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Wyświetlanie 1-15 z 23
Tytuł:
Manoeuvring characteristics of the push train with an auxiliary steering device
Autorzy:
Abramowicz-Gerigk, T.
Burciu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/246386.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
inland push train manoeuvrability
manoeuvrability criteria
bow rotor
Opis:
The carried out and planned studies on the revitalisation of Odra and Vistula rivers in Poland and restoration of regular inland navigation put a great attention into environmental issues related to the operation of inland waterborne transport means. The design and operational parameters of inland ships and convoys are dependent on waterways dimensions and their influence on the environment. The article presents problems related to manoeuvring performance of the push train, which is the most popular inland waterborne means of freight transport in Poland and in Europe. The alternative auxiliary steering device improving push train manoeuvrability has been tested on the physical model of a push barge. The active bow steering device consisted two bow rotors has the influence on the operational safety of the push train with respect to improved manoeuvring characteristics and decreased impact on the environment, port and lock facilities, ships and boats in narrow passages. The results of model tests presented in the article allowed for estimation of turning ability of the push train with and without bow rotors. A significant difference was observed with respect to the manoeuvring area, distances of advance, tactical diameter, and time of the manoeuvre.
Źródło:
Journal of KONES; 2018, 25, 2; 7-13
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of vessel simulation model compatibility with its equivalent in reality
Autorzy:
Zwolan, P.
Czaplewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/320468.pdf
Data publikacji:
2013
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
simulation
mathematical modelling
manoeuvrability
Opis:
Complex simulation systems are often used in order to enhance the safety level on newly designed navigation areas and to facilitate their verification process. The application of these systems supersedes older methods based on manoeuvring basins, wherein models minified in particular scales were used. Modern methods are definitely cheaper and require less work. The paper presents the method of assessment of the compatibility of a ship simulation model with its real counterpart. Access to the simulator’s components responsible for creating and editing bodies of water as well as ship models gives the possibility of their verification. Using cutting-edge navigation systems such as inertial systems, weather stations and GPS gives the possibility of obtaining indispensable information about ship’s behaviour under certain hydro-meteorological conditions.
Złożone systemy symulacyjne są często używane dla poprawy poziomu bezpieczeństwa na etapie projektowania nowej infrastruktury nawigacyjnej, jak również dla ułatwienia procesu ich weryfikacji. Stosowanie tych systemów zastępuje starsze metody oparte na pomniejszonych modelach fizycznych i basenach modelowych, w których je testowano. Nowoczesne metody są zdecydowanie tańsze i wymagają mniej pracy. Artykuł przedstawia metodę oszacowania zgodności modelu symulacyjnego statku z jego rzeczywistym odpowiednikiem. Dostęp do komponentów symulatora odpowiedzialnych za tworzenie i modelowanie akwenu oraz modele statku daje możliwość ich sprawdzania. Jest to możliwe dzięki użyciu najnowszych systemów nawigacyjnych, takich jak systemy inercjalne, stacje meteorologiczne i GPS, które umożliwiają otrzymywanie niezbędnej informacji o zachowaniu się statku w konkretnych warunkach hydrometeorologicznych.
Źródło:
Annual of Navigation; 2013, 20; 163-170
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model tests of the resistance, propulsion and manoeuvrability of ships in the Experimental Centre in Ilawa
Autorzy:
Welnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/260211.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
resistance
propulsion
manoeuvrability
ships
Opis:
Paper presents the development of resistance, propulsion and steering quality model tests carried out on lake. Such pioneering investigations began in 1956 and were gradually improved and extended. Original equipment and measurement methods were developed. The paper presents those research methods and techniques,and also accuracy of the results, in a historical perspective. Described are also several most important research programmes accomplished in the Centre.
Źródło:
Polish Maritime Research; 2007, S 2; 8-12
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of artificial neural networks to assessment of ship manoeuvrability qualities
Autorzy:
Abramowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/258896.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
neural networks
ship manoeuvrability qualities
Opis:
This paper presents an attempt to applying neural networks for assessment of parameters of standard manoeuvrability tests, i.e. circulation test and zig-zag test. Methodological approach to application of neural networks as well as applied network structures and neuron activation functions are generally presented. Also, results of simulations performed by means of the elaborated networks are given in comparison with test cases selected at random. In order to analyze and reveal general trends, correlation relationships between results from network simulations and test cases were calculated and are presented as well.
Źródło:
Polish Maritime Research; 2008, 2; 15-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind effect simulation system in model tests of ship manoeuvrability
Autorzy:
Bednarek, A.
Jóźwiak, R.
Powiązania:
https://bibliotekanauki.pl/articles/258700.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship manoeuvrability
wind
wind effect simulation
Opis:
Dependence on hydro-meteorological conditions in the test area is an “Achilles’ heel” of physical experiment used for assessment of ship manoeuvrability. Aerodynamic forces and moments generated on the ship upperworks distort significantly the measured values. The paper presents new testing tool in the form of physical simulation of wind effect enabling quantitative evaluation of distortion of the measurement results. Another feature of the system enabling compensation of real atmospheric conditions prevailing during the experiment is also presented. The wind effects simulation arrangement includes board data acquisition and processing system, automatic control system and executive system consisting of industrial fans.
Źródło:
Polish Maritime Research; 2007, S 2; 64-67
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new method for a preliminary definition of a high–performance rudder for tuna purse seiners
Autorzy:
Martínez–López, A.
Munín–Doce, A.
Powiązania:
https://bibliotekanauki.pl/articles/259135.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
rudder optimisation
vessel manoeuvrability
tuna vessel design
Opis:
The aim of this paper is to provide a simple method for the definition of a rudder for tuna purse seiners. The model achieved by the application of this method ensures the manoeuvrability of initial turning, course keeping and yaw checking. For this, the results obtained by other authors, through rudder tests and manoeuvrability tests of fishing vessels have been integrated with the recommendations of the International Normative. Finally, in the paper the method is applied to the case of a tuna vessel, providing a rudder model which could be optimised with CFD (Computer Fluid Dynamics) in further tests. The method proposed can be applied to other vessels whose main dimensions are met.
Źródło:
Polish Maritime Research; 2012, 3; 26-35
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method to increase maneuverability of pilot-training jet aircraft
Autorzy:
Wiśniowski, W.
Gnarowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/244363.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
jet aircraft
aircraft manoeuvrability
Fowler flap
aerodynamic slots
Opis:
The article presents the positive results of the works performed at the Institute of Aviation in Warsaw, associated with modernization of a highly manoeuvrable training jet aircraft to make it reach the standards of increased manoeuvrability. It is shown how the maximum increase of a standard training aircraft manoeuvrability was achieved, which was the result of a small modification of the structure, along with the minimal costs of modernization and qualification tests. The paper also presents the basic process of modernization related to the development of iterative methodology, which includes numerical selection of mechanization elements, that is, strakes, slots and flaps. The parameters of the performed aerodynamic model are demonstrated as well as the results of the tests of its properties with the selected types of strakes conducted in a low-cost aerodynamic tunnel of 1.5 m diameter with the use of a sixelement aerodynamic weight. Parameters of the selected type of strake model with Fowler flap and slots are shown, as well as the results of the tests performed on it in the aerodynamic tunnel of 5 m diameter, and also the results of the buffeting resistance tests conducted in a transonic tunnel. The paper also presents the parameters of the designed optimized strakes, flaps and slots in 1:1 scale, which were mounted onto the aircraft prototype. Finally, the article presents the results of the full cycle of in-flight tests, which confirmed the anticipated project objectives and obtaining of a significant increase in the aircraft manoeuvrability by 48%.
Źródło:
Journal of KONES; 2016, 23, 3; 563-570
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of discrepancies in search areas in a diagram of an expanding square search
Autorzy:
Kasyk, L.
Pleskacz, K.
Bugajski, G.
Powiązania:
https://bibliotekanauki.pl/articles/135076.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
SAR
search area
manoeuvrability characteristics
earch patterns
rescue
accident
Opis:
Search patterns and procedures contained in the International Aeronautical and Maritime Search and Rescue Manual for Mobile Facilities meet the requirements of theoretical assumptions about search and rescue operations. But the individual manoeuvrability characteristics of a search vessel cause real search and rescue operations to differ from theoretical patterns. This article analyses the difference between theoretical and actual search regions in a Diagram of an Expanding Square Search. Different variants of parameters of ship manoeuvrability have been considered. Some solutions modifying the Diagram of Expanding Square Search are proposed by the authors.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 94-98
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low speed wind tunnel test of the jet trainer model at high angles of attack
Autorzy:
Smędra, K.
Świerkot, R.
Kubryński, K.
Powiązania:
https://bibliotekanauki.pl/articles/949501.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aerodynamics
aerodynamic project
high angles of attack aerodynamics
manoeuvrability
Opis:
The article discusses the results of the wind tunnel test of the model of the highly manoeuvrable jet trainer, in the wide range of angles of attack. The main objective of this work was to modify the geometry in order to achieve the assumed properties (stability, control and dynamic behaviour in terms of high angles of attack), and possibly reliable verification of characteristics. In order to control the geometry of subsequent variants of aerodynamic models during the test, the full parametric representation of the CAD geometry was used (applying Siemens NX system) and the modular construction of the models. This enables to change the various components (e.g. the front part of the fuselage, the air inlets, wings, tail, strakes etc.). The wind tunnel models were produced using 3D printers, based on the FDM (Fused Deposition Modelling) method. This allows for relatively fast model prototyping while maintaining full control of geometry and very low cost. Studies were conducted using several models differing in geometry as well (in order to determine the effect of blockage) model scale implementation. Studies carried out in a low speed wind tunnel using an internal balance mounted on bent sting (to enable measurement at high angles of attack). The measurements were carried out in the range of angles of attack -2° to 56° and slip angles +/- 20°, with different deflections of leading edge flaps, trailing edge flaps, elevator, rudder and ailerons. The static aerodynamic characteristics of final version of the model indicates the correct properties in the entire range of flight conditions: the ability to ensure a longitudinal balance with appropriate longitudinal moments necessary to control (reduce the angle of attack), the correct dynamic characteristics at high angles of attack (no pro-spin trend) and the ability to lateral and directional control. Some interesting novelty that will be presented in the paper is a preliminary evaluation of the dynamic properties of the aircraft at high angles of attack, carried out on the model in the tunnel, providing three degrees of freedom (rotation about all three axes).
Źródło:
Journal of KONES; 2016, 23, 4; 471-478
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and Evaluation of Manoeuvrability Characteristics of Polish Ferries m/f „Polonia” and m/f „Gryf”
Autorzy:
Szymoński, M.
Powiązania:
https://bibliotekanauki.pl/articles/116942.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Manoeuvrability, Polish Ferry m/f „Polonia”
Polish Ferry m/f Gryf
Ystad Harbour
Wind Force, Manoeuvrability Characteristics
Pilot Navigation
Port Manoeuvrings
Opis:
The paper describes some specific manner of M/F “Polonia” manoeuvring at the Ystad harbour where she is regarded to be “over maximal ship” and also M/F “Gryf” manoeuvring at Trelleborg, taking part into consideration the effect of wind pressure into the ship’s superstructures and houses.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 515-518
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of speed reduction on navigational safety of container ships
Autorzy:
Przywarty, M.
Gucma, L.
Perkovic, M.
Powiązania:
https://bibliotekanauki.pl/articles/360026.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
real-time simulation
speed reduction
navigational safety
movement parameters
manoeuvrability
Opis:
Paper presents results of a real-time simulation experiment which was carried out to study an influence of speed reduction on the navigational safety of container ships. In order to determine changes in the vessels manoeuvrability set of simulated sea trials was carried out. The tests included the measuring of the movement parameters of ships proceeding with different initial speed in different external conditions.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 125-130
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conceptual and aerodynamic study of a highlymanoeuvrable jet trainer
Autorzy:
Kubrynski, K.
Powiązania:
https://bibliotekanauki.pl/articles/245019.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aerodynamics
aerodynamic project
high angle of attack
manoeuvrability
aircraft design
Opis:
The article discusses the initial study of the two-seat jet trainer with high manoeuvrability. The study included the concept of structural layout of the aircraft, as well as the development of its aerodynamics. The mail aim was to ensure the correct airplane characteristics (in particular control efficiency and dynamic properties) in the wide range of angles of attack. Another challenge was to ensure adequate aerodynamic characteristics at high transonic speed range. The geometry of the aircraft has been developed using CAD system (Simens NX). Initial aerodynamic study and aerodynamic design of the plane were performed using both: the low speed wind tunnel tests performed at Warsaw University of Technology using six-component internal balance and computational work performed using ANSYS CFX computer system. The first was used mainly to check characteristics at high angles of attack. Modifications of the wind tunnel model geometry at this stage were performed using the plastic mass (plasticine), or replacing some components of the model. An important problem with such approach was the lack of a precise definition of the revised geometry in the CAD system. Computational study was performed mainly to check high-speed characteristics. The final geometry of the modified wind tunnel model generally meets the requirements.
Źródło:
Journal of KONES; 2016, 23, 4; 245-252
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bank effect and operation of inland waterways vessels
Autorzy:
Kobyliński, L.
Powiązania:
https://bibliotekanauki.pl/articles/359620.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
inland waterways shipping
bank effect
ship manoeuvrability
training in ship handling
Opis:
Inland waterways vessels operate in waters of restricted depth and restricted width with cross-section of the waterway of different profile. These conditions affect hydrodynamic forces acting on the vessel and in consequence they affect their operation. There are several hydrodynamic effects present in inland waterways. Restricted depth and cross-section of the canal or river affects resistance of the vessel and hydrodynamic characteristics of the propeller and in consequence propulsive efficiency. Another effect is caused by modification of pressure distribution around vessel body resulting in change of draft, so called squat. Finally in narrow fairway lateral forces on the vessel are created and in case of non-symmetrical position of the vessel, those forces are also non-symmetric and causing that the vessel is pushed to one side. This affects safe handling of the vessel and requires understanding and skill of operator. This problem is discussed in the paper.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 37 (109); 50-55
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of hydrodynamic coefficients from results of real ship sea trials
Autorzy:
Kim, D.
Powiązania:
https://bibliotekanauki.pl/articles/260199.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship manoeuvrability
system identification method
hydrodynamic coefficients
sea trials
mathematical optimization
Opis:
This paper suggests an estimation method for ship’s hydrodynamic coefficients, which is based on the system identification method that calculates an optimum value in a mathematical way. For the purpose of modelling existing ships, this study collects real ship sea trial data as benchmarks. Prior to the optimization, a sensitivity analysis is carried out for easy and effective optimization. The simulation results using optimized coefficients agree well with corresponding benchmarks. Following this, with various trim and draught conditions, this study suggests new estimation formulas that concern all trim and draught conditions. Simulation results applying the estimation formulas are satisfactory in regard to a corresponding benchmark, compared to a result obtained by using an existing regression formula.
Źródło:
Polish Maritime Research; 2018, 4; 65-72
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propozycja poprawy manewrowości czołgu Twardy
Proposal to improve manoeuvrability of Twardy battle tank
Autorzy:
Mysłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/347342.pdf
Data publikacji:
2014
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
czołgi
PT-91 Twardy
silniki czołgowe
manewrowość
battle tanks
tank engines
manoeuvrability
Opis:
W artykule przedstawiono podstawowe parametry charakteryzujące manewrowość oraz dokonano przeglądu współczesnych czołgów z punktu widzenia parametrów świadczących o tych właściwościach. Na tle innych czołgów średnich pokazano parametry czołgu Twardy. Na podstawie badań własnych dotyczących elastyczności spalinowych silników wysokoprężnych zaproponowano możliwości poprawy parametrów silnika czołgu Twardy w ten sposób, by nie przekracza-no jego obciążeń cieplnych i mechanicznych. Rozwiązanie to ma a jednocześnie służyć poprawie jego manewrowości przy względnie niewysokim nakładzie pracy. Przedstawiono jego wpływ na parametry napełnienia silnika oraz zadymienie spalin.
The article presents the basic parameters characterizing manoeuvrability and provides an over-view of modern battle tanks from the point of view of parameters proving these properties. The author compares the parameters of other medium battle tanks to the ones of the Twardy battle tank. On the basis of own research on flexibility of diesel engines, the author suggests how to improve engine parameters of the Twardy battle tank in such a way so as not to exceed its ther-mal and mechanical loads. The solution is at the same time to serve to improve its manoeuvra-bility at relatively small effort. The article also presents its impact on engine performance and exhaust fumes smokiness.
Źródło:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2014, 1; 150-160
1731-8157
Pojawia się w:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:
Biblioteka Nauki
Artykuł
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