BS ISO 10302-2-2011 Acoustics Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices Structure-borne vibration measurements《声学 小型通风.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 10302-2:2011Acoustics Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devicesPart 2: Structure-borne vibration measurements

2、BS ISO 10302-2:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 10302-2:2011. The UK participation in its preparation was entrusted to T e c h n i c a l Committee EH/1/4, Machinery noise.A list of organizations represented on this committee can be obtained

3、on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 61910 6 ICS 17.140.20; 23.120 Compliance with a British Standard cannot confer immunity from legal obligatio

4、ns.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 10302-2:2011Reference numberISO 10302-2:2011(E)ISO 2011INTERNATIONAL STANDARD ISO10302-2First edition2011-06

5、-15Acoustics Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices Part 2: Structure-borne vibration measurements Acoustique Mesurage du bruit arien mis et des vibrations de structure induites par les petits quipements de ventilation Partie 2: Mesura

6、ge des vibrations de structure BS ISO 10302-2:2011ISO 10302-2:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and mic

7、rofilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO

8、2011 All rights reservedBS ISO 10302-2:2011ISO 10302-2:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Descriptors.2 5 Measurement uncertainty.3 6 Design and performance requirements for test fixture .3 7 Installation4 8

9、 Operation of AMDs 5 9 Instrumentation .6 10 Measurement procedure.7 11 Test report11 Annex A (informative) Suggested data format for presentation 13 Annex B (informative) Recommended voltages for testing AMDs that operate with variable speeds 18 Annex C (informative) Sample specification of AMD str

10、ucture-borne vibratory acceleration levels.19 Annex D (informative) Guidance on the development of information on measurement uncertainty 20 Bibliography24 BS ISO 10302-2:2011ISO 10302-2:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a wor

11、ldwide federation of national standards bodies (ISO member 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

12、 that committee. International organizations, governmental 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. International Standards are drafted

13、in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standar

14、d requires approval by at least 75 % of the member bodies casting a vote. Attention 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. ISO 10302-2 was prepared by

15、 Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. This first edition of ISO 10302-2, together with ISO 10302-1, cancels and replaces ISO 10302:1996. ISO 10302 consists of the following parts, under the general title Acoustics Measurement of airborne noise emitted and structure-bor

16、ne vibration induced by small air-moving devices: Part 1: Airborne noise measurement Part 2: Structure-borne vibration measurement BS ISO 10302-2:2011INTERNATIONAL STANDARD ISO 10302-2:2011(E) ISO 2011 All rights reserved 1Acoustics Measurement of airborne noise emitted and structure-borne vibration

17、 induced by small air-moving devices Part 2: Structure-borne vibration measurements 1 Scope This part of ISO 10302 covers vibration levels from small air-moving devices (AMDs) with mounting footprints of less than 0,48 m 0,90 m for the full-size test plenum defined in ISO 10302-1 and less than 0,18

18、m 0,3 m for the half-size plenum. It covers all types of AMDs which can be mounted on, and are self-supported at, the discharge or inlet plane of a test plenum box as specified in ISO 10302-1. The procedures defined in this part of ISO 10302 specify methods for determining the vibration levels that

19、a small AMD would induce in an average structure used in information technology and telecommunications equipment. The methods specified in this part of ISO 10302 allow the determination of induced vibration levels for the individual AMD that is tested. These data can be used to determine the statist

20、ical values of vibration levels for a production series if levels are measured for several units of that series. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated referen

21、ces, the latest edition of the referenced document (including any amendments) applies. ISO 266,Acoustics Preferred frequencies ISO 5348, Mechanical vibration and shock Mechanical mounting of accelerometers ISO 10302-1:2011, Acoustics Measurement of airborne noise emitted and structure-borne vibratio

22、n induced by small air-moving devices Part 1: Airborne noise measurement ISO 16063-11, Methods for the calibration of vibration and shock transducers Part 11: Primary vibration calibration by laser interferometry ISO 16063-21, Methods for the calibration of vibration and shock transducers Part 21: V

