Assessment of vehicle noise variability through structural transfer path analysis Online publication date: Fri, 02-Sep-2016
by Akın Oktav; Günay Anlaş; Çetin Yılmaz
International Journal of Vehicle Design (IJVD), Vol. 71, No. 1/2/3/4, 2016
Abstract: In this work, vehicle noise variability and dominant paths that cause low frequency booms are investigated. Five identically produced vehicles are subjected to road tests to acquire engine and exhaust mounts' acceleration and cabin sound pressure level (SPL) data. When the acquired data are processed, significant variability is observed among SPLs of vehicles. Low frequency booms are also diagnosed and two of the tested vehicles are selected to be further analysed. Structural transfer path analysis (TPA) is carried out, in which several parameters such as test conditions and frequency response function estimation procedures are highlighted. Dominant paths that contribute to booms are identified. To diagnose the cause of variability, a systematic approach is proposed, where all steps consist of experimental studies only. Finally, it is deduced that predominant paths, which are found to be main contributors of diagnosed booms, are also the root causes of variability observed.
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