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Wyświetlanie 1-15 z 149
Tytuł:
On the possibility of ship’s steering gear load monitoring by observing the number of reversals in a specific time
Autorzy:
Stefanowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/135527.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
automatic control
steering the ship
steering gear of a vessel
load of steering gear
rough sea conditions
Opis:
This article presents the problem of overloading of the steering gear controlled by an autopilot in high sea states and ways of reducing it. The author proposes a new method of estimating the steering gear load by counting the number of machine reversals in a selected time period. A block diagram of such solution is presented along with the results of simulations of system operation in different sea states. The results obtained, in terms of number of reversals, depend significantly on the state of sea, providing a means to estimate the current state of the sea as well as the expected difficulty in exploiting the steering gear.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 59-62
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany w sterowaniu przenośnikami dające wymierne korzyści
Changes in conveyors control resulting with tangible benefits
Autorzy:
Hertel, L.
Nowacki, H.
Powiązania:
https://bibliotekanauki.pl/articles/170836.pdf
Data publikacji:
2014
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
sterowanie
przenośniki
steering
conveyor
Opis:
W artykule przedstawiono nowe rozwiązania w transporcie urobku przenośnikami poprzez zmiany w sterowaniu przy zastosowaniu nowego algorytmu.
New solutions of output transportation with conveyors have been presented in the paper. The changes in conveyor steering including new algorithm application have been discussed.
Źródło:
Górnictwo Odkrywkowe; 2014, 55, 1; 44-47
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conceptual Analysis in the Field of Management
Autorzy:
Pilarski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1961876.pdf
Data publikacji:
2021-12-30
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
management
command
directing
steering
Opis:
In the literature on the subject, the terms steering, management and control are often used interchangeably. However, in the course of the terminological analysis, the author indicated the dependencies between these concepts and defined the area of their application. The conducted research allowed for the identification of the concept of command and the area of its influence. The system of command, as a special (specific) form of management, allowed for the presentation of the entirety of the commander's purposeful activity as part of the command system. As a result of the terminological analysis, the author drew attention to the diversity of the analysed concepts, which will allow for their purposeful and proper use in research in the field of social sciences in the disciplines of safety science as well as management and quality science.
Źródło:
Logistics and Transport; 2021, 51-52, 3-4; 79-92
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increased accuracy of ship’s steering gear with constant delivery pump using the rudder angular velocity signal
Autorzy:
Stefanowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/135442.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
automatic control
ship steering
three-point control
dynamic correction
control of steering gear
Opis:
This article presents properties of a follow-up system executing ship’s rudder deflection using a constant delivery hydraulic pump. Furthermore, a solution is discussed which increases static and dynamic accuracy of such a system using the rudder angular velocity signal. This signal has been used for changing the level of a three-position controller insensitivity. The paper also shows the method of determination of the function describing variations of dead-zone width of the three-point controller. Two kinds of such function are shown, namely linear and quadratic. A computer model was prepared in MATLAB-Simulink environment, showing the operation of the system with correction of error signal, which carries out given by function variations of points of switching. Also included are the simulation results of the described solution, indicating a significant enhancement of accuracy of rudder angle control process for the steady state as well as during transients.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 29-33
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An electric ring thruster as auxiliary manoeuvring propulsion system for watercraft - construction analysis
Autorzy:
Matuszewski, L.
Falkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/963464.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
electric motor
steering
magnetism
ferrofluid seals
Opis:
The reported project aimed at examining properties and purposefulness of use of modern electromagnetic bearings for a screw propeller in a prototype version of a synchronous ring motor with rare earths magnets. Bearings of this type generate electromagnetic forces which keep the rotor in a state of levitation. The rotating machine with magnetic bearings can work in any environment which reveals diamagnetic properties (air, vacuum, water, liquid gases, etc.). However, a basic quality of the magnetic bearings is elimination of cooling installation and lubrication, which is necessary for proper operation of rotating machines with rolling and slide bearings, undergoing wear with time. Therefore the lifetime of the machine supported on magnetic bearings is incomparable with others. Also torque losses on this bearing are the smallest, compared to all known types of bearings. Ring thrusters can be used as the main drive for relatively small sea-going and inland vessels, and as manoeuvring drive for ships of arbitrary size, especially for AES (All Electric Ship) type vessels. This type of propeller is extremely useful for any types of abyssal vessels, autonomous and remotely controlled, and on submarines. It can also be used as effective generator of electric current for charging batteries in towing trains, barges for instance. The project consisted of three research tasks: 1. Designing, manufacturing and examination of a magnetic bearing on-line controlled by a digital controller, 2. Manufacturing a model of a ring thruster and examination of characteristics of a propeller mounted in the ring, 3. Examining the ferrofluid seal. A concept of the new thruster is a consequence of investigations carried out in Poland upon propellers and magnetic bearings in years 2001-2005.
