Elimination of bouncing, weaving, pitching in high speed passenger transit systems

2021 ◽  
pp. 133-142
Author(s):  
E. Knolle
Keyword(s):  
High Speed ◽  
Transit Systems

scholarly journals Three Extensions of Tong and Richardson’s Algorithm for Finding the Optimal Path in Schedule-Based Railway Networks

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
J. Xie ◽  
S. C. Wong ◽  
S. M. Lo
Keyword(s):  
High Speed ◽  
Optimal Path ◽  
Low Frequency ◽  
Proper Treatment ◽  
High Speed Railway ◽  
Transit Systems ◽  
Transit Network ◽  
Transit Networks ◽  
Optimal Paths ◽  
Railway Networks

High-speed railways have been developing quickly in recent years and have become a main travel mode between cities in many countries, especially China. Studying passengers’ travel choices on high-speed railway networks can aid the design of efficient operations and schedule plans. The Tong and Richardson algorithm that is used in this model offers a promising method for finding the optimal path in a schedule-based transit network. However, three aspects of this algorithm limit its application to high-speed railway networks. First, these networks have more complicated common line problems than other transit networks. Without a proper treatment, the optimal paths cannot be found. Second, nonadditive fares are important factors in considering travel choices. Incorporating these factors increases the searching time; improvement in this area is desirable. Third, as high-speed railways have low-frequency running patterns, their passengers may prefer to wait at home or at the office instead of at the station. Thus, consideration of a waiting penalty is needed. This paper suggests three extensions to improve the treatments of these three aspects, and three examples are presented to illustrate the applications of these extensions. The improved algorithm can also be used for other transit systems.

Dynamic Analysis of the Vehicle Running on Turnout at High Speed Considering Longitudinal Variation of Rail Profiles

2005 ◽  
Author(s):  
Hiroyuki Kono ◽  
Yoshihiro Suda ◽  
Masahiro Yamaguchi ◽  
Hiroshi Yamashita ◽  
Yukihide Yanobu ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Light Rail ◽  
Longitudinal Variation ◽  
Transit Systems ◽  
Traffic Jam ◽  
Railway Systems ◽  
Body Dynamics ◽  
Multi Body ◽  
High Speed Railroad

Recently, railroad systems are getting increased worldwide attention in order to reduce environmental pollution and traffic jam. The railway systems are light rail transit systems in city or high-speed railroad systems between cities. Up to now, dynamic behavior of the vehicle running on a turnout at high speed was NOT researched. In this research, dynamic behavior of the vehicle running on turnout at high speed was calculated using A’GEM (Multi-Body Dynamics program), which was developed to enable to calculate the longitudinal variation of cross-section of rail profiles with vehicle running on turnout which has tongue rails and crossing rails. This paper shows the analysis method and the results of dynamic simulation of the vehicle running on a turnout at high speed considering longitudinal variation of rail profiles.

scholarly journals New High-Speed Rail System Proposed by August Scherl. Passenger Traffic Improvement Project

2021 ◽  
Vol 18 (4) ◽  
pp. 211-244
Author(s):  
Article Editorial
Keyword(s):  
System Integration ◽  
High Speed ◽  
Optimal Transport ◽  
Transport Modelling ◽  
High Speed Rail ◽  
Transit Systems ◽  
Improvement Project ◽  
Passenger Traffic ◽  
Personal Rapid Transit ◽  
Business Journal

We reproduce an article first published in 1910 that describes in detail engineering projects, that were not only being developed but widely discussed. Those projects were dedicated to development of rapid, and particularly high-speed transportation in Berlin. The developments of that time reflected broad engineering views. It seems to be an attempt to integrate into a single project all the promising ideas regarding technical advancements as well as optimal transport modelling, routing schemes, traffic organisation, urban spatial planning. The discussion touched upon radial and ring traffic system, integration of the urban transportation system into national and even global one, splitting of passenger and freight traffic and infrastructure, and engineering decisions have reminded about contemporary monorail, elevated railways, light metro, and even personal rapid transit systems… The article attracted attention in Germany, as well as in other countries, and was reproduced in Zheleznodorozhnoe Delo [Railway Business] journal. Probably, many described aspects besides historical ones might be of interest today as well.

