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Identification of stiffness and damping of the weld in stiffened plates using model updating
https://orcid.org/0000-0002-1915-4822
https://orcid.org/0000-0002-3015-9667
Abstract Stiffened structures form an integral part of the ship structure. The fatigue life and the load-carrying capacity of the ship structure are dependent on the stiffened panels. Stiffened structures are formed by welding beam stiffeners on bare plates. The current study proposes a methodology to accommodate the welding uncertainties in the theoretical model. The uncertainties in the strength and damping of the weld line are incorporated, using coupling spring and dampers. The coupling elements couples the beam and plate subsystems of the stiffened structure assembly. A representative model of a stiffened structures is developed. Model updating on the representative model is carried out based on simulated experimental data using the inverse eigensensitivity method. The coupling spring stiffnesses were identified using model updating. The algorithm was verified for the ability to capture the variability of strength along the weld line. The variation in damping due to welding was determined on the updated model using a damping identification technique, which requires prior knowledge of accurate stiffnesses of the weld. Studies were carried out to investigate the robustness of the proposed algorithm by inducing random noise in the modal parameters. The generated Frequency Response Function (FRF) was verified to be sufficiently stable against the random perturbations of the modal parameters. It can be concluded from the numerical studies that the proposed algorithm can be used for the identification of dynamic characteristics of the welded stiffened plates with confidence.
Highlights Stiffened welded plate modeled as a coupled system. Coupled system consists of beam and plate coupled using springs and dampers. Inverse Eigensensitivity method (IESM) was implemented to update the coupling spring stiffness. Damping due to the welding process determined using damping identification. Determined the robustness of the algorithm against simulated experimental noise.
Identification of stiffness and damping of the weld in stiffened plates using model updating
https://orcid.org/0000-0002-1915-4822
https://orcid.org/0000-0002-3015-9667
Abstract Stiffened structures form an integral part of the ship structure. The fatigue life and the load-carrying capacity of the ship structure are dependent on the stiffened panels. Stiffened structures are formed by welding beam stiffeners on bare plates. The current study proposes a methodology to accommodate the welding uncertainties in the theoretical model. The uncertainties in the strength and damping of the weld line are incorporated, using coupling spring and dampers. The coupling elements couples the beam and plate subsystems of the stiffened structure assembly. A representative model of a stiffened structures is developed. Model updating on the representative model is carried out based on simulated experimental data using the inverse eigensensitivity method. The coupling spring stiffnesses were identified using model updating. The algorithm was verified for the ability to capture the variability of strength along the weld line. The variation in damping due to welding was determined on the updated model using a damping identification technique, which requires prior knowledge of accurate stiffnesses of the weld. Studies were carried out to investigate the robustness of the proposed algorithm by inducing random noise in the modal parameters. The generated Frequency Response Function (FRF) was verified to be sufficiently stable against the random perturbations of the modal parameters. It can be concluded from the numerical studies that the proposed algorithm can be used for the identification of dynamic characteristics of the welded stiffened plates with confidence.
Highlights Stiffened welded plate modeled as a coupled system. Coupled system consists of beam and plate coupled using springs and dampers. Inverse Eigensensitivity method (IESM) was implemented to update the coupling spring stiffness. Damping due to the welding process determined using damping identification. Determined the robustness of the algorithm against simulated experimental noise.
Identification of stiffness and damping of the weld in stiffened plates using model updating
https://orcid.org/0000-0002-1915-4822
https://orcid.org/0000-0002-3015-9667
Abstract Stiffened structures form an integral part of the ship structure. The fatigue life and the load-carrying capacity of the ship structure are dependent on the stiffened panels. Stiffened structures are formed by welding beam stiffeners on bare plates. The current study proposes a methodology to accommodate the welding uncertainties in the theoretical model. The uncertainties in the strength and damping of the weld line are incorporated, using coupling spring and dampers. The coupling elements couples the beam and plate subsystems of the stiffened structure assembly. A representative model of a stiffened structures is developed. Model updating on the representative model is carried out based on simulated experimental data using the inverse eigensensitivity method. The coupling spring stiffnesses were identified using model updating. The algorithm was verified for the ability to capture the variability of strength along the weld line. The variation in damping due to welding was determined on the updated model using a damping identification technique, which requires prior knowledge of accurate stiffnesses of the weld. Studies were carried out to investigate the robustness of the proposed algorithm by inducing random noise in the modal parameters. The generated Frequency Response Function (FRF) was verified to be sufficiently stable against the random perturbations of the modal parameters. It can be concluded from the numerical studies that the proposed algorithm can be used for the identification of dynamic characteristics of the welded stiffened plates with confidence.
Highlights Stiffened welded plate modeled as a coupled system. Coupled system consists of beam and plate coupled using springs and dampers. Inverse Eigensensitivity method (IESM) was implemented to update the coupling spring stiffness. Damping due to the welding process determined using damping identification. Determined the robustness of the algorithm against simulated experimental noise.
Identification of stiffness and damping of the weld in stiffened plates using model updating
Shrivastava, Kshitij (author) / Vijayan, Kiran (author) / Arora, Vikas (author)
Marine Structures ; 82
2021-12-02
Article (Journal)
Electronic Resource
English
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