scholarly journals The hierarchical real-time control of high speed trains for automatic train operation

2014 ◽  
Author(s):  
Q. Y. Wang
Keyword(s):  
Real Time ◽  
High Speed ◽  
Real Time Control ◽  
Time Control ◽  
High Speed Trains ◽  
Train Operation ◽  
Automatic Train Operation

A real-time control method-based simulation for high-speed trains on large-scale rail network

2017 ◽  
Vol 28 (10) ◽  
pp. 1750126 ◽  
Author(s):  
Yutong Liu ◽  
Chengxuan Cao ◽  
Yaling Zhou ◽  
Ziyan Feng
Keyword(s):  
Real Time ◽  
Traffic Flow ◽  
High Speed ◽  
Large Scale ◽  
Simulation Method ◽  
Real Time Control ◽  
Rail Network ◽  
Time Control ◽  
High Speed Trains ◽  
Rail Traffic

In this paper, an improved real-time control model based on the discrete-time method is constructed to control and simulate the movement of high-speed trains on large-scale rail network. The constraints of acceleration and deceleration are introduced in this model, and a more reasonable definition of the minimal headway is also presented. Considering the complicated rail traffic environment in practice, we propose a set of sound operational strategies to excellently control traffic flow on rail network under various conditions. Several simulation experiments with different parameter combinations are conducted to verify the effectiveness of the control simulation method. The experimental results are similar to realistic environment and some characteristics of rail traffic flow are also investigated, especially the impact of stochastic disturbances and the minimal headway on the rail traffic flow on large-scale rail network, which can better assist dispatchers in analysis and decision-making. Meanwhile, experimental results also demonstrate that the proposed control simulation method can be in real-time control of traffic flow for high-speed trains not only on the simple rail line, but also on the complicated large-scale network such as China’s high-speed rail network and serve as a tool of simulating the traffic flow on large-scale rail network to study the characteristics of rail traffic flow.

scholarly journals Observer Based Traction/Braking Control Design for High Speed Trains Considering Adhesion Nonlinearity

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Wenchuan Cai ◽  
Wenhao Liao ◽  
Danyong Li ◽  
Yongduan Song
Keyword(s):  
High Speed ◽  
Adhesion Force ◽  
Surface Condition ◽  
Control Design ◽  
Work Force ◽  
High Speed Trains ◽  
Train Operation ◽  
Braking Control ◽  
Key Enabling Technologies ◽  
Automatic Train Operation

Train traction/braking control, one of the key enabling technologies for automatic train operation, literally takes its action through adhesion force. However, adhesion coefficient of high speed train (HST) is uncertain in general because it varies with wheel-rail surface condition and running speed; thus, it is extremely difficult to be measured, which makes traction/braking control design and implementation of HSTs greatly challenging. In this work, force observers are applied to estimate the adhesion force or/and the resistance, based on which simple traction/braking control schemes are established under the consideration of actual wheel-rail adhesion condition. It is shown that the proposed controllers have simple structure and can be easily implemented from real applications. Numerical simulation also validates the effectiveness of the proposed control scheme.

Design of Process Controller Based on PCI Interface and CPLD Technology

2012 ◽  
Vol 614-615 ◽  
pp. 1562-1565
Author(s):  
Yu Sen Li ◽  
Ying Sun
Keyword(s):  
Real Time ◽  
High Speed ◽  
Low Cost ◽  
Pulse Signal ◽  
Pci Bus ◽  
Signal Acquisition ◽  
Real Time Control ◽  
Time Control ◽  
Interface Chip ◽  
Design Ideas

In order to realize the sensor signal acquisition and analysis of data, according to data acquisition system design ideas of the PCI bus, applying to CPLD complex programmable controller and CH365 interface chip and combined with the actual needs of data collection ,designed a kind of low cost, high speed process controller. CPLD realizes data cache control and the control of reading. This design can gather 16 roads analog signals and real-time pulse signal of 8 roads on the same time, which includes a 16-bit digital output channel and a 32-bit counter, could be used in the real-time control.

