On the physically consistent characterisation of a system for FRF-based substructuring

Contartese, Nicola; Nijman, Eugène; Desmet, Wim

doi:10.1016/j.jsv.2021.116073

Cited by 2 publications

(2 citation statements)

References 31 publications

(43 reference statements)

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“…A well-behaved system is created while minutely affecting the original FRF matrix. The technique described here is an adaptation of the work presented by the authors in [30]. There, a constrained optimisation scheme was introduced to build a physically consistent dynamic model of a subsystem starting from numerical data of the assembled system.…”

Section: Methodology To Restore Physical Consistencymentioning

confidence: 99%

“…This filter performs an eigenvalue decomposition of the real part of the mobility matrix and then re-synthesises the matrix by deleting the contributions due to the negative eigenvalues. In [22] and [30] it has been shown that the filtered eigenvalues are in magnitude much smaller than the dominant (positive) ones, suggesting that they do not carry important information. The collocation of the conditioning filter downstream from the optimisation problem assures hence a physical consistent behaviour whilst minutely affecting the input FRF matrix.…”

Section: Constrained Model Estimationmentioning

confidence: 99%

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A procedure to restore measurement induced violations of reciprocity and passivity for FRF-based substructuring

Contartese

Nijman

Desmet

2022

Mechanical Systems and Signal Processing

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Section: Methodology To Restore Physical Consistencymentioning

confidence: 99%

Section: Constrained Model Estimationmentioning

confidence: 99%

A procedure to restore measurement induced violations of reciprocity and passivity for FRF-based substructuring

Contartese

Nijman

Desmet

2022

Mechanical Systems and Signal Processing

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Coupling of Component Models with Mismatching Interfaces for an Efficient NVH Vehicle Design

Contartese

Nijman

Desmet

2022

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">The NVH optimization of new vehicle models can in principle only be carried out in a relatively late stage of the development process, when the geometrical data (CAD) are available and can be used to generate detailed Finite Element (FE) models of the car body. Unfortunately, in this stage of the development process most of the geometrical data are already fixed and countermeasures are limited and expensive. In order to be able to evaluate design concepts in an earlier conceptual stage of the development process existing models of similar predecessor vehicles must be used leading to techniques such as “mesh-morphing” or “concept modelling” (see for instance [<span class="xref">1</span>, <span class="xref">2</span>]). Here, a different approach is investigated based on a substructuring technique. In principle the coupling of the component-structures coming from different models would require post-processing in order to obtain compatible interface degrees-of-freedom (DOFs), an operation which in most cases must be carried out manually and is very time consuming. This paper presents a novel substructuring approach that tackles a continuous interface by only considering a small set of coupling DoFs. This approach employs the discretisation of interfaces between structural parts or structural-acoustic domains in terms of pivotal points and patches. In this manner, the requirement of spatial continuity between the models of the separate substructures is no longer needed and subsystems with incompatible interfaces can be coupled. Thus, an efficient vibro-acoustic design optimisation procedure for components shared by different vehicle models, such as the car floor, is enabled. It will be shown that a single car floor model can be successfully coupled with different upper-body structures, even when they have a different location of coupling DoFs.</div></div>

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On the physically consistent characterisation of a system for FRF-based substructuring

Cited by 2 publications

References 31 publications

A procedure to restore measurement induced violations of reciprocity and passivity for FRF-based substructuring

A procedure to restore measurement induced violations of reciprocity and passivity for FRF-based substructuring

Coupling of Component Models with Mismatching Interfaces for an Efficient NVH Vehicle Design

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