Variability of automotive interior noise from engine sources
Variability of automotive interior noise from engine sources
A statistical analysis of a series of interior vehicle noise measurements on a set of 1106 automotive vehicles, both petrol and diesel versions, from one manufacturer is presented: a small hatchback model and a mid-sized family 5-door car. The engines were run at 50 rpm intervals over therange from 1000 rpm up to 4000 and 5950 rpm for the diesel and petrol variants respectively, with full load in second gear whilst the vehicle was on a dynamometer roller test rig, comprising a smooth rolling surface.The measured interior noise at four positions corresponding to passenger ear locations were subsequently analysed in third octave bands as well as the overall levels, with statistical tests being performed on the linear rms pressures. The normalised standard deviation of the linear data decreases with increasing frequency. It is typically less than 0.1 over the whole audio frequency range irrespective of vehicle type or engine. A lognormal distribution provides the best fit to the majority of the engine noise results and the overall engine noise could be described by a lognormal or gamma distribution. A lognormal distribution fit implies that the values in dB are normally distributed.
109-125
Hills, Esther
9e030922-1535-4a5f-880e-9eb03956798d
Ferguson, N.S.
8cb67e30-48e2-491c-9390-d444fa786ac8
Mace, B.R.
cfb883c3-2211-4f3a-b7f3-d5beb9baaefe
March 2011
Hills, Esther
9e030922-1535-4a5f-880e-9eb03956798d
Ferguson, N.S.
8cb67e30-48e2-491c-9390-d444fa786ac8
Mace, B.R.
cfb883c3-2211-4f3a-b7f3-d5beb9baaefe
Hills, Esther, Ferguson, N.S. and Mace, B.R.
(2011)
Variability of automotive interior noise from engine sources.
Noise Control Engineering Journal, 59 (2), .
Abstract
A statistical analysis of a series of interior vehicle noise measurements on a set of 1106 automotive vehicles, both petrol and diesel versions, from one manufacturer is presented: a small hatchback model and a mid-sized family 5-door car. The engines were run at 50 rpm intervals over therange from 1000 rpm up to 4000 and 5950 rpm for the diesel and petrol variants respectively, with full load in second gear whilst the vehicle was on a dynamometer roller test rig, comprising a smooth rolling surface.The measured interior noise at four positions corresponding to passenger ear locations were subsequently analysed in third octave bands as well as the overall levels, with statistical tests being performed on the linear rms pressures. The normalised standard deviation of the linear data decreases with increasing frequency. It is typically less than 0.1 over the whole audio frequency range irrespective of vehicle type or engine. A lognormal distribution provides the best fit to the majority of the engine noise results and the overall engine noise could be described by a lognormal or gamma distribution. A lognormal distribution fit implies that the values in dB are normally distributed.
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Published date: March 2011
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Local EPrints ID: 185395
URI: http://eprints.soton.ac.uk/id/eprint/185395
ISSN: 0736-2501
PURE UUID: 0a50ceda-0bb8-48f5-ad25-1e3a820f7c89
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Date deposited: 10 May 2011 13:04
Last modified: 10 Jan 2023 02:32
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Author:
Esther Hills
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