Dynamic Stability of Maglev Systems Page: 1
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Dynamic Stability of Maglev Systems
Y. Cai, S. S. Chen, T. M. Mulcahy, and D. M. Rote
Because dynamic instability is not acceptable for any commercial maglev
systems, it is important to consider this phenomenon in the development of all
maglev systems. This study considers the stability of malev systems based on
experimental data, scoping calculations, and simple mathematical models.
Divergence and flutter are obtained for coupled vibration of a three-degree-of-
freedom maglev vehicle on a guideway consisting of double L-shaped aluminum
segments attached to a rotating wheel. The theory and analysis developed in this
study identifies basic stability characteristics and future research needs of maglev
The dynamic response of maglev systems is important in several respects:
safety and ride quality, guideway design, and system costs. Ride quality is
determined by vehicle response and by environmental factors such as humidity
and noise. The dynamic response of vehicles is the key element in the
determination of ride quality, and vehicle stability is one of the important
elements relative to safety. To design a proper guideway that provides acceptable
ride quality in the stable region, the vehicle dynamics must be understood.
Furthermore, the trade-off between guideway smoothness and the levitation and
control systems must be considered if maglev systems are to be economically
feasible. The link between the guideway and other maglev components is vehicle
dynamics. For a commercial maglev system, vehicle dynamics must be analyzed
and tested in detail.
For safety, maglev systems should be stable. Magnetic forces are basically
position-dependent, although some are also velocity-dependent. These motion-
dependent magnetic forces can induce various types of instability. In addition,
the periodic structure of the motion-dependent magnetic forces may in some cases
also induce parametric and combination resonances.
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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/m1/5/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.