An Active Suspension System Design for the Lateral Dynamics of a High-Speed Wheel-Rail System

1971 ◽  
Vol 93 (4) ◽  
pp. 233-241 ◽  
Author(s):  
G. N. Sarma ◽  
F. Kozin
Keyword(s):  
High Speed ◽  
Optimization Problem ◽  
Active Suspension ◽  
Analog Computer ◽  
Suspension System ◽  
High Speed Rail ◽  
Lateral Dynamics ◽  
High Speeds ◽  
Quadratic Cost ◽  
Quadratic Cost Function

Railroad cars are known to exhibit instabilities in the lateral dynamics at high speeds. To solve some of the problems of stability, an active suspension system is studied for the high-speed rail vehicle and is compared with the passive system. The vehicle control problem is formulated as an optimization problem with an integral quadratic cost function, and the feedback law thus obtained is further simplified. For the case of the truck dynamics, with external controllers, a Lyapunov function approach is taken for considering state constraints. Stability regions are obtained by analog computer simulation.

Optimal control of an active suspension system employing high speed ON/OFF solenoid valve

1997 ◽  
Vol 4 (2) ◽  
pp. 137-140 ◽  
Author(s):  
Shaojun Liu ◽  
Jue Zhong ◽  
Qingchun Li ◽  
Hironao Yamada ◽  
Yoshikazu Suematsu
Keyword(s):  
Optimal Control ◽  
High Speed ◽  
Active Suspension ◽  
Solenoid Valve ◽  
Suspension System

Динамическая коррекция чувствительности дефектоскопических каналов при высокоскоростном контроле рельсов

2021 ◽  
pp. 3-14
Author(s):  
А.А. Марков ◽  
Е.А. Максимова ◽  
А.Г. Антипов
Keyword(s):  
High Speed ◽  
Scanning Speed ◽  
Technical Documentation ◽  
Dynamic Adjustment ◽  
Current Sensitivity ◽  
High Speed Rail ◽  
Quality Of Control ◽  
High Speeds ◽  
Standard Design ◽  
Scanning Path

The article is aimed at increasing the reliability of high-speed ultrasonic monitoring of long-dimensional objects, in particular, railway rails. The technical documentation for the control does not take into account the features of high-speed rail monitoring, is focused on compliance with the initially set parameters and cannot provide the required reliability of defect detection. The factors that manifest themselves at high scanning speeds and negatively affect the quality of control are considered. Most of these factors cannot be quantified and accounted for in order to adjust the control parameters. An estimate of the number of undetected defects was made when working according to current documents. To ensure reliable control at high speeds, it is proposed to evaluate the current sensitivity of the control using signals from standard design reflectors of the controlled object. As such reflectors, when monitoring rails, it is proposed to use standard holes in the area of bolted joints that are regularly encountered along the scanning path. An expression is obtained for determining the value of the correction of the control sensitivity depending on the scanning speed and the measured size of the signals from the holes. An algorithm for dynamic adjustment of the parameters (sensitivity) of the control is proposed, which increases the reliability of detecting defects in high-speed scanning conditions.

Magnetorheological Semi-Active Suspension to Improve High Speed Railway Vehicles Performance

2012 ◽  
Author(s):  
Dan Baiasu ◽  
Gheorghe Ghita ◽  
Ioan Sebesan
Keyword(s):  
High Speed ◽  
Degrees Of Freedom ◽  
Active Suspension ◽  
Railway Vehicle ◽  
Lateral Dynamics ◽  
Multibody Model ◽  
Logic Control ◽  
Secondary Suspension ◽  
Magneto Rheological ◽  
The Mathematical Model

The paper presents the opportunity of using a magneto-rheological damper to control the lateral oscillations of a passenger railway vehicle to increase its comfort and speed features. The lateral dynamics of the vehicle is simulated using a multibody model with 17 degrees of freedom considering the lateral, yawing and rolling oscillations. The equations describing the model are integrated by the authors using original software. The mathematical model considers the geometrical nonlinearities of the wheel-track contact. The nonlinear stability of the vehicle running on tangent tracks with irregularities is assessed and it is shown the influence of the construction parameters of the suspensions on the vehicle’s performance. A magneto-rheological device with sequential damping based on balance logic control strategy is introduced in the secondary suspension of the vehicle to reduce the lateral accelerations generated by the track’s irregularities. The system’s response in terms of accelerations is compared for both passive and semi-active cases. It is shown that the magneto-rheological semi-active suspension improves the safety and the comfort of the railway vehicle.

