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Analysis of the effects of electromagnetic forces on the relative motion of a charged spacecraft formation flying

100%

Tealib S. K. , Abdel-Aziz Y. , Awad M. E.-S. , Khalil K. I. , Radwan M.

tom Vol. 55, No. 3

87--99

In recent years, studying Lorentz’s force has become a possible good means to control the spacecraft to reduce the fuel cost by modulating spacecraft electrostatic charge (magnetic and electric fields). The generation of Lorentz force is finite by the natural magnetic field and the relative velocity of the spacecraft. Therefore, the Lorentz force cannot fully occur from conventional propulsion technologies. Previous studies are concerned with studying Lorentz’s strength in the magnetic field only. In this work, we developed a mathematical model for a new technique establishing a raise in the level of charging in the spacecraft surface that is moving in the Earth’s magnetic field and provided by modulating spacecraft’s electrostatic charge that induces acceleration via the Lorentz force. The acceleration will be used to find the relationship between capacitance and power required to minimize the consumption of control energy used in such cases or to replace the usual control thruster by Lorentz force.

Analiza koncepcyjna dwuwirnikowej turbiny wiatrowej z osią pionową typu H-Darrieus

75%

Kłos P. , Miąskowski W. , Nalepa K. , Pietkiewicz P.

2017

tom nr 6

24--26

W artykule przedstawiono proces wyboru koncepcji turbiny wiatrowej wykorzystującej ruch względny dwóch wirników typu H-Darrieus. Zaprezentowano analizę obciążenia zespołu turbiny przepływającym strumieniem powietrza. Numeryczną analizę przepływu przeprowadzono w programie SolidWorks zawierającym dodatek Flow Simulation oraz Solidworks Simulation. Uzyskane wyniki porównano ze względu na dobór najkorzystniejszego rozwiązania konstrukcyjnego tego typu zespołów turbinowych. Opisano kilka koncepcji zespołu turbiny wiatrowej, proces powstawania siły nośnej, sposób analizy wyników oraz sformułowano na ich podstawie wnioski.

The paper presents the process of selecting a wind turbine concept, which makes use of relative motion of two H-Darrieus type rotors. This article focuses on analyzing the load of wind turbine unit through the flowing air stream. Numerical flow analysis was carried out in SolidWorks software which contains SolidWorks Flow Simulation and SolidWorks Simulation packages. The presented results were compared with the selection of the most advantageous design solution of the turbine units. Several conceptions of the wind turbine set, aerodynamic lift generation process, analyzing procedure and conclusions derived from them were also described.

The effect of high ship speed ratio on collision avoidance behavior of COLREGS

63%

Wang X. H. , Li L. , Chen G.

tom Vol. 13, no. 2

319--323

The speed ratio is an important factor that must be considered when two vessels will course change to avoid collision. In the process of the research on Personifying Intelligent Decision-making for Vessel Collision Avoidance (short for PIDVCA), it is found that the effect of collision avoidance based on the existing “International Regulations for Prevention Collision at sea” (short for COLREGS) is greatly affected by the high speed ratio (k=Vt/V0≥1.5). Through the analysis on the geometric change law of two vessels’ relative motion in Open waters, the effects of the responsibility for the ship collision avoidance under the COLREGS and special case for high-speed ratio is discussed. According to the collision avoidance measures taken for two vessels encounter situation, some reasonable suggestions are put forward and the simulation experiments that based on ship's intelligent collision avoidance simulation platform are given to support the idea.

Dynamic model of the external friction process of granular plant material

63%

Kaczorowski J. , Slipek Z.

tom 02