Optimized Design And Dynamical Analysis Under Various Loading On The Feeder System For The Central Solenoid Magnet Of ITER

International Thermonuclear Experimental Reactor (ITER), whose purpose is to demonstrate the technological exactitude, engineering feasibility, operating security of thermonuclear fusion reactor for peaceful and safe purpose as an energy source, is an experimental self-combustibility Tokamak device developed by international cooperation. The feeder system for the central solenoid magnet coil is the penetration channel for superconducting busbars, cooling pipes, instrumentation cables and so on, which fulfills the task, such as power supply, cooling, and instrument that ensure normal operation of the magnet coils. So its design and manufacture of the feeder is very important.The subject is supported by the Major State Basic Research Development Program of China (973)--"the international major science collaborate plan" and "the design and preliminary research about superconducting feeder system of ITER". The structures of feeder are systematically and totally analyzed, and the optimization design method under various loading has been put forward. The optimized structural parameters have been gained, and the structural reliability has been validated by FEM numerical simulation analysis, dynamic mechanics analysis and experiments about them.Main research work and creative points of the paper are shown as follows:First, the space length between rectangle plate strengthening ribs and the moment of inertia of its combination section are designed, the bending stress and the membrane stress of them are calculated and checked at the same time. Based on the engineering and physics property request, the modeling, structural designing, intensity analyzing and parameters optimizing on the S-bend box, CTB box, In-duct straight-line pipe, superconducting Busbar are fulfilled, and the optimum structure style and structural parameters are gained.Second, based on small-deflection solution condition, the basic buckling equation on the thin-walled cylindrical shells of In-duct pipe is presented after its structural optimization, and then the numerical buckling analyses are investigated according to the energy-rule-based stability criteria and the eigen-value calculation principle of the buckling point. By analyzed and compared, the relation curve of critical buckling pressure with vary thick of the shell wall is obtained, meanwhile the buckling deformative models and the corresponding buckling pressures of the optimum structure under varied work conditions are achieved too. So the structure stability with new supports is elevated greatly, and the impossibility about destabilization phenomena both in normal or accident conditions are confirmed.Third, model analyses, seismic spectrum response analyses, seismic time-history analyses are performed successively based on the vibration eigenvalue theory, mode analytical theory, and seismic response spectrum theory. As a result, structure response extrema, and time-history curves between displacement, acceleration and stress response values and different times are acquired. Compared result datum about the seismic respond spectrum analysis with seismic time-history analysis, the structure vibrancy security of the feeder under seismic excitation is proved.Final, the similar model in experiment, which meets the needs of the all similarities between model and prototype busbar, such as geometry, physics, boundary condition, is established based on the similitude ratio theory, the construction aseismic design criterion, and the aseismic design criterion in nuclear power plant. Considering carrying and the dimension of the seismic simulative vibration desk, the design of the experimental model, experimental subject and experimental goals are discussed systematically. By applying various intension seismic promptings on the Busbar similar experiment model, the dynamical parameters, the response values of acceleration, displacement, strain, are acquired. Compared with simulation analytic results, the veracity and credibility of the experiments are proved, and dynamics security of the equipment is tested.