1、Canadian Standards Assoc iat ion CSA Standard Recommended 2107.52-MI983 Practice for the (Reaffirmed 2 004) Predict ion of Sound Pressure Levels in Large Rooms Containing Sound Sources I SS N 03 1 7-5669 Published, February 1983 by the Canadian Standards Association (Incorporated 1919) 178 Rexdale B
2、oulevard Rexdale, Ontario, Canada M9W 1 R3 GENERAL INSTRUCTION (Please read carefully) CSA Standard Zl07.52-M1983, Recommended Practice for the Prediction of Sound Pressure Levels in Large Rooms Containing Sound Sources, consists of 22 pages, each dated February, 1983. This Standard, like all CSA St
3、andards, is subject to periodical review, and amendments in the form of replacement pages may be issued from time to time; such pages will be mailed automatically to those purchasers who complete and return the attached card.* *This card w22E appear with Genera2 Instruction No. 1 onZy. Nde: A Genera
4、l Instruction sheet wiZZ accompany repzacernent pages each time they me issued and wfll list the latest date of each page of the Standard. Although any replacement pages that have been issued will be sold with the Standard, it is for the purchaser to insert them where they apply. The responsibility
5、for ensuring that his or her copy is complete rests with the holder of the Standard, who should, for the sake of reference, retain those pages which have been replaced. General Instruction No. 1 February, 1983 ZlO 7.52-M 198 3 Name Organization CSA STANDARD 2107.52-Ml983 Address C ity ProvJState Cou
6、ntry Postal/Zip Code t , 1 Aff ranchir suffisamment Place Stamp Here CSA INTERNATIONAL BUREAU CENTRAL DE LINFORMATION 178 BOUL REXDALE TORONTO ON M9W 1 R3 CANADA CSA INTERNATIONAL CONSOLIDATED MAILING LIST 178 REXDALE BLVD TORONTO ON M9W 1 R3 CANADA 0 Canadian Standards Association-1983 All righk re
7、served. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior permission of the publisher. Recommended Practice for the Prediction of Sound Pressure Levels in Large Rooms Containing Sound Sources 3 Contents Page 4 6 Preface Techn
8、ical Committee on Acoustics and Noise Control 7 7 standard 1. scope 2. Definition 3. Procedure 3.1 Map Preparation 3.2 Sources Sound Levels (Li) 3.3 Determination of Room Correction Curves ( AL) 3.4 Determination of Sound Level Contours 3.4.1 Grid Points 3.4.2 Determination of TotaE Sound Pressure L
9、evel IL I at Each Grid Point 3.4.3 Sound Level Contours P 9 4. Report 10 Tables 11 Figures 12 Appendix A-Example of Sound Pressure Prediction February, 1983 4 CSA Standard Z107.52-Ml983 Technical Committee on Acoustics and Noise Control T.P.W. Embleton (Chuirrnan) National Research Council of Canada
10、, Ottawa, Ontario C. Andrew (Associate) The City of Calgary, Alberta D.A. BenweU Health and Welfare Canada, Ottawa, Ontario L-D. Bergsten Caterpillar Tractor Co., Peoria, Illinois, U.S.A. A.J. Brammer (Alternate) National Research Council of Canada, Ottawa, Ontario B. Brownlee (Associate) Leq Measur
11、ements Limited, Brampton, Ontario E.B. Clark Workers Compensation Board of British Columbia, Richmond J.E. Coulter Barman, Coulter, Swallow Associates, Rexdale, Ontario W.M. Crawford (Alternate) Workers Compensation Board of British Columbia, Richmond A.T. Edwards (Associate) Ontario Hydro, Toronto
12、G. Paulkner (Associate) University of Alberta, Edmonton S.E. Porshaw (Associate) Department of National Defence, Downsview, Ontario M.J. Frost Canadian Pulp and Paper Association, Montreal, Quebec J.R. Hemimay Decoust ics Limited, Rexdale, Ontario T. Howarth Industrial Accident Prevention Associatio
13、n, Toronto, Ontario R.B. Johnston Elec tro-M edical Instrument Co., Oakville, Ontario H.W. Jones (AZternate) Dalhousie University, Halifax, Nova Scotia L.G. Kende (Alternate) Ontario Ministry of the Environment, Tor onto P. Koziol (Associate) The Mines Accident Prevention Association Ontario, North
14、Bay A,D. Lightstone Valcoustics Canada Ltd., W ill0 w dale , Ontario J.P.W. MacKay Department of Labour and Manpower, Winnipeg, Manitoba J, Manuel (Liaison) Ontario Ministry of the Environment, Toronto D. McVittie Construction Safety Association of Ontario, Toronto T.D. Northwood National Research C
15、ouncil of Canada, Ottawa, Ontario E.O. Nyborg Industrial Technology Centre, Winnipeg, Manitoba G. Perreault Commission de la Santk et de la Sgcuritk dv Travail, Trois-Rivieres, Quhbec G,S. Perry Bruel and Kjaer Canada Ltd., Pointe Claire, Quebec February, 1983 Reconanended Practice for the Predictio
16、n of Sound Pressure Levels in Large Rooms Containing Sound Sources 5 A. whin Labour Canada, Ottawa, Ontario J-D. Quirt (AZternate) National Research Council of Canada, Ottawa, Ontario Z.P. Reif University of Windsor, Ontario L.T. Russell Nova Scotia Technical College, Halifax M.J. Savich (Associate)
17、 Canada Centre for Mineral and Energy Technology, Elliot Lake, Ontario C. Seccombe Consumers Association of Canada, Ottawa, Ontario C.W. Sherry Dom t ar Construction Materials, Montreal, Quebec P.E. Toole (Alternate) National Research Council of Canada, Ottawa, Ontario E.R. Wehurne Transport Canada,
18、 Ottawa, Ontario D.L.M. Williams (AEternate) Queens University, Kingston , Ontario K. Wilson Fiberglas Canada Inc., Toronto, Ontario J.J. Wojcik (Associate) Aprel Industrial Acoustics, Nepean, Ontario L.G. Bortolin (Standards Administrator , Non-vot ing) Canadian Standards Association, Rexdale, Onta
19、rio The following members of the Subcommittee on Industry Noise made valuable contribution to the development of the Standard: C.W- Sherry (Chairman) Domtar Construction Materials, Montreal, Quebec W. Atkinson General Motors, Windsor, Ontario A. Behar Ontario Hydro, Pickering C.W. Bradley William Br
20、adley and Associates, Montreal, Que be c T.P.W. Embleton National Research Council of Canada, Ottawa, Ontario H.W. Jones Dalhousie University, Halifax, Nova Scotia T. Kelsall Hatch Associates Ltd., Toronto, Ontario D. Lambert Kirkland, Quebec A.L. McAnuff VME Associates Ltd., Rexdale, Ontario G-E, M
21、enzies Stelco Inc., Hamilton, Ontario P, Mundie Montreal, Quebec M.M. Osrnan Ontario Hydro, Toronto L.T. Russell Nova Scotia Technical College, Halifax B.V- Seshagiri Ontario Ministry of Labour, Ottawa February, 1983 6 CSA Standard 2107.52-M1983 Preface This is the first edition of CSA Standard 2107
22、.52, Recommended Practice for the Prediction of Sound Pressure Levels in Large Rooms Containing Sound Sources, forming part of the CSA 2107 Series of Standards on Acoustics and Noise Control. This Standard was prepared as a result of requests made and interest shown by industry, acoustical consultan
23、ts, and others. It represents a cross-section of thinking and practices of experts in acoustics who have made predictions of sound levels in industry. At the time this Standard was being prepared, there were no known published standards on this subject. This Standard is intended to fulfill the need
24、for a practice to evaluate how the noise levels in a space are affected by the addition of another noise source, the removal of a noise source, the modification of a noise, or a spatial redistribution of noise sources. Without such a practice it would be impossible to decide how best to reduce the n
25、oise levels of a space if necessary, or to decide if the addition of a noise source would be sufficient to exceed some pre-established maximum noise level. The contour map developed by this recommended practice may be used to identify “quiet“ locations in the workplace area, or to program the worklo
26、ad of employees so that a worker is not exposed to an excessive noise dose. This Standard was prepared with the Subcommittee on Noise from Industry by the Technical Committee on Acoustics and Noise Control, and was formally approved by this Committee and the Standards Steering Committee on Miscellan
27、eous Subejcts. Rexdale, February, 1983 Note: Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibiZity of the user of the Standard to judge its suitability for his or her particular purpose. CSA Standards are subject
28、 to periodical. review and suggestions for their improvement will be referred to the uppr opr ia t e c om m it t ee. AZZ enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, Standards Division, 178 RexdaZe Boulevard, RexdaEe
29、 (Toronto), Ontario M9W 1R3. Requests for interpretation should: fa) Define the problem, making reference to a specific Clause, and, where appropriate, include an iZ2ustrative ske t c h ; (b) Provide an explanation of circumstances surrounding the actud field condition; and IC) Be phrased, where pos
30、sible, to permit a specific “yes“ or “noff answer. Interpretations are pubZished in “CSA Information Update“. For subscription details and a free sample copy, write to CSA Information Centre or teZephone (416) 744-4058. February, 1983 7 Z 107.52-NI 198 3 Recommended Practice for the Prediction of So
31、und Pressm Levels in Large Rooms Containing Sound Sources 1. scope 1.1 This Recommended Practice describes a procedure for the prediction of sound pressure levels in a large room containing a number of sound sources. This procedure may be used to compute A-weighted, octave, or fractional octave band
32、 sound pressure levels over continuous contours, or at specific points, to predict: (a) Sound pressure levels at the design stage; (5) The effect of altering or moving equipment in an existing space; and (e) The effect of changing the acoustical environrn ent. 1.2 The use of the procedure described
33、in this Recommended Practice requires that the sound emitted from each source (preferably measured in accordance with CSA Standard 2107.51, Procedure for In-Situ Measurement of Noise From Industrial Equipment) be known. When this procedure is used to predict the effect of installing or removing one
34、or more machines, it is sufficient to know the sound pressure levels in the existing space, as well as the sound power levels of each machine. 1.3 This Recommended Practice applies to rectan- gular rooms with a relatively constant height. The length and width of the room should each be greater than