Intraoperative cervical epidurography: a simple modality for assessing the adequacy of decompression during anterior cervical procedures

2003 ◽  
Vol 98 (1) ◽  
pp. 96-99 ◽  
Author(s):  
Nedal Hejazi ◽  
Alfred Witzmann ◽  
Werner Hassler
Keyword(s):  
Real Time ◽  
High Speed ◽  
Low Cost ◽  
Cord Compression ◽  
Real Time Control ◽  
Immediate Feedback ◽  
Content Type ◽  
Bone Removal ◽  
Time Control ◽  
Fine Print

Object. Intraoperative cervical epidurography (ICE) was used during anterior cervical procedures to assess the success of bone resection and indicate the need for immediate correction in the event of inadequate decompression. Methods. The adequacy of decompression was assessed by the operating neurosurgeon who performed ICE after anterior microdiscectomy with exposure of the dura mater. If the decompression was deemed inadequate, additional bone was removed using a high-speed drill. Epidurography was conducted after each subsequent decompression until adequate bone removal was achieved. This was undertaken in 39 patients undergoing anterior cervical procedures. Nine patients underwent corpectomy, 21 one-level, and nine two-level discectomy. The ICE revealed insufficient resections requiring additional bone removal in 14 (36%) of the 39 patients. Conclusions. The goal of ICE is to ensure adequate decompression, and if such has not been achieved, to allow for additional immediate bone excision. Furthermore, ICE provides additional real-time control of the position of cages and screws to avoid dural tear or spinal cord compression. Because of this immediate feedback, the success rate of anterior cervical procedures can be improved. The advantages of this modality include real-time assessment, low cost, simplicity, and speed.

HIGH-PERFORMANCE MULTI-BODY COLLISION DETECTION FOR THE REAL-TIME CONTROL OF A CTS SYSTEM

2005 ◽  
Vol 29 (2) ◽  
pp. 163-177
Author(s):  
M. Ahmadi ◽  
M. Jaber ◽  
F.C. Tang
Keyword(s):  
Real Time ◽  
Collision Detection ◽  
High Speed ◽  
High Performance ◽  
Robot Manipulator ◽  
Real Time Control ◽  
The Real ◽  
Time Control ◽  
Multi Body ◽  
Joint Velocity

This paper presents a high performance methodology for the real-time implementation of collision detection on a Captive Trajectory Simulation (CTS) system. The CTS system includes a slow-moving redundant robot manipulator operating inside a wind tunnel environment with transonic conditions. Collisions can occur between robot links or the links and other objects present in the environment. A multi-body dynamic pruning method is proposed based on joint velocity bounds, which can significantly reduce the number of required collision checks without compromising the system’s safety due to its conservative assumptions. A balance is achieved between the accuracy and the speed of computations via the convex subhull subdivision of the objects, which reduces the geometrical details to further decrease the load of computations. Combining the above two strategies results in smaller and more consistent sample times allowing the collision detection to run in real-time as an integral part of a robot with a high speed control loop.

Robot Objective Parallel Calculation and Real-time Control Using a Digital Signal Processor

1998 ◽  
Vol 10 (6) ◽  
pp. 505-514
Author(s):  
Yoshiyuki Sankai ◽  
◽  
Tetsuya Nii ◽  
Shinichi Kariya
Keyword(s):  
Real Time ◽  
Parallel Computation ◽  
Digital Signal Processor ◽  
High Speed ◽  
Control Method ◽  
Digital Signal ◽  
Real Time Control ◽  
Parallel Calculation ◽  
Time Control ◽  
Signal Processor

We propose an objective parallel computation/control method, developing the following to solve conventional problems and installing a controller on a robot with links decomposed to objects: 1) parallel calculation for twodimensional link dynamics, 2) downsizing of a high-speed controller using a digital signal processor (DSP), 3) a common robot control library, and 4) parallel calculation control of a multilink system. Evaluating parallel computation/control using the DSP, we verified fine compact controller efficiency in real-time control of multi-DOF systems and control performance comparing overall system control by linear quadratic optimal control.

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