1、Statistical methods for determining and verifying stated noise emission values of machinery and equipment Methods for stated values for batches of machines Enalich version of DIN EN 27 574 Part 4 (IS0 7574-4 : 1985) This standard incorporates the English version of Is0 7574-4. DIN EN 27 574 Part 4 A
2、kustik; statistische Verfahren zur Festlegung und Nachpr- fung angegebener (oder vorgegebener) Geruschemissions- werte von Maschinen und Gerten; Verfahren fr Angaben (oder Vorgaben) fr Maschinenlose (IS0 7574-4 : 1985) European Standard EN 27 574-4 : 1989 has the status of a DIN Standard. A comma is
3、 used as the decimal marker. National foreword This standard has been published in accordance with a decision made by CEN/BT to adopt, without alteration, International Standard IS0 7574-4 : 1985 as a European Standard. The responsible German body involved in its preparation was the Normenausschu Ak
4、ustik, Lrmminderung und Schwingungstechnik (Acoustics, Noise Control and Vibration Engineering Standards Committee). The DIN Standards corresponding to the International Standards and the IEC Publication referred to in clause 2 of the EN are as follows: IS0 Standard DIN Standard IS0 3534 IS0 3741, I
5、S0 3742 IS0 3743 IS0 3744, IS0 3745, IS0 3746 IS0 3951 IS0 4871 IS0 5725 IS0 7574-1 IS0 7574-2 IS0 7574-3 IS0 7574-4 IEC 651 Conforms in substance with the DIN 55 350 series, particularly Parts 13 and 31 Conforms in substance with DIN 45 635 Part 2. Conforms in substance with DIN 45 635 Part 3. Conf
6、orms in substance with DIN 45 635 Part 1, specifically, the basic measurement method for grade 1 accuracy is covered in IS0 3745, for grade 2 accuracy, in IS0 3744, and for grade 3 accuracy, in IS0 3746. Will be adopted as a DIN IS0 Standard. Related in substance to DIN 45 649 Parts 1 and 2. DIN IS0
7、 5725 DIN EN 27 574 Part 1 DIN EN 27 574 Part 2 DIN EN 27 574 Part 3 DIN EN 27 574 Part 4 DIN IEC 651 Continued overleaf. EN comprises 16 pages. Beuth Verlag GrnbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 06 93 D/d fN 27 574 airborne noise emission; enveloping surf
8、ace method: basic method, divided into 3 grades of accuracy DIN 45 635 Part 2 Measurement of noise emitted by machines; airborne noise measurement; reverberation room method; basic measurement method (precision method, grade 1) DIN 45 635 Part 3 Measurement of noise emitted by machines; airborne noi
9、se measurement; special reverberation room method; basic measurement method (precision method, grade 2) DIN 45 649 Part 1 Acoustics; verifiable noise emission levels of machinery; single values DIN 45 649 Part 2 Acoustics; verifiable noise emission levels of machinery in the form of splitted values
10、DIN EN 27 574 Part 1 Acoustics; statistical methods for determining and verifying stated noise emission values of machinery and equipment; general considerations and definitions (IS0 7574-1 : 1985) DIN EN 27 574 Part 2 Acoustics; statistical methods for determining and verifying stated noise emissio
11、n values of machinery and equipment; methodsfor stated valuesfor individual machines (IS0 7574-2 : 1985) DIN EN 27 574 Part 3 Acoustics; statistical methods for determining and verifying stated noise emission values of machinery and equipment; simplified method for stated values for batches of machi
12、nes Terminology in quality assurance and statistics (IS0 7574-3 : 1985) DIN 55 350 series International Patent Classification G 10 K 11/16 G O1 N 29/00 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 27 574-4 December 1988 UDC 534.61 : 534.835.46 : 620.1 Descriptors: Acoustics, noise, sound, en
13、gine noise, statistical quality control, statistical analysis, sampling, standard deviation. English version Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part 4: Methods for stated values for batches of machines (IS0 7574-4 1985)
14、 Acoustique; mthodes statistiques pour la dtermination et le contrle des valeurs dclares dmission acou- stique des machines et quipements. Partie 4: Mthodes pour valeurs dclares de lots de machines Akustik; statistische Verfahren zur Fest- legung und Nachprfung angegebener (oder vorgegebener) Gerusc
15、hemissi- onswerte von Maschinen und Gerten. Teil 4: Verfahren fr Angaben (oder Vor- gaben) fr Maschinenlose (IS0 7574-4 : 1985) (IS0 7574-4 : 1985) This European Standard was approved by CEN on 1988-11-15 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the C
16、ENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibiiographicai references concerning such national standards may be obtained on application to the Central Secretariat or to
