Nonlinear Stability of Rail Vehicles Traveling on Vibration-Attenuating Slab Tracks

2020 ◽  
Vol 15 (7) ◽  
Author(s):  
Liang Ling ◽  
Peibin Jiang ◽  
Kaiyun Wang ◽  
Wanming Zhai
Keyword(s):  
Limit Cycle ◽  
Nonlinear Stability ◽  
Critical Speed ◽  
Coupled Model ◽  
Ground Vibration ◽  
Vehicle Suspension ◽  
Lateral Stability ◽  
Hunting Behavior ◽  
Suspension Parameters ◽  
Rail Vehicles

Abstract Various vibration-attenuating slab tracks have been introduced into urban railways to minimize the negative effects of train-induced ground vibration and noise. However, compared with traditional slab tracks, vibration-attenuating slab tracks usually have a lower overall stiffness, which reduces the vehicle lateral stability. This paper presents an investigation of the nonlinear hunting stability of fast metro rail vehicles traveling on vibration-attenuating slab tracks. A three-dimensional vehicle–track coupled model considering different vibration-attenuating slab tracks is developed to investigate the nonlinear hunting behavior of metro vehicles running on different elastic vibration-attenuating tracks. The nonlinear critical speed and wheelset hunting limit cycle of two types of metro vehicles traveling on four typical types of vibration-attenuating tracks are compared in detail. The influences of vehicle–track system parameters, including rail fastener stiffness and vehicle suspension parameters, on the vehicle lateral nonlinear stability are reported. The results show that the flexibility of vibration-attenuating slab tracks leads to a large wheelset limit cycle and lowers the nonlinear critical speed. Increasing track lateral stiffness and designing appropriate vehicle suspension parameters can improve the lateral stability of rail vehicles traveling on vibration-attenuating slab tracks.

Stability of Elasto-Damper–Coupled Wheelset for High-Speed Rail Vehicles

1996 ◽  
Vol 1531 (1) ◽  
pp. 20-26
Author(s):  
Junghsen Lieh ◽  
Jie Yin
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
Vehicle Stability ◽  
Optimal Parameters ◽  
High Speed Rail ◽  
Stability Boundaries ◽  
Vehicle Performance ◽  
Suspension Parameters ◽  
Rail Vehicles ◽  
Stiffness And Damping

A symmetric wheelset with an elasto-damper coupling between the wheels is used to investigate the effect of coupling and primary stiffness and damping on the vehicle critical speed. Different suspension parameters are considered. Stability boundaries for various conditions are presented. The dynamic model of the elasto-damper–coupled wheelset is validated using published results. Both coupler and primary suspensions can dramatically affect the vehicle stability, and optimal parameters can be used to improve the vehicle performance over that of the conventional system.

Nonlinear Stability and Tracking of Rail Passenger Trucks

1982 ◽  
Vol 104 (3) ◽  
pp. 256-263 ◽  
Author(s):  
D. Horak ◽  
D. N. Wormley
Keyword(s):  
Critical Speed ◽  
Digital Simulation ◽  
Operating Conditions ◽  
Vehicle Suspension ◽  
Simulation Studies ◽  
Suspension Parameters ◽  
Significant Alignment ◽  
Power Spectral ◽  
Tracking Ability ◽  
Temporal Waveform

An analysis of a rail passenger truck which includes nonlinear wheel/rail geometry and creep forces is formulated for determining truck stability and response to rail alignment irregularities. Digital simulation studies using the analysis have illustrated the large amplitude flange to flange response which occurs in operation of a truck below critical speed on a track with significant alignment irregularity, of a truck near critical speed and excited by irregularities and of a truck operated above critical speed. The variations in temporal waveform, probability density, and power spectral density of vehicle motions for these conditions are described. The influence of vehicle suspension parameters and wheel/rail geometry on truck stability and tracking ability is discussed and related to operating conditions.

Metamodel-based robust collaborative optimization for the suspension parameters of rail vehicles

2019 ◽  
Vol 42 (8) ◽  
pp. 643-652
Author(s):  
Wenlong Liu ◽  
Yue Yang ◽  
Panpan Wang ◽  
Xiao Chen ◽  
Xiaobin Wei
Keyword(s):  
Collaborative Optimization ◽  
Suspension Parameters ◽  
Rail Vehicles

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.

Dynamic Analysis of Dry Frictional Disc Brake System Based on the Rigid-Flexible Coupled Model

2015 ◽  
Vol 07 (03) ◽  
pp. 1550044 ◽  
Author(s):  
Yini Zhao ◽  
Qian Ding
Keyword(s):  
Critical Speed ◽  
Plate Theory ◽  
Coupled Model ◽  
Exponential Model ◽  
Brake System ◽  
Disc Brake ◽  
Transverse Displacement ◽  
Stick Slip ◽  
Coupling Case ◽  
Frictional Disc

A rigid-flexible coupled dynamic model is established to investigate the dynamic behaviors of a disc brake system. The analytical model of the pad includes transverse and circumferential displacements. The disc is modeled using the thin plate theory. A governing equation of the motion of the disc is established. Then the first-order vibration equation is obtained using Galerkin method, considering only the transverse displacement. The friction between the pad and disk among the contacting area is estimated using an exponential model, in which the Stribeck effect is included. Numerical method is applied to reveal the influences of coupling dynamical relationships between the pad and disc on the whole system. The results show that with the variation of disc annular speed, the pad keeps vibrating with small amplitude due to the sustaining variation of the contacting pressure and friction. Stick-slip flutter happens as the velocity is lower than a critical speed and strong movement coupling between elements of the system brings earlier occurrence of the frictional flutter. Besides, for strong movement coupling case, before the critical speed, there are intermittent frequency ranges among which the amplitude is quite higher, which is due to a redistribution of friction and contacting pressure.

Lateral Stability Behavior of Railway Freight Car System With Elasto-Damper Coupled Wheelset: Part 2—Truck Model

1987 ◽  
Vol 109 (4) ◽  
pp. 500-507 ◽  
Author(s):  
A. K. W. Ahmed ◽  
S. Sankar
Keyword(s):  
Critical Speed ◽  
Lateral Stability ◽  
Stability Behavior ◽  
Railway Freight ◽  
Linearized Stability ◽  
Freight Car ◽  
Lateral Mode ◽  
Lateral Modes ◽  
The Stability ◽  
Railway Freight Car

To investigate the effect of elasto-damper coupled wheelset (EDCW), on the lateral stability behavior of freight cars, a railway freight truck model with two EDCW and pseudo-car body has been developed. The results of linearized stability analysis showed, that for small values of wheelset coupler stiffness, damping has significant influence on the stability behavior of wheelset relative spin as well as wheelset and truck lateral modes. The results further showed that, by utilizing an optimal EDCW coupler parameter, the critical speeds corresponding to truck hunting and wheelset lateral mode can be made equal. In doing so, the truck hunting critical speed on tangent track can be improved by over 100 percent in comparison to truck model with conventional rigid axle wheelsets.

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