Abstract:
Due to ship incidents which happened in the Galapagos Islands. The dynamic and static
behavior of high-speed crafts is studied with the objective of determining the load conditions
that may lead them to capsize. They were applied the criteria of Porpoising, Chine walking,
maximum dynamic KG and Dead-Ship, which were programmed through python language. 3
experiments were performed to the ships: incline, roll balance and logarithmic decrement. The
simplified Ikeda’s method was implemented to determine the damping coefficient. The results
show that the craft 0075 does not have affinity with Dead-Ship but it is stable in Chine Walking,
the craft 1132 may suffer from Dead-Ship in any of the three considered loading conditions,
but it is on the limit in Chine Walking. The vessel 1202 may suffer from Dead-Ship in the third
loading condition and it has instability in Chine Walking. It is concluded that the crafts are
stable in porpoising and due to their forms, do not have good performance neither with Dead-
Ship nor with the simplified Ikeda’s method and it is recommended to carry out controls of the
damping coefficient and the weight of the ship because they are very important for the accuracy
of stability analysis. Finally, the stabilizers help to reduce the dynamic KG at high speed.
Keywords: Porpoising, Damping coefficient, Simplified Ikeda’s method, Dead-Ship
Description:
Debido a diversos incidentes de embarcaciones menores ocurridos en la Islas Galápagos y que
son de dominio público, en este proyecto se estudia a nivel preliminar la estabilidad estática y
dinámica de lanchas rápidas. Se aplicaron los criterios porpoising, chine walking y KG
Dinámico, se evaluó la condición de Dead-Ship, cuando las lanchas pierden propulsión. Se
realizaron 3 experimentos a las lanchas: inclinación, balance de rolido, y decremento
logarítmico. Se implementó el método simplificado de Ikeda para determinar el coeficiente de
amortiguamiento. Los resultados indican que la Lancha 0075 no tiene afinidad con el Criterio
Dead-Ship; es estable en chinewalking, la Lancha 1132 podría sufrir del modo de falla Dead-
Ship en las 3 Condiciones de carga consideradas; se encuentra en el límite de chine walking.
La Lancha 1202 es propensa a sufrir incidentes en su tercera condición de carga; Tiene
inestabilidad por chinewalking. Se concluye que las lanchas rápidas son estables en porpoising
y por sus formas no tienen buena afinidad con Dead-Ship ni con el método simplificado de
Ikeda y se recomienda llevar a cabo controles del coeficiente de amortiguamiento. Finalmente,
los apéndices ayudan a reducir el KG dinámico a altas velocidades.