17、 any CEN member. This European Standard exists in three official versions (English. French, German). Aversion in any other language made by translation under the responsibility of a GEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
18、 CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation
19、Europisches Komitee fr Normung Centrai Secretariat: rue de Stassart 36, B-1050 Brussels O 1988. Copyright reserved to all CEN members. Ref. No. EN 27 574-4 : 1988 E Page 2 EN 27 574-4 : 1988 Foreword In 1988, CEN/BT decided to submit International Standard IS0 7574-4 : 1985 Acoustics; statistical me
20、thods for determining and verifying stated noise emission values of machinery and equipment: methods for stated values for batches of machines to Formal Vote. The result was positive. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European
21、 Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard IS0 7574-4 : 1985 was approved by CEN as a European Sta
22、ndard without any modification. O 1 2 3 4 5 6 6.1 6.2 6.3 6.4 7 Annexes A B C Contents Page Introduction . 3 Scope and field of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 References 3 Definitions 3 G
23、eneral . 3 Guidelines for the determination of the labelled value, L, by the labeller . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Verifying the labelled value for a batch of machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 General .
24、 5 Single sampling inspection 5 Double sampling inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Sequential sampling inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Information to be given in a specific labelling code for a specific family of machines . . . . . . . . . . . . . . . . . . 7 Operating characteristic curves and examples of single, double and sequential sampling . . . . . . . . . . . . . . 8 Gu
26、idelines for estimating standard deviations and for the use of operating characteristic curves _._._._._._._. 11 List of symbols . 16 Bibliography . 16 Page 3 EN 27 574-4 : 1988 O introduction A general introduction to the four-part series of IS0 7574 is given in IS0 7574/1. For the purposes of this
27、 part of IS0 7574, 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 con- tract value) for which the methods may be applied. This part of IS0 7574 contains statistical sampling methods for checking the s
28、tated noise emission values for batches (lots1 of machines. The labelled value for all machines in a batch is checked by sampling procedures. A reference standard devia- tion is required when testing the compliance of a batch of a specific family of machines. In addition, information on the type of
29、sampling to be used (single, double or sequential) and the sample size is required. The procedures specified in this part of IS0 7574 assume that the noise emission values of a batch (lot) of machines will follow a normal distribution. The statistical parameten upon which this part of IS0 7574 is ba
30、sed assume that there is a 95 % probability of acceptance if no more than 6,5 % 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 this part of I
31、S0 7574 ensure that a batch (lot) of machines labelled in accordance with the specifications for the verification procedure have a predetermined probability of acceptance. 1 This part of IS0 7574 provides guidelines for determining the labelled value, L, by the labeller and specifies statistical sam
32、pl- ing procedures for verifying compliance of the noise emissions of a batch (lot) of machinery and equipment with its labelled value. Scope and field of application This part of IS0 7574 is intended to assist those parties respon- sible for drawing up specific labelling codes for specific families
33、 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 clause 7. This part of IS0 7574 does not deal with the consequences tha
34、t ensue if the stated value is not confirmed as verified for a batch (lot) of machines. 2 References IS0 3951, Sampling procedures and charts for inspection by variables for percent defecrive. IS0 4871, Acoustics - Noise labelling of machinery and equip- ment. IS0 7-41 1, Acoustics - Statistical met
35、hods for determining and ver+ing stated noise emission values of machinery and equipment - Part ?I General considerations and definitions. 3 Definitions For the purposes of this part of IS0 7574, the definitions given in IS0 7574/1 apply. 4 General For a batch of machines, the noise emission values