scholarly journals Research on a Novel Locating Method for Track Inspection Based on Onboard Sensors in Maglev Train

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3236
Author(s):  
Yihong Yuan ◽  
Yanyun Luo ◽  
Feng Ye ◽  
Zhiwei Zhu ◽  
Guofeng Zeng ◽  
...  
Keyword(s):  
High Speed ◽  
Longitudinal Direction ◽  
Location Information ◽  
Area Network ◽  
Maglev Train ◽  
Transit Systems ◽  
Network Connection ◽  
The Time Domain ◽  
Inspection Data ◽  
Additional Hardware

Guideway inspection is of great significance to the operation safety and riding quality of a commercial high-speed maglev transportation system. When analyzing guideway inspection data, it is important to obtain the location information for each piece of raw data and convert it from the time domain to the spatial domain for the analysis afterward. Previous studies have used the method of adding additional hardware such as GPS (global positioning system) receivers, LRF (location reference flag) readers, or onboard CAN (controller area network) bus adaptors to obtain location information. This paper presents a novel method for indirectly obtaining the location information via the use of data from the levitation and guidance control sensors perpendicular to the longitudinal direction to extract the characteristic information from the track. The method can be used for a long stator linear motor-driven maglev system and similar contactless rail transit systems. The results showed that the method could accurately identify the required location information in each stator tooth during the entire operation simultaneously with the operating information such as train velocity, direction, and track ID, without additional hardware installation and vehicle network connection. Thus, it could improve the pertinence of the results of guideway inspection equipment, and at the same time, facilitate the miniaturization and independence of guideway inspection equipment.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

The on-line use of histogram data for high-speed correction and alignment of electron microscope images

1984 ◽  
Vol 42 ◽  
pp. 556-557
Author(s):  
William Krakow
Keyword(s):  
Power Spectrum ◽  
High Speed ◽  
Direct Memory Access ◽  
Digital Television ◽  
Contrast Transfer Function ◽  
The Past ◽  
High Resolution Tem ◽  
On Line ◽  
Correction Of Astigmatism ◽  
The Fourier Transform

In the past few years on-line digital television frame store devices coupled to computers have been employed to attempt to measure the microscope parameters of defocus and astigmatism. The ultimate goal of such tasks is to fully adjust the operating parameters of the microscope and obtain an optimum image for viewing in terms of its information content. The initial approach to this problem, for high resolution TEM imaging, was to obtain the power spectrum from the Fourier transform of an image, find the contrast transfer function oscillation maxima, and subsequently correct the image. This technique requires a fast computer, a direct memory access device and even an array processor to accomplish these tasks on limited size arrays in a few seconds per image. It is not clear that the power spectrum could be used for more than defocus correction since the correction of astigmatism is a formidable problem of pattern recognition.

Structural changes in silicon-on-insulator material during post-implantation annealing

1986 ◽  
Vol 44 ◽  
pp. 736-737
Author(s):  
C. O. Jung ◽  
S. J. Krause ◽  
S.R. Wilson
Keyword(s):  
Integrated Circuits ◽  
Oxide Layer ◽  
High Speed ◽  
Structural Changes ◽  
Device Fabrication ◽  
Silicon On Insulator ◽  
High Quality ◽  
Radiation Hardened ◽  
Post Implantation ◽  
Very High

Silicon-on-insulator (SOI) structures have excellent potential for future use in radiation hardened and high speed integrated circuits. For device fabrication in SOI material a high quality superficial Si layer above a buried oxide layer is required. Recently, Celler et al. reported that post-implantation annealing of oxygen implanted SOI at very high temperatures would eliminate virtually all defects and precipiates in the superficial Si layer. In this work we are reporting on the effect of three different post implantation annealing cycles on the structure of oxygen implanted SOI samples which were implanted under the same conditions.

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