Study On The Load And Strength Analysis Of Cutter Suction Dredger's Bridge

Dredgers are widely used in the many fields, such as soil removal and transportation, rivers and ports cleaning up, islets construction, etc. This kind of ship has an expansive market demanding, especially there are dredging works in china right now.Cutter suction dredgers must be one kind of the mostly used dredgers, which are equipped with a special cutter head. With a simple workmanship and could be used to dredge all kinds of soil with high efficiency, it is the main advantage of cutter suction dredger.Bridge is one of the principal assemblies of the cutter suction dredger, with one end connected to a cutter head, the other end based on the supporting hull structure by a trunnion. Because of the uncertainty of the work condition and interaction between the soil and cutter head, it is very difficult to predict the cutting force, and very important to analyze the strength of the bridge, trunnion, and supporting hull structure. Moreover, impact on the environment must be taken care of sufficiently.This paper makes use of the Two Dimension Cutting Theory to analyze the soil cutting process and calculate the load on the blades of the cutter head. Then, analyze the loads carried on the bridge system combined with every possible working condition. Establish the Finite Element Model of the bridge, trunnion and supporting hull structure, then to calculate the FEM and check the response concerned with stresses and displacements. If the caused stresses and displacements are high, it is necessary to make some local reinforcement; otherwise, it is advised to optimize the structures and scantlings in order to be economic, if only the structure can meet the strength requirements.It's unpractical for this dissertation to solve every problem that may meet during the production of the cutter suction dredger concerned with the bridge system, including its design, manufacture, and utilizing. However, as the reference to the structure strength of the bridge system, the work of this dissertation can theoretically make a firm instruction, and make a solid base for its further study and continuous improvement.