Using SEMM to Identify the Joint Dynamics in Multiple Degrees of Freedom Without Measuring Interfaces

Klaassen, Steven W. B.; Rixen, Daniel J.

doi:10.1007/978-3-030-12184-6_10

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…In this work, the SEMM method is exploited to generate such a hybrid coupled model Y S,AJB which explicitly contains boundary dynamics. The method was originally proposed in [41] on a numerical test-case and then applied by the authors of the present paper to the real case in [28,42]. The method, which this time uses models generated with the correlated SEMM, is explained here and applied to the blade-disk assembly in Section 8.…”

Section: Coupled Structure Modelsmentioning

confidence: 99%

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Joint Identification through Hybrid Models Improved by Correlations

Saeed,

Firrone,

Berruti

2021

Preprint

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Section: Coupled Structure Modelsmentioning

confidence: 99%

“…The initial guess of Y J k at k = 1 can be a blank joint i.e. the substructures can be left uncoupled [28,41].…”

Section: Joint Decouplingmentioning

confidence: 99%

Joint Identification through Hybrid Models Improved by Correlations

Saeed,

Firrone,

Berruti

2021

Preprint

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“…This strategy was first proposed in Ref. [33] and applied to a simple numerical truss structure. It is outlined in a different manner and applied to a complex interface in this paper.…”

Section: Virtual Point Interfacementioning

confidence: 99%

“…It was applied on a numerical truss structure in Ref. [33]. The underlying assumption is that, in the assembled structure, the joint dynamics are implicitly and sufficiently observed by measurements at the internal DoF.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Joint Identification Using System Equivalent Model Mixing in a Bladed Disk

Saeed

Klaassen

Firrone

et al. 2020

Journal of Vibration and Acoustics

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Abstract A joint between two components can be seen as a means to transmit dynamic information from one side to the other. To identify the joint, a reverse process called decoupling can be applied. This is not as straightforward as the coupling, especially when the substructures have three-dimensional characteristics, or sensor mounting effects are significant, or the interface degrees-of-freedom (DoF) are inaccessible for response measurement and excitation. Acquiring frequency response functions (FRFs) at the interface DoF, therefore, becomes challenging. Consequently, one has to consider hybrid or expansion methods that can expand the observed dynamics on accessible DoF to inaccessible DoF. In this work, we attempt to identify the joint dynamics using the system equivalent model mixing (SEMM) decoupling method with a virtual point description of the interface. Measurements are made only at the internal DoF of the uncoupled substructures and also of the coupled structure assuming that the joint dynamics are observable in the assembled state. Expanding them to the interface DoF and performing coupling and decoupling operations iteratively, the joint is identified. The substructures under consideration are a disk and blade—an academic test geometry that has a total of 18 blades but only one blade-to-disk joint is considered in this investigation. The joint is a typical dove-tail assembly. The method is shown to identify the joint without any direct interface DoF measurement.

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Identification of Bolted Joint Properties Through Substructure Decoupling

Brunetti

D’Ambrogio

Manno

et al. 2022

Conference Proceedings of the Society for Experimental Mechanics Series

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Substructure decoupling techniques, defined in the frame of Frequency Based Substructuring, allow to identify the dynamic behaviour of a structural subsystem starting from the known dynamics of the coupled system and from information about the remaining components. The problem of joint identification can be approached in the substructuring framework by decoupling jointed substructures from the assembled system. In this case, information at the coupling DoFs of the assembled structure are necessary and this could be a problem if the interface is inaccessible for measurements. Expansion techniques can be used to obtain the dynamics on inaccessible (interface) DoFs starting from accessible (internal) DoFs. A promising technique is the System Equivalent Model Mixing (SEMM) that combines numerical and experimental models of the same component to obtain a hybrid model. This technique has been already used in an iterative coupling-decoupling procedure to identify the linear dynamic behaviour of a joint, with a Virtual Point description of the interface. In this work, a similar identification procedure is applied to the Brake Reus Beam benchmark to identify the linear dynamic behaviour of a three bolted connection at low levels of excitation. The joint is considered as a third independent substructure that accounts for the mass and stiffness properties of the three bolts, thus avoiding singularity in the decoupling process. Instead of using the Virtual Point Transformation, the interface is modelled by performing a modal condensation on remote points allowing deformation of the connecting surfaces between subcomponents. The purpose of the study is to highlight numerical and ill-conditioning problems that may arise in this kind of identification.

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Using SEMM to Identify the Joint Dynamics in Multiple Degrees of Freedom Without Measuring Interfaces

Cited by 7 publications

References 7 publications

Joint Identification through Hybrid Models Improved by Correlations

Joint Identification through Hybrid Models Improved by Correlations

Experimental Joint Identification Using System Equivalent Model Mixing in a Bladed Disk

Identification of Bolted Joint Properties Through Substructure Decoupling

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