Abstract
A time-domain calculation method is described for elastic responses to arbitrary time-dependent external loads, on the basis of a general differential equation of second order including the convolution integral related to memory effects in the hydrodynamic forces. The time-dependent elastic deflection of a structure is represented by a superposition of mathematical modal functions, and a Galerkin scheme is employed to obtain a linear system of simultaneous differential equations for the amplitude of modal functions assumed. Special care is paid to numerical accuracy in computing the memory-effect function and the added mass at infinite frequency. The validity of the numerical results was confirmed through a comparison with time histories of the vertical deflection measured in an impulsive weight-drop test conducted at the Ship Research Institute and a comparison with existing numerical results for the same problem. To check the necessity of memory-effect terms, computations using a constant value for the hydrodynamic damping coefficient were also performed, and practical measures for reducing the computation time are discussed.
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Received: April 12, 2000 / Accepted: August 24, 2000
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Kashiwagi, M. A time-domain mode-expansion method for calculating transient elastic responses of a pontoon-type VLFS. J Mar Sci Technol 5, 89–100 (2000). https://doi.org/10.1007/PL00010631
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DOI: https://doi.org/10.1007/PL00010631