23、ibration calibration by comparison to a reference transducer IEC 61260, Electroacoustics Octave-band and fractional-octave-band filters ISO/IEC Guide 98-3, Uncertainty in measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) BS ISO 10302-2:2011ISO 10302-2:2011(E) 2 ISO

24、 2011 All rights reserved3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 10302-1 and the following apply. 3.1 vibratory acceleration level Laten times the logarithm to the base 10 of the ratio of the square of the root-mean-square acceleration, a, to

25、 the square of a reference value, a0, expressed in decibels 22010 lg dBaaLa=(1) where the reference value, a0, is 1 m/s2NOTE 1 The width of the frequency band is stated; for example, overall for all bands in the frequency range of interest or one-third-octave band. NOTE 2 Some other standards use ot

26、her reference values. NOTE 3 In this part of ISO 10302, “vibratory acceleration level” is frequently referred to simply as “acceleration level”. 3.2 frequency range of interest one-third-octave bands with centre frequencies specified in ISO 266, from 25 Hz to 5 kHz inclusive 3.3 information technolo

27、gy and telecommunications equipment ITT equipment equipment for information processing, and components thereof, used in homes, offices, server installations, telecommunications installations or similar environments ISO 7779:20103, 3.1.3 NOTE ISO 10302 is intended to support the designers of ITT equi

28、pment. 4 Descriptors The primary descriptor for vibration levels induced by an AMD is the energy average of the overall unweighted (non-frequency-weighted) vibratory acceleration level at the measurement locations for the frequency range of interest (3.2). This frequency range covers most of the fre

29、quency range covered by ISO 10302-1 for air-borne noise from AMDs, and adds the one-third-octave bands centred at 25 Hz to 80 Hz. The detailed descriptors are the unweighted one-third-octave band acceleration levels. Although the measurement apparatus and the procedures of this part of ISO 10302 can

30、 also be used in conjunction with narrow-band frequency analysis instrumentation to investigate specifics in more detail, such narrow-band analysis is not specified here. NOTE Acceleration measurements are convenient because non-intrusive lightweight accelerometers are readily available and simple t

31、o use. The overall unweighted acceleration level is chosen because it is a simple measure that correlates well with the A-weighted structure-borne noise level radiated by a structure (see References 7, 11). The A-weighted structure-borne noise level radiated from a vibrating structure is determined

32、from the average acceleration level of the structure by: a) converting from acceleration to velocity; b) correcting for the radiation efficiency of the structure; c) applying an A-weighting. To the first order, these three calculations cancel each other as a function of frequency, except for a const

33、ant. This leaves the overall unweighted acceleration level as a simple measure of the fan-induced A-weighted structure-borne noise. BS ISO 10302-2:2011ISO 10302-2:2011(E) ISO 2011 All rights reserved 35 Measurement uncertainty The uncertainty of results obtained from measurements in accordance with

34、this part of ISO 10302 shall be evaluated, preferably in compliance with ISO/IEC Guide 98-3. If reported, the expanded uncertainty together with the corresponding coverage probability as defined in ISO/IEC Guide 98-3 shall be given. Guidance on the determination of the expanded uncertainty is given

35、in Annex D. If, in a laboratory performing measurements in accordance with this part of ISO 10302, current knowledge is still insufficient to fully apply ISO/IEC Guide 98-3, the values of the standard deviation of reproducibility, R0given in Table 1, multiplied by a coverage factor of 2 to get an es

36、timate of the expanded uncertainty for a coverage probability of 95 %, are recommended for provisional use in test reports. Table 1 Estimated values of the standard deviation of reproducibility of vibratory acceleration levels of air-moving devices determined in accordance with this part of ISO 1030

