Influence of Vehicle and Distributed Guideway Parameters on High Speed Vehicle-Guideway Dynamic Interactions

Abstract

Modal analysis techniques are used to study the dynamic interactions between a one-dimensional high speed ground transport vehicle model and a guideway consisting of multiple independent spans resting freely on rigid discrete supports. The study includes an evaluation of the effects of variations in the fundamental vehicle and guideway parameters on span maximum dynamic deflections and vehicle heave accelerations. Results of the study indicate that vehicle-guideway dynamic interactions strongly influence both vehicle suspension and guideway span design. For the range of parameters of interest in high speed systems (200–300 mph), guideway span dynamic to static deflection and stress ratios, or impact factors, may approach values of 2.0 for a single vehicle passage, and vehicle heave accelerations may exceed the levels of 0.05g desired for good ride quality unless very strong constraints are placed upon vehicle suspension requirements and guideway stiffness, weight, and span length specifications. System design guidelines are presented in the form of parametric plots in which the values of vehicle and guideway parameters required to limit maximum vehicle heave accelerations and guideway dynamic deflections are specified.

Vehicle/guideway interaction in maglev systems

“…The results of that research and development are useful in providing appropriate criteria for the design of maglev systems (Bohn and Steinmetz 1985;Chiu et al 1971;Iguchi and Hara 1985;Katz et al 1974;Sinha 1987). More emphasis should be placed on guideway design, because the cost of the guideway structure is expected to be =60-80% of the initial capital (Uher 1989;Zicha 1986).…”

“…An optimized design for guideways will be important for a high-speed maglev system with good ride quality. As vehicle speeds of maglev systems increase to 200-300 mi/hr, or as guideways become lighter and more flexible to reduce costs, the dynamic interactions between vehicles and guideways become an important problem and will play a dominant role in establishing vehicle suspension requirements and specifications for guideway stiffness, weight, and span length (Chiu et al 1971;Zicha 1986). …”

Dynamics and controls in maglev systems

“…14 and 15), the traverse speed of this forcing function, and the beam properties. For maglev systems, the number of modes is related to vehicle speed or crossing frequency (Cai et al 1992a;Chiu et al 1971;Richardson and Wormley 1974). Five modes are sufficient for maglev guideways with vehicle speeds under 500 km/hr, in accordance with calculated results (Cai et al 1992a).…”

“…The results of these efforts are useful in providing appropriate criteria for the design of maglev systems (Bohn and Steinmetz 1985;Chiu et al 1971;Iguchi and Hara 1985;Katz et al 1974;Sinha 1987).…”

“…An optimized guideway design will be important for a high-speed maglev system that offers good ride quality. As maglev vehicle speeds increase to 200-300 mi/hr, or as guideways become lighter and more flexible to reduce costs, the dynamic interactions between vehicle and guideway become an important problem and will play a dominant role in establishing vehicle suspension requirements and specifications for guideway stiffness, weight, and span length (Cai et al 1992a(Cai et al , 1992cChiu et al 1971;VuQuoc and Olsson 1989;Zicha 1986). …”