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<p>Ship silencing is an important issue of modern naval warfare. For a long time, naval ship engineers have tried to reduce the noise from the vibration of shipboard components. Ths is important for a ship to accomplish its mission with good survivability. One method, called constrained viscoelastic layer method, uses shear deformation in viscoelastic material to absorb and dissipate the vibrational energy of the system. It shows promise in damping over a broad frequency spectrum of vibration. A finite element technique developed by Johnson and Kienholz Ref.1 known as the Modal Strain Energy (MSE) method which uses the ratio of strain energy for each mode shape to approximate the modal damping of a structure for a given constrained viscoelastic damping system. The method is very attractive due to its simple concept and very useful because it can be applied to any general cases with arbitrary shape by using the finite element method.
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<br>Subjects: Mechanical engineering; Sound.; Vibration; damping; viscoelastic material; constrained layer damping</div>
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Ping, Hsin-Chih.</div>
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