This document specifies noise test codes for determining the sound power level and the emission sound pressure level at the workstation of reciprocating internal combustion engine driven electrical power generating sets. This document applies to constant and variable-speed reciprocating internal combustion (RIC) engine driven alternating current (AC) and direct current (DC) generating sets for fixed and mobile applications with rigid or flexible mountings. It is applicable for land and marine use, excluding generating sets used on aircraft or to propel land vehicles and locomotives. NOTE 1 For some specific applications (e.g. essential hospital supplies, high-rise buildings) supplementary requirements can be necessary. The provisions of this document can be regarded as a basis. NOTE 2 This document is referenced with regard to noise in ISO 8528-13:2016, which contains requirements concerning the design of generating sets, verification of noise levels and information related to noise in the operating and maintenance instructions.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Annex ZA (informative)Relationship between this document and the essential requirements of Directive 2006\/42\/EC aimed to be covered <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Blank Page <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4 Symbols <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5 Selection of the most appropriate method 5.1 General <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.2 Sound power level measurements accuracy grades 5.2.1 General 5.2.2 Engineering grade (grade 2) 5.2.3 Survey grade (grade 3) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6 Measuring equipment 6.1 General 6.2 Calibration 7 Measuring environment 7.1 General 7.2 \u200bVerification of acoustic adequacy of test environment 7.3 Criteria for background noise 8 Definition of noise source and operating conditions of the generating set 8.1 Definition of noise source under test <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 8.2 Location, installation of the generating set 8.3 Mounting of the generating set 8.4 Operation of the generating set during test <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 9 Reference box and measurement surface 9.1 Reference box 9.2 Determination of the reference box in special cases 9.2.1 Elevated generating set on a trailer or trolley kit 9.2.2 Generating set with extended exhaust device <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 9.2.3 Generating set with auxiliary equipment 9.3 Measurement surface 9.3.1 General 9.3.2 Microphone orientation <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 9.3.3 Hemispherical measurement surface 9.3.4 Parallelepiped measurement surface 9.3.5 Reduction in the number of microphone positions 10 Measurement of sound pressure levels 11 Determination of the A-weighted sound power level 11.1 Calculation of mean-time-averaged sound pressure levels 11.2 Corrections for background noise 11.3 Calculation of the surface time-averaged sound pressure levels <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 11.4 Calculation of sound power levels 11.5 Calculation of apparent surface sound pressure level non-uniformity index 11.6 A-weighted sound power level 12 Measurement uncertainty 13 Guaranteed sound power level 13.1 General 13.2 Arithmetic mean of sound power levels <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 13.3 Expanded measurement uncertainty 13.4 Coverage factor 13.5 Determination of \u03c3R0 13.6 Determination of \u03c3omc <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 13.7 Determination of \u03c3p 13.8 Calculation of the guaranteed sound power level 14 Test report 15 Determination of the emission sound pressure level at the workstation 15.1 General 15.2 Determination of location of the workstation(s) <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 15.3 Criteria for the adequacy of the test environment 15.4 Corrections for background noise 15.5 Measured quantity 15.6 Calculation of A-weighted emission sound pressure level 15.7 Normalizing to reference meteorological conditions <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 15.8 Quantities to be determined 15.9 Operation of the generating set 15.10 Microphone positions 15.10.1 General <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 15.10.2 Microphone position for a standing operator 15.10.3 Microphone position for a bending, crouching or kneeling operator 15.10.4 Microphone positions if there is no clearly identifiable operator position or for machines without operator 15.11 Measurement uncertainty 15.12 Test report <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Annex A (normative) Application of ISO 3744:2010 for generating sets <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Annex B (normative) Application of ISO 3746:2010 for generating sets <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Annex C (informative) Sound intensity methods <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Reciprocating internal combustion engine driven alternating current generating sets – Measurement of airborne noise<\/b><\/p>\n |