Preliminary dynamic analysis of System 21 guideway and vehicle interaction

Technical Report · Sun Oct 01 04:00:00 EDT 1989

OSTI ID:720728

Lissaman, P B.S.; Hibbs, B D; Lindberg, D T ^[1]

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1. AeroVironment, Inc., Monrovia, CA (USA)

For System 21 the vehicles are supported by an eccentric connection to an elevated guideway. It is important to determine the dynamics of this system to evaluate the guideway structural loads, as well as the performance of the suspension and the ride quality. Two different mathematical models were developed to handle this. The first was an exact analytical solution for a simplified case of uniform steel beam and constant load and speed without eccentricity. The second was a Finite Difference Model (FDM) in which the detailed structure of the geometry can be treated and the solution obtained by integrating the acceleration with respect to time and distance. Vertical motions due to flexural and torsional deflections of the guideway were treated; lateral degrees of freedom were not considered. A third mathematical approach was outlined in which the best features of each of the previous models were combined. The FDM was checked from the exact results and it was determined that acceptable accuracy could be obtained by dividing the span into 40 segments and integrating with about 1000 time steps per segment. This involves a computational time of about one hour for each case. It is recommended that the model be used to refine the design, particularly the suspension dynamics and the pre-camber shape, that consideration be given to reducing the guideway structure and that immediate steps be taken to evaluate the system dynamics to handle lateral degrees of freedom. 2 refs., 10 figs., 1 tab.

• Research Organization: Futrex, Inc., Fairfax, VA (United States); AeroVironment, Inc., Monrovia, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FG01-89CE15439
• OSTI ID: 720728
• Report Number(s): DOE/CE/15439--T4; AV-R--89/7014; ON: TI90021204
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
99 GENERAL AND MISCELLANEOUS
ACCELERATION
ACCURACY
COMPUTERIZED SIMULATION
DYNAMICS
EVALUATION
F CODES
FINITE DIFFERENCE METHOD
FLEXIBILITY
FOURIER ANALYSIS
MASS TRANSIT SYSTEMS
MATHEMATICAL MODELS
PERFORMANCE
RAILWAYS
RANDOMNESS
RECOMMENDATIONS
RESPONSE FUNCTIONS
STRENGTH FUNCTIONS
STRUCTURAL MODELS
VELOCITY