Development of procedures for certifying noise testing equipment Bolków

Task 2.3 of Silvia project is dedicated to development ofcertification procedures required in order to ascertain high quality ofthe results obtained during measurements that are necessary to fulfilgoals of the SILVIA project. Most of the certification proceduresdescribed in this report are related to the Close Proximity (CPX)instruments, most notably the test vehicles. This report covers firstfindings in this respect. Activities within the Task 2.3 are not finished yet and it isanticipated that the procedures will still be refined and evenseriously modified if necessary. The report is based on the bestexisting expertise, but the authors are aware that some additionalresearch is still needed. Most notably the data on representativity andreproducibility ("statistical information") is not available yet andwill be collected during appliance of the procedures in the "real live"situations. The purpose of the report is to summarise existing knowledge onthe subject and provide tools for equipment users and manufacturers tofulfil quality assurance requirements. The proposed procedures are not,in general, intended to become standards. The report contains alsoinformation about selected measurements that were performed toestablish and validate the certification procedures. Spis treści: 1. INTRODUCTOREY NOTE 2. PROCEDURES FOR CPX EQUIPMENT 2.1. General overview of the Close Proximity Method (CPX) 2.2. Background noise 2.2.1. Overview 2.2.2. Hub assembly noise 2.2.3. Supporting wheels 2.2.4. Towing car noise 2.2.5. Passing and overtaking vehicles 2.3. Reflections 2.4. Speed measuring equipment 2.5. Microphone position 3. PROCEDURES FOR SPB EQUIPMENT 4. PROCEDURES FOR SOUND ABSORPTION EQUIPMENT 4.1. Choice of an appropriate reference surface for certification measurements 4.2. Certification Stage 1: The mounting frame connecting the loudspeaker and microphone 4.3. Certification Stage 2: The main loudspeaker/microphone system support structure 4.4. Reporting of results 5. PROCEDURES FOR TEXTURE MEASURING EQUIPMENT 5.1. Background information 5.2. Procedure for checking compliance with equipment requirements 5.3. Procedure for calibration of equipment in connection with measurements 6. SHORT DESCRIPTION OF TYPICAL INSTRUMENTS 6.1. CPX 6.1.1. The "ROEMER" 6.1.1.1. Description of the ROEMER 6.1.1.2. Possible applications for the ROEMER 6.1.2. The M+P trailer 6.1.2.1. General 6.1.2.2. Measurement system 6.1.2.3. Technical data 6.1.3. Tiresonic Mk 1 , Mk 2 and Mk 3 6.1.3.1. General 6.1.3.2. Measuring system 6.1.4. TRITON 6.1.5. LPC Test Vehicle 6.2. SPB 6.3. Absorption 6.3.1. MIRIAD (TRL mobile absorption measurement system) 6.3.2. LPC Static system 6.4. Texture 6.4.1. TRL HARRIS Survey Vehicle 7. RESULTS OF EXPERIMENTS PERFORMED TO ESTABLISH CPX VEHICLES CERTIFICATION PROCEDURES 7.1. General 7.2. Stationary measurements in Gdansk 7.2.1. Hub assembly noise 7.2.2. Supporting wheels 7.2.3. Towing car noise 7.2.4. Passing and overtaking vehicles 7.2.5. Reflections 7.3. Stationary measurements in BASt (2004) 7.3.1. Artificial noise source 7.3.2. Measurements 7.3.3. Results - "ROEMER" - DWW 7.3.4. Results - M+P CPX-trailer 7.3.5. Repeatability and reproducibility 7.3.5.1. Repeatability- M+P Noise Source 7.3.5.2. Reproducibility - M+P Noise Source 7.3.5.3. Reproducibility-TUG's Artificial Noise Source 8. CONCLUSIONS 9. ANNEX - Certification during Round Robin Test 9.1. General 9.2. Results of certification for PCX vehicles 9.2.1. DWW Trailer 9.2.2. TRL vehicle 9.2.3. M+P 9.2.4. Tiresonic Mk 3 9.2.5. French car 9.3. Conclusions REFERENCES SUPLEMENT TO CPX VEHICLES CERTIFICATION PROCEDURES