The electrodynamic suspension system (EDS) is one of the magnetic levitation system and has advantage of stable levitation without the gap control. However, the damping factor of the EDS system is not enough. Once the oscillation of the bogie occurs by the external disturbance, it does not converge immediately. The additional damper system is needed, so the damper coil system is installed. By the semi-active damper system, the levitation stability is improved. This paper discusses about superconducting Maglev system as application of the EDS system. Superconducting Maglev has been the magnetic levitation system developed by Central Japan Railway Company and Railway Technical Research Institute. The operation speed of the train is v = 120[m/sec]. At low speed range such as v = 60-80[m/sec], the damping factor is smaller than that of the normal operation v = 120[m/sec], and it is difficult to keep the stable levitation. In this paper, running simulation when the bogie passes large displacement at low speed is undertaken, and the improved switching method for the semi-active damper system at low speed and large displacement is discussed. From the results, to increase the period that the damper coil works. The damping factor becomes larger, and the bogie keeps the levitation.
The electrodynamic suspension system (EDS) realizes stable levitation without the gap control. One of its application is JR Maglev. The EDS system has basically no damping factor against the disturbance. The damping factor is improved by installing the additional coil. However, the damping factor is needed especially at the low velocity. The normal operation velocity in the JR Maglev is the velocity vx
= 120[m/sec]. The optimal shape and installation position of the damper coils at the low velocity range such as vx
< 80[m/sec] is discussed. The type of the damper coil system and the velocity do not affect the optimal height of the coil. The optimal width of the damper coil in the semi-active system is 8.9% smaller than that in the passive one. The optimal installation position is higher at the low velocity than that at the normal operation velocity in both damper system type. By this optimization, the vertical oscillation is up to 13.6% smaller and the pitching oscillation is up to 11.0% smaller.
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