Autor: Grzadziela, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Diagnosing of rotor systems of marine gas turbine engines in nonstationary states
Autorzy:: Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/246906.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
gas turbines
rotor vibration
run-up process
Opis:: Vibration tests of marine gas turbine engines are performed as researches on-line and off-line types. Systems on-line type generally monitored one or two vibration symptoms, which asses the limited and/or the critical values of parameters and they potentially can warn and/or shutdown engines. Systems off-line types are usually used for vibration analyzing during non-steady state of work. The paper presents comparison of different methods of analyzing vibration symptoms measured under run-up and shut-down processes of marine gas turbine engines. Results of tests were received on gas turbine engine DR76 type of the COGAG type propulsion system. The engine was not fitted with vibration monitoring system. Main goal of researches was qualified of help fulness and unequivocally results received by methods of synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas turbine engines operated in the Polish Navy, called BDS (Base Diagnosing System). Second purpose was estimation of the possibility of implementation presented methods of vibration analyses of gas turbine engines for on-line monitoring system. Application of periodical or on-line diagnostic procedures makes it possible to operate ship propulsion systems in accordance with their current technical state. The realization of the investigations made reliable verification of the investigation results possible.
Źródło:: Journal of KONES; 2010, 17, 2; 121-127
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Ship impact modeling of underwater explosion
Autorzy:: Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/242191.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ship hull
simulation
underwater explosion
Opis:: Ship shock tests have been conducted for shock qualification of hull integrity and proper operation systems and subsystems. The ship shock trial identifies design and construction and it also validates shock hardening criteria. The main problem is that ship shock trials are costly. Numerical modelling and simulation, using FEM, may provide information to look into the details of fluid model, dynamic characteristics of ship hull and its internal component. The ship shock modelling and simulation has been performed and the predicted results were compared with ship shock test data made into sea trials. The preliminary studies of shock analysis approach are presented and the important parameters are discussed. The course of pressure changes in the shock wave and the acceleration of the ship hull during an underwater explosion in a fixed point, coating elements with chosen junction forces (example), designation of degrees of freedom of rectangular plate, simplified diagram of interactions in the process of detention in the hull of a ship, analysis of the acceleration of the Newmark method, calculations based on central difference method, schematic anchor launch, layout of the apparatus and the conditions for an explosion, the course of the accelerations recorded in the ship's hull, The course of simulation of the acceleration are presented in the paper.
Źródło:: Journal of KONES; 2011, 18, 2; 145-152
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Model of impact underwater detonation
Autorzy:: Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/247855.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: technical diagnostic
modelling
vibrations
underwater explosion
simulation
Opis:: Minehunters are subjected to specific sea loads due to waving and dynamical impacts associated with underwater explosion. Sea waving can be sufficiently exactly modelled by means of statistical methods. Much more problems arise from modelling impacts due to underwater explosion. Knowledge of a character of impulse loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. The problem of influence of sea mine explosion on hull structure is complex and belongs to more difficult issues of ship dynamics. Underwater explosion is meant as a violent upset of balance of a given system due to detonation of explosives in water environment. A paper presents a proposal of identification of a degree of hazard the ship's hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modelled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software and FEM models.
Źródło:: Journal of KONES; 2012, 19, 2; 191-199
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dynamic analyses of ships shafts lines
Autorzy:: Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/241759.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
ship propulsions
dynamic analyse
propulsion system
Simulink software
Opis:: Ships' propulsion plant usually works in a hard environment caused by static forces and permanent dynamic loads. Exciding of tolerated values of shaft alignments causes a damage of radial and thrust bearings in relative short time. Modelling of dynamical reactions could bring information to the designer for recognizing the level of hazard for propulsion system. Knowledge of a character of dynamic loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. This way elimination of costly and time-consuming overhauls on dock leads to lowering operational costs and increasing ship fighting merits. A paper presents a proposal of identification of a degree of hazard to ship shaft line due to forces of shafts misalignment. A theoretical analysis was made of influence of changes in co - axiality of shafts resulting from elastic deformations of hull structure in vicinity of shaft bearing foundations. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modelled signals were recognized within sensitive symptoms of two sub models: model of propulsion system and model of shaft's misalignment. Both sub models allow testing forces and their responses in vibration spectrum using SIMULINK software.
Źródło:: Journal of KONES; 2008, 15, 4; 163-170
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dynamic problems of propulsion system of naval vessels
Autorzy:: Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/243409.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ship shaft lines
technical diagnostics
modelling
vibrations
underwater explosion
Opis:: Ship propulsion systems are subjected to specific sea loads due to waving and dynamical impacts associated with mission of a given ship. Sea waving can be sufficiently exactly modelled by means of statistical methods. Knowledge of a character of impulse loading which affects ship shaft line can makes possible identifying potential failures by means of on-line vibration measuring systems. The modelling of impulse impact form and next its identification makes possible identification of explosion power, distance from explosion epicentre, a kind of explosion, elastic or plastic deformation of shaft line. The presented results related to the performed experimental test do not make possible assigning unambiguously the modelled signal features to those of the recorded ones during the real test. Analysis of forces acting on shaft-line bearings, problems of underwater explosion, and models of excitation due to underwater explosion has been described in the paper. In particularly simulated static bending stresses in propeller shaft due to weight of propeller, a simplified shaft-line model for critical speed calculation, run of changes of shock wave pressure and ship hull acceleration measured on hull surface during underwater explosion, schematic diagram of the performed experimental test, run of the assumed vibration acceleration model, spectrum of the assumed vibration acceleration model are represented.
Źródło:: Journal of KONES; 2007, 14, 3; 195-202
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Vibration diagnostics of marine gas turbine engines
Autorzy:: Grządziela, A.
Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/244616.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
gas turbines
rotor vibration
Opis:: Vibration tests of marine gas turbine engines are performed as researches on-line and off-line types. The paper presents analyses of both methods. Results of tests were received on three types of gas turbine engines operated in the COGAG type propulsion systems. The application of periodical diagnostic procedures or on-line monitoring systems makes it possible to operate ship propulsion systems in accordance with their current technical state. In the case of ship gas turbines the hourly period of scheduled maintenance or repair surveys is presently the criterion for maintenance time determination. The Finite Element Analysis (FEA) is used for confirmation actual technical state. FEA are used successfully for a wide range of problems and it may also be used for the modelling and analysis of rotor system. Presently, the diagnostics team uses FEA and the modelling of rotordynamics in conjunction with vibration analysis for detection and identification of unbalancing. Main goal of researches was qualified of helpfulness and unequivocally results received by methods of synchronous measurement, order tracking and auto tracking. All vibration symptoms were chosen from the methodology of the diagnosing gas turbine engines operated in the Polish Navy, called BDS (Base Diagnosing System). This element of BDS is accepted and used in all ships of Polish Navy, which are powered by the COGAG power plant. Second purpose of researches was estimation of the possibility of implementation presented methods of vibration analyses of gas turbine engines fornew, modern on-line monitoring system. The proposed diagnostics method makes it possible to determine the limiting value of vibration symptoms witch, if exceeded, indicates the inadmissible axis slope value between rotated machines of gas turbine engine and, more-over, it provides an unambiguous relationship between the value of symptom of rotors unbalance and the rotors rotational speed.
Źródło:: Journal of KONES; 2011, 18, 1; 157-162
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Identification of the ship's hull impact load on the base on the power transmission system's vibrations measurements
Identyfikacja obciążenia udarowego kadłuba okrętu na podstawie pomiaru drgań układu napędowego
Autorzy:: Dąbrowski, Z.
Grządziela, A.
Powiązania:: https://bibliotekanauki.pl/articles/244379.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modelowanie systemów dynamicznych
eksplozja podwodna
układ napędowy
dynamic systems modelling
underwater explosion
power transmission system
Opis:: The following paper presents the results of an experiment in which an influence of underwater explosions on the ship's power transmission system dynamics was measured. The results, obtained for two different configurations of the object's position and the explosion's place, were compared. The experiment was conducted while the power transmission system was working, so that it was possible to define the relation between a hull's impact load and the vibrations ofpropeller shaft's bearings. As a result of this research, the methodology of measurements and signal analysis has been elaborated and, in consequence, the obtained data can be used to improve an vibroacoustic diagnostic system working on-line. Localisation of the explosives, the configuration of measurements points, measuring time before and after explosion, the comparing of the signal analysis using RMS and Peak value of the acceleration, the comparing of the signal analysis results in two frequency bands, the comparing of the signal analysis results, the comparing of the two explosion effects, the comparing of the two explosion effects are presented in the papers.
W artykule przedstawiono wyniki eksperymentu w którym badano wpływ wybuchów podwodnych na dynamikę układu napędowego okrętu. Porównano wyniki dla dwóch różnych usytuowań obiektu w stosunku do miejsca eksplozji. Eksperyment wykonano podczas pracy układu napędowego, co pozwoliło określić wpływ impulsowego obciążenia kadłuba na drgania łożysk wału śrubowego. Efektem badań jest opracowanie metodyki pomiaru i analizy sygnału wibroakustycznego pozwalającej na wykorzystanie uzyskanych danych do doskonalenia drganiowego systemu diagnostycznego pracującego w systemie (trybie) on-line. Schemat rozmieszczenia ładunków w trakcie badań, rozmieszczenie punktów pomiarowych, zakres czasu pomiaru przyspieszeń przed i po detonacji, porównanie wyników analiz pulsacji pęcherzy przy wykorzystaniu wartości szczytowej i wartości skutecznej przyspieszeń porównanie analiz przy różnych zakresach częstotliwości, porównanie analiz porównanie oddziaływań dla detonacji, porównanie oddziaływań dla detonacji, są przedstawione w artykule.
Źródło:: Journal of KONES; 2007, 14, 4; 67-74
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: An application of order tracking procedure for diagnosis technical state of rotor system in shut - down process
Autorzy:: Grządziela, A.
Kluczyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/242634.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
vibration
gas turbines
rotor vibration
shut-down process
order analysis
Opis:: Vibration diagnostic tests of marine gas turbine engines are performed as a research of on-line and off-line types. On-line systems generally monitored one or two vibration symptoms, which asses the limited and/or the critical values of parameters and they, potentially, can warn and/or shutdown engines. Off-line Systems are usually used for vibration analysis during non-steady state of work. The paper presents a new method of vibration diagnostics of rotor bearing system of gas turbine systems. The study assumes implementation of characteristics of vibration signals during the shut-down process of the rotor. The shut-down process is non-stationary so the studies used the order tracking procedure. Identified orders constitute individual characteristics as a function of changes of the rotational speed and shut-down process time. These allow the observation of changes in the support rigidity of the rotor in the frequency domain and change the bearing resistance torque as a function of changing time of the shut-down process. The resulting characteristics are as reference fingerprints for each of the rotors. Changes in the characteristics of the primary evidence of the processes of wear. Changes in the stiffness of rotor supports make change the amplitude of orders and frequency of the resonance signals observed in the frequency domain - decreasing rotational speed. The bearing wear results in changes in the shut-down time between successive intervals of characteristic rotational speed and the total shut-down time.
Źródło:: Journal of KONES; 2013, 20, 1; 111-118
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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