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Wyświetlanie 1-5 z 5
Tytuł:
Research on drum water level control of marine auxiliary boiler based on ADRC
Autorzy:
Gan, H.
Lv, B.
Powiązania:
https://bibliotekanauki.pl/articles/258530.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ADRC
robustness
adaptability
drum water level
marine auxiliary boiler
Opis:
SThe active disturbance rejection control (ADRC) exhibits strong robustness and adaptability in the presence of strong interference of a large class of uncertain systems. In order to better control the water level of the auxiliary boiler drum, this paper applies the ADRC to improve its control precision, robustness and timeliness. Firstly, the change of drum water level in a large oil tanker auxiliary boiler is analyzed and the dynamic equation is established. After the mathematic changes, the dynamic equation is transformed into a two-order system. Aiming at the characteristics of nonlinear, time-varying and strong disturbance of the boiler water level control system in marine auxiliary boiler, studying the ADRC that includes tracking differentiator (TD), extended state observer (ESO), nonlinear feedback (NLSEF) and disturbance compensation of four parts. The establishment of two kinds of two-order ADRC controller to control the drum level. Through the theoretical analysis and simulation experiment test, and comparing with the cascade control strategy, the experimental results show that the active disturbance rejection controller satisfies the steady state response index of the system, and has good timeliness and accuracy to the control of water level of the drum.
Źródło:
Polish Maritime Research; 2018, S 2; 35-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies of the seatings of propulsion plants and auxiliary machinery on chocks made of metal and cast of resin. Part I. Mounting on steel chocks
Autorzy:
Grudziński, Paweł
Konowalski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/259896.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sea-going ships
propulsion plants
auxiliary machinery
seating
bolted joints
chocks
Opis:
This paper presents a description and the results of experimental studies of the deformation, friction and structural damping occurring in foundation bolted joints of propulsion plant components and auxiliary machinery that is rigidly mounted on sea-going ships. The rigid mounting of these devices to the ships’ structural foundations can be implemented in a traditional way, i.e. on chocks made of metal (usually of steel), or in a modern way, i.e. on chocks cast of resin, specially designed for this purpose. The main goal of this study is to perform a comparative analysis of these two solutions and to give a scientific explanation for why chocks cast of resin perform better in machinery seatings than the steel chocks traditionally used for this purpose. The paper consists of two parts. Part I presents the details of the rigid mountings of machinery to the foundations, and contains the results of experimental studies performed on a model of a foundation bolted joint with a traditional steel chock. Part II contains the results of similar studies carried out for a model of a bolted joint with a modern chock cast of resin. Next, a comparative analysis and evaluation of the results obtained for both investigated bolted joints was carried out, and conclusions were formulated to highlight important aspects of the problem from the point of view of science and engineering practice.
Źródło:
Polish Maritime Research; 2019, 4; 142-148
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies of the seatings of propulsion plantsand auxiliary machinery on chocks made of metal and cast from resin. Part II. Mounting on cast resin chocks
Autorzy:
Grudziński, Paweł
Konowalski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/259948.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sea-going ships
propulsion plants
auxiliary machinery
seating
bolted joints
chocks
Opis:
This article is Part II of the paper containing a description and results of the experimental studies of the deformations, friction processes and structural damping that occur in the foundation bolted joints of propulsion plant components and auxiliary machinery installed on sea-going ships. Part I of this research work presents an analysis of the rigid mountings of machines and devices to the foundations on steel or resin chocks, and explains the need to carry out relevant research in this area. It also presents the description and results of experimental studies carried out for a foundation bolted joint with a conventionally used steel chock. Part II (this article) contains a description and results of similar studies carried out for a foundation bolted joint with a modern chock – cast from epoxy resin compound (EPY), specially developed for this purpose. Then, a comparative analysis of the results obtained for both bolted joints in question was made and the foundation chocks of the poured-in-place resin compound were demonstrated to better fulfill their technical tasks than the steel chocks traditionally used for this purpose.
Źródło:
Polish Maritime Research; 2020, 1; 126-133
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ parametrów zewnętrznych na wytwarzanie pary w kotle opalanym
Autorzy:
Kreft, Dominik
Powiązania:
https://bibliotekanauki.pl/articles/2073464.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
kotły okrętowe
kocioł opalany
kocioł pomocniczy
statystyka
ship boiler
fired boiler
auxiliary boiler
statistics
Opis:
W artykule przedstawiono analizę statystyczną wpływu parametrów zewnętrznych na strumień ciepła zawartego w paliwie dolotowym do okrętowego kotła opalanego. Jako parametry niezależne wytypowano średnią dobową moc chwilową silnika głównego i agregatów prądotwórczych, temperaturę wody zaburtowej oraz zanurzenie. Analizę przeprowadzono dla czterech różnych stanów eksploatacyjnych badanego statku.
Źródło:
Journal of Polish CIMEEAC; 2021, 16, 1; 63--70
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water entry of a wedge into waves in three degrees of freedom
Autorzy:
Sun, Shi Yan
Chen, Hai Long
Xu, Gang
Powiązania:
https://bibliotekanauki.pl/articles/259045.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
water entry
nonlinear waves
three degrees of freedom
boundary element method
auxiliary function method
Opis:
The hydrodynamic problem of a two-dimensional wedge entering into a nonlinear wave in three degrees of freedom is investigated based on the incompressible velocity potential theory. The problem is solved through the boundary element method in the time domain. To avoid numerical difficulties due to an extremely small contact area at the initial stage, a stretched coordinate system is used based on the ratio of the Cartesian system in the physical space to the distance travelled by the wedge in the vertical direction. The mutual dependence of body motion and wave loading is decoupled by using the auxiliary function method. Detailed results about body accelerations, velocities and displacements at different Froude numbers or different waves are provided, and the mutual effect between body motion and wave loading is analysed in depth.
Źródło:
Polish Maritime Research; 2019, 1; 117-124
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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