Combining Vehicle and Test-Bed Diagnosis Information to Guide Vehicle Development for Pass-By Noise

Fleszar, A. R.; Linden, P. J. G. van der; Johnson, Jim; Grimmer, Michael

doi:10.4271/2001-01-1565

Cited by 13 publications

(13 citation statements)

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“…In the reciprocal approach only one sound source is required, while many noise sources are needed in the direct approach, or the measurement has to be repeated for every noise source patch with a single loudspeaker. Averaging of the transfer function is recommended [51,56]. A comparison of directly and indirectly determined transfer functions shows a difference of only ±1 dB [49] confirming the applicability of the principle of reciprocity.…”

Section: Quantification Of Transfer Path Characteristicsmentioning

confidence: 99%

“…For the evaluation of a powertrain noise source, a good correlation between the test rig and the full vehicle measurements has been presented in Ref. [51]. In Ref.…”

Section: Quantification Of Noise Source Strengthsmentioning

confidence: 99%

“…In the time domain, the operational source strengths are convolved with the corresponding impulse response functions, in order to obtain the noise source contributions [57]. In the frequency domain, the source contributions are calculated at a discrete track position by the product of the operational source strengths and the corresponding transfer functions [51]. The overall sound pressure level of the summed source contributions spectra yields the overall pass-by noise level at that particular position.…”

Section: Evaluation Of the Pass-by Noise Predictionmentioning

confidence: 99%

“…The number of patches and microphones varies significantly. For example, equally sized areas of 0.1 m 2 [47] and 0.04 m 2 [51] up to an area the size of an engine side [12,55] are reported. However, subdivisions of the engine into the different sides of the engine block and oil pan, accessories and gearbox are also practiced [57].…”

Section: Quantification Of Noise Source Strengthsmentioning

confidence: 99%

“…Whether measurements are conducted indoors or outdoors, the asphalt surface should comply with the requirements of the ISO 10844 standard to ensure that comparable conditions regarding the actual pass-by noise test are applied [54]. In order to provide a realistic image of the transfer function behaviour in the pass-by noise test situation, it is recommended to equip the vehicle prototype with the insulation material which is planned to be used in the end product [51]. If the acoustic boundary conditions alter, for example, if acoustic insulation is added to the vehicle, then the transfer function has to be determined for the altered configuration [53].…”

Section: Quantification Of Transfer Path Characteristicsmentioning

confidence: 99%

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Noise source characteristics in the ISO 362 vehicle pass-by noise test: Literature review

et al. 2013

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A B S T R A C TSince many people are exposed to road traffic noise in urban areas, current legislation aims to limit vehicle noise emissions. In Europe, the vehicle pass-by noise test is implemented according to the international standard ISO 362. As a result of more recent investigations of urban traffic, a revision to the ISO 362 standard has been proposed that includes a constantspeed test in addition to the traditional accelerated test in order to determine the pass-by noise value. To ensure compliance with the pass-by noise test vehicle manufacturers and suppliers must quantify vehicle noise source characteristics during the design stage of the vehicle. In addition, predictive tools need to be available during the product development phase in order to estimate the final pass-by noise level. In this paper an extensive literature survey is presented of noise source characteristics in the ISO 362 vehicle pass-by noise test. Vehicle pass-by noise is analysed in the time and frequency domains and a ranking of the noise source contributions is established. The characteristics of the four major noise sources (engine, intake system, exhaust system, tyre/road system) contributing to pass-by noise as well as current prediction methods are reviewed.

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Section: Quantification Of Transfer Path Characteristicsmentioning

confidence: 99%

“…For the evaluation of a powertrain noise source, a good correlation between the test rig and the full vehicle measurements has been presented in Ref. [51]. In Ref.…”

Section: Quantification Of Noise Source Strengthsmentioning

confidence: 99%