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- Ajmal, Muhammad, et al.
(författare)
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Flexible and Synthetic SDM Networks with Multi-core-Fibers Implemented by Programmable ROADMs
- 2014
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Ingår i: Proceedings of European Conference on Optical Communication ECOC2014, Cannes, France, September 21-25 September 2014. - : IEEE. ; , s. 1-3
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Konferensbidrag (refereegranskat)abstract
- This study looks into network planning issues for synthetic MCF-based SDM networks implemented through programmable ROADMs. The results show that significant savings in switching modules and energy can be attained by exploiting the flexibility inherent in programmable ROADM through a proper network design.
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- Alenius, Emma, et al.
(författare)
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Scattering of Plane Waves by a Constriction
- 2011
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Ingår i: Proceedings of ASME Turbo Expo 2011, Vol 7, Parts A-C. - : American Society Of Mechanical Engineers. - 9780791854679 ; , s. 1043-1052
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Konferensbidrag (refereegranskat)abstract
- Liner scattering of low frequency waves by an orifice plate has been studied using Large Eddy Simulation and an acoustic two-port model. The results have been compared to measurements with good agreement for waves coming from the downstream side. For waves coming from the upstream side the reflection is over-predicted, indicating that not enough of the acoustic energy is converted to vorticity at the upstream edge of the plate. Furthermore, the sensitivity to the amplitude of the acoustic waves has been studied, showing difficulties to simultaneously keep the amplitude low enough for linearity and high enough to suppress flow noise with the relatively short times series available in LES.
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| 8. |
- de Santiago, Juan, 1979-, et al.
(författare)
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Calculation of Tooth Ripple Losses in Solid Poles
- 2015
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Ingår i: Electric power components and systems. - : Taylor & Francis. - 1532-5008 .- 1532-5016. ; 43:3, s. 245-251
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Tidskriftsartikel (refereegranskat)abstract
- Tooth ripple losses in solid salient poles are calculated with analytical and semi-empirical methods. A numerical method based on the finite element method is presented in this article. The distribution of the eddy currents induced by the tooth ripple is obtained with this new method. The traditional analytic approach is based on some assumptions on the eddy current losses distribution that are finally verified with the Finite Element Method simulations presented. Analytic solutions of tooth ripple losses are only applicable to distributed windings with a homogeneous slot pitch while the method presented is applicable both to distributed and concentrated windings.
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| 9. |
- de Santiago, Juan, et al.
(författare)
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Comparison between axial and radial flux PM coreless machines for flywheel energy storage
- 2010
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Ingår i: Journal of Electrical Systems. - 1112-5209. ; 6:2
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Tidskriftsartikel (refereegranskat)abstract
- The need of a deeper understanding of coreless machines arises with new magnetic materials with higher remanent magnetization and the spread of high speed motors and generators. High energy density magnets allow complete ironless stator motor/generators configurations which are suitable for high speed machines and specifically in flywheel energy storage. Axial-flux and radial-flux machines are investigated and compared. The limits and merits of ironless machines are presented. An analytic solution of Maxwell’s equations is used to calculate the properties of axial-flux and radial-flux ironless generators. This method is used to investigate the influence of several parameters such as diameter and airgap width. Two machines have been calculated with FEM techniques and results are compared to validate the analytic method. Simulations conclude that end winding effects are more significant for axial-flux than for radialflux topologies. Radial-flux machines are more suitable for high speed ironless stators. The optimum values of some machine parameters are significantly different for ironless machines in comparison to slotted and slotless machines, such as outer radius to inner radius for axial-flux topologies. High speed coreless machines for energy storage and other applications required 3D FEM analysis for accurate results.
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| 10. |
- de Santiago, Juan, et al.
(författare)
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Dual voltage driveline for vehicle applications
- 2010
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Ingår i: International Journal of Emerging Electric Power Systems. - USA : Berkeley Electronic Press. - 2194-5756 .- 1553-779X. ; 11:3, s. 20 pp.-
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a novel driveline where the load and the energy source are operated at different voltage levels and they are galvanically insulated. The element that couples both part of the driveline is a Two Voltage Level Machine (TVLM). The machine is formed of a self-excited rotor and a stator with two sets of electrically isolated windings for adjustable speed drive applications. Both sets of these three phase windings are independently operated at different voltages. The equivalent circuit of the TVLM is deduced and phasor diagrams are presented. A complete driveline is simulated and the performance of the complete system is discussed. The driveline is applicable in flywheel energy storage systems for vehicles and power conditioning in renewable energy production.
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