Aluminum-lead antifriction alloys produced under conditions of compensation of gravitational segregation by electromagnetic forces

1982 ◽  
Vol 24 (4) ◽  
pp. 239-243 ◽  
Author(s):  
O. V. Abramov ◽  
N. A. Bushe ◽  
Yu. M. Gel'fgat ◽  
T. F. Markova ◽  
Zh. Yu. Chashechkina
Keyword(s):  
Electromagnetic Forces ◽  
Gravitational Segregation ◽  
Antifriction Alloys

Harmonic Electromagnetic Forces in Induction Motors

2009 ◽  
Vol 129 (4) ◽  
pp. 375-381 ◽  
Author(s):  
Fuminori Ishibashi ◽  
Makoto Matsushita ◽  
Shinichi Noda
Keyword(s):  
Induction Motors ◽  
Electromagnetic Forces

scholarly journals Properties of Journal Bearing Materials That Determine Their Wear Resistance on the Example of Aluminum-Based Alloys

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 535
Author(s):  
Alexander Mironov ◽  
Iosif Gershman ◽  
Eugeniy Gershman ◽  
Pavel Podrabinnik ◽  
Ekaterina Kuznetsova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Journal Bearing ◽  
Tribological Behavior ◽  
Secondary Structures ◽  
Magnesium Content ◽  
Wear Rates ◽  
Relative Extension ◽  
Bearing Materials ◽  
Antifriction Alloys

Potential relations of tribological characteristics of aluminum antifriction alloys with their compositions and mechanical properties were investigated. In this regard, the properties of eight aluminum alloys containing tin from 5.4% to 11% doped with lead, copper, silicon, zinc, magnesium, and titanium were studied. Mechanical properties such as hardness, strength, relative extension, and impact strength were analyzed. Within the tribological tests seizure load and wear of material were evaluated and secondary structures were studied afterwards. The absence of a definitive correlation between tribological behavior and mechanical properties was shown. It was determined that doping tin over 6% is excessive. The seizure load of the alloys increases with the magnesium content. Secondary structures of the alloys with higher wear rates contain one order less magnesium and tin.

scholarly journals An FTC Design via Multiple SOGIs with Suppression of Harmonic Disturbances for Five-Phase PMSG-Based Tidal Current Applications

2021 ◽  
Vol 9 (6) ◽  
pp. 574
Author(s):  
Zhuo Liu ◽  
Tianhao Tang ◽  
Azeddine Houari ◽  
Mohamed Machmoum ◽  
Mohamed Fouad Benkhoris
Keyword(s):  
Fault Tolerance ◽  
Energy Conversion ◽  
Tidal Current ◽  
Fault Tolerant ◽  
Tidal Current Energy ◽  
Electromagnetic Forces ◽  
Model Free ◽  
Energy Conversion Systems ◽  
Power Scale ◽  
Current Energy

This paper firstly adopts a fault accommodation structure, a five-phase permanent magnet synchronous generator (PMSG) with trapezoidal back-electromagnetic forces, in order to enhance the fault tolerance of tidal current energy conversion systems. Meanwhile, a fault-tolerant control (FTC) method is proposed using multiple second-order generalized integrators (multiple SOGIs) to further improve the systematic fault tolerance. Then, additional harmonic disturbances from phase current or back-electromagnetic forces in original and Park’s frames are characterized under a single-phase open condition. Relying on a classical field-oriented vector control scheme, fault-tolerant composite controllers are then reconfigured using multiple SOGIs by compensating q-axis control commands. Finally, a real power-scale simulation setup with a gearless back-to-back tidal current energy conversion chain and a small power-scale laboratory prototype in machine side are established to comprehensively validate feasibility and fault tolerance of the proposed method. Simulation results show that the proposed method is able to suppress the main harmonic disturbances and maintain a satisfactory fault tolerance when third harmonic flux varies. Experimental results reveal that the proposed model-free fault-tolerant design is simple to implement, which contributes to better fault-tolerant behaviors, higher power quality and lower copper losses. The main advantage of the multiple SOGIs lies in convenient online implementation and efficient multi-harmonic extractions, without considering system’s model parameters. The proposed FTC design provides a model-free fault-tolerant solution to the energy harvested process of actual tidal current energy conversion systems under different working conditions.

Equilibrium Shape of a Liquid Metal Subject to Electromagnetic Forces

2004 ◽  
Vol 40 (2) ◽  
pp. 585-588 ◽  
Author(s):  
R. Moretti ◽  
S. Dufour ◽  
G. Vinsard ◽  
B. Laporte
Keyword(s):  
Liquid Metal ◽  
Equilibrium Shape ◽  
Electromagnetic Forces

scholarly journals On the distribution of the scattered Röntgen radiation

1912 ◽  
Vol 86 (589) ◽  
pp. 478-494 ◽  
Keyword(s):  
Wave Front ◽  
Scattered Radiation ◽  
Single Electron ◽  
Primary Beam ◽  
Secondary Radiation ◽  
Electromagnetic Forces ◽  
Probable Explanation ◽  
The Mean ◽  
Most Probable Explanation

The fact that a substance through which Röntgen rays from a focus tube are passing becomes itself a source of secondary Röntgen rays has long- been known. The most probable explanation was given by Prof. Sir J. J. Thomson. If a Röntgen pulse is due to the acceleration of a charged electron, then if the electrons in the atom are free to move under the action of the electromagnetic forces in the wave front of the primary Röntgen pulse, their motion will be accelerated during the passage of the latter through the atom, and they will themselves become sources of secondary Röntgen radiation. Considering only a single electron, the intensity of the secondary radiation at any angle α with the direction of motion will be proportional to sin 2 α . If the primary beam is unpolarised, the motion of the electron may have any direction in the plane at right angles to the primary beam. The intensity of the scattered radiation in the direction θ with the primary beam is thus the mean of all the values of sin 2 α for that direction. It can easily be shown that this is proportional to 1 + cos 2 θ . If I' θ is the intensity of the scattered radiation in the direction θ , we thus have I' θ = I' π /2 (1 + cos 2 θ ).

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