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

1971 ◽  
Vol 93 (1) ◽  
pp. 25-34 ◽  
Author(s):  
W. S. Chiu ◽  
R. G. Smith ◽  
D. N. Wormley
Keyword(s):  
High Speed ◽  
Design Guidelines ◽  
Impact Factors ◽  
Ride Quality ◽  
Vehicle Suspension ◽  
Dynamic Interactions ◽  
Single Vehicle ◽  
Transport Vehicle ◽  
Stress Ratios ◽  
High Speed Vehicle

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.

Analysis, Design, and Optimization of High Speed Vehicle Suspensions Using State Variable Techniques

1974 ◽  
Vol 96 (2) ◽  
pp. 193-203 ◽  
Author(s):  
J. K. Hedrick ◽  
G. F. Billington ◽  
D. A. Dreesbach
Keyword(s):  
High Speed ◽  
Optimization Problems ◽  
Vertical Plane ◽  
Computer Application ◽  
Vehicle Suspension ◽  
State Variables ◽  
State Variable ◽  
Suspension Parameters ◽  
Suspension Model ◽  
High Speed Vehicle

This article applies state variable techniques to high speed vehicle suspension design. When a reasonably complex suspension model is treated, the greater adaptability of state variable techniques to digital computer application makes it more attractive than the commonly used integral transform method. A vehicle suspension model is developed, state variable techniques are applied, numerical methods are presented, and, finally, an optimization algorithm is chosen to select suspension parameters. A fairly complete bibliography is included in each of these areas. The state variable technique is illustrated in the solution of two suspension optimization problems. First, the vertical plane suspension of a high speed vehicle subject to guideway and aerodynamic inputs will be analyzed. The vehicle model, including primary and secondary suspension systems, and subject to both heave and pitch motions, has thirteen state variables. Second, the horizontal plane suspension of a high speed vehicle subject to guideway and lateral aerodynamic inputs is analyzed. This model also has thirteen state variables. The suspension parameters of both these models are optimized. Numerical results are presented for a representative vehicle, showing time response, mean square values, optimized suspension parameters, system eigenvalues, and acceleration spectral densities.

scholarly journals Impact of fractional order methods on optimized tilt control for rail vehicles

2017 ◽  
Vol 20 (3) ◽  
Author(s):  
Fazilah Hassan ◽  
Argyrios Zolotas
Keyword(s):  
Fractional Order ◽  
High Speed ◽  
Control Design ◽  
Ride Quality ◽  
Dynamic Interactions ◽  
High Speed Rail ◽  
Control Applications ◽  
Railway Systems ◽  
Methods Analytical ◽  
The Impact

AbstractAdvances in the use of fractional order calculus in control theory increasingly make their way into control applications such as in the process industry, electrical machines, mechatronics/robotics, albeit at a slower rate into control applications in automotive and railway systems. We present work on advances in high-speed rail vehicle tilt control design enabled by use of fractional order methods. Analytical problems in rail tilt control still exist especially on simplified tilt using non-precedent sensor information (rather than use of the more complex precedence (or preview) schemes). Challenges arise due to suspension dynamic interactions (due to strong coupling between roll and lateral dynamic modes) and the sensor measurement. We explore optimized PID-based non-precedent tilt control via both direct fractional-order PID design and via fractional-order based loop shaping that reduces effect of lags in the design model. The impact of fractional order design methods on tilt performance (track curve following vs ride quality) trade off is particularly emphasized. Simulation results illustrate superior benefit by utilizing fractional order-based tilt control design.

Dynamic Interactions of a High-Speed Vehicle and a Distributed Discretely Supported Guideway

2010 ◽  
Vol 26 (1) ◽  
pp. N9-N16
Author(s):  
C.-Y. Hu ◽  
K.-C. Chen ◽  
J.-S. Chen
Keyword(s):  
High Speed ◽  
Integration Method ◽  
Equations Of Motion ◽  
Dynamic Interactions ◽  
Coupled Equations ◽  
Steady State Responses ◽  
Loading Modes ◽  
Rigid Supports ◽  
State Responses ◽  
High Speed Vehicle

AbstractThis study investigates the dynamic interactions between a vehicle and guideway of a high-speed ground transportation system based on maglev vehicles. The guideway is assumed to be made up of identical simply supported beams with single spans and rigid supports. The vehicle is considered to a two-dimensional vehicle model with primary and secondary suspensions. Three kinds of loading modes acting at each beam of guideway are first developed according to the locations of suspensions of vehicle. Coupled equations of motion of both vehicle and guideway in various loading modes are derived and solved by using numerical integration method. The simulations have been performed to investigate the parameters of vehicle/guideway system which may affect the steady-state responses of the vehicle and guideway.

Dynamic Interaction of a Distributed Supported Guideway and a Asymmetrical Multimagnet Suspension Vehicle with Unbalanced Mass

2010 ◽  
Vol 26 (1) ◽  
pp. 1-14 ◽  
Author(s):  
C.-Y. Hu ◽  
K.-C. Chen ◽  
J.-S. Chen
Keyword(s):  
High Speed ◽  
Degrees Of Freedom ◽  
Design Guidelines ◽  
Beam Equation ◽  
Euler Beam ◽  
Dynamic Interactions ◽  
Vehicle Suspensions ◽  
Lumped Masses ◽  
Rigid Supports ◽  
Passenger Cabin

AbstractThis study investigates the steady state dynamic interactions between a vehicle and guideway of a high-speed ground transportation system based on magnetically levitated (Maglev) vehicles. The guideway is assumed to be made up of identical simply supported beams with single spans and rigid supports. The vehicle is considered two-dimensional, with numerous degrees of freedom representing the passenger cabin and primary and secondary suspensions of the vehicle with lumped masses, linear springs and dampings. The Bernoulli-Euler beam equation is utilized to model the characteristics of a flexible guideway, and the guideway synthesis is based on a modal analysis method. The dynamic behaviors of both vehicle and guideway are then simulated to investigate how the locations of the passenger cabin mass of center and asymmetric suspension characteristics of the vehicle suspensions influence high speed vehicle-guideway interaction. Finally, simulation results are compared. Results of this study provide basic design guidelines for Maglev vehicle-guideway systems.

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