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1
Content available Practical aspects of using radar in maritime navigation with analysis of its potential errors and limitations
Rutkowski Grzegorz
Scientific Journal of Gdynia Maritime University
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2020
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nr 113
17--28
EN
In this article, the author will try to explain the basic principles of the practical focus of using radar in maritime navigation, analysing its potential errors and limitations. An attempt will also be made to describe the basic seamanship practice of how to set up the radar, determine the radar blind sectors, calculate the radar position accuracy, generate a basic anti-collision radar report, calculate CPA, TCA, BCR, BCT etc., and verify the effectiveness of a trial anti-collision manoeuvre by using the radar in the different radar modes when navigating in restricted sea areas.
2
Content available Analysis of the effects of electromagnetic forces on the relative motion of a charged spacecraft formation flying
Tealib Shafeeq Kaheal, Abdel-Aziz Yehia, Awad Mervat EL-Said, Khalil Khalil Ibrahim, Radwan Mohmed
Artificial Satellites : Journal of Planetary Geodesy
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2020
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Vol. 55, No. 3
87--99
EN
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.
3
Content available The effect of high ship speed ratio on collision avoidance behavior of COLREGS
Wang X. H., Li L., Chen G.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2019
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Vol. 13, no. 2
319--323
EN
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.
4
Analiza koncepcyjna dwuwirnikowej turbiny wiatrowej z osią pionową typu H-Darrieus
Kłos P., Miąskowski W., Nalepa K., Pietkiewicz P.
Przegląd Mechaniczny
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2017
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nr 6
24--26
PL
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.
EN
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.
5
Content available Wpływ tłumienia na stateczność strumienia oscylatorów oddziałującego z belką. Stateczność przepływu cieczy
Bogacz R., Czyczuła W., Pawlak-Burakowska A.
Symulacja w Badaniach i Rozwoju
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2012
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Vol. 3, nr 2
71--77
PL
W niniejszej pracy rozważana jest stateczność ruchu układu złożonego ze strumienia gęsto rozłożonej masy (oscylatorów) oddziałującego sprężyście lub lepko-sprężyście z belką na podłożu Winkera (np. modelującej rurę). Układ taki może być uproszczonym modelem układu pociąg - tor lub modelem rurociągu, przez który przepływa ciecz (dla uproszczenia nieściśliwa).
EN
The paper is devoted to the stability of motion of the system composed of a stream of densely distributed mass (oscillators), elastic or visco-elastic interacting with a beam on the Winkler foundation (i.e. modeling a pipe). Such a system can be a simplified model of train-track system or pipe conveying fluid (for simplification non-compressive fluid).
6
Content available Optimum braking of elastic object
Bokhonsky A., Varminska N.
Selected Engineering Problems
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2012
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nr 3
27--34
EN
In [1] the classical design procedure of elastic suspension of solid body is given. It includes static calculation of suspension (definition of static reactions); calculation of own frequencies of vibrating protection system with six degrees of freedom; definition of amplitudes of the object compelled fluctuations at harmonious influence. In [2] results of numerical experiments on research of elastic suspension dynamics, executed on the basis of specially developed program "VIBRO", are given. In [3, 4] laws of optimum motion of elastic systems with final number of degrees of freedom are proved and illustrated on examples. The research purpose – the analysis of elastic suspension dynamics at optimum braking.
7
Content available On the material and spatial description of rigid fields
Rudnicki M.
Journal of Theoretical and Applied Mechanics
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2005
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Vol. 43 nr 4
825--840
EN
Rigid kinematics is re-examined applying the material, spatial and mixed description without use of any coordinate system. Some tensor representations for the displacement gradient, velocity gradient, and acceleration gradient are obtained. Special cases of rotation about fixed as well as nearly fixed axis are distinguished. Assumption of small rotation is also taken into account. Relative motion of a particle is briefly described.
PL
Rozważono kinematykę ciała sztywnego w opisie materialnym, przestrzennym i mieszanym bez wprowadzania układu współrzędnych. Przedstawiono reprezentacje tensorowe gradientów pól przemieszczenia, prędkości i przyspieszenia. Wyodrębniono przypadki szczególne obrotu wokół stałej oraz prawie stałej osi. Zbadano ruch przy założeniu małego obrotu. Naszkicowano zagadnienie ruchu względnego cząstki.
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