Wyniki wyszukiwania - BazTech

1

Vessel-fender contact force modelling for a real-time ship manoeuvring simulator

Moreno F. M., Sasaki H. A. U., Makiyama H. S., Tannuri E. A.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2023

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Vol. 17 No. 4

813--820

EN

This paper presents the development of a method for calculating the horizontal contact forces between two bodies in a real-time ship manoeuvring simulator. The method was implemented in the simulator of the University of São Paulo, whose computing core is named “Dyna”. The model proposed calculates restoration and friction forces between bodies and has a Momentum-Impulse based criterion to reduce numerical issues when the simulation numerical integration has large time-steps. The model was empirically evaluated at the simulator by deck officers, in real-time simulations with pilots and tugmasters. We also ran simulations of that model to compare its performance under different integration time-steps lengths.

2

Simulation study to assess the effect of ship beam on the navigable flow conditions in Paris

Mansuy M., Candries M., Eloot K., Page S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2023

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Vol. 17 No. 1

25--31

EN

Traversing the river Seine in Paris is challenging for inland vessels due to the density and diversity of local traffic that is encountered in a confined environment. The waterway authority, Voies navigables de France (VNF), commissioned a study to assess the relevance of the current regulations when vessels of varying types cross Paris. A first simulation study showed that regulations based on length only may be too restrictive for ships with smaller beams [1]. This paper presents additional simulations executed on a full mission bridge simulator with ships of reduced beam. The main bottlenecks happen at different locations depending on the ship’s beam and ships with smaller beam can sail at higher water levels than the ships considered in the first study. The maximum water levels for which safe passage is possible were determined for each ship. Finally, recommendations have been formulated, which were then discussed with VNF and stakeholders.

3

Symulacja w czasie rzeczywistym dwóch falowników w konfiguracji master-follower wykorzystujących szybką synchronizację momentu i prędkości silnika

Jurczak Wojciech, Watoła Artur, Fievet Jerome

Maszyny Elektryczne : zeszyty problemowe

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2021

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Nr 1 (125)

61--70

PL

W artykule autorzy zaprezentowali nowatorskie podejście do testowania układu sterowania i kontroli współbieżnych lub synchronicznych układów napędowych wykorzystujących dwa przemienniki częstotliwości pracujące w konfiguracji master-follower. Układy kontroli przemienników częstotliwości zostały połączone za pomocą ultraszybkiego prototypowego układu komunikacji wykorzystującego złącze światłowodowe. Zaprezentowany testowy układ wykorzystywał „rzeczywiste”, pełnosprawne układy sterowania wybranych przemienników częstotliwości wraz z dwoma prototypowymi świadłowodowymi modułami komunikacji oraz komputerowego symulatora czasu rzeczywistego firmy OPAL-RT Technologies model OP5700. Komputerowy symulator czasu rzeczywistego OP5700 został wykorzystany do zasymulowania dwóch „wirtualnych” zestawów zawierających obwód mocy przemiennika częstotliwości oraz indukcyjnego silnika prądu przemiennego, każdy. Dodatkowo, w modelu komputerowym zaimplemenotwano uproszczony model sprzęgu mechaniczego pomiędzy wirnikami silników indukcyjnych, który w zależności od aplikacji mógł być łatwo modyfikowany. Całość pozwoliła skrócić znacząco czas potrzebny na weryfikację poprawności zaimplementowej metody sterowania i kontroli testowanego układu oraz na eliminowanie budowy kosztownych układów testowych, które w przypadku urządzeń dużych mocy, mogą być znaczne. W artykule zobrazowano konstrukcję całego układu testowego, omówiono przyjętą metodę połączenia części rzeczywistej z wirtualną oraz przedstawiono przykładowe aplikacje zestawu napędowego, na których bazowały modele komputerowe zaimplementowane w symulatorze czasu rzeczywistego OP5700. Na koniec przedstawiono i omówiono wybrane wyniki uzyskane podczas wykonanych symulacji komputerowych.

EN

Authors in the paper are presenting an innovative approach to testing control circuits of concurrent or synchronous drive systems using two industrial drives working in a master-follower configuration. Drive control circuits were connected through an ultra-fast prototype fiber communication card. In the presented test setup, two “real” fully operational drive control units were used. It included two prototype communication cards and a real time hardware-in-the-loop simulator from OPAL-RT technologies model OP5700. The real time simulator OP5700 was used to simulate two “virtual” drive systems, each containing one drive power circuit and an induction machine. Additionally, the motor mechanical shaft coupling was implemented in the simulated computer model. It could be easily modified depending on simulated application. Proposed test system allowed shortening significantly time required to verify correctness of implemented control method and eliminate the need to build laboratory test systems which can be significant for high power devices. In the paper, the whole construction of the tested setup was described together with interconnection between “real” and “virtual” part of. Moreover, it included the presentation of possible industrial applications on which computer models implemented in OP5700 real time simulator were based. At the end of this paper, selected results from simulation were presented and discussed.

4

Optimization of a ship turning basin using real time simulations – a case study for the Quai des Trois Fontaines (Chooz, France)

Mansuy M., Candries M., Eloot K., Wéry B.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2019

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Vol. 13, no. 2

357--363

EN

The Quai des Trois Fontaines is a berthing area in Chooz, France, which was designed for 80 m long vessels (CEMT Class IV) plying the River Meuse. A turning basin is located in front of the Quai des Trois Fontaines to allow vessels to turn before loading at the quay. Real time simulations on a dedicated inland ship manoeuvring simulator at Flanders Hydraulics Research were carried out with experienced skippers to study how the safety of the turning manoeuvre could be improved and which measures are required for safe manoeuvres with longer vessels, i.e. vessels of 85 and 90 m in length. In the first phase of the study, turning manoeuvres of CEMT Class IV vessels of 80 m, 85 m and 90 m long were studied in the existing environment. The manoeuvres were evaluated based on different safety criteria and on the feedback of the pilots. The real time simulations have shown that the actual design of the turning basin is suitable for the 80 m long vessels in any hydro-meteorological condition. However, the manoeuvres become risky with 85 m long vessels under certain conditions and impossible with longer ships. Although the current can be very strong on the river Meuse, the local width turned out to be the most critical parameter. In the second phase of the study, measures were proposed to allow the safe turning of 85 m and 90 m long vessels. Local widening of the river to 100 m and to 105 m were proposed for 85 m and 90 m long ships respectively. A third proposed measure is to provide a fixed point near the end of the quay, to which the vessels can attach and around which they can then turn.

5

Application of new POSICAST control method to synchronous generator excitation system

Ghorbani H., Monadi M., Ghorbani A., Candela J. I.

Journal of Power Technologies

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2018

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Vol. 98, nr 4

336--344

EN

In this paper, modeling, analysis, design and simulation of a POSICAST controller are presented for application in a generator’s excitation system. Simple structure is the most important characteristic of this controller. The controller is a feedforward compensator; it eliminates intensive over/undershoots in system dynamic response. Since changing the reference signal in the excitation system of the synchronous generator causes oscillations in the terminal voltage, the POSICAST controller (PC) is applied at the outset of the excitation system to mitigate these oscillations. The impact of the proposed controller on the stability of the studied power system is evaluated by both eigenvalues analysis and experimental results. In order to validate the theory, the performance of the designed controller is verified in OPAL-RT by experimental approach.

6

Low cost, high accuracy real-time simulation used for rapid prototyping and testing control algorithms on example of BLDC motor

Baszyński M.

Archives of Electrical Engineering

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2016

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Vol. 65, nr 3

463--479

EN

This article presents the simulation of a BLDC motor and its closed control system in FPGA. The simulation is based on a mathematical model of the motor, including the electromagnetic torque, phase currents, back electromotive force, etc. In order to ensure calculation precision, the equations describing the motor were solved using a floating point representation of real numbers, and a small step of numerical calculations of 1 μs was assumed. The time step selection methodology has been discussed in detail. The motor model was executed with the use of Textual Programming Languages (with HDL codes).