Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "laser simulation" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 28
Tytuł:
Modelling and characterization of laser welded incoloy 800 HT joints
Autorzy:
Arun Kumar, S.
Paulraj, S.
Powiązania:
https://bibliotekanauki.pl/articles/102190.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
incoloy 800 HT
laser welding
modeling and simulation
mechanical and metallurgical characteristics
Opis:
This study aims at finding the effect of laser welding speed on incoloy 800 HT. This alloy is one of the potential materials for Generation IV nuclear plants. Laser welding has several advantages over arc welding such as low fusion zone, low heat input and concentrated heat intensity. Three different welding speeds were chosen and CO2 laser welding was performed. 2D modeling and simulation were done using ANSYS 15 to find out the temperature distribution at different welding speeds and it was found that an increase in the welding speed decreased the temperature. Mechanical properties such as tensile strength, toughness and hardness were evaluated. The effect of welding speed on metallurgical characteristics was studied using optical microscopy (OM), Scanning Electron Microscopy (SEM) with EDS, X-Ray Diffraction (XRD) technique and fractographic analysis. From the results it was found that high welding speed (1400 mm/min) decreased the joint strength. The M23C6 and Ni3Ti carbides were formed in a discrete chain and in a globular form along the grain boundaries of the weld region which increased the strength of the grain boundaries. Fractographic evaluations of the tested specimens for welding speed (1000 and 1200) mm/min showed deep and wide dimples indicating ductile failures.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 30; 115-126
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Desorption/ablation of lithium fluoride induced by extreme ultraviolet laser radiation
Autorzy:
Blejchař, T.
Nevrlý, V.
Vašinek, M.
Dostál, M.
Kozubková, M.
Dlabka, J.
Stachoň, M.
Juha, L.
Bitala, P.
Zelinger, Z.
Pira, P.
Wild, J.
Powiązania:
https://bibliotekanauki.pl/articles/146227.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
desorption
fluid dynamics
lithium fluoride
numerical simulation
plume expansion
pulsed laser ablation
Opis:
The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoridetargets irradiated by the intense photon beams is essential for many practical aspects. This study is motivated by the practical implementation of soft X-ray (SXR) or extreme ultraviolet (XUV) lasers for the pulsed ablation and thin fi lm deposition. Specifically, it is focused on quantitative description of XUV laser-induced desorption/ablation from lithium fluoride, which is a reference large band-gap dielectric material with ionic crystalline structure. Computational framework was proposed and employed here for the reconstruction of plume expansion dynamics induced by the irradiation of lithium fluoridetargets. The morphology of experimentally observed desorption/ablation craters were reproduced using idealized representation (two-zone approximation) of the laser fluence profile. The calculation of desorption/ablation rate was performed using one-dimensional thermomechanic model (XUV-ABLATOR code) taking into account laser heating and surface evaporation of the lithium fluoridetarget occurring on a nanosecond timescale. This step was followed by the application of two-dimensional hydrodynamic solver for description of laser-produced plasma plume expansion dynamics. The calculated plume lengths determined by numerical simulations were compared with a simple adiabatic expansion (blast-wave) model. The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoridetargets irradiated by the intense photon beams is essential for many practical aspects. This study is motivated by the practical implementation of soft X-ray (SXR) or extreme ultraviolet (XUV) lasers for the pulsed ablation and thin fi lm deposition. Specifically, it is focused on quantitative description of XUV laser-induced desorption/ablation from lithium fluoride, which is a reference large band-gap dielectric material with ionic crystalline structure. Computational framework was proposed and employed here for the reconstruction of plume expansion dynamics induced by the irradiation of lithium fluoridetargets. The morphology of experimentally observed desorption/ablation craters were reproduced using idealized representation (two-zone approximation) of the laser fluence profile. The calculation of desorption/ablation rate was performed using one-dimensional thermomechanic model (XUV-ABLATOR code) taking into account laser heating and surface evaporation of the lithium fluoridetarget occurring on a nanosecond timescale. This step was followed by the application of two-dimensional hydrodynamic solver for description of laser-produced plasma plume expansion dynamics. The calculated plume lengths determined by numerical simulations were compared with a simple adiabatic expansion (blast-wave) model.