37、2 Standard deviation of reproducibility Standard deviation of repeatability One-third-octave band centre frequency R0r0Hz dB dB 25 31 to 63 80 to 160 200 to 5 000 5,0 5,0 3,0 2,0 2,0 1,0 1,0 1,0 Overall 25 to 5 000 1,0 0,5 NOTE 1 These estimates are based on interlaboratory tests of five AMDs (three

38、 tube-axial fans and two forward-curved blowers) in the capacity range of 0,001 6 m3/s to 0,137 m3/s, conducted at two laboratories using three either half- or full-sized plenums by five different operators following the guidelines of ISO 57252(see References 7, 11). NOTE 2 The standard deviations o

39、f reproducibility reflect the cumulative effects of all causes of measurement uncertainty, including variations from laboratory to laboratory, but excluding variations in the acceleration level from specimen to specimen. The standard deviation of repeatability for the same specimen and the same labo

40、ratory measurement conditions is considerably smaller than the standard deviation of reproducibility. NOTE 3 The values apply to AMDs that are not damaged and are operating in a stable manner, under the test conditions defined in this part of ISO 10302. 6 Design and performance requirements for test

41、 fixture 6.1 Basic design 6.1.1 General The basic design of the test plenum shall be as specified in ISO 10302-1, except that the mounting panel specified in ISO 10302-1 shall be replaced by the damped panel specified in 6.2. 6.1.2 Flow rate The flow rate of the fan mounted on the plenum box under t

42、est conditions should be no greater than the value calculated according to Equation (2): ,0,max0VVqqVV= (2) BS ISO 10302-2:2011ISO 10302-2:2011(E) 4 ISO 2011 All rights reservedwhere qV,maxis the maximum volume flow rate of the scaled plenum, in cubic metres per second; qV,0is the maximum volume flo

43、w rate of the full-size plenum, in cubic metres per second, i.e. qV,0= 1 m3/s; V0is the nominal air volume of the full-size plenum defined in ISO 10302-1, in cubic metres, i.e. V0= 1,3 m3; V is the nominal air volume of the scaled plenum, in cubic metres. 6.1.3 Static pressure The static pressure of

44、 the AMD operating on the plenum should be no greater than 750 Pa. 6.1.4 Air/pressure distribution All relative geometries (such as locations and proportions of the mounting panel or the exit port) shall be the same as those of the full-size plenum of ISO 10302-1. 6.2 Damped panel The specification

45、on the plate stock is a mechanical mobility level (reference: 1 m/N s) of 45 dB from 25 Hz to 5 000 Hz when measured in the middle of a panel of dimensions 1,0 m2with no fan-mounting hole and with the panel freely suspended by two corners. The mobility level measurement should be made in accordance

46、with ANSI/ASA S2.3217. The tolerance on the mobility levels is 8 dB from 25 Hz to 100 Hz, 4 dB from 100 Hz to 200 Hz, and 2 dB from 200 Hz to 5 000 Hz. These tolerance limits ensure that the panel has sufficient damping to prevent excitation of the frame1). 6.3 Mounting area This part of ISO 10302 c

47、overs vibration levels from small AMDs with a maximum mounting footprint of up to 0,48 m 0,90 m for the full-size plenum. For all sizes of plenum, the distances from the edges of the AMD maximum mounting footprint to the edges of the damped panel are constant: 0,06 m from the top and bottom and 0,15

48、 m from the sides. (Thus for a half-sized plenum, this part of ISO 10302 covers AMDs with a maximum mounting footprint of up to 0,18 m 0,30 m.) 7 Installation 7.1 Orientation of the AMD The discharge side of the AMD shall be mounted on the damped panel if this is an available mounting option. If oth

49、er mounting options are used, they shall be reported. 7.2 Mounting of the AMD The AMD shall be mounted on a damped panel meeting the specifications of 6.2. Unless special mounting attachment devices are being evaluated, the AMD shall be attached to the damped panel with through-screws, as specified by the AMD manufacturer. The screws shall be tightened to the torque specified by the AMD manufacturer. In the absence of manufacturers specifications, M3.5 (UNC 6-32) through-screw