35、about 4 times the height. Where the room geometry departs materially from the simple rectangular shape, the prediction given by this procedure may be incorrect. 1.4 This Recommended Practice can be used with the knowledge of the length of time spent by workers at various locations to estimate their
36、sound exposure. 1.5 This Recommended Practice does not apply to: (a) The prediction of the sound pressure levels resulting from the introduction of large sources, objectives, or barriers at distances less than four times their largest dimension; (c) The prediction of sound highly directive noise sou
37、rce is (d) The prediction of sound noise source has a predominate 1.6 Reference Publication. pressure levels if 3 added; and pressure levels if a pure tone. This Recommended Practice refers to the following Publieation and where such reference is made it shall be to the edition listed below, inchdin
38、g all amendments published thereto: CSA Standard Procedure for In-Situ Measurernent of Noise From Industrial Equipment. Z107.51-M 1980 , 2. Definition 2.1 The following definition applies in this Reco m m ended P r BC t i c e: Map means a floor plan drawn to scale on which is superimposed a rectangu
39、lar grid with the location of each source clearly identiPied. Additional views showing wall and ceiling details may be included along with their sound absorption categories. (b) The prediction of impulse sound levels; February, 1983 8 CSA Standard 2107.52-MI983 3. PFocedure 3.1 Map Preparation 3.1.1
40、 The map should be drawn to a convenient scale. The location of each major sound source together with its sound pressure level should be recorded on the map. The absorption properties of all surfaces should be identified by using the cate- gories of Table 1. 3.1.2 A grid of 3 m intervals should be u
41、sed for building spaces having an average ceiling height of not more than 6 rn. Where average ceiling heights are greater than 6 m, a grid interval of approxi- mately half the height of the ceiling should be used. 3.2 Source Sound Levels (Li). The sound pressure levels may be obtained from manufactu
42、rers specifl- cations or measured in accordance with CSA Standard 2107.51, Procedure for In-Situ Measurement of Noise From Industrial Equipment, or by an equivalent standard. If the cats available are expressed in power levels e.g., 10 12W, they should be converted to sound pressure levels at 1 m fr
43、om the source by subtracting 10.3 dB from each value. 3.3 Determination of Boom Correction Curves ( AL) 3.3.1 The room correction is composed of three elements: the reduction of sound pressure level with increasing horizontal distance, the correction for ceiling reflections, and the correction for w
44、all reflections. 3.3.2 These quantities may be calculated in sequence as follows: (a) Correction for horizontal distance (A LD): The reduction of sound pressure level with increasing horizontal distance neglecting ceiling and wall reflections as shown in Figure 1; (b) Correction for ceiling reflecti
45、on ( ALc): At horizontal distances from a source in excess of the ceiling height, the sound pressure levels will be increased by reflections from the ceiling. In order to take this into account, the idealized curve of Figure 1 should be adjusted upward using the values given in Table 2; Note: Refere
46、nce may be made to ffSomd Radith from a Series of Incoherent Noise Sources in Q Rectangular Array“ by Ernbleton and Dagg, Sound, Vol. I, No. 1, 1962. (c) The correction to sound pressure levels versus distance from the sound source will vary with the direction from the source and will depend on the
47、proximity of the wall to the source and the wall reflection coefficient. Hence, separate curves may be necessary for each source and for each wall. Starting with the curve of sound level versus hori- zontal distance resulting from the procedure of Item (b), for a given source and a given wall the so
48、und level correction given in Table 3 should be added to this curve at the point representing the shortest horizontal. distance from the source to the wall. Through this point a horizontal line should be drawn to meet the corrected curve of Item (b) on the left and outward to the right. Correction f
49、or wall reflections ( AL): 3.3.3 The resulting curve now represents the room correction ( I,). AL = ALD + ALW where ALD = correction for horizontal distance bLC = correction for ceiling reflections ALW = correction for wall reflections 3.4 Determination of Sound Level Contours 3.4.1 Grid Points 3.4.1.1 For each source in turn, the distance from that source to each grid point should be determined. The sound pressure level (L ) due to source i at any given grid point is equal to Li + AL where AL is the Gi correction appropriate for this grid point. 3.4.1-2 Where the grid point being con
