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Structural Vibration Noise Abatement of a Large Diesel Engine

Author(s): Varma, P. K. and Sudhir Kumar
Corporate Author: Department of Mechanics, Mechanical and Aerospace Engineering, Illinois Institute of Technology
Corporate Report Number: IIT-TRANS-76-1
Date of Publication: 1976-01
Contract: DOT-OS-40103

Abstract:
This report presents a vibration-noise investigation and a redesign of the top deck and the hand hole covers of GM 645E series railroad diesel engine for reduction of vibration and radiated noise. This was achieved by incorporating in the redesigned components, isolation, stiffening and damping. For damping, the solid friction, constrained layer and viscous air damping approaches were utilized. Experimental results on vibration and noise of the original and redesigned covers were obtained. It was found that a composite design with channel stiffened constrained layer outer panel and a fiberglass filled inner cavity offered the best solution. On-engine test at full load showed acceleration reductions of 2-40 dB for the redesigned composite top deck cover and 2-16 dB for the redesigned constrained layer hand hole cover. The composite design is recommended for both covers.

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