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| Document Title | UN R51: Proposal for a Supplement 9 to the 03 series of amendments | ||||||||
| Reference Number | GRBP-77-09 | ||||||||
| Date |
1 Feb 2023
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| Summary | Proposal from the Informal Working Group on Measurement Uncertainties (IWG MU) to amend UN R51 with tables showing the measurement uncertainties when performing type-approval, COP, or field testing (e.g. market surveillance). The measurement uncertainties developed in this Appendix are based the IWG MU work and its Document for Reference which describes a general approach to estimate measurement uncertainties (GRBP/2022/9/Rev.2). The impact of the quantities on the expanded uncertainty has been evaluated separately for run-to-run, day-to-day, vehicle-to-vehicle and site-to-site variations. Some of the different impacts are based on calculations from tolerances in Annex 3, while others are based on experiences. | ||||||||
| Rulemaking Area(s) | UN R51 Vehicle Noise | ||||||||
| Proposal Status | Informal GR review | ||||||||
| Meeting(s) | |||||||||
| Related Documents | |||||||||
| GRBP-77-07 | A general approach how to handle noise measurement uncertainty | ||||||||
| GRBP-77-08 | Proposal for a Revision 2 to the general approach how to handle noise measurement uncertainty | ||||||||
| GRBP/2022/9/Rev.1 | A general approach how to handle sound measurement uncertainty (superseded) | ||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | .docx format | |||||||
| Excerpts from session reports related to this document | |||||||||
| GRBP | Session 77 | 7-10 Feb 2023 |
6. The Chair of IWG MU reported on their activities (GRBP-77-10-Rev.1) and presented amendments to the document of reference on measurement uncertainties (GRBP-77-07 and GRBP-77-08). GRBP adopted the amendments and requested the secretariat to publish the revised document of reference on the GRBP website. 7. The expert from IWG MU introduced a proposal that aimed to amend UN Regulation No. 51 with tables showing the measurement uncertainties when performing type approval, conformity of production (COP) or field testing (e.g. market surveillance) (GRBP-77-09). Some GRBP experts suggested that these tables be included not in the UN Regulation, but in another document, for example, the above document of reference. Following an exchange of views, GRBP decided to revert to this issue at the next session. |
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