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An efficient system identification approach to estimate unsteady loads on cavitator plates

Tehrani, M. A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.oceaneng.2020.107444
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. A new and efficient model for calculation of the unsteady hydrodynamic loads on an oscillating plate in two-dimensional flow is proposed. In order to compute the hydrodynamic loads, an unsteady hydrodynamic model is derived using the boundary-element method along with the potential flow assumption. To this aim, the steady boundary of cavity is determined by a full-nonlinear iterative procedure. Thereafter, assuming that amplitude and frequency of oscillations are so that the length of cavity in unsteady flow remains intact, simulation of the unsteady hydrodynamic flow is performed by imposing some velocity perturbations over the steady cavity solutions. Consequently, based on this formulation, a system identification method is used to obtain a linear model for determination of the applied forces on the plate in unsteady flow. Results obtained using the proposed algorithm are verified. © 2020
  6. Keywords:
  7. Boundary element method ; Potential flow ; Supercavitation ; System identification ; Hydrodynamics ; Iterative methods ; Religious buildings ; Sailing vessels ; Frequency of oscillation ; Hydrodynamic flows ; Hydrodynamic loads ; Hydrodynamic model ; Oscillating plates ; System identification methods ; Two-dimensional flow ; Velocity perturbation ; Oscillating flow ; Algorithm ; Amplitude ; Flow velocity ; Perturbation ; Unsteady flow
  8. Source: Ocean Engineering ; Volume 207 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0029801820304662