36、will cover a certain range due to the variability between the machines (rel- evant measure: standard deviation of production, a,) and due to measurement errors occurring under reproducibility condi- tions (relevant measure: standard deviation of reproducibility, bR - see 3.17 in IS0 7574/1). The mea
37、sure for the overall variability is the total standard deviation, at- The aim of labelling a batch of machines is to indicate as labelled value, L, a limit below which a specified large propor- Page 4 EN 25 574-4 : 1988 tion of the noise emission values of the batch shall lie. Lc is ex- pressed as a
38、n integer in decibels. When used for checking the compliance of a batch of machines with the labelled value, this part IS0 7574 works on the prin- ciple that only a sample from the batch is measured. This prin- ciple is appropriate for mass-produced machines. This part of IS0 7574 considers the need
39、 to control machines which are too noisy compared with the labelled value; therefore, it applies to one-sided cases for checking an upper limit, not to two-sided cases which would also exclude machines which are too quiet. The principle is based on balancing risks which are expressed by a pair of va
40、lues: a specified proportion, pl -a, of noise emis- sion values of the batch exceeding the labelled value and a specified probability of rejection, a, for a lot with this propor- tion pi - (I Verifying compliance of the lot with the labelled value is based on the following assumptions: a) that the n
41、oise emission values of the batch approximate to a normal distribution, characterized by the mean value p and the specified reference standard deviation uM; and b) that the rejection probability for a batch is equal to a specified value a if the labelled value L, is chosen so that the proportion of
42、noise emission values of the batch ex- ceeding L, is equal to the specified value pl -a. Procedures in this part of IS0 7574 are based on a = 5 % and = 6,5 %. NOTE - The fixed value of 6,5 % was chosen in order - to comply with the definition for L,; - to make sure that the difference between L, and
43、 the mean for the batch is reasonably limited; and - to achieve a common undemanding, comparability and com- patibility of different Lc valuesfw different machines from different families of machines. If the batch and the labelled value, L, conform with these values, the sampling inspection procedur
44、es are set in such a way that the batch will be accepted with the probability of 1 - a = 95 % and the mean value will be expected to lie ap- proximately 1.5 oM below the labelled value. NOTES 1 If it is explicitly known that a stated value is not an upper value as L, but represents a mean value (whi
45、ch is not in accordance with ISO4871). the checking procedure might also be used by adding 1.5 VM to this mean value to obtain L,. 2 Methods for estimating risk factors are given in annexes A and B; they may be replaced by repeated, simulated application of the check- ing procedure using actual meas
46、urement data, if the assumption that the noise emission values of the batch approximate to a normal distribution is uncertain. Normality tests will be described in a future International Standard. 3 The sampling inspection by variables for isolated batches of machines, as described in this part of I
47、S0 7574, broadly conforms to IS0 3951 which is, however, designed for the inspection of batches from continuous production. IS0 3951 does not provide for double and sequential sampling inspection, and the operating characteristic curves do not intersect exactly at the producers risk point; this is,
48、however, the aim of this part of IS0 7574 with the view to establishing the rnean- ing of L, unambiguously. It should be noted that fixing a and pi -a results in all operating characteristic curves (OCs) intersecting at the producers risk point. If the actual total standard deviation is different fr
49、om the reference standard deviation QM, guidance for the labeller is given in clause 5 and annex B. NOTE - In the application of this part of IS0 7574, it is assumed that all measurements will be performed by a testing laboratory which has appropriate test facilities and trained staff. 5 Guidelines for the determination of the labelled value, Lc, by the labeller As the determination of the labelled value for a batch of machines is the sole responsibility of the labeller, this clause is given for guidance o
