Real-Time Estimation of Arterial Travel Times with Spatial Travel Time Covariance Relationships

2009 ◽  
Vol 2121 (1) ◽  
pp. 102-109 ◽  
Author(s):  
K. S. Chan ◽  
William H. K. Lam ◽  
Mei Lam Tam
Keyword(s):  
Travel Time ◽  
Real Time ◽  
Time Estimation ◽  
Travel Times ◽  
Real Time Estimation

scholarly journals Highway travel time information system based on cumulative count curves and new tracking technologies

2016 ◽  
Author(s):  
Margarita Martínez-Díaz ◽  
Francesc Soriguera Martí ◽  
Ignacio Pérez Pérez
Keyword(s):  
Travel Time ◽  
Real Time ◽  
New Technologies ◽  
Time Estimation ◽  
Travel Times ◽  
Important Indicator ◽  
Loop Detectors ◽  
Real Time Estimation ◽  
Cumulative Count ◽  
Time Information

Travel time is probably the most important indicator of the level of service of a highway, and it is also the most appreciated information for its users. Administrations and private companies make increasing efforts to improve its real time estimation. The appearance of new technologies makes the precise measurement of travel times easier than never before. However, direct measurements of travel time are, by nature, outdated in real time, and lack of the desired forecasting capabilities. This paper introduces a new methodology to improve the real time estimation of travel times by using the equipment usually present in most highways, i.e., loop detectors, in combination with Automatic Vehicle Identification or Tracking Technologies. One of the most important features of the method is the usage of cumulative counts at detectors as an input, avoiding the drawbacks of common spot-speed methodologies. Cumulative count curves have great potential for freeway travel time information systems, as they provide spatial measurements and thus allow the calculation of instantaneous travel times. In addition, they exhibit predictive capabilities. Nevertheless, they have not been used extensively mainly because of the error introduced by the accumulation of the detector drift. The proposed methodology solves this problem by correcting the deviations using direct travel time measurements. The method results highly beneficial for its accuracy as well as for its low implementation cost.DOI: http://dx.doi.org/10.4995/CIT2016.2016.3209 

Real-Time Estimation of Travel Times on Inter-Urban Motorways

1997 ◽  
Vol 30 (8) ◽  
pp. 1121-1126
Author(s):  
Jean-Marc Morin ◽  
Raymond. Fevre
Keyword(s):  
Real Time ◽  
Time Estimation ◽  
Travel Times ◽  
Real Time Estimation

Real-time estimation of arterial travel time under congested conditions

2012 ◽  
Vol 8 (2) ◽  
pp. 87-104 ◽  
Author(s):  
Henry X. Liu ◽  
Wenteng Ma ◽  
Xinkai Wu ◽  
Heng Hu
Keyword(s):  
Travel Time ◽  
Real Time ◽  
Time Estimation ◽  
Real Time Estimation

Toward Understanding and Reducing Errors in Real-Time Estimation of Travel Times

2008 ◽  
Vol 2049 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Sirisha M. Kothuri ◽  
Kristin A. Tufte ◽  
Enas Fayed ◽  
Robert L. Bertini
Keyword(s):  
Real Time ◽  
Time Estimation ◽  
Travel Times ◽  
Real Time Estimation

Real-time estimation of freeway travel time with recurrent congestion based on sparse detector data

2018 ◽  
Vol 12 (1) ◽  
pp. 2-11 ◽  
Author(s):  
Lili Lu ◽  
Jian Wang ◽  
Zhengbing He ◽  
Ching-Yao Chan
Keyword(s):  
Travel Time ◽  
Real Time ◽  
Time Estimation ◽  
Real Time Estimation

A machine for real-time estimation of the tribological characteristics of materials

2020 ◽  
Vol 86 (4) ◽  
pp. 61-65
Author(s):  
M. V. Abramchuk ◽  
R. V. Pechenko ◽  
K. A. Nuzhdin ◽  
V. M. Musalimov
Keyword(s):  
Real Time ◽  
Time Estimation ◽  
Tribological Characteristics ◽  
Continuous Processing ◽  
Friction Machine ◽  
Dynamic Friction Coefficient ◽  
Displacement Sensors ◽  
Frictional Interaction ◽  
Real Time Estimation ◽  
Automated Quality Control

A reciprocating friction machine Tribal-T intended for automated quality control of the rubbing surfaces of tribopairs is described. The distinctive feature of the machine consists in implementation of the forced relative motion due to the frictional interaction of the rubbing surfaces fixed on the drive and conjugate platforms. Continuous processing of the signals from displacement sensors is carried out under conditions of continuous recording of mutual displacements of loaded tribopairs using classical approaches of the theory of automatic control to identify the tribological characteristics. The machine provides consistent visual real time monitoring of the parameters. The MATLAB based computer technologies are actively used in data processing. The calculated tribological characteristics of materials, i.e., the dynamic friction coefficient, damping coefficient and measure of the surface roughness, are presented. The tests revealed that a Tribal-T reciprocating friction machine is effective for real-time study of the aforementioned tribological characteristics of materials and can be used for monitoring of the condition of tribo-nodes of machines and mechanisms.

Onboard Real-time Estimation of Mean Orbital Elements with Atmospheric Drag

2013 ◽  
Vol 39 (10) ◽  
pp. 1722
Author(s):  
Zhao-Wei SUN ◽  
Wei-Chao ZHONG ◽  
Shi-Jie ZHANG ◽  
Jian ZHANG
Keyword(s):  
Real Time ◽  
Time Estimation ◽  
Atmospheric Drag ◽  
Orbital Elements ◽  
Real Time Estimation
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