Frequency Based Substructuring allows to directly couple separate component models. Combining models (in free-free condition) usually does not represent complex interface dynamics of the assembled system AB.
Some parts of the interface dynamics (friction/contact etc.) are challenging to model numerically. Therefore, we try to capture them experimentally in the component model using a Transmission Simulator (TS) that recreates the boundary conditions of the real assembly. An additional advantage of substitute coupling is to measure and/or excite the rotational and flexible modes at the interface of a subsystem that would otherwise not be accessible. A TS adds dynamical effects which are not part of the substructure (e.g., additional mass/stiffness). If they are relevant, they can be decoupled using Frequency Based Substructuring. An example of a TS design is depicted below:
Practical benefits of using Transmission Simulators:
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