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GB/T 44050.1-2024: Hydraulic fluid power - Determination of fluid-borne noise characteristics of components and systems - Part 1: Introduction
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Hydraulic fluid power - Determination of fluid-borne noise characteristics of components and systems - Part 1: Introduction
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GB/T 44050.1-2024
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Basic data | Standard ID | GB/T 44050.1-2024 (GB/T44050.1-2024) | | Description (Translated English) | Hydraulic fluid power - Determination of fluid-borne noise characteristics of components and systems - Part 1: Introduction | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J20 | | Classification of International Standard | 23.100.01 | | Word Count Estimation | 14,146 | | Date of Issue | 2024-05-28 | | Date of Implementation | 2024-05-28 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44050.1-2024: Hydraulic fluid power - Determination of fluid-borne noise characteristics of components and systems - Part 1: Introduction
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23:100:01
CCSJ20
National Standards of People's Republic of China
Determination of Noise Characteristics of Hydraulic Transmission Oil
Part 1: General
(ISO 15086-1:2001,MOD)
Released on 2024-05-28
2024-05-28 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols 2
5 Basic Models and Theories 3
6 Tests and measurements 6
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document is part 1 of GB/T 44050 "Determination of noise characteristics of hydraulic transmission oils": GB/T 44050 has been published in
Lower part:
--- Part 1: General;
--- Part 2: Measurement of sound velocity of oil in pipelines:
This document is modified to adopt ISO 15086-1:2001 "Determination of noise characteristics of hydraulic transmission oils Part 1: General principles":
The technical differences between this document and ISO 15086-1:2001 and their reasons are as follows:
--- The scope of this document (see Chapter 1, Chapter 1 of ISO 15086-1:2001) has been changed to adapt to the technical conditions of my country;
--- ISO 5598 (see Chapter 3) has been replaced by the normative reference GB/T 17446 to adapt to my country's technical conditions and improve operability:
Sex;
--- "3:7~3:10, 3:12" (see Chapter 3 of ISO 15086-1:2001) has been deleted from the terms and definitions to comply with the Chinese version:
rule;
--- Changed formula (5) to formula (8) (see 5:3, 5:3 of ISO 15086-1:2001) to maintain consistency with relevant standards;
--- Added some symbols (see Table 1) to comply with my country's writing rules:
The following editorial changes were made to this document:
--- The symbols in Chapter 4 are presented in the form of a table, and the units of the symbols are added;
--- Added piping examples (see Figure 3 and Figure 4);
--- Changed the symbols and units of the horizontal and vertical axes in Figures 1 and 2;
--- Corrected the editorial errors of ISO 15086-2:2000, adjusted the numbering of all formulas in order, and
One reference;
---Removed references:
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document was proposed by the China Machinery Industry Federation:
This document is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee (SAC/TC3):
This document was drafted by: Zhejiang University, Anhui Leguan Intelligent Technology Co:, Ltd:, Foshan Shunde District Quality and Technical Supervision Standards and Coding
Institute, Xiamen University, Beijing Institute of Automation of Mechanical Industry Co:, Ltd:, Wuhan University of Science and Technology, Ningbo Huaye Machinery Manufacturing Co:, Ltd:, Gongqing
Science and Technology Vocational College, National Intelligent Manufacturing Equipment Product Quality Supervision and Inspection Center (Zhejiang), China Machinery Engineering Academy Group Haixi (Fujian) Branch
Co:, Ltd:, Jiangsu Guorui Hydraulic Machinery Co:, Ltd:
The main drafters of this document are: Xu Bing, Ye Shaogan, Luo Jing, Chen Xinyuan, Wei Xin, Xu Dichun, Zhang Ce, Liu Jinhua, Zheng Zhijian, Zhan Wen, Ruan Ruiyong,
Linquan:
Introduction
In hydraulic fluid power systems, power is transmitted and controlled by pressurized fluid in a closed circuit:
In the process of generating fluid power, fluid noise (flow fluctuation and pressure fluctuation) will be generated, which will lead to structure-borne noise and air noise:
The transmission of sound is affected by the impedance of the components in the hydraulic circuit:
GB/T 44050 aims to standardize the determination of noise characteristics of hydraulic components and system oils and consists of three parts:
--- Part 1: General: The purpose is to provide a transfer matrix theory for determining the noise characteristics of hydraulic components and system oils,
Provides guidance for determining the characteristics of oil noise:
--- Part 2: Measurement of sound velocity of oil in pipelines: The purpose is to determine the sound velocity of oil in pipelines by measuring the pressure sensor installed in the pipeline:
Method for measuring the speed of sound in a closed oil in a pipeline:
--- Part 3: Measurement of hydraulic impedance: The purpose is to determine the hydraulic impedance of the hydraulic element by measuring the pressure sensor installed in the pipeline:
The method of measuring the impedance characteristics of the device:
At present, many methods have been developed to describe the generation and propagation of oil noise in hydraulic systems: Among them, the transfer matrix method can be used to describe the generation and propagation of oil noise in hydraulic systems:
It can best describe the physical behavior of the component and provide a suitable basis for measuring the characteristics of the component:
Determination of Noise Characteristics of Hydraulic Transmission Oil
Part 1: General
1 Scope
This document provides a transfer matrix theory for determining the characteristics of hydraulic components and system oil noise, providing a basis for determining the characteristics of oil noise:
guide:
This document is applicable to the measurement of oil noise in the frequency range of 10Hz~3000Hz in the hydraulic transmission circuit under steady-state conditions:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 17446 Fluid power systems and components vocabulary (GB/T 17446-2024, ISO 5598:2020, MOD)
3 Terms and definitions
The terms and definitions defined in GB/T 17446 and the following apply to this document:
3:1
flow ripple
Changes in flow rate of hydraulic fluid:
3:2
pressure ripple
The varying component of pressure in the hydraulic fluid caused by the interaction of flow fluctuation sources with the system:
3:3
A hydraulic device that generates flow fluctuations in a circuit, which results in pressure fluctuations, or generates pressure fluctuations in a circuit, which results in flow fluctuations:
element:
3:4
fundamentalfrequency
The lowest frequency of pressure fluctuation (or flow fluctuation) analyzed theoretically or measured by an instrument:
Example 1:
The fundamental frequency of a hydraulic pump or hydraulic motor with a rotation speed of N (r/s) is N (Hz): For a hydraulic pump or motor with k displacement components, if
If there is no obvious measurement deviation, the fundamental frequency can also be taken as N (kHz):
Example 2:
The digital frequency analyzer defines the fundamental frequency based on the frequency of the first spectral line:
3:5
Harmonic
Sinusoidal components of pressure or flow fluctuations that occur at integer multiples of the fundamental frequency:
Note: Harmonics can be expressed in terms of amplitude and phase, or in terms of their real and imaginary parts:
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