Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 56 for “"model updating"”.
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Model Updating Using Neural Networks
Accurate models are necessary in critical applications. Key parameters in dynamic systems often change during their life cycle due to repair and replacement of parts or environmental changes. This dissertation presents a new approach to update system models, accounting for these changes. The …
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Model Updating Using a Quadratic Form
… in this thesis addresses the problem of updating an analytical model using a parametric Reference Basis approach. In this method, some parameters are assumed to be accurate (e.g. natural frequencies, mode shapes and mass matrix), while others are adjusted so that the eigenvalue equation …
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Finite Element Model Updating for Rotary Machinery
… of this thesis was to develop a mathematical model that represents a rotary machine. Experimental data was used to define a finite element model (FEM). In order to obtain the experimental data, the rotary machine had to be balanced. An impact hammer test made it possible to obtain frequency …
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On-line model updating in earthquake hybrid simulation
… constitutive relationship of the numerical model during the test, based on the data obtained from the physically tested component. Identifying the parameters that govern the constitutive relationship behavior from the experimental module is a challenging task. Hence, an approach based on …
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Operational modal analysis and model updating with a cyclostationary input
… can be recovered by employing finite element model updating in conjunction with this regeneration. In addition, the contribution made to model updating by the anti-resonances is also investigated. Finally, the potential of OMA to inform a model updating process is demonstrated using an …
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Vibration-based finite element model updating and structural damage identification
… are to develop a procedure for finite element model updating by using incomplete modal data identified from vibration measurements, to develop real time structural damage detecting method by directly using vibration measurements and then identify the damage at detailed location and extend in …
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Computation of a Damping Matrix for Finite Element Model Updating
… dominated by energy dissipation. The process of modeling damping matrices and experimental verification of those is challenging because damping can not be determined via static tests as can mass and stiffness. Furthermore, damping is more difficult to determine from dynamic measurements than …
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Finite element model updating and damage detection using artificial boundary conditions
… conditions. Use of the ABCs in sensitivity-based model updating and damage detection in conjunction with baseline data provides improved error localization and results in a more accurate finite element model.
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Identification, reduced order modeling and model updating of nonlinear mechanical systems
… nonlinear system identification, reduced order modeling and nonlinear model updating, applicable to a broad class of dynamical systems. The global aspect of the approach is based on analyzing the free and forced dynamics of the system in the frequency-energy domain through the construction of …
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Continuous reservoir model updating by ensemble Kalman filter on Grid computing architectures
… simulation studies and continuous reservoir model updating. The toolkit provides reservoir engineers with high performance computing capacity to complete their projects without requiring them to delve into Grid resource heterogeneity, security certification, or network protocols. <p …
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Model updating of modal parameters from experimental data and applications in aerospace
… the correction of the corresponding mathematical models using the results of experimental investigations as a reference. A comprehensive finite-element model updating software technology is assembled and various novel features are implemented. The software technology is integrated into an …
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Analysis of Glubam Joint Behavior and Truss Model Updating Based on Optimization Algorithms
… design theories and reliable numerical modeling approaches are still lacking. Moreover, integrating artificial intelligence (AI) optimization algorithms into the seismic performance analysis of glubam structures represents a promising yet underexplored research direction. In response to …
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Bayesian-based Finite Element Model Updating, Damage Detection, and Uncertainty Quantification for Cable-stayed Bridges
… with uncertainty in measurements and analytical models of structures, performing a real-world application of Bayesian Finite Element (FE) model updating, and Bayesian-based damage detection. The proposed research focuses on the following tasks: 1) development of an autonomous data pre-processing …
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Data-driven system identification of strongly nonlinear modal interactions and model updating of nonlinear dynamical systems
… the calibration and validation of computational models. When a model fails to reproduce measurements, engineers must identify and incorporate the unmodeled and/or uncertain dynamics to reconcile theoretical prediction and experimental observation. While linear identification tools are …
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Finite element model updating of concrete arch dams affected by alkali-silica reaction using ambient vibration monitoring and dam surveillance data
… structural behaviour analysis through numerical models such as finite element (FE) models, is a crucial aspect of dam safety evaluations that allows dam safety engineers to predict the current and future behaviour of dams under various load combinations. The challenge in finite element analysis …
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Model parameter identification and model class selection in piezoelectric energy harvester based on bayesian inference
The model updating of the electro-mechanical properties of Piezoelectric Energy Harvesters (PEHs) using experimental data within a Bayesian inference setting is discussed. The implementation requires: a predictive model for the harvester response; an assumption for its prediction error; a prior …
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Damage identification of unreinforced masonry structures based on vibration response
… in identifying damage. Numerical and physical models were used to analyse the applicability of system and damage identification techniques to non-slender URM buildings. Modal tests were conducted on two undamaged URM panels and an undamaged model of a one-storey URM house. Impacts with a …
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Continuous reservoir modeling updating by integrating experimental data using an ensemble Kalman Filter
The continuous researvoir model updating is widely used to calibrate reservoir simulation models to production data, but many challenges remain. First, few real field data are available to test the new history matching method, and most of the data sets are synthetic cases. Second, computational …
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Structural assessment of bridges using monitoring data
… health monitoring (SHM) technologies and model updating techniques, i.e., the integration of structural monitoring data with structural analysis modelling, in bridge operation and maintenance (O\&M) activities. Many bridge practitioners question whether these technologies and techniques …
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