Feedback Control of Brake System on Railway Vehicle Considering Non-Linear Property and Dead Time

2003 ◽  
Author(s):  
Masanobu Nankyo ◽  
Tadashi Ishihara ◽  
Hikaru Inooka
Keyword(s):  
High Speed ◽  
Dead Time ◽  
Control Method ◽  
Design Method ◽  
Control Device ◽  
Railway Vehicle ◽  
Non Linear ◽  
Train Operation ◽  
Linear Elements ◽  
Brake Force

Increase of deceleration in high-speed and high-density train operation degrades riding comfort and frequently causes wheel skids. This requires an introduction of the control engineering to upgrade the control performance of brake systems on rolling stocks. We are now studying a control method for mechanical brakes that uses friction and pneumatic pressure, including non-linear elements as the basis of brake force. Furthermore, the system itself has certain “dead time”, which is not ignorable and makes controlling difficult. One of our targets is to develop a brake control device that can control deceleration in accordance with a decelerating pattern that optimizes riding comfort and prevents wheel skids. In this paper, a design method of the controller for the deceleration tracking control and the system compensating the dead time are proposed. Finally, the effects of them are confirmed through computer simulations and experimental results.

Feedback Control of Braking Deceleration on Railway Vehicle

2005 ◽  
Vol 128 (2) ◽  
pp. 244-250 ◽  
Author(s):  
Masanobu Nankyo ◽  
Tadashi Ishihara ◽  
Hikaru Inooka
Keyword(s):  
Tracking Control ◽  
High Speed ◽  
Dead Time ◽  
Design Method ◽  
Control Device ◽  
Railway Vehicle ◽  
Control Technology ◽  
Control Methods ◽  
Control Performance ◽  
Brake Force

An increase of the deceleration in high-speed and high-density train operations degrades riding comfort and frequently causes wheel skids. This requires an introduction of the control technology to upgrade the control performance of brake systems on railway vehicles. We are now studying control methods for a mechanical brake that uses friction and pneumatic pressure, including nonlinear elements as the basis of a brake force. Furthermore, the system itself has certain “dead time,” which is not negligible and makes control difficult. One of our targets is to develop a brake control device that can control the deceleration in accordance with a decelerating pattern that optimizes the riding comfort of trains and prevents wheel skids. In this paper, a design method of the controller for the deceleration tracking control and the system compensating the dead time are proposed. Finally, the effects of them are confirmed through computer simulations and experimental results on a dynamo test stand.

scholarly journals Cooperative Control Method of Active and Semiactive Control: New Framework for Vibration Control

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Kazuhiko Hiramoto
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Cooperative Control ◽  
Control Method ◽  
Design Method ◽  
Control Object ◽  
Control Device ◽  
Semiactive Control ◽  
Control Input ◽  
Control Approach

A new control design framework for vibration control, the cooperative control of active and semiactive control, is proposed in the paper. In the cooperative control, a structural system having both of an actuator and a semiactive control device, for example, MR damper and so forth, is defined as the control object. In the proposed control approach, the higher control performance is aimed by the cooperative control between the active control with the actuator and the semiactive control with the semiactive control device. A design method to determine the active control input and the command signal to drive the semiactive control device based on the one-step prediction of the control output is proposed. A simulation example of a control system design for a benchmark building is presented to show the effectiveness of the proposed control framework.

A Study of Control Methods for the Braking System on Passenger Multiple Units

2004 ◽  
Author(s):  
Masanobu Nankyo
Keyword(s):  
Real Time ◽  
Control Method ◽  
Estimation Method ◽  
Time Estimation ◽  
Brake System ◽  
Friction Forces ◽  
Brake Shoe ◽  
Non Linear ◽  
Linear Elements ◽  
Real Time Estimation

As well known, the mechanical (friction, pneumatic) brake system on trains contains some non-linear elements. So it has been difficult to control the speed or acceleration of trains according to desired patterns. This paper reviews our research on the control method of the physical performance of train running such as acceleration (deceleration) by mechanical braking devices. One of our approaches is the introduction of the feedback control into the brake control system. Mathematical models of non-linear elements in the brake system and some effective methods of controller design are proposed with both simulation and experimental results. Another approach is the real time estimation of the friction forces between a brake shoe and a wheel tread. Friction has severe non-linearity; however it can not be measured easily on running trains. We propose the introduction of the onboard real-time estimation method of friction coefficients using the speed information which can be obtained easily in the existing brake system.

scholarly journals Digital Adaptive Hysteresis Current Control for Multi-Functional Inverters

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2422 ◽  
Author(s):  
Triet Nguyen-Van ◽  
Rikiya Abe ◽  
Kenji Tanaka
Keyword(s):  
High Speed ◽  
Power Flow ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Control Device ◽  
Current Control ◽  
Control Mode ◽  
Control Technique ◽  
Sampled Data ◽  
Hysteresis Current Control

This paper proposes a digital adaptive hysteresis current control method for multi-functional inverters in a power-flow control device called digital grid router. Each inverter can be controlled in master, grid-connected, or stand-alone modes, which can be specified by the controller. While the popular linear sine-triangle pulse width modulation (SPWM) control technique requires complicated proportional-integral (PI) regulators with an unavoidable time delay, hysteresis current control has a simple structure, fast responses, and robustness due to its independent system of parameters. Since the hysteresis current control method controls the output current stay around the reference current directly, in the multi-functional inverter, the reference output is not given by a current directly. Thus, the reference current used to implement the hysteresis current control in this study is calculated from the given reference voltage or power in each control mode. The controller uses high-speed sampled data at MHz level and is implemented by using a field-programmable gate array (FPGA). Experimental results show good performances of the proposed controller in controlling power exchanges in the digital grid router.

Review on Main Drive Torsional Vibration and Roller Coupling Vibration of Rolling Mill

2020 ◽  
Vol 14 ◽  
Author(s):  
Xiao-bin Fan ◽  
Bin Zhao ◽  
Yu Jiang ◽  
Bing-Xu Fan
Keyword(s):  
Rolling Mill ◽  
High Speed ◽  
Control Method ◽  
Hot Spot ◽  
Rolling Process ◽  
Coupling Vibration ◽  
Non Linear ◽  
Roll System ◽  
The Stability ◽  
Rolling Mill Vibration

Background: Rolling mill vibration has become one of the most widespread and unsolved problems in rolling industry, which is called "Ghost" vibration. The research on the starting mechanism, vibration characteristics and vibration suppression measures of high-speed tandem rolling mill has always been a hot spot and difficult point in the field of rolling at home and abroad. However, up to now, the research on rolling mill vibration has not formed a relatively complete and widely accepted theoretical system, experimental means and solutions. In production, vibration is often controlled by experience and test, which has high cost and low efficiency. Methods: In this paper, the research history and achievements of vibration phenomena, vibration mechanism, stability of rolling process and vibration control theory of high-speed tandem rolling mill in recent years are summarized. The aim is to reveal the mechanism of rolling mill vibration in continuous rolling process, the mechanism of rolling mill non-linear vibration instability and its changing law, and to explore the optimization of rolling process and the control method of rolling mill structure so as to improve the rolling process. Results: The evolution of non-linear random torsional / bending vibration and its transfer mechanism to the space coupling vibration of the roll system, the unsteady dynamic friction characteristics of the rolling interface and the mechanism of induced roll chatter, and the non-linear random dynamic behavior of the space coupling vibration of the roll system are revealed. Conclusion: The stability of rolling process can realize the research and development of high-end products considering the stability of rolling process, and also provide reference for further research by industry experts.

Research of Modern Railway Vehicle Structure Fatigue Design Method Based on Multibody Dynamic Simulation

2010 ◽  
Vol 118-120 ◽  
pp. 327-331 ◽  
Author(s):  
Bing Rong Miao ◽  
Wei Hua Zhang ◽  
L.M. Zhang ◽  
Tao Zhu ◽  
H.T. Yin
Keyword(s):  
High Speed ◽  
Optimization Problems ◽  
Design Method ◽  
Parallel Optimization ◽  
Railway Vehicle ◽  
Local Vibration ◽  
Integrated Method ◽  
Durability Analysis ◽  
Multibody Dynamic ◽  
Vehicle Structure

For high-speed railway carbody structure durability analysis problems in China, one integrated method based on MBS (multibody simulation) is proposed here. Firstly, one EMU (Electricity Multiple Unit) full vehicle was performed to dynamic modeling and simulation. The numerical simulation results were applied to illustrate the vehicle dynamic characteristics. And the relationships between structural strength, stiffness, and frequency characteristics were also studied. Secondly, the multidisciplinary design technique was used to solve multi-mode coupled vibration of carbody structure on the cumulative effects of local vibration and damage effects, as well as structure light-weighting and other parallel optimization problems. Finally, the effective measures were proposed to control carbody structure’s physical failure.

A Higher Casting and Jump Motions Realized by Robots Using Magnetic Brake Cylinder

2011 ◽  
Vol 3 (4) ◽  
Author(s):  
Eyri Watari ◽  
Hideyuki Tsukagoshi ◽  
Ato Kitagawa ◽  
Takahiro Tanaka
Keyword(s):  
High Speed ◽  
Control Method ◽  
Design Method ◽  
Simulation Method ◽  
Pneumatic Cylinder ◽  
Rescue Operation ◽  
Height Control ◽  
Jumping Robot ◽  
Impulsive Release ◽  
High Condition

A casting motion or a jumping motion can enhance the traverse ability and agility simultaneously of a mobile robot. This paper describes the development of a novel actuator, based on a pneumatic driving unit, which enables the generation of high-speed motion necessary to realize the motions mentioned above. The proposed actuator, named Magnetic Brake (MB) Cylinder, is composed of a pneumatic cylinder, a permanent magnet, a portable tank, and small valves. The speed of conventional pneumatic cylinders highly depends on the size of the valve which drives it. Since the magnet plays a role to enhance the impulsive release function of pneumatic energy instead of using a big and heavy valve, the pressure inside the cylinder can be kept in high condition, enabling the generation of high velocity with light structure. The height control method of casted objects with the MB Cylinder and its design method are also described in this paper. The analysis of the performance of the MB Cylinder and its simulation method are described for when using the MB Cylinder for both casting motion and jumping motion. After the developed unit is installed on both the casting device and the jumping robot, the validity of the proposed methods is experimentally verified in addition to discussion on its application to rescue operation.

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