BS 5944-4:1984
Current
The latest, up-to-date edition.
Measurement of airborne noise from hydraulic fluid power systems and components Method of determining sound power levels from valves controlling flow and pressure
Hardcopy , PDF
English
03-30-1984
Foreword
Committees responsible
Method
0 Introduction
1 Scope
2 Definitions
3 Measurement uncertainty
4 Test environment
5 Instrumentation
6 Installation conditions for valve
7 Operating conditions
8 Location and number of sound measurement points
9 Test procedure
10 Calculation of valve 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
14 Identification statement
Appendices
A Guidance on valve instability and its detection
B Guidance on measuring in an anechoic chamber
C Errors and classes of measurement
Tables
1 Standard deviation of sound power level
determination
2 Environmental qualification procedures
3 Flow settings
4 Pressure settings
5 Limit of variations in test conditions
6 Permissible systematic errors of measuring
instruments as determined during calibration
Figures
1 Example of test installation in an anechoic chamber
2 Relationship between the reference box and
hemispherical measurement surface
3 Coiling of return hose
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