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On the experimental coupling with continuous interfaces using frequency based substructuring
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DOI：10.1016/j.ymssp.2024.111517.png)
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Abstract
En 中文
In experimental dynamic substructuring, coupling of substructures sharing a line- or surfacelike interface proves to be a challenge due to the difficulties in interface modelling. Modelling a high number of degrees of freedom at the common interface can be too stringent when imposing compatibility and equilibrium conditions, thereby causing redundancy and ill-conditioning. To mitigate the effects of overdetermination and experimental errors, that can lead to a high error amplification, several techniques have been developed, proposing different reduction spaces to weaken the interface conditions. This work investigates reduction space definitions in dynamic substructuring for coupling continuous interfaces. In particular, a comparative investigation of three established techniques, namely the frequency -based modal constraints for fixture and subsystem, singular vector transformation, and virtual point transformation, is conducted within the frequency domain. The feasibility of all approaches is supported by an experimental case study, which can guide practitioners in selecting a suitable approach for their specific needs.
Keywords:
Frequency based substructuring
Continuous interface
Modal constraints for fixture and subsystem
Singular vector transformation
Virtual point transformation
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6.6W