1、Ships and marine technology Test method of flow induced in-pipe noise source characteristics for a ship-used pumpBS ISO 20155:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Ships and marine technology Test method of flow induced in-pipe noise source cha
2、racteristics for a ship-used pumpNavires et technologie maritime Mthode pour dterminer les caractristiques des sources de bruit induites par lcoulement dans les tuyaux dune pompe de navireINTERNATIONAL STANDARDISO20155First edition2017-08Reference numberISO 20155:2017(E)National forewordThis British
3、 Standard is the UK implementation of ISO 20155:2017.The UK participation in its preparation was entrusted to Technical Committee SME/32, Ships and marine technology - Steering committee.A list of organizations represented on this committee can be obtained on request to its secretary.This publicatio
4、n does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 89010 9ICS 47.020.01Compliance with a British Standard cannot confer immunity from
5、 legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 20155:2017 ISO 2017Ships and marine technology Test method of flow ind
6、uced in-pipe noise source characteristics for a ship-used pumpNavires et technologie maritime Mthode pour dterminer les caractristiques des sources de bruit induites par lcoulement dans les tuyaux dune pompe de navireINTERNATIONAL STANDARDISO20155First edition2017-08Reference numberISO 20155:2017(E)
7、BS ISO 20155:2017ISO 20155:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
8、including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, Switzerland
9、Tel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 20155:2017ISO 20155:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utiliz
10、ed otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright
11、officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 20155:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Two-port source model and test method of source characteri
12、stic of pump . 24.1 Two-port source model of a pump 24.2 Test methods for source characteristic parameters of the pump . 35 Test rig . 45.1 Test loop 45.2 Installation of test pump 55.3 Ground foundation and supporting structure . 65.4 Test-bed pipeline . 65.5 Test section . 65.6 Throttling valve 65
13、.7 Secondary acoustic exciter . 75.8 Water tank. 76 Instrumentation 76.1 General . 76.2 Static measurements 76.3 Dynamic measurements . 77 Test preparation . 88 Test procedure 89 Data processing . 99.1 General . 99.2 Passive characteristic of noise source . 99.3 Active characteristic . 910 Evaluatio
14、n criteria for the test result 911 Test report 1011.1 Overview . 1011.2 General information 1011.3 Test record . 1111.4 Test result . 11Annex A (informative) Theoretical models of a two-port source and transformation mutually between matrix Z, S, T .13Annex B (informative) Evaluation of quantities a
15、t inlet and outlet ports.15Annex C (informative) Judgment of effectiveness for the test .17Annex D (informative) Formulae for determining passive characteristics of noise source .19Annex E (informative) Formulae for determining active characteristics of source 20Annex F (informative) Verification of
16、 test method taking a T-shaped sound excitor as a two-port acoustic source .21Bibliography .24 ISO 2017 All rights reserved iiiContents PageBS ISO 20155:2017ISO 20155:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO m
17、ember bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governm
18、ental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenanc
19、e are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attenti
20、on is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction a
21、nd/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms
22、and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 8
23、, Ships and marine technology, Subcommittee SC 8, Ship design.iv ISO 2017 All rights reservedBS ISO 20155:2017ISO 20155:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internatio
24、nal Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO
25、, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part
26、 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the
27、 elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations re
28、ceived (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessmen
29、t, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC
30、8, Ship design.iv ISO 2017 All rights reserved ISO 20155:2017(E)IntroductionIn hydraulic fluid power systems of ships, power is transmitted through a liquid under pressure. Pumps are components that convert rotary mechanical power into hydraulic fluid power. During the process of converting mechanic
31、al power into hydraulic power, flow and pressure fluctuations and structure-borne vibrations are generated. These fluid-borne and structure-borne vibrations, which are generated primarily by the unsteady flow produced by the pump, are transmitted through the connected piping system.The fluid-borne v
