Interface Damping: Characterization and Implementation

University dissertation from Stockholm : KTH Royal Institute of Technology

Abstract: Material damping in a structure is well defined and documented. However, dissipation due to mechanical contact (surface contact) in a complex built-up structure is not as well represented, in particular in large scale noise and vibration simulations. The present work is dealing with the understanding of the physical behaviour of losses that take place at such complex interfaces. The objective is to investigate, if, these mechanical loss phenomena can be modelled using linear response simulation techniques and implemented using commercially available finite element software. In a first step, the losses at the interfaces were experimentally investigated using an experimental setup capable of in-vacuo conditions. Following this, the second step was aimed at different ways of representing the proposed boundary conditions in a linear response simulation of a built-up structure. Two different approaches were studied, one using a continuous surface approach and one using a discrete element method.

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