1、BRITISH STANDARD CONFIRMED SEPTEMBER1992 BS6805-4: 1987 ISO7574-4: 1985 EN27574-4: 1988 Incorporating Amendment No.1 Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part4: Methods for determining and verifying stated values for batches of mac
2、hines ISO title: Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part4: Methods for stated values for batches of machines UDC 534.6:534.835.46:519.22BS6805-4:1987 This British Standard, having been prepared under the directionof the
3、 Environment andPollution Standards Committee, was published underthe authority of the BoardofBSI and comes into effecton 30 January1987 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference EPC/1 Draft for comment84/52397 DC ISBN 0 580 15557 9 Committees r
4、esponsible for this British Standard The preparation of this British Standard was entrusted by the Environment and Pollution Standards Committee (EPC/-) to Technical Committee EPC/1, upon which the following bodies were represented: Association of Consulting Engineers British Broadcasting Corporatio
5、n British Occupational Hygiene Society British Telecommunications plc Department of Health and Social Security Department of the Environment (Building Research Establishment) Department of Trade and Industry (Air Division) Department of Trade and Industry (National Physical Laboratory) Engineering E
6、quipment and Materials Users Association Health and Safety Executive Incorporated Association of Architects and Surveyors Institute of Acoustics Institute of Occupational Hygienists Institute of Physics Institute of Sound and Vibration Research Institution of Civil Engineers Institution of Electroni
7、c and Radio Engineers Petroleum Industry Association Royal Institute of British Architects Society of Environmental Engineers Transmission and Distribution Association (BEAMA Limited) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Advanc
8、ed Manufacturing Technology Research Institute Agricultural Engineers Association British Compressed Air Society British Engine Group of the Society of Motor Manufacturers and Traders British Steel Corporation Business Equipment Trade Association Cement Makers Federation Department of Trade and Indu
9、stry (National Engineering Laboratory) Hevac Association Institution of Mechanical Engineers Institution of Production Engineers Rotating Electrical Machines Association (BEAMA Ltd.) Amendments issued since publication Amd. No. Date of issue Comments 6301 April 1990 Indicated by a sideline in the ma
10、rginBS6805-4:1987 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Brief history 2 Text of EN 27574-4 3 Publications referred to Inside back coverBS6805-4:1987 ii BSI 01-2000 National foreword This Part of BS6805 has been prepared under the direction of the
11、Environment and Pollution Standards Committee and is identical with ISO7574-4:1985 “Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part4: Methods for stated values for batches of machines”. The standard was prepared by subcommittee
12、1, Noise, of Technical Committee43, Acoustics, of the International Organization for Standardization (ISO) with the active participation and approval of the UK. In1988 the European Committee for Standardization (CEN) accepted ISO7574-4:1985 as European Standard EN27574-4:1988. BS6805 at present comp
13、rises the following Parts. Part1: Glossary of terms; Part2: Method for determining and verifying stated values for individual machines; Part3: Method for determining and verifying stated values for batches of machines using a simple (transition) method; Part4: Methods for determining and verifying s
14、tated values for batches of machines. Further Parts of BS6805 will be prepared, if required. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not ide
15、ntical with those used in British Standards; attention is drawn especially to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “ISO7574” or “part of ISO7574
16、” appear, referring to this standard, they should be read as “BS6805” or “Part of BS6805” respectively. Cross-references International Standard Corresponding British Standard BS4196 Sound power levels of noise sources ISO3741:1975 Part1:1981 Precision methods for determination of sound power levels
17、for broad-band sources in reverberation rooms (Identical) ISO3742:1975 Part2:1981 Precision methods for determination of sound power levels for discrete-frequency and narrow-band sources in reverberation rooms (Identical) ISO3743:1976 Part3:1981 Engineering methods for determination of sound power l
18、evels for sources in special reverberation test rooms (Identical) ISO3744:1981 Part4:1981 Engineering methods for determination of sound power levels for sources in free-field conditions over a reflecting plane (Identical) ISO3745:1977 Part5:1981 Precision methods for determination of sound power le
19、vels for sources in anechoic and semi-anechoic rooms (Identical)BS6805-4:1987 BSI 01-2000 iii The Technical Committee has reviewed the provisions of ISO4871, to which reference is made in the text for information only, and has decided that they are acceptable for use in conjunction with this standar
20、d. NOTETextual error. When adopting the text of the International Standard, the textual error given below was discovered. It has been marked in the text and has been reported to ISO in a proposal to amend the text of the International Standard. In the last line ofB.2.2, delete “ISO7574-4” and substi
21、tute “ISO7574-1”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International Standard
22、Corresponding British Standard ISO3951:1981 BS6002:1979 Specification for sampling procedures and charts for inspection by variables for percent defective (Technically equivalent) ISO5725:1981 BS5497 Precision of test methods Part1:1979 Guide for the determination of repeatability and reproducibilit
23、y for a standard test method (Technically equivalent) BS6805 Statistical methods for determining and verifying stated noise emission values of machinery and equipment ISO7574-1:1985 Part1:1987 Glossary of terms (Identical) ISO7574-3:1985 Part3:1987 Method for determining and verifying stated values
24、for batches of machines using a simple (transition) method (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, theENtitle page, pages2 to18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had
25、 amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN27574-4 December1988 UDC 534.6:534.835.46:519.22 Key words: Acoustics, noise: sound, engine noise, statistical quality control, statistical an
