<正>Based on Morison Equation and the linear wave theory, this paper analyses the model test data about the total forces on a vertical circular cylinder under the regular or forced wave action, discusses the hydrodynamic coefficients in the ranges of 3 < Kc <52 for regular wave and 4 <Kc’ <45 for forced wave, and studies some varying regularities of the lift forces on the cylinder and their effects on the total forces.
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