Evaluation of the acoustical performance and behaviour of a hybrid truck in urban use

Marie-Agnès Pallas (1, 2) , Roger Chatagnon (1, 2) , Joël Lelong (1, 2)

1 IFSTTAR/LTE - Laboratoire Transport et Environnement
2 CeLyA - centre Lyonnais d'Acoustique

Noise emission of mid-sized trucks operating in urban areas for goods delivery and services (for instance waste collect) is crucial, mainly during night and early morning periods. The development of hybrid vehicles is particularly appropriate to urban use since, besides improvements towards energy consumption and pollutant emission, it may also lead to noise reduction, mainly due to the presence of the electric motor. The French research project GEODE (project leader Renault Trucks) gathered several partners for the development of a mid-sized hybrid truck with optimized energy control. One work package consisted in the evaluation of the environmental performance of the vehicle, as compared to an equivalent conventional engine truck. The present paper presents the acoustical part, based on measurements of the acoustic emission under real use conditions: constant speed, acceleration and braking. It includes standard pass-by 7.5 meter noise levels as well as main source analysis, the latter resulting from near-field microphone array measurements, for each vehicle configuration (reference engine truck, hybrid truck under hybrid use, hybrid truck under electrical use). Noise emission laws of the vehicles and of their main noise sources are determined. The electrical mode introduces an undeniable gain at urban speeds, the residual noise resulting mainly from the drive wheel rolling noise.

Mots clés: hybrid truck noise; noise source; motor noise; rolling noise

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Marie-Agnès Pallas, Roger Chatagnon, Joël Lelong. Evaluation of the acoustical performance and behaviour of a hybrid truck in urban use. Acoustics 2012, Apr 2012, Nantes, France. pp.1661-1666. ⟨hal-00810678⟩