Traction Motor Experience on Toronto Subway

1981 ◽  
Vol 195 (1) ◽  
pp. 347-356 ◽  
Author(s):  
W G Jowett
Keyword(s):  
Test Bed ◽  
Traction Motor ◽  
Traction Motors ◽  
Motor Experience ◽  
History Of

The paper gives a brief history of the Toronto Subway and how a British company became involved in the supply of prototype traction motors to the Toronto Transit Commission (TTC) followed in 1971 by the supply of motors for the H2 stock. On the test bed these motors were shown to be up to specification with reasonable margins on rating and commutation, but after varying periods in service, problems arose which were dealt with and overcome effectively except for one problem connected with commutator face erosion, which became known as the TIR problem'2, the cause of which proved to be most elusive. The main content of the paper concerns the search for the cause and a solution to this problem. In 1973, TTC called for tenders for further subwaycars (the H4 stock). At this stage, causes and solutions to the TIR problem had been suggested and interim results were promising. However, after negotiating special guarantees, eventually an order was received for H4 stock motors which incorporated improvements and the suggested remedies to the ‘TIR problem’. These motors have now satisfactorily completed over 400 000 miles in service showing that the solutions applied were sound and effective and it is now estimated that the period between commutator skimming will be 500 000 miles or over.

scholarly journals The International 
General Game Playing Competition

AI Magazine ◽  
2013 ◽  
Vol 34 (2) ◽  
pp. 107 ◽  
Author(s):  
Michael Genesereth ◽  
Yngvi Björnsson
Keyword(s):  
Artificial Intelligence ◽  
Problem Solving ◽  
General Problem ◽  
Game Playing ◽  
Test Bed ◽  
General Game Playing ◽  
Research Challenges ◽  
History Of ◽  
World Class ◽  
General Game

Games have played a prominent role as a test-bed for advancements in the field of Artificial Intelligence ever since its foundation over half a century ago, resulting in highly specialized world-class game-playing systems being developed for various games. The establishment of the International General Game Playing Competition in 2005, however, resulted in a renewed interest in more general problem solving approaches to game playing. In general game playing (GGP) the goal is to create game-playing systems that autonomously learn how to skillfully play a wide variety of games, given only the descriptions of the game rules. In this paper we review the history of the competition, discuss progress made so far, and list outstanding research challenges.

Analysis and Calculation of Electromagnetic Torque for the Voltage Source Traction Motors

2013 ◽  
Vol 446-447 ◽  
pp. 672-677
Author(s):  
Xiao Yu Wu ◽  
Zhe Ming Chen ◽  
Ze Hao Huang
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Voltage Source ◽  
Electromagnetic Torque ◽  
Motor Speed ◽  
Traction Motor ◽  
Traction Motors ◽  
Vehicle System ◽  
Mathematical Formulas ◽  
The Time Domain

The traction motor installed on the high-speed train is powered by inverter. A large number of harmonics may appear when motor is operating. Then the motor speed generate oscillation and finally the dynamic characteristic is affected in vehicle system. In this paper, relied on the electromagnetism of traction motor, the mechanism about emerging harmonic torque is analyzed. In addition, based on the equivalent circuit, the method of calculating the parameters in harmonic circuit is proposed. Two mathematical formulas are also proposed to obtain the fundamental electromagnetic torque and the harmonic electromagnetic torque on traction motor. The time domain and frequency domain distributions of the torques are gained and analyzed. Finally a calculation example of traction motor harmonic torque was analyzed and calculated, and prepared for further study of harmonic torque impacting on vehicle system dynamic performance.

scholarly journals Metallicity studies of the Galactic center: evidence for a top-heavy star formation history?

2013 ◽  
Vol 9 (S303) ◽  
pp. 252-253
Author(s):  
Francisco Najarro ◽  
Diego de la Fuente ◽  
Tom R. Geballe ◽  
Don F. Figer
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
Local Group ◽  
Galactic Center ◽  
Massive Stars ◽  
Star Formation History ◽  
Test Bed ◽  
Formation History ◽  
History Of ◽  
Stellar Properties

AbstractThe Galactic center (GC) region hosts three of the most massive resolved young clusters in the Local Group and constitutes a test bed for studying the star formation history of the region and inferring the possibility of a top-heavy scenario. Further, recent detection of a large number of apparently isolated massive stars within the inner 80 pc of the Galactic center has raised fundamental questions regarding massive star formation in a such a dense and harsh environment. Noting that most of the isolated massive stars have spectral analogs in the Quintuplet cluster, we have undertaken a combined analysis of the infrared spectra of both selected Quintuplet stars and the isolated objects using Gemini spectroscopy. We present preliminary results, aiming at α-elements versus iron abundances, stellar properties, ages and radial velocities which will differentiate the top-heavy and star-formation scenarios.