Źródło:
Nukleonika; 2016, 61, 2; 131-138
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of laser and variable magnetic field simulation on amaranth seeds germination
Autorzy:
Dziwulska-Hunek, A
Kornarzynski, K.
Matwijczuk, A.
Pietruszewski, S.
Szot, B.
Powiązania:
https://bibliotekanauki.pl/articles/26336.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
laser
magnetic field
simulation
amaranth
seed germination
germination temperature
Źródło:
International Agrophysics; 2009, 23, 3; 229-235
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new BEM for modeling and simulation of 3T MDD laser-generated ultrasound stress waves in FGA smart materials
Autorzy:
Fahmy, Mohamed A.
Powiązania:
https://bibliotekanauki.pl/articles/29520102.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
oundary element method
modeling and simulation
three-temperature
memory-dependent derivative
laser ultrasonic
nonlinear thermal stress waves
functionally graded anisotropic
smart materials
Opis:
The goal of this study is to present a new theory known as the three-temperature memory-dependent derivative (MDD) of ultrasound stress waves in functionally graded anisotropic (FGA) smart materials. It is extremely difficult to address the difficulties related to this theory analytically due to its severe nonlinearity. As a result, we suggest a new boundary element method (BEM) to solve such equations. The suggested BEM technique incorporates the benefits of both continuous and discrete descriptions. The numerical results are visually represented to demonstrate the impacts of MDD three temperatures and anisotropy on the ultrasound stress waves in FGA smart materials. The numerical findings verify the proposed methodology’s validity and accuracy. We may conclude that the offered results are useful for comprehending the FGA smart materials. As a result, our findings contribute to the advancement of the industrial applications of FGA smart materials.
Źródło:
Computer Methods in Materials Science; 2021, 21, 2; 95-104
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of a micro-channel heat sink for cooling of high-power laser diode arrays
Autorzy:
Furmański, P.
Thualfaqir, K.
Łapka, P.
Powiązania:
https://bibliotekanauki.pl/articles/240825.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
micro heat sink
laser diode arrays cooling
numerical simulation
chłodzenie
laser
dioda
radiator
modelowanie numeryczne
Opis:
Micro-channel heat sinks are used in a wide variety of applications, including microelectronic devices, computers and high-energy-laser mirrors. Due to the high power density that is encountered in these devices (the density of delivered electrical power up to a few kW/cm2 ) they require efficient cooling as their temperatures must generally not exceed 100 °C. In the paper a new design for micro-channel heat sink (MCHS) to be used for cooling laser diode arrays (LDA) is considered. It is made from copper and consisting of 37 micro-channels with length of 9.78 mm, width of 190 µm and depth of 180 µm with the deionized water as a cooling medium. Mathematical and numerical models of the proposed design of the heat sink were developed. A series of thermofluid numerical simulations were performed for various volumetric flow rates of the cooling medium, its inlet temperature and different thermal power released in the laser diode. The results show that the LDA temperature could be decreased from 14 to 17% in comparison with earlier proposed design of the heat sink with the further drop in temperature obtained by applying indium instead of gallium arsenide as the soldering material between the LDA and MCHS interface. Moreover, it was found that the maximum temperature, and therefore the thermal resistance of the considered heat sink, could be decreased by increasing the coolant flow rate.
Źródło:
Archives of Thermodynamics; 2018, 39, 3; 15-27
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania lotu przeciwpancernego pocisku kierowanego Pirat z funkcją „top attack”
Investigations of the PIRAT Anti-tank Guided Missile Flight with the „Top attack” Function
Autorzy:
Gołoś, Damian
Zawada, Paweł
Noga, Janusz
Motyl, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27314944.pdf
Data publikacji:
2023
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
sterