Dynamic Stability of Maglev Systems Page: 2
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Some analytical and experimental studies have been performed to
understand the stability characteritics of maglev systems. Several examples are
summarized briefly as follows:
1.1 Theoretical Studies
* Davis and Wilkie (1971) studied a magnetic coil moving over a
conducting track and concluded that negative damping occurs at
velocities greater than the characteristic velocity based on thin-track
* Ohno et al. (1973) studied the pulsating lift forces in a linear
synchronous motor. These forces may cause parametric and
combination resonances, as well as heave and pitch oscillations.
* Baiko et al. (cited in Chu and Moon 1983) considered the interactions
of induced eddy currents with on-board superconducting magnets
and found possible heave instabilities.
1.2 Experimental Studies
* An experimental vehicle floating above a large rotating wheel was
found by Moon (1974) to have sway-yaw instabilities.
* Experiments performed at MIT on a test track showed pitch-heave
instability (Moon 1975).
1.3 Experimental/Analytical Studies
a A conducting guideway, consisting of L-shaped aluminum segments
attached to a rotating wheel to simulate the Japanese full-scale
guideway at Miyazaki, was studied experimentally and analytically
by Chu and Moon (1983). Divergence and flutter were obtained for
coupled yaw-lateral vibration; the divergence leads to two stable
equilibrium yaw positions, and the flutter instability leads to a limit
cycle of coupled yaw and lateral motions in the neighborhood of the
* Variation of the magnetic lift force due to variation of the levitated
height corresponding to the sinusoidal guideway roughness was
studied by Yabuno et al. (1989). Parametric resonance of heaving and
pitching motions is possible.
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Cai, Y.; Chen, Shoei-Sheng; Mulcahy, T. M. & Rote, D. M. Dynamic Stability of Maglev Systems, report, April 1992; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc283120/m1/6/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.