Źródło:
Polish Maritime Research; 2007, S 1; 62-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reservations towards Steering Europe
Autorzy:
Ochmann, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1832059.pdf
Data publikacji:
2018-08-28
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
European Constitution
values
identity
philosophy
steering
Opis:
The paper poses the question of possible consequences of steering Europe and altering its cultural identity. The author examines signifcant international documents and European institutions in view of the values they inherently entail. In his analysis of the possible course of events, on the one hand, he raises the issue of the emergence of new values and a new philosophy. On the other, he points out that the process of current cultural changes and the dominance of civilization over culture may lead to unpredictable and potentially dangerous results.
Źródło:
Security Dimensions; 2013, 9(9); 5-15
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of variable input and output on the characteristics of a steering system with EPS (Electric Power System)
Autorzy:
Kuranowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/248054.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
steering electric power system EPS
research
Opis:
The complexity of the process of controlling the steering system assistance causes that the assistance units, designed as the control systems, change their characteristics depending on the frequency and amplitude of the torque applied to the steering wheel as well as on the frequency and amplitude of the force applied to the gear toothed bar. The investigation aiming to indicate this effect involved designing a special test stand enabling differentiation of the frequency and amplitude of the input functions applied to the steering wheel or to the gear-toothed bar. The results of the investigation are the characteristics diagrams and numerically determined friction force and compliance values. The test stand allows carrying out the research in two operation modes of the assistance device – normal mode and city mode as well as at simulated different driving speeds. The investigation permitted to identify the parameters of the model of a steering system with an electric assistance device. In the paper, the results of the investigation and their preliminary analysis are presented. The load input function from the side of the toothed bar showed a strong relationship between the frequency and the torque transmitted on the steering wheel. For example, high frequencies occurring during running fast through small irregularities of the road are strongly damped. The slow-variable runs are transmitted on the steering wheel as a feedback reaction.
Źródło:
Journal of KONES; 2012, 19, 1; 215-226
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autonomic logistics system of intelligent military motor vehicles
Autorzy:
Niziński, S.
Kupicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/244540.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
motor vehicles
logistics
operation
diagnostics
steering
Opis:
The paper presents a concept of autonomic logistics system of intelligent military motor vehicles. A classification of vehicles and a definition of intelligent motor vehicles has been provided. The intelligent motor vehicle distinguishes the functional components systems and the integrated control system. The integrated system has been defined to control the intelligent motor vehicles, including subsystems of: data identification, information-and-decision-making and executive components. The data identification subsystem distinguishes the following components: logistic about the state of environment, navigation, and communications. The automatic logistic system consists of the following subsystems: diagnostic, operational, security, and power supply. The purpose and tasks of those subsystems have been examined. The information and decision-making subsystem has been defined: classic, expertise, and hybrid. Tasks of the vehicle setting components subsystem have been defined. A place of autonomic logistic system in the structure of the military motor vehicle has been determined. The development of a design and the implementation of the proposed concept of the autonomic logistic system will significantly increase the performance properties of military motor vehicles in aspect of effective execution of their combat missions.
Źródło:
Journal of KONES; 2011, 18, 1; 385-394
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposal of simulation model of a wind-steering system for sailing yachts, based on single-stage servopendulum coupled with main rudder
Autorzy:
Piętak, A.
Mikulski, M.
Melzacki, M.
Czerwiński, K.
Powiązania:
https://bibliotekanauki.pl/articles/259625.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sailing yachts
wind-steering system
automation
Opis:
The aim of this study was to investigate possible application of fast design prototyping methods for wind-steering systems used in offshore sailing yachts. The development of such methods would help to speed up the construction work and reduce the scope of necessary experimental research, prior to implementation of the system. In the present work, based on an analysis of existing designs of windvane systems, a preliminary selection of the system configuration has been undertaken, in terms of a compromise between efficiency, performance, and design complexity. Construction design of a single- stage, servo – pendulum system, has been developed by using the Autodesk Inventor design package. Next, based on the design data, a simulation model of the system, has been produced by using Matlab – Simulink software and SimMechanics library. The model was further verified in terms of kinematics mapping with the use of Matlab visualization tools.
