Results 11 to 20 of about 2,137,948 (299)

Triac Based Novel Single Phase Step-Down Cycloconverter with Reduced THDs for Variable Speed Applications

Applied Sciences, 2021
In variable speed applications, the cycloconverter-based AC to AC power conversion technique has gained more attention among researchers and academics than the traditional rectifier-inverter-based AC to AC power conversion process.
Tariqul Islam, Hady H. Fayek, Eugen Rusu, Fayzur Rahman   +3 more
doaj   +1 more source

Order-Based Identification of Bearing Defects under Variable Speed Condition

Applied Sciences, 2021
Condition monitoring of rotating machinery plays an important role in reducing catastrophic failures and production losses in the 4.0 Industry. Vibration analysis has proven to be effective in diagnosing rotating machine failures.
Mohamed Habib Farhat, Xavier Chiementin, Fakher Chaari, Fabrice Bolaers, Mohamed Haddar   +4 more
doaj   +1 more source

Causal Effect of Leading-Edge Sawtooth Configuration on Flow Field Characteristics and Aerodynamic Losses in the Supersonic Compressor Cascade [PDF]

Journal of Applied Fluid Mechanics
This study focuses on the TM-141 supersonic compressor blade as the subject of investigation. Utilizing the Reynolds-averaged numerical simulation approach, the study examines the impact of the leading-edge sawtooth structure on the blade grid, flow ...
S. J. Hu, Z. J. Wei, M. Ni, G. M. Ren
doaj   +1 more source

Envelope demodulation method based on SET for fault diagnosis of rolling bearings under variable speed

Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2020
Time-frequency analysis can effectively reveal the fault characteristics of rolling bearings under variable speed conditions. However, the traditional time-frequency analysis method cannot meet the requirements of anti-noise ability and time-frequency ...
Zengqiang MA, Xin LI, Suyan LIU, Yongjie GE, Feiyu LU   +4 more
doaj   +1 more source

Variable flow and optimization of chiller loading effect on energy saving for screw vapor compression-single effect absorption hybrid chiller plant in hospital mechanical room ‒ case study: Tehran heart hospital

Mechanics & Industry, 2021
Chiller plants are the most energy consuming system during summer season in residential, commercial and hospital buildings. The highly variable cooling demand of the buildings connected to a hybrid chiller plant included absorption and vapor compression ...
Boghosian Ronald, Mafi Mostafa, Panjeshahi Mohammad Hassan, Ataei Abtin   +3 more
doaj   +1 more source

Thermoacoustic tomography with variable sound speed [PDF]

, 2009
We study the mathematical model of thermoacoustic tomography in media with a variable speed for a fixed time interval, greater than the diameter of the domain.
Agranovsky M, Duistermaat J J, Finch D, Gunther Uhlmann, Haltmeier M, Hristova Y, Hristova Y, Lasiecka I, Patch S K, Plamen Stefanov, Taylor M E, Trèves F, Trèves F, Xu Y   +13 more
core   +4 more sources

Geometrodynamics of Variable-Speed-of-Light Cosmologies [PDF]

, 2000
This paper is dedicated to the memory of Dennis Sciama. Variable-Speed-of-Light (VSL) cosmologies are currently attracting interest as an alternative to inflation.
A. Albrecht, A. E. Everett, A. E. Everett, A. Guth, A. H. Guth, A. Yates, B. A. Bassett, B. A. Bassett, B. Nodland, Bruce A. Bassett, C.-P. Ma, Carmen Molina-París, D. Colladay, D. Colladay, D. H. Coule, D. Kramer, E. Kiritsis, E. W. Kolb, E. Yablonovitch, F. Belgiorno, G. Amelino-Camelia, G. Barton, G. Barton, G. F. R. Ellis, G. Huey, G. M. Shore, H. B. Nielsen, H. B. Nielsen, H. van Elst, I. T. Drummond, J. C. D’Olivo, J. D. Barrow, J. D. Barrow, J. D. Barrow, J. Ellis, J. F. Nieves, J. K. Webb, J. Lesgourgues, J. Levin, J. Levin, J. Robinson, J. W. Moffat, J. W. Moffat, K. Scharnhorst, K. Subramanian, L. Kofman, M. A. Clayton, M. A. Clayton, M. J. Drinkwater, M. Novello, M. Visser, M. Visser, M. Visser, Matt Visser, N. J. Turok, N. J. Turok, P. Jain, P. P. Avelino, P. Schnieder, R. Bluhm, R. Bluhm, R. D. Daniels, R. D. Daniels, R. D. Peccei, R. R. Caldwell, S. Carlip, S. Chadha, S. Coleman, S. Coleman, S. Liberati, S. M. Carroll, S. M. Carroll, S. M. Carroll, S. M. Carroll, Stefano Liberati, T. Damour, T. Jacobson, T. Jacobson, W. Dittrich, W. G. Unruh, W. G. Unruh, W. H. Zurek, Y. Hu, Y. Shtanov, Y. Su   +84 more
core   +2 more sources

Drive-Tolerant Current Residual Variance (DTCRV) for Fault Detection of a Permanent Magnet Synchronous Motor Under Operational Speed and Load Torque Conditions

IEEE Access, 2021
This paper proposes a novel method that uses stator current signals to detect motor faults under operational speed and load torque conditions. Previous studies on motor current signature analysis (MCSA) have been devoted to developing methods to detect ...
Chan Hee Park, Junmin Lee, Hyeongmin Kim, Chaehyun Suh, Myeongbaek Youn, Yongjin Shin, Sung-Hoon Ahn, Byeng D. Youn   +7 more
doaj   +1 more source

Variable Speed Power

Procedia Engineering, 2015
AbstractThis article shows an application of a double source generator for windmills. It is shown the design and the principle of operation of the electric machine. This machine was modeled with using Solisworks program for creating design and Maxwell program for analyzing of magnet field. The result of modeling is shown too.
Gandzha, S.A., Kiessh, I.E.
openaire   +1 more source

Searching a Variable Speed Network [PDF]

Mathematics of Operations Research, 2014
A point lies on a network according to some unknown probability distribution. Starting at a specified root of the network, a Searcher moves to find this point at speeds that depend on his location and direction. He seeks the randomized search algorithm that minimizes the expected search time.
Alpern, Steve, Lidbetter, Thomas
openaire   +2 more sources