Summary
The dynamic analysis for a Finite Element (FE) model requires careful consideration of all coupled modes, especially when strong dynamic coupling occurs, e.g. internal resonances; however, it is not trivial to identify these modes without a priori knowledge of their existence. In this work, we show a method to detect dynamic coupling in FE models based on indirect reduced-order modelling, which is suitable for commercial FE software. Specifically, we develop a technique which is applicable to FE models with a large number of Degrees-of-Freedom (DoFs), removing the need to solve the complete eigenproblem. To demonstrate the method, a clamped-pinned beam is analysed, in which the present method efficiently reveals the location of the dynamic coupling in the frequency domain.
