Experimental and Theoretical Approach to the Estimation of Non-Linear Vertical Wave Loads

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Accurate estimation of wave loads acting on a ship is a long-lasting task for naval architects. Recently, a new approach for the investigation of non-linear characteristics of wave loads was introduced; namely, combination of experiments using "elastic model" an_ d non-1inear digital simulation. In this paper, at first, possible constructron techinques of "elastic model" are examined. Adopting "backbone model" composed of segmented hulls and a metal backbone representing ship's longitudinal rigidity, two series of model experiments were carried out for a high-speed cargo vessel with different values of backbone's rigidity . Application of "backbone model" makes it easy to change model's longitudinal rigidity. Using as high rigidity backbone as possible, vibration response components can be reduced and responses almost as a rigid body can be measured. Replacing the backbone with the one having corresponding rigidity to the full scale ship, approximate responses of the ship can be measured. By the examination of dynamic characteristics of the model, vibration modes and modal damping coefficients were obtained, and the damping coefiicients were found to be very close to those of full scale ships. It means that close correspondence between model experiments and full scale phenomena can be obtained . A digital simulation program was developed for the estimation of nonlinear heave and pitch motions, vertical bending moment and shearing force. Compared with the results measured through the model test, calculated results seem to predict non-1inear characteristics fairly well.
社団法人日本船舶海洋工学会の論文

Experimental and Theoretical Approach to the Estimation of Non-Linear Vertical Wave Loads

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