Artificial Boundary Conditions for Model Updating and Damage Detection

Gordis, Joshua H.

doi:10.1006/mssp.1998.0192

Cited by 23 publications

(13 citation statements)

References 5 publications

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“…The method of artificial boundary conditions [13], or ''pseudo-tests'' [14] offers those benefits while avoiding some of their drawbacks. The theory of ABC originates in the concept of the omitted coordinate system (OCS) [15] which plays a central role in the underlying properties of advanced model reduction techniques and frequency domain updating; see for example, [16][17][18][19][20][21][22].…”

Section: Artificial Boundary Condition Setsmentioning

confidence: 99%

“…The full development of the theory can be found in [13,15]. The experimental identification of the natural frequencies of an OCS involves the elimination of the rows and columns of H aa corresponding to the a-set coordinates to be artificially ''pinned'' to ground.…”

Section: Identification Of Natural Frequencies For An Omitted Coordinmentioning

confidence: 99%

“…''pinned'' to ground). In [13], it is shown that the natural frequencies of the structure under test, from a potentially large number of different boundary conditions, are available from a square FRF matrix measured from the structure, without having to physically apply the boundary conditions, i.e. artificial boundary conditions (ABC).…”

Section: Artificial Boundary Condition Setsmentioning

confidence: 99%

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Optimal selection of artificial boundary conditions for model update and damage detection

Gordis

Papagiannakis

2011

Mechanical Systems and Signal Processing

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Section: Artificial Boundary Condition Setsmentioning

confidence: 99%

Section: Identification Of Natural Frequencies For An Omitted Coordinmentioning

confidence: 99%

Section: Artificial Boundary Condition Setsmentioning

confidence: 99%

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Optimal selection of artificial boundary conditions for model update and damage detection

Gordis

Papagiannakis

2011

Mechanical Systems and Signal Processing

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“…Similarly, N. Nalitolela et al 6 suggested a method to add a point mass or point stiffness to measure additional natural frequencies of a perturbed system, and recently P. D. Cha et al 7 implemented this idea to obtain the unique solution of updating parameters. J. H. Gordis et al 8 and N. Nalitolela et al 9 suggested a methodology based on imaginary boundary conditions. Recently J. S. Lew and Juang 10 adopted an externally imposed feedback loop using collocated sensor and actuator to increase the modal information.…”

Section: Introductionmentioning

confidence: 99%

Model Updating Using the Closed-Loop Natural Frequency

Jung

Park

2005

Journal of Guidance, Control, and Dynamics

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Parameter modification of a linear finite element model (FEM) based on a modal sensitivity matrix is usually performed through an effort to match FEM modal data to experimental ones. However, there are cases where this method cannot be applied successfully; lack of reliable modal data and ill-conditioning of the modal sensitivity matrix constitute such cases. In this research, a novel concept of introducing feedback loops to the conventional modal test setup is proposed. This method uses closed-loop natural frequency data for parameter modification to overcome the problems associated with the conventional method based on modal sensitivity matrix. The feedback loop changes the modal characteristics of the system, and the closed-loop natural frequencies can be used as additional information to solve the problem caused by lack of reliable modal data. Through proper selection of exciter and sensor locations and associated feedback gains, the condition number of the modal sensitivity matrix can be reduced, and a more reliable estimation result can be expected. A parameter modification scheme based on the closed-loop natural frequency data along with the modal sensitivity modification and controller design method is explained. Proposed controller design method is efficient in changing modes. Numerical simulation of parameter estimation based on time-domain input/output data is provided to demonstrate the estimation performance of proposed method.

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“…The development of the "artificial boundary method (ABM)" (Gordis 1996(Gordis , 1999 paves the way for such an idea to be considered in civil engineering applications. It was demonstrated by Gordis (1996) that, by manipulating the incomplete frequency response function matrix measured at specific points on the existing structure, it is possible to identify resonance frequencies from the resulting frequency spectrum that exactly correspond to the natural frequencies of the structure as if additional pin supports were imposed at the specific locations.…”

Section: Introductionmentioning

confidence: 99%