Optimization of Vibration Mount Properties for Application to Shipboard Diesel Engines - Phase III


  1. Hutton, S.G.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
This report describes the theory and capabilities of MATLAB programs that have been developed in order to assist in the optimal vibration design of isolators for marine engines. These programs calculate the vibration transmissibility characteristics of the system and are of value in the design of optimal isolation systems. A program is also developed for the analysis of the active control of transmitted vibrations. The frequency range of interest is that encompassing the natural frequencies of the engine on its support system. The general system that is analysed consists of an engine supported by vibration isolators on a foundation raft that itself is supported to ground by vibration isolators. The programs model the engine as a rigid body. The foundation raft can be modeled as a rigid body, or it can be modeled as a flexible body using beam finite elements. It is assumed that the isolators can be modeled as an isotropic linear viscoelastic material in terms of both a complex Young's modulus and a complex Poisson's Ratio, both of which are frequency dependant. The report describes three different approaches to the modeling of the isolators: 1) an approach based upon finite element analysis of the viscoelastic isolators using constitutive data of the isolator material; ii) an approach based upon the results of dynamic stiffness measurements conducted on engine mounts. TRUNCATED

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Active vibration control;Computer programs (MATLAB);Diesel engine vibration;Engine mounts;Resilient suspension;Vibration isolation;Viscoelasticity
Report Number
DREA-CR-2000-077 — Contractor Report
Date of publication
01 Jan 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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