Influence of noise and vibration to comfort in diesel engine cars running at idle
Résumé
a bench has been designed and built : it allows that a subject can be placed on a car seat excited in the vertical direction; the subject also has his hand on a vibrating steering wheel and can hear noises through headphones. Thus a realistic simulation of the environment of the driver of an engine car running at idle is possible. After measurements on six cars, three paired comparison tests have been conducted : - in the first one, the test person is only exposed to noise; - in the second one, he/she is also exposed to vibrations measured in the cars, but he/she is always asked to evaluate only sounds; - in the third one, he/she is then asked to evaluate the overall annoyance of the situations while being exposed to all stimuli. The comparison between the results of the first two tests proves that vibrations have an influence on sound perception in a small but significant way. In the third test, the jury can be separated in two groups of people using different criteria : for the first one, the overall annoyance is only related to the vibratory stimuli, whereas in the second one, noise stimuli are also important for the evaluation.
Origine : Fichiers produits par l'(les) auteur(s)
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