Browse Publications Technical Papers 2019-01-1587
2019-06-05

Identification of Transfer Path Analysis of Rumbling Noise in a Passenger Car Based on In-Situ Blocked Force Measurement 2019-01-1587

The control of rumbling noise is one of major targets in control strategies of interior sound quality inside of cabin in a passenger car. For the control of the rumbling noise in a passenger car, at the first, the transfer path of the rumbling noise is should be identified. It had been known that the major source of the rambling noise is due to the combustion force of an engine. The combustion force excites the engine and induces the vibration of the powertrain. The vibration of the powertrain is transferred to the car body throughout the structural transfer path of a car. The vibration of the car body emits the vibra-acoustic noise inside of a car. It has been called the rumbling noise due to structural borne. If there are the structural resonances among the structural paths such as engine, transmission, mount bracket, suspension, and car body, the rumbling noise would be amplified. For the identification of the major resonances on the structural transfer path, the classical transfer path analysis (CTPA) had been used for long time. The method has a deadlock to require a decoupling of the substructures in order to obtain the contact force between components and to identify the transfer path of the structure borne sound. Recently the blocked force transfer path analysis (BF-TPA) is introduced and it does not require the decoupling of the substructures. This paper identifies the structure borne path for rumbling sound based on the blocked force transfer path analysis (BF-TPA) in a passenger car. In addition to identification, the passive control method of the rumbling sound are presented.

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