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GB/T 41980.1-2022Hydraulic fluid power - Determination method of pressure ripple levels generated in systems and components - Part 1: Hydraulic pumps(precise method) (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 12, 2022

Implementation date

October 12, 2022

Scope

GB/T 41980.1-2022 (Hydraulic fluid power - Determination method of pressure ripple levels generated in systems and components - Part 1: Hydraulic pumps(precise method)) is available as an English-translated PDF.

GB/T 41980.1-2022 is the Chinese standard "Hydraulic fluid power - Determination method of pressure ripple levels generated in systems and components - Part 1: Hydraulic pumps(precise method)".

Its scope clause reads: This document establishes a test procedure for source flow pulsation and source impedance of positive displacement hydraulic pumps. This document applies to all types and sizes of volumes with pumping frequencies in the range of 50 Hz to 400 Hz under steady state conditions type pump.

This document uses the calculation of high impedance pressure fluctuations as an example. The methodology and rationale for the test procedure are explained in Appendix A. Measurement The test procedure is called the dual pressure/dual system method.

The ratings are as follows. a) source flow pulsation (in standard Norton model) amplitude (m3/s) and phase (°) over 10 individual pump frequency harmonics; b) source flow pulsation (in the corrected model) amplitude (m3/s), phase (°) and time-domain waveforms for more than 10 individual pump frequency harmonics; c) source impedance magnitude (N s/m5) and phase (°) for more than 10 individual pump frequency harmonics; d) High impedance pressure fluctuations (MPa) over 10 individual pumping frequency harmonics, rms square of pressure fluctuation harmonics f1~f10 mean. Its clauses include terms and definitions.

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Document preview — GB/T 41980.1-2022

National Standard of the People's Republic of China

ICS: 23.100.10
Classification: J 20

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Meter
5 Installation of the pump
6 Test Conditions and Setup
7 Test bench
8 Test procedure
9 Test report
10 Notes (in accordance with this document)
Appendix A (Informative) Dual Pressure/Dual System Method
Appendix B (Normative) Test Form

1 Scope

This document establishes a test procedure for source flow pulsation and source impedance of positive displacement hydraulic pumps.

This document applies to all types and sizes of volumes with pumping frequencies in the range of 50 Hz to 400 Hz under steady state conditions type pump.

This document uses the calculation of high impedance pressure fluctuations as an example. The methodology and rationale for the test procedure are explained in Appendix A. Measurement

The test procedure is called the dual pressure/dual system method. The ratings are as follows.

a) source flow pulsation (in standard Norton model) amplitude (m3/s) and phase (°) over 10 individual pump frequency harmonics;

b) source flow pulsation (in the corrected model) amplitude (m3/s), phase (°) and time-domain waveforms for more than 10 individual pump frequency harmonics;

c) source impedance magnitude (N s/m5) and phase (°) for more than 10 individual pump frequency harmonics;

d) High impedance pressure fluctuations (MPa) over 10 individual pumping frequency harmonics, rms square of pressure fluctuation harmonics f1~f10 mean.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 17446 Vocabulary of Fluid Transmission Systems and Components (GB/T 17446-2012, ISO 5598.2008, IDT)

3 Terms and Definitions

GB/T 17446 as well as the following terms and definitions apply to this document.

3.1 sourceflowripple

The flow pulsation component generated in the pump (independent of the characteristics of the connecting circuit).

Note 1.Since there are two definitions of pump source flow pulsation, they need to be used differently.

--- The source flow pulsation in the standard Norton model, QS is the source flow pulsation assumed to be generated at the pump outlet, as shown in Figure 1a);

--- Correct the source flow pulsation in the model, Q*S is the source flow pulsation assumed to be inside the end of the outlet pipe, as shown in Figure 1b).

Note 2.According to the size and structure of the pump, the physical properties and operating conditions of the fluid, the theoretical pump source flow pulsation and correction model calculated by computer simulation

The pump flow pulsation in Q*S is comparable. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 44 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 5598.2008

Cited by

GB/T 41980.2-2022Hydraulic fluid power - Determination method of pressure ripple levels generated in systems and components - Part 2: Hydraulic pumps(simplified method)

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