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Coeficiente de amortiguamiento en balance del modelo de un buque pesquero con velocidad de avance

Abstract:

– In this work the roll motion damping coefficient of a sardine fishing vessel model without and with velocity is experimentally determined. This parameter is calculated from the transient oscillation register using a 2 m long model. The first tests with no velocity, are developed in a pool. For the tests with velocity the model is side-towed from an outboard powered boat; points of pull at the bow and direction guide at transom (stern) are at points of the flotation, which allows the model to freely oscillate around a longitudinal axis. For the tests, three load conditions and three values of metacentric height for each one were analyzed. Time registers of balance angle are numerically filtered, and with these signals damping coefficients are determined; finally through numerical simulations values for damping coefficients are confirmed. With the results from the first group of tests without velocity, starting the motion with relatively high heel angle, quadratic and cubic coefficients are also estimated. Results from the second group of tests show a large increment of the damping coefficient due to influence of the velocity. Results are compared with those from a well known semiempiral formulation.