32、ibration generated by a pump is called pressure ripple or flow induced noise. For pumps used for coolant and drainage in ships, flow induced noise can be transmitted along the piping and radiated into the surrounding water area through a pipe mouth outboard the ship, which produces noise pollution a
33、nd disturbs the environment including marine mammals.The level of flow induced noise for a pump depends upon not only the characteristics of the pump itself, but also the circuit in which the pump is installed. Thus, the determination of flow induced noise by a pump is complicated by the interaction
34、 between the pump and the circuit. The directly measured data using hydrophones inserted in pipe reaches connecting the pump cannot reflect noise source characteristics of the pump. The method adopted to measure the flow induced noise of a pump should be such as to eliminate the interaction.ISO 1076
35、7-1 and ISO 10767-2 provide the test methods for the positive displacement pump with the precision and simplified method, respectively, where the pump is treated as a single port acoustic source and its source characteristics expressed by two parameters of source strength as well as source impedance
36、 can be obtained. For other common pumps with two ports, the sound field between the inlet and outlet of a pump is inter-coupling, source characteristics cannot be fully expressed by two parameters, but expressed by up to six parameters, i.e. source pressures at the inlet and outlet of a pump and fo
37、ur elements in a 2 2 impedance matrix. There is a need to establish a new standard about a test method for noise source characteristics of a pump, based on two-port acoustic source model.The source characteristics of flow induced noise are used for evaluating the hydrodynamic noise feature of the pu
38、mp. The measured results can be compared for pumps of different types and manufacture. This will enable the pump designer to evaluate the effects of design modifications and help hydraulic system designers to avoid selecting pumps having high noise levels.The method is based upon the application of
39、plane wave transmission line theory to the analysis of noise propagation in hydraulic systems. By adopting a two-port model with noise source and evaluating the impedance characteristics of the pump using a secondary-source method, it is possible to obtain the source strength of the pump, independen
40、t of the circuit that the pump locates. ISO 2017 All rights reserved vBS ISO 20155:2017BS ISO 20155:2017Ships and marine technology Test method of flow induced in-pipe noise source characteristics for a ship-used pump1 ScopeThis document specifies a test method for determining flow induced in-pipe n
41、oise source characteristics of a ship-used pump as a two-port sound source in laboratory conditions by measuring acoustic pressures in the pipe reaches of inlet and outlet.The test method is applicable to all types of centrifugal pumps with a diameter over 50 mm operating under steady conditions.The
42、 suitable frequency range of the test method is about 10 Hz to 1 000 Hz, and the upper frequency is dependent on the inner diameter of the pipe, in which the plane acoustic wave propagates.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of the
43、ir content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 10767-1:2015, Hydraulic fluid power Determination of pressure ripple levels generat
44、ed in systems and components Part 1: Method for determining source flow ripple and source impedance of pumpsIEC 60565, Underwater acoustics Hydrophones Calibration in the frequency range 0,01 Hz to 1 MHz3 Terms and definitionsFor the purposes of this document, the following terms and definitions app
45、ly.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1two-port sourcetest object with inlet and outlet which
46、are inter-coupling acoustically3.2passive characteristicacoustic characteristic of a test object only acting as a transmission path, which can be indicated by different manners such as a transfer matrix, impedance matrix, scattering matrix, etc.3.3active characteristicacoustic characteristic of a te
47、st object which provides acoustic energy into a piping systemNote 1 to entry: Depending on the adopted theoretical model, active characteristics can be represented by acoustic pressure source, volume velocity source, etc.INTERNATIONAL STANDARD ISO 20155:2017(E) ISO 2017 All rights reserved 1BS ISO 2
48、0155:2017ISO 20155:2017(E)3.4test sectionpipe reaches which are used to fix the hydrophones, measuring the in-pipe noise from the acoustic source3.5static pressure in pipefluid pressure in pipe as fluid is in still, which is one of the parameters describing the working conditions of the test object3
49、.6working flowratefluid volume or mass per unit time, which is one of the working parameters of the test object3.7pressure drop/hydraulic lossstatic pressure difference between the inlet and outlet as the fluid passes through the test object, which is a reference parameter for analysis use3.8foundationplatform built by ferroconcrete, used to install the experimental facility and test objects, including ground basis, guide rail for convenient mount of pipeline4 Two-port source model and test method of source charac
