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Vehicle noise behavior - French concept

Informal document No . GRB-44-3 (44th GRB, 4-6 September 2006 agenda i tem 1.2.1.3.). Vehicle noise behavior - French concept. Model : L tyre = L_tyre (v ref)+ a*log (v/v ref) L engine expecting = L engine (N ref) + b (N – N ref)

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Vehicle noise behavior - French concept

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  1. Informal document No. GRB-44-3 (44th GRB, 4-6 September 2006 agenda item 1.2.1.3.) Vehicle noise behavior - French concept Model : L tyre = L_tyre (v ref)+ a*log (v/v ref) L engine expecting = L engine (N ref) + b (N – N ref) L vehicle (N, v) = L engine expecting (N) « + » L tyre (v) L limit = L vehicle (N, v) +2 dB • Critique : • Compliquée • Bruit pneumatique incomplet (effet couple) • Robuste Vehicle noise limit (N ; v) 2 dB L wot simulated Vehicle noise simulated (N ; v) L wot measured Vehicle noise measured (N ; v) (N_i ; v_i) L wot i L tyre (v) ≥ 3 dB Homologation point from Annex 3 Vehicle speed ASEP Measurements

  2. Vehicle noise behavior French concept: Construction of the model Vehicle noise Measurements L wot i (N ref, v ref) L wot i homologation point from Annex 3 Tyre noise measurements Vehicle speed V ref Measurements Tyre noise model : L tyre = L_tyre (v ref)+ a*log (v/v ref) a et L tyre (v ref) Régression logarithmique Measurements L engine (N ref) = L wot i (Nref) « - » L tyre ( v ref) L engine (N ref)

  3. Vehicle noise behavior French concept: Model Application for (N, v) Model : L tyre = L_tyre (v ref)+ a*log (v/v ref) Tyre noise L tyre (v) L tyre (v) Tyre noise measurements Tyre noise calculation at v V Vehicle speed Model : L engine expecting = L engine (N ref) + b (N – N ref) Engine noise L engine expecting (N) Slope 5 or 6 dB / 1000 L engine expecting (N) Engine noise expecting at N L engine (N ref) N Engine speed Model : L vehicle (N, v) = L engine expecting (N) « + » L tyre (v)

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