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BS ISO 10767-1:2015

Current

Current

The latest, up-to-date edition.

Hydraulic fluid power. Determination of pressure ripple levels generated in systems and components Method for determining source flow ripple and source impedance of pumps

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-03-2016

€271.12
Excluding VAT

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Instrumentation
5 Pump installation
6 Test conditions and setting
7 Test rig
8 Test procedure
9 Test report
10 Identification statement (Reference to this
   part of ISO 10767)
Annex A (normative) - Test forms
Annex B (informative) - Two pressures/two systems method
Bibliography

Describes a test procedure for measuring the source flow ripple and source impedance of positive-displacement hydraulic pumps.

Committee
MCE/18/-/8
DevelopmentNote
Supersedes BS 6335-1(1990). (04/2005) Supersedes 93/716429 DC. (07/2005) Supersedes 13/30265678 DC. (03/2016)
DocumentType
Standard
Pages
40
PublisherName
British Standards Institution
Status
Current
Supersedes

This part of ISO10767 establishes a test procedure for measuring the source flow ripple and source impedance of positive-displacement hydraulic pumps. It is applicable to all types of positive-displacement pumps operating under steady-state conditions, irrespective of size, provided that the pumping frequency is in the range from 50Hz to 400Hz. Source flow ripple causes fluid borne vibration (pressure ripple) and then airborne noise from hydraulic systems. This procedure covers a frequency range and pressure range that have been found to cause many circuits to emit airborne noise which presents a major difficulty in design of hydraulic fluid power systems. Once the source flow ripple and source impedance of hydraulic fluid power pump are known, the pressure ripple generated by the pump in the fluid power system can be calculated by computer simulation using the known ripple propagation characteristics of the system components. As such, this part of ISO10767 allows the design of low noise fluid power systems to be realized by establishing a uniform procedure for measuring and reporting the source flow ripple and the source impedance characteristics of hydraulic fluid power pumps. In this part of ISO10767 , calculation is made for blocked acoustic pressure ripple as an example of the pressure ripple. An explanation of the methodology and theoretical basis for this test procedure is given in AnnexB . The test procedure is referred to here as the two pressures/two systems method. Ratings are obtained as follows: source flow ripple (in the standard “Norton” model) amplitude, in cubic meter per second[m 3/s], and phase, in degree, over 10 individual harmonics of pumping frequency; source flow ripple (in the modified model) amplitude, in cubic meter per second [m 3/s], and phase, in degree, over 10 individual harmonics of pumping frequency; and its time history wave form, source impedance amplitude, in Newton second per meter to the power of five [(Ns)/m 5]., and phase, in degree, over 10 individual harmonics of pumping frequency; blocked acoustic pressure ripple, in MPa (1MPa=10 6 Pa) or in bar (1 bar=10 5 Pa), over 10 individual harmonics of pumping frequency; and the RMS average of the pressure ripple harmonic f 1 to f 10.

Standards Relationship
ISO 10767-1:2015 Identical

ISO 5598:2008 Fluid power systems and components Vocabulary
ISO 15086-2:2000 Hydraulic fluid power — Determination of the fluid-borne noise characteristics of components and systems — Part 2: Measurement of the speed of sound in a fluid in a pipe

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