Study On Hydrodynamic Performance And Workability Analysis Of The Cutter Suction Dredger

With the continuous development of the world's ship transport industry,China's port construction and channel dredging demand continues to increase,in addition,the domestic coastal areas of large reclamation projects continue to emerge,driven by the rapid development of cutter suction dredger,China Design and construction of the dredger for the river flood control,marine resources development and shipping to provide a strong technical and equipment protection.The cutter suction dredger is a complex,high-tech marine equipment.In the design process,there are a lot of design key technologies and difficulties.The spud system is one of the key technologies in this kind of ship.It is complicated by force,high damage rate and it is urgent to study and improve it.Fluent software was used to calculate the current load of 7025 type cutter suction dredger at different water depth and incoming angle.7025 type cutter suction dredger is a non-streamlined type.Compared with the current force coefficient on the streamlined VLCC,it is found that the longitudinal current force coefficient of the two types is different.In addition,the shape of the ladder of the 7025 type cutter suction dredger is a square column with many openings on the panel.The longitudinal current force of the ladder is increased with the depth of the water.When the working depth is large,the longitudinal current force acting on the ladder will be greater than that on the hull,and therefore can not be ignored.In the dredging condition,it is assumed that the spud pole is rigid,that is,the effect of the spud pole on the motion response of the cutter suction dredger is not considered.Since the gap between the spud pole and the hoop is small,it is assumed that the surge,the sway,the roll and the pitch motion of the cutter suction dredger are constrained at the spud pole,and only have the heave and roll motion.Under the action of wave load,the force of the cutter suction dredger is analyzed,and the calculation formula of the wave load transmitted to the spud pole is deduced.Under the action of wind,wave,current,cutter load and swing mooring load,the force and deformation analysis of the spud pole are analyzed under the three kinds of working conditions: dredging transversely,advance longitudinally and anchor mooring.The wave load of the cutter suction dredger under different wave conditions is calculated,and the limit operation ability of the cutter suction dredger is analyzed,which provides guidance for its dredging operations.Ladder hanging from the surface conditions,the elastic spud pole is simplified as a linear system.The effect of elastic spud pole on the motion response of the cutter suction dredger is considered by adding additional stiffness to the motion equation.Calculate the shear force and bending moment of the cutter suction dredger to the clamp under the spud pole.