26、alysis, sampling, standard deviation English version Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part4: Methods for stated values for batches of machines (ISO7574-4, edition1985) Acoustique; Mthodes statistiques pour la dtermina
27、tion et le contrle des valeurs dclares dmission acoustique des machines et quipements; Partie4: Mthodes pour valeurs dclares de lots de machines (ISO7574-4, dition1985) Akustik; Statistische Verfahren zur Festlegung und Nachprfung angegebener (oder vorgegebener) Geruschemissionswerte von Maschinen u
28、nd Gerten; Teil4: Verfahren fr Angaben (oder Vorgaben) fr Maschinenlose (ISO7574-4, Ausgabe1985) This European Standard was accepted by CEN on15 November1988. CEN members are bound to comply with the requirements of the CEN/CENELEC Rules which stipulate the conditions for giving this European Standa
29、rd the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in the official versions (English, French,
30、 German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finlan
31、d, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Bruss
32、els CEN1988 Copyright reserved to all CEN members Ref.No.EN27574-4:1988EEN27574-4:1988 BSI 01-2000 2 Brief history The Technical Board decided with Resolution BT84/1988, to submit the International Standard ISO7574-4:1985, “Acoustics; Statistical methods for determining and verifying stated noise em
33、ission values of machinery and equipment Part4:Methods for stated values for batches of machines”. to the Formal Vote. Since this standard passed the Formal Vote positively without modification, it was approved by CEN as European Standard EN27574-4. In accordance with the Common CEN/CENELEC Rules, t
34、he following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. Statement The text of the International Standard ISO7574
35、-4, edition1985 was approved by CEN as a European Standard without any modification. Contents Page Brief history 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 3 Definitions 3 4 General 3 5 Guidelines for the determination of the labelled value, L c , by the labeller 4 6 Verify
36、ing the labelled value for a batch of machines 5 7 Information to be given in a specific labelling code for a specific family of machines 7 Annex A Operating characteristic curves and examples of single, doubleandsequential sampling 8 Annex B Guidelines for estimating standard deviations and for the
37、 useofoperating characteristic curves 11 Annex C List of symbols 16 Bibliography 17 Figure 1 Operating characteristic curves (OCs) for single (doubleandsequential) sampling 8 Figure 2 Relation between and sample size n 10 Figure 3 Change of the operating characteristiccurve for t s M 15 Table 1 Acce
38、ptability constant k for differentsample sizes n 5 Table 2 Acceptability constants k a , k rand k d for double samplingandequivalent sample sizes (single/double) 6 Table 3 Acceptability values a, b and r for sequential samplingandequivalentsample sizes(single/sequential) 6 Table 4 Measured values, L
39、 i , and original data 12 Table 5 Computational formulae and numericalresults 12 Table 6 Measured values 13 Table 7 Quantiles of the standardized normaldistribution 13 %L M -EN27574-4:1988 BSI 01-2000 3 0 Introduction A general introduction to the four-part series of ISO7574 is given in ISO7574-1. F
40、or the purposes of this part of ISO7574, the term “labelled value” stands for all kinds of stated value (e.g.information on a label, the upper noise limit set by an authority, the agreed contract value) for which the methods may be applied. This part of ISO7574 contains statistical sampling methods
41、for checking the stated noise emission values for batches (lots) of machines. The labelled value for all machines in a batch is checked by sampling procedures. A reference standard deviation is required when testing the compliance of a batch of a specific family of machines. In addition, information
42、 on the type of sampling to be used (single, double or sequential) and the sample size is required. The procedures specified in this part of ISO7574 assume that the noise emission values of a batch (lot) of machines will follow a normal distribution. The statistical parameters upon which this part o
43、f ISO7574 is based assume that there is a95% probability of acceptance if no more than6,5% of the noise emission values in a batch exceed the labelled value. Information is included to assist the labeller in determining a labelled value based on these statistical parameters. The methods given in thi
44、s part of ISO7574 ensure that a batch (lot) of machines labelled in accordance with the specifications for the verification procedure have a predetermined probability of acceptance. 1 Scope and field of application This part of ISO7574 provides guidelines for determining the labelled value, L c , by
45、 the labeller and specifies statistical sampling procedures for verifying compliance of the noise emissions of a batch (lot) of machinery and equipment with its labelled value. This part of ISO7574 is intended to assist those parties responsible for drawing up specific labelling codes for specific f
46、amilies of machines. It is also intended to be of use to labellers who want their batches of machines to conform with verification procedures that are in accordance with the specifications given in the specific labelling codes based on clause7. This part of ISO7574 does not deal with the consequence
47、s that ensue if the stated value is not confirmed as verified for a batch (lot) of machines. 2 References ISO3951, Sampling procedures and charts for inspection by variables for percent defective. ISO4871, Acoustics Noise labelling of machinery and equipment. ISO7574-1, Acoustics Statistical methods
48、 for determining and verifying stated noise emission values of machinery and equipment Part1:General considerations and definitions. 3 Definitions For the purposes of this part of ISO7574, the definitions given in ISO7574-1 apply. 4 General For a batch of machines, the noise emission values will cov
49、er a certain range due to the variability between the machines (relevant measure: standard deviation of production, p ) and due to measurement errors occurring under reproducibility conditions (relevant measure: standard deviation of reproducibility, R see3.17 in ISO7574-1). The measure for the overall variability is the total standard deviation, t . The aim of labelling a batch of machines is to indicate as labelled value, L c , a limit below which a specified large proportion of the no