The Effect of Delayed Feedback Control on Lateral Semi-Active Suspension System for High-Speed Train

2013 ◽  
Vol 753-755 ◽  
pp. 1795-1799 ◽  
Author(s):  
Xiao Wei Huang ◽  
Yan Ying Zhao
Keyword(s):  
Time Delay ◽  
Feedback Control ◽  
High Speed ◽  
Active Suspension ◽  
Suspension System ◽  
Delayed Feedback Control ◽  
Lateral Vibration ◽  
High Speed Train ◽  
Passive Suspension ◽  
Passive Suspension System

In order to suppress the lateral vibration of high-speed train caused by track irregularity, the delayed feedback control is employed to suppress the vibration of the semi-active suspension system. The 1/4 vehicle mathematical model of semi-active suspension system is established. The amplitude of the bodys lateral vibration is large at some values of external excitation frequency for the passive suspension system, and it could be suppressed at some values of time delay, while the vibration of the bodys lateral vibration may be deteriorated at other values of time delay. The results show that the amplitude of the bodys lateral vibration could be suppressed about 50% when the suitable values of damping coefficient and time delay are chosen by comparing with the passive suspension system. The analytical results of this paper are in good agreement with the numerical simulation.

Robust quadratic finite-horizon optimal controllers design of uncertain active suspension systems

2009 ◽  
Vol 223 (7) ◽  
pp. 941-955
Author(s):  
S-H Chen ◽  
W-H Ho ◽  
J-H Chou ◽  
S-K Lin
Keyword(s):  
Optimal Control ◽  
Constrained Optimization ◽  
Optimization Problem ◽  
Control Design ◽  
Active Suspension ◽  
Suspension System ◽  
Finite Horizon ◽  
Constrained Optimization Problem ◽  
Optimal Controllers ◽  
Quadratic Optimal Control

By integrating the robust stabilizability condition, the orthogonal functions approach (OFA), and the hybrid Taguchi-genetic algorithm (HTGA), an integrative method is presented in this paper to design a robust-stable and quadratic optimal controller such that (a) the active suspension system with elemental parametric uncertainties can be robustly stabilized, and (b) a quadratic finite-horizon integral performance index for the nominal active suspension system can be minimized. In this paper, the robust stabilizability condition is proposed in terms of linear matrix inequalities (LMIs). Based on the OFA, an algebraic algorithm involving only algebraic computation is derived in this paper for solving the nominal active suspension feedback dynamic equations. By using the OFA and the LMI-based robust stabilizability condition, the dynamic optimization problem for the robust-stable and quadratic optimal control design of the linear uncertain active suspension system is transformed into a static-constrained optimization problem represented by algebraic equations with the constraint of the LMI-based robust stabilizability condition; thus greatly simplifying the robust-stable and quadratic optimal control design problem of the linear uncertain active suspension system. Then, for the static-constrained optimization problem, the HTGA is employed to find the robust-stable and quadratic optimal controllers of the linear uncertain active suspension system. A design example is given to demonstrate the applicability of the proposed integrative approach.

Design and Development of Smart Semi Active Suspension for Nonlinear Rail Vehicle Vibration Reduction

2020 ◽  
Vol 20 (11) ◽  
pp. 2050120
Author(s):  
Sunil Kumar Sharma ◽  
Jaesun Lee
Keyword(s):  
Predictive Model ◽  
High Speed ◽  
Mr Damper ◽  
Active Suspension ◽  
Creep Model ◽  
Ride Quality ◽  
High Speed Rail ◽  
Running Safety ◽  
Rail Vehicle ◽  
Fluid Dampers

In this paper, the semi-active suspension in railway vehicles based on the controlled magnetorheological (MR) fluid dampers is examined, and compared with the semi-active low and semi-active high suspension systems to enhance the running safety and ride quality for a high-speed rail vehicle. Predictive model controllers are used as system controllers to determine the desired damping forces for front and rear bogie frame with force track-ability. A 28 degree of freedom (DoF) mathematical model of the rail vehicle is formulated using nonlinear vehicle suspension and nonlinear heuristic creep model. The MR model of Ali and Ramaswamy is formulated to characterize the behavior of the MR damper. The simulation result is validated using the experimental results. Four different suspension strategies are proposed with MR damper, i.e. passive, semi-active low, semi-active high and semi-active smart controller based on predictive model controller. A comparison indicates that the semi-active controller gives the optimum for comfort vibration actuation and improves the ride quality and it has little influence on derailment quotients, offload factors, as a result, it will not endanger the running safety of rail vehicle.

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