Experimental studies of main electrotechnical parameters of insulation of electric locomotives traction motors at drying by different methods

2020 ◽  
pp. 72-75
Author(s):  
Evgeniy Yuryevich Dulskiy ◽  
◽  
Pavel Yuryevich Ivanov ◽  
Anatoliy Mikhaylovich Khudonogov ◽  
Nikolay Nikolaevich Novikov ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Traction Motor ◽  
Traction Motors ◽  
Infra Red ◽  
Weak Points ◽  
Red Radiation

According to statistics more than 30 % of faults of freight electric locomotives are because of traction motors. One of the weak points in traction motor is the insulation. Insulation damages cause up to 75 % of all faults. The paper presents a comparison of two methods of traction motors insulation drying - a convective method and a method that uses thermal infra-red radiation, describes the principle of conducting the experiments, shows the analysis of main electrotechnical parameters of insulation samples after drying.

scholarly journals A Design Technique of Traction Motor for Efficiency Improvement Based on Multiobjective Optimization

2021 ◽  
Vol 12 (4) ◽  
pp. 260
Author(s):  
Shoulun Guo ◽  
Huichao Zhao ◽  
Yu Wang ◽  
Xiangrui Yin ◽  
Hongyang Qi ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Multiobjective Optimization ◽  
Design Optimization ◽  
Computation Time ◽  
Optimization Methods ◽  
Driving Cycle ◽  
Optimization Process ◽  
Additional Energy ◽  
Traction Motor ◽  
Traction Motors

With the increasing demand of driving range of new energy vehicle (NEV), design optimization for energy efficiency of traction motors became more important. However, traction motor design is complex since multiple objectives should be satisfied, such as the required torque-speed operating range and package and thermal constraints. This dramatically increases the computation time of the design optimization process, while the additional energy efficiency objective of the whole driving cycle. This paper proposes an equivalent driving cycle points extraction method, based on energy consumption equivalence to facilitate the design optimization of traction motors. This paper presents necessary rules of multiobjective optimization methods, and then gives an optimization process and proves the effectiveness.

Classification as a method of searching new designs of joints for mounting wheels and motors units of locomotives

2021 ◽  
pp. 8-14
Author(s):  
Andrey Sergeevich Kosmodamianskiy ◽  
◽  
Vladimir Ivanovich Vorobyev ◽  
Oleg Vasilyevich Izmerov ◽  
Dmitriy Nikolaevich Shevchenko ◽  
...  
Keyword(s):  
Bogie Frame ◽  
Traction Motor ◽  
New Methods ◽  
Traction Motors ◽  
Traction Drives ◽  
Electric Traction ◽  
Technical Solutions ◽  
Electric Traction Motor

The paper considers a task on a search for new methods aimed at development of patentability-based technical solutions of mounting electric traction motors to bogie frame by creating classifications. In result of the analysis, the authors propose a classification that allows systematizing designs of suspensions of all existing traction drives and axial gearboxes and allows determining possible search areas of new technical solutions. On the basis of the classification the authors have proposed designs of mounting electric traction motors to bogie frame, particularly, in conditions of limited vertical dimensions, suspensions of axial gearbox that provide the alignment of electric traction motor and the axial gearbox, and also new designs of connecting links.

Marine Gas Turbine Evaluation and Research at the Admiralty Test House, RAE Pyestock

1992 ◽  
Vol 114 (2) ◽  
pp. 169-173 ◽  
Author(s):  
C. J. Bruce ◽  
R. A. Cartwright
Keyword(s):  
Control Systems ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Data Gathering ◽  
Cost Effective ◽  
Test Bed ◽  
Test House ◽  
History Of ◽  
Transient Data ◽  
Test Control

The Admiralty Test House (ATH) at the Royal Aerospace Establishment Pyestock has provided test bed facilities for evaluation of marine gas turbines and ancillary equipments for Royal Naval use since 1952. While the ATH is presently undergoing an extensive refurbishment program in preparation for trials of the Rolls-Royce 20MW Spey SM1C, research continues on a number of innovative gas turbine condition monitoring techniques. This paper presents a brief history of the Marine Gas Turbine Section and describes the facilities of the ATH following major refurbishment. The capabilities of the steady-state and transient data gathering facilities are outlined, together with the automated engine and test control systems, which provide cost-effective engine evaluation in both endurance and minor equipment trials.

scholarly journals Fire history on the California Channel Islands spanning human arrival in the Americas

2016 ◽  
Vol 371 (1696) ◽  
pp. 20150167 ◽  
Author(s):  
Mark Hardiman ◽  
Andrew C. Scott ◽  
Nicholas Pinter ◽  
R. Scott Anderson ◽  
Ana Ejarque ◽  
...  
Keyword(s):  
Radiocarbon Dating ◽  
Fire History ◽  
Ice Age ◽  
Channel Islands ◽  
Test Bed ◽  
California Channel Islands ◽  
History Of ◽  
Santa Rosa Island ◽  
Age Range ◽  
The Impact

Recent studies have suggested that the first arrival of humans in the Americas during the end of the last Ice Age is associated with marked anthropogenic influences on landscape; in particular, with the use of fire which, would have given even small populations the ability to have broad impacts on the landscape. Understanding the impact of these early people is complicated by the dramatic changes in climate occurring with the shift from glacial to interglacial conditions. Despite these difficulties, we here attempt to test the extent of anthropogenic influence using the California Channel Islands as a smaller, landscape-scale test bed. These islands are famous for the discovery of the ‘Arlington Springs Man’, which are some of the earliest human remains in the Americas. A unifying sedimentary charcoal record is presented from Arlington Canyon, Santa Rosa Island, based on over 20 detailed sedimentary sections from eight key localities. Radiocarbon dating was based on thin, fragile, long fragments of charcoal in order to avoid the ‘inbuilt’ age problem. Radiocarbon dating of 49 such fragments has allowed inferences regarding the fire and landscape history of the Canyon ca 19–11 ka BP. A significant period of charcoal deposition is identified approximately 14–12.5 ka BP and bears remarkable closeness to an estimated age range of the first human arrival on the islands. This article is part of the themed issue ‘The interaction of fire and mankind’.

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