Professional vehicle noise measurement for regulatory pass-by noise testing, interior noise characterization, and automotive acoustic development. Vehicle noise measurement supports type approval compliance (ISO 362, UN ECE Regulation 51), interior noise quality assessment, and product development programs aimed at reducing noise to improve driver and passenger comfort and meet increasingly stringent noise regulations. Bedrock Elite Class 1 instruments with 1/3 octave band analysis and data logging provide the measurement capability required for these applications.
Vehicle noise regulations are becoming increasingly stringent worldwide. UN ECE Regulation 51 (R51.03) limits exterior pass-by noise from passenger cars and light commercial vehicles, with progressively tighter limits scheduled for implementation. The automotive industry uses precise acoustic measurement not only for regulatory compliance but also as a product quality parameter — "sound quality" has become a significant differentiator in vehicle development, driving demand for detailed frequency analysis of interior noise.
The i10's GPS position tagging capability allows noise levels to be georeferenced, enabling the creation of noise maps that show how vehicle noise varies with location along a road corridor. This capability is particularly useful for traffic noise impact assessments, noise barrier design studies, and road surface influence investigations.
A standard ISO 362 pass-by noise measurement requires a flat test track with a specified surface texture and low background noise level. The microphone is positioned 7.5 m from the centre of the vehicle path at a height of 1.2 m. The vehicle accelerates from a defined approach speed through the measurement zone, and the maximum A-weighted sound pressure level during the pass-by is recorded. Multiple passes (at least four valid passes required per test condition per ISO 362-1) are made in each gear and speed combination. The A-weighted maximum sound pressure level (LpAmax) for each pass is recorded by the Class 1 sound level meter, and the results are averaged logarithmically to obtain the reported pass-by noise level. Background noise must be at least 10 dB below the vehicle noise level for the measurements to be valid. The Bedrock Elite i10's data logging and fast time-constant capability provides the required measurement accuracy and temporal resolution for ISO 362 pass-by testing.
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