scholarly journals To the choice of the MAGLEV system traction linear synchronous motorstator winding scheme

2020 ◽  
Vol 6 (1) ◽  
pp. 48-62
Author(s):  
Konstantin K. Kim ◽  
Igor R. Kron ◽  
Vadim V. Veshkin
Keyword(s):  
High Speed ◽  
Analytical Study ◽  
Lateral Displacement ◽  
Single Layer ◽  
Stator Winding ◽  
Aim Analysis ◽  
Traction Motor ◽  
Higher Harmonics ◽  
Maglev System ◽  
Electromagnetic Processes

Aim: Analysis of electromagnetic processes in the linear synchronous traction motor of high-speed ground transport (MAGLEV) and the choice of stator winding connection schemejustification. Methods: An analytical study of theoretical relations. Results: The study found that a two-layer stator winding connection scheme is more preferable Conclusion: A system with a single-layer stator winding connection circuit is characterized by loading excitation solenoids with harmful forces, the inefficiency of their protection from the higher harmonics of the stator winding by choosing the geometry of its coil and solenoid, and the formation of additional colliding force during lateral displacement of the underframe. All these unadvisable effects are absent in a two-layer scheme.

Technological Development of High Speed Maglev System Based on Low Vacuum Pipeline

2018 ◽  
Vol 20 (6) ◽  
pp. 105
Author(s):  
Zhongwei Feng ◽  
Xing Fang ◽  
Hongmei Li ◽  
Aijun Cheng ◽  
Yongjie Pan
Keyword(s):  
High Speed ◽  
Technological Development ◽  
Maglev System

Reliability Models of GSM-R Redundant Network on High-Speed Railway

2012 ◽  
Vol 198-199 ◽  
pp. 1783-1788
Author(s):  
Jun Ting Lin ◽  
Jian Wu Dang
Keyword(s):  
Network Architecture ◽  
High Speed ◽  
Failure Time ◽  
Network Reliability ◽  
Single Layer ◽  
Double Layers ◽  
High Speed Railway ◽  
Reliability Models ◽  
Single Layer Network ◽  
Wireless Architectures

As a dedicated digital mobile communication system designed for railway application, GSM-R must provide reliable bidirectional channel for transmitting security data between trackside equipments and on-train computer on high-speed railways. To ensure the safety of running trains, redundant network architecture is commonly used to guarantee the reliability of GSM-R. Because of the rigid demands of railway security, it is important to build reliability mathematical models, predict the network reliability and select a suitable one. Two common GSM-R wireless architectures, co-sited double layers network and intercross single layer network, are modeled and contrasted in this paper. By calculating the reliabilities of each reliable model, it is clear that more redundant the architecture is, more reliable the system will be, the whole system will bear a less failure time per year as the benefit. Meanwhile, as the redundancy of GSM-R system raises, its equipment and maintenance will cost much, but the reliability raise gently. From the standpoint of transmission system interruption and network equipment failure, the reliability of co-sited double layer network architecture is higher than the intercross single layer one, while the viability and cost of the intercross redundant network is better than co-sited one in natural disasters such as flood and lightning. Taking fully into account reliability, viability and cost, we suggest that intercross redundant network should be chosen on high-speed railway.

scholarly journals Nanoprinted high-neuron-density optical linear perceptrons performing near-infrared inference on a CMOS chip

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Elena Goi ◽  
Xi Chen ◽  
Qiming Zhang ◽  
Benjamin P. Cumming ◽  
Steffen Schoenhardt ◽  
...  
Keyword(s):  
Machine Learning ◽  
High Speed ◽  
Near Infrared ◽  
Single Layer ◽  
Infrared Region ◽  
Optical Devices ◽  
Medical Diagnostics ◽  
Oxide Semiconductor ◽  
Process Data ◽  
Neuron Density

AbstractOptical machine learning has emerged as an important research area that, by leveraging the advantages inherent to optical signals, such as parallelism and high speed, paves the way for a future where optical hardware can process data at the speed of light. In this work, we present such optical devices for data processing in the form of single-layer nanoscale holographic perceptrons trained to perform optical inference tasks. We experimentally show the functionality of these passive optical devices in the example of decryptors trained to perform optical inference of single or whole classes of keys through symmetric and asymmetric decryption. The decryptors, designed for operation in the near-infrared region, are nanoprinted on complementary metal-oxide–semiconductor chips by galvo-dithered two-photon nanolithography with axial nanostepping of 10 nm1,2, achieving a neuron density of >500 million neurons per square centimetre. This power-efficient commixture of machine learning and on-chip integration may have a transformative impact on optical decryption3, sensing4, medical diagnostics5 and computing6,7.

Effect of unbalanced magnetic pull on the thermal characteristics of traction motor bearing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tingting Wang ◽  
Dongli Song ◽  
Weihua Zhang ◽  
Shiqi Jiang ◽  
Zhiwei Wang
Keyword(s):  
Thermal Analysis ◽  
High Speed ◽  
Thermal Characteristics ◽  
Expansion Method ◽  
Fourier Series Expansion ◽  
High Speed Train ◽  
Traction Motor ◽  
Content Type ◽  
Unbalanced Magnetic Pull ◽  
Motor Bearing

Purpose The purpose of this paper is to analyze the unbalanced magnetic pull (UMP) of the rotor of traction motor and the influence of the UMP on thermal characteristics of traction motor bearing. Design/methodology/approach The unbalanced magnetic pull on the rotor with different eccentricity was calculated by Fourier series expansion method. A bearing thermal analysis finite element model considering both the vibration of high-speed train caused by track irregularity and the UMP of traction motor rotor was established. The validity of the model is verified by experimental data obtained from a service high-speed train. Findings The results show that thermal failure of bearing subassemblies most likely occurs at contact area between the inner ring and rollers. The UMP of rotor of traction motor has a significant effect on the temperature of the inner ring and roller of the bearing. When the eccentricity is 10%, the temperature can even be increased by about 12°C. Therefore, the UMP of rotor of traction motor must be considered in thermal analysis of traction motor bearing. Originality/value In the thermal analysis of the bearing of the traction motor of high-speed train, the UMP of the rotor of the traction motor is considered for the first time

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