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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 44050.1-2024: Hydraulic fluid power - Determination of fluid-borne noise characteristics of components and systems - Part 1: Introduction Status: Valid
Basic dataStandard 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 ContentsPreface 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 6ForewordThis 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:IntroductionIn 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: General1 ScopeThis 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 referencesThe 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 definitionsThe 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: ...... |
