Diagnostics of Noise and Vibration Issue in Large Chassis Dynamometer Installation

Industry: Off-Highway

Applications: Troubleshooting

A large vehicle chassis dynamometer exhibited excessive background noise in the 200 and 250 Hz band. Sound Answers performed operating and artificial excitation testing and established that the noise was structure-borne and due to a bending and a torsional model of the reaction mass of the dynamometer motor, coupled to a bending mode of the motor driveshaft. The animation of the modes at these two frequencies was confirmed from both modal testing and from Operating Deflection Shapes extracted from operating data. Tuned Mass Dampers were designed and successfully installed to solve the problem.

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