Finite element modelling of machinery vibration isolation systems

D.C. Stredulinsky

Abstract


Vibration isolation of ship machinery is needed to achieve low radiated and habitable space noise levels. Shipboard isolation systems can be more difficult to design than similar systems on land due to space restrictions, weight limitations and ship motion considerations. Supporting foundation structures are often lightweight and relatively flexible and can influence the isolation system effectiveness. DREA is enhancing an in-house finite element vibration and strength analysis code VAST to facilitate the analysis of passive vibration isolation systems. The author describes the application of VAST to two problems. The first examines a simple machine decoupled from a flexible foundation structure using sixteen resilient isolators. The second considers the prediction of the natural frequencies of vibration of a helical compression spring isolator

Keywords


acoustic noise; finite element analysis; noise abatement; vibrations; ship machinery; space noise levels; weight limitations; foundation structures; isolation system effectiveness; passive vibration isolation systems; resilient isolators; helical compression spring isolator

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