measuring array
C.6 Mounting and driveline arrangement for
     hemispherical measuring array
C.7 "Minimized" motor mount (two-bolt flange mounting
     configuration)
C.8 Diagrammatic views of the hemispherical layout
     showing fluid line cladding
C.9 Example of test circuit

Establishes a test code describing procedures for the determination of the sound power levels of a hydraulic fluid power motor (under controlled conditions of operation and installation) suitable for giving a basis for comparing the noise levels of motors in: octave band sound power levels and a weighted sound power level. Applies to all types of hydraulic fluid power motors operating under steady-state conditions, irrespective of size, except for any limitations that the size of the test environment may impose.

This part of ISO 4412 establishes a test code describing procedures, based on ISO 2204, for the determination of the sound power levels of a hydraulic fluid power motor, under controlled conditions of installation and operation, suitable for providing a basis for comparing the noise levels of motors in terms of:

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

From these sound power levels, if required, reference sound pressure levels may be calculated for reporting purposes in accordance with Annex A.

For general purposes, the frequency range of interest includes the octave bands with centre frequencies between 125 Hz and 8 000 Hz.1)

Due to the inherent difficulties in the measurement of low-speed motor performance, this part of ISO 4412 is limited to motors operating at speeds exceeding 50 r/min.

Guidelines for the application of this part of ISO 4412 are given in Annex C.

This part of ISO 4412 is applicable to all types of hydraulic fluid power motors operating under steady-state conditions, irrespective of size, except for any limitations imposed by the size of the test environment (see clause 5).

Committee
MCE/18
DevelopmentNote
Supersedes BS 5944-1(1980) BS 5944-2(1980) and BS 5944-3(1980) (07/2004) Also numbered as ISO 4412-2 Supersedes 89/78172 DC (09/2005)
DocumentType
Standard
Pages
24
PublisherName
British Standards Institution
Status
Current
Supersedes

ISO 2204:1979 Acoustics Guide to International Standards on the measurement of airborne acoustical noise and evaluation of its effects on human beings
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
ISO 5598:2008 Fluid power systems and components Vocabulary
BS 4196-5:1981 Sound power levels of noise sources Precision methods for determination of sound power levels for sources in anechoic and semi-anechoic rooms
BS 4727-3:GRP08(1985) : 1985 GLOSSARY OF ELECTROTECHNICAL POWER TELECOMMUNICATION ELECTRONICS LIGHTING & COLOUR TERMS - TERMS PARTICULAR TO TELECOMMUNICATIONS & ELECTRONICS - ACOUSTICS & ELECTROACOUSTICS TERMINOLOGY
BS 5969:1981 Specification for sound level meters
BS 6413-4:1983 Lubricants, industrial oils and related products (class L) Classification for family H (hydraulic systems)

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