Źródło:
Polish Maritime Research; 2015, 2; 15-22
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normowanie prędkości przestawiania steru statku
Rudder deflection velocity normalisation
Autorzy:
Stefanowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/360281.pdf
Data publikacji:
2008
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
sterowanie statkiem
maszynka sterowa
prędkość wychylenia steru
normalizacja
ship steering
steering gear
rudder deflection velocity
normalisation
Opis:
W artykule przedstawiono zagadnienie normowania prędkości przestawiania steru, mając na uwadze zmniejszenie mocy maszyny sterowej i bezpieczeństwo żeglugi. Przyjęto, że bezpieczeństwo to będzie zapewnione, jeśli od rozpoczęcia manewru "ster na burtę" statek uzyska po przebyciu odcinka równego swojej długości bezwymiarową prędkość kątową równą 0,2 i po przebyciu drogi równej 1,5 swojej długości przemieszczenie boczne równe 3B (trzy szerokości). Podano przykłady obliczeniowe dla statku typu Mariner oraz sformułowano wnioski.
The paper presents a problem of rudder deflection velocity normalisation considering steering gear power reduction as well as safety of ship. It has been assumed that the following safety conditions should be fulfilled: during manoeuvre dimensionless angular velocity of hull should obtain the value of 0.2 after distance equal to hull length; after distance equal to 1.5 of length of hull, transversal displacement should be equal to 3B, where B denotes hull breadth. Examples of numerical computations for a Mariner type ship and conclusions are given.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2008, 14 (86); 43-47
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie i sterowanie rozmyte aparatem udojowym
Modeling and fuzzy steering of the milking apparatus
Autorzy:
Juszka, H.
Lis, S.
Tomasik, M.
Powiązania:
https://bibliotekanauki.pl/articles/239640.pdf
Data publikacji:
2005
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
dój maszynowy
krowa
sterowanie rozmyte
automatyczne sterowanie
modelowanie
machine milking
cow
fuzzy steering
modeling
automatic steering
simulation
Opis:
Przedstawiono modelowanie aparatu udojowego z zastosowanym sterowania opartego na logice rozmytej. Model aparatu udojowego oraz rozmyty model sterowania opracowano w programie MatlabŽ. Jego konstrukcja zawiera bloki funkcjonalne obliczające sygnał pulsatora, objętość komór pod strzykami, podciśnienie w tych komorach oraz natężenie strumienia powietrza przetłaczanego pomiędzy komorami podstrzykowymi a komorą mleczną kolektora pod wpływem różnicy podciśnień. Model umożliwia badanie przebiegów zmian podciśnienia w komorach podstrzykowych kubków udojowych i komorze mlecznej kolektora.
Paper presented modeling of the milking machine with application of steering based on fuzzy logic. The model of milking machine as well as the fuzzy model of steering were formulated under MATLAB 6,5Ž Simulink programme. Their construction included functional blocs computing the pulsator signal, the capacity of teat-cup chambers, vacuum pressure in these chambers as well as the intensity of air flow between teat-cup chambers and milking chamber of collector, forced by the difference in vacuum pressures. The model makes possible to investigate the courses of vacuum pressure changes in teat-cup chambers and milking chamber of the collector.
Źródło:
Problemy Inżynierii Rolniczej; 2005, R. 13, nr 4, 4; 57-64
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the correctness of performance of typical vehicle drive manoeuvres vs. steering effort
Autorzy:
Nogowczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/244175.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
objective function
correct execution of a manoeuvre
steering effort
steering control quality evaluation
simulation of a manoeuvre
Opis:
The paper concerns the modelling of lateral dynamics of vehicle movement. Two concepts related to vehicle steering were presented and compared with each other in this paper. One of them was related to the idea of a curvilinear motion assistance system, which might be used for automatic vehicle driving or for the correction of driver's actions. It aimed at the optimization of the steering wheel input in terms of the correctness of performance of typical manoeuvres. The other one was related to the realization of steering assistance. It concerned the evaluation of steering control guality by determination of the steering effort value. For the analysis of the correctness of typical manoeuvres performance, a double lane-change manoeuvre was chosen. To evaluate the correct performance of the manoeuvre an objective function was adopted and presented in the paper. A computer simulation oftwo examples of the typical double lane-change manoeuvre was carried out. The first example concerned an avoidance of an obstacle having suddenly sprung up and the second one concerned an avoidance of an obstacle without the element of surprise. Some examples of computer simulation results were presented and discussed in the paper.
Źródło:
Journal of KONES; 2009, 16, 1; 367-377
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the identification of the second-order linear Nomoto model from the zigzag test
Autorzy:
Artyszuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/134975.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship
manoeuvring
steering
Nomoto
linear model
zigzag
Opis:
In this paper a simple four-point, in terms of time, but eight-value in total, identification method has been developed for the second-order linear Nomoto steering model. The algorithm intrinsically uses the zigzag test data in that it inherited some principles of the well-known procedure for the first-order model, from which it is essentially derived. The performance evaluation was then conducted with both simulated and real data. However, the results of these early, unprecedented efforts are far from satisfactory. Some potential sources of difficulties have been discussed. This calls for further research and improvement in order to provide a practical application of the method.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 53 (125); 59-67
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conversion of a Second- to First-Order Linear Nomoto Model in the Light of ZigZag Manoeuvre Performance
Autorzy:
Artyszuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/320659.pdf
Data publikacji:
2018
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
zigzag test
Kempf
ship
manoeuvring
steering
Nomoto
Opis:
The problem of considerable difference between the first- and second-order linear Nomoto models is undertaken, not well covered in literature so far. If the former approximates the latter (better one, of a sound hydrodynamic interpretation) for some reasons, its parameters can not be easily derived from the other one, except for some specific rare cases. For such an identification purpose, we can use a simulated zigzag response and the classic procedure proposed by Nomoto in 1960. However, the first-order model thus developed yields somehow redefined constants against the original model, which lose their normal hydrodynamic (or kinematic) sense. In other words, it is very sensitive to the manoeuvre type on input, being therein the zigzag test. Therefore, the model is allowed to be only used for simulating motions essentially similar to the input zigzag. In other words, the identification procedure works like a blind curve-fitting and the first-order model (in contrast to second-order one) is inadequate for reflecting arbitrary manoeuvres, even for mild rudder as to be within 'linear' assumptions. This study examines systematically and in detail such an incompatibility of the first order model in that it presents the conversion charts from the standpoint of 10°/10° zigzag test matching. One can receive higher or lower values for the parameters of first-order model, versus the second-order one, depending on the T3/T2 ratio of the latter model.
Artykuł zawiera systematyczne wyniki identyfikacji liniowego modelu Nomoto pierwszego rzędu na podstawie symulowanej próby wężowej różnych wariantów modelu drugiego rzędu. W toku analizy stwierdzono ogólną nieadekwatność (strukturalną) modelu pierwszego rzędu do symulacji dowolnych manewrów, w przeciwieństwie do modelu drugiego rzędu, nawet w granicach liniowości dynamiki statku. Wyniki identyfikacji silnie bowiem zależą od rozpatrywanego manewru.
Źródło:
Annual of Navigation; 2018, 25; 187-203
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of a multi-fuel, low-power generator with a self-ignition, common rail gas engine
Autorzy:
Piętak, A.
Imiołek, M.
Imiołek, A.
Powiązania:
https://bibliotekanauki.pl/articles/247142.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dual-fuel feeding
CNG
steering
renewable fuel
Opis:
An idea of using biomass for generating electricity and heat leads to new solutions for power generators, adapted to be supplied with gaseous and liquid biofuels. At present, there is a growing interest in low-power generators. This type of energy production is termed 'scattered energy generation'. It is expected that generating energy in small units situated close to energy consumers may bring about substantial benefits. It is assumed that in a scattered energy generation system, energy will be produced from local fuels, such as broadly understood biomass as a primary component for production of gaseous and liquid biofuels to power low-power energy generators. An adequate amount of biomass must be secured to ensure that biogas can be produced all year round. The easiest way to store highly efficient biomass is to ensile maize and rye as well as grass. The amounts of biogas obtained from these two types of silage are comparable. Using rye as a renewable energy source for production of either bioethanol or biogas is economically viable for at least two reasons: rye grows on poor class soils and rye cultivation technology can be reduced to just nitrogen fertilization. In conclusion, it seems reasonable to generate energy in Poland in scattered energy generation systems from crops grown for this purpose. Currently, gas-powered engines are being in several ways.
Źródło:
Journal of KONES; 2011, 18, 4; 349-356
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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