Research On Dynamics Of Nuclear Power Polar Crane To Real Structure And Mechanism

Nuclear power is valued because of its high efficiency and low cost.After several major nuclear leakage accidents,nuclear power equipment with high safety and advanced technology has attracted attention of researchers.Nuclear power industry has ushered in a new development opportunity,which will lead to a new era of clean energy revolution.Nuclear power crane is an important equipment used for hoisting operations in nuclear power plants.The nuclear power polar crane is one of the most representative cranes in nuclear power plant,which is located on the loop track of the nuclear island.During the construction of nuclear power plant,it is used for the installation of reactor pressure vessel,steam generator and other equipment.During the nuclear power plant shutdown to replace nuclear fuel,it is used for the lifting of pressure vessel roof.During the maintenance of nuclear power plant,it is used for hoisting other large parts.The nuclear power polar crane is the part directly related to the safety of nuclear power plant.According to the real structure and mechanism of the nuclear power polar crane,the concrete 3D model of the nuclear power polar crane is established by multi-body dynamics software.In particular,the establishment of steel wire rope and pulley system is precise,considering the flexibility of steel wire ropes,the winding of the steel wire ropes in the pulleys groove and the tangential connection between the pulleys.The orderly winding style is realized.The established 3D model is both real to reearch and easy to solve.The solver is used to solve the model,and the result data and graph lines are obtained.The dynamic process of the model is analyzed and studied.The results show that the vibration of nuclear power polar crane is a complex multi-degree of freedom problem.In the starting stage and braking stage of each mechanism,the vibration is obvious.The consistency between model simulation and actual hoisting are improved by the accurate modeling of wire ropes and pulleys system.The safety of one wire rope in sudden failure are ensured by the special twin-wire ropes winding method,while the hoisting weight can still be suspended in the air relying on the other wire rope.The impact of the steel wire ropes and vibration of the system are greatly reduced by setting the buffer device.Shown in this thesis,it is necessary to establish a coexist multi-degree of freedom model of nuclear power polar crane with the real structure and mechanism,which is helpful to study the accurate dynamic process of nuclear power polar crane.After taking certain measures,the vibration of nuclear power polar crane is reduced,which is more conducive to ensuring its high safety,providing a basis for further research on the dynamics of nuclear power polar crane and rules for the design of nuclear power polar crane.