Investigation into road rumble in a light utility vehicle

[摘要] Vehicle Noise, Vibration and Harshness (NVH) is now a more importantcomponent of the vehicle design process than ever. Road noise is one of thekey criteria used by potential buyers (albeit subconsciously) to choose whatthey perceive as the best vehicle.Road rumble is a key concern for vehicle manufacturers. Light UtilityVehicles (LUVs) are especially sensitive to a low frequency booming noisedue to the fundamental acoustic mode that exists in the vehicle cabin. Aninvestigation into this booming noise in an LUV is documented. The noiseis identified and quantified after which the source of the noise in the vehiclecabin is identified using NVH techniques such as Acoustic Modal Analysis(AMA), Experimental Modal Analysis (EMA) and Transfer Path Analysis(TPA). The cabin's fundamental acoustic mode lay at 100 Hz. Finally thesource of the vibrations in the vehicle leading to the booming noise in thecabin is identified, along with its transfer path to the cabin.Solutions for the specific vehicle's booming noise are proposed, two ofwhich are tested with some success. Solutions to the problems associatedwith the fundamental acoustic mode of LUVs are also proposed and discussed.

[发布机构] Stellenbosch University