Electromagnetic Analysis of the ElectroDynamic Suspension with the Two Dimensional Finite Element Method
Recently the magnetic levitation vehicle has been studied actively. In Japan, the electro-dynamic suspension (EDS) has been studied. The EDS, however, has the disadvantages that the pulsation of the lift force occurs since coils on the ground are arranged intermittently and the construction cost become high since a number of coils are needed. In order to solve these defects, the EDS which has the lamination has been studied in Europe and America. These studies, however, assume that the lamination is infinite, although it is finite. This paper presents the electromagnetic analysis of the EDS which has the finite conductor with the two dimensional finite element method (2D FEM). Second, we calculate the characteristics of the EDS due to the difference of the form of the conductor. Third, we examine whether the 2D FEM is proper comparing the result of the 2D FEM with one of the general-purpose electromagnetic analysis software. Finally, the method and model of the two dimensional analysis taking the thickness of the conductor into account is presented.
Levitation Characteristics of Magnetically Suspended Vehicles Utilizing Continuous Conductive Sheets
In a magnetically levitated railway system with superconducting vehicular magnetic coil, short-circuiting ground coil, and a loop-type track, the magnetic field produced by ground coils is not uniform and therefore the lift force fluctuates as the train moves and the magnetic flux of the superconducting magnet fluctuates with time. The sheet-type track consists of continuous conductive sheets of aluminum or copper. The levitation characteristics of the sheet-type track have been analyzed so far by directly solving Maxwell's equation or by replacing the sheet current by an image current. In these analyses, it has usually been assumed that the sheet is infinitely or semiinfinitely wide. Until now, the levitation characteristics of a sheet-type track with finite width have been analyzed little. An analysis is given in which a ground sheet with finite width is replaced by a number of conductors with square cross section arranged in the running direction. Self- and mutual inductances of the conductors are taken into account in calculating the levitation characteristics. Calculated levitation characteristics of the sheet-type track are compared with those of the loop-type track.
Prediction of net pressure on pressure equalized cavities
Abstract A numerical model has been developed for prediction of net pressure on pressure equalized cavities. The results based on this model show good agreement with those obtained from mock-up tests. Parametric studies verify that reductions in cladding load are possible, with proper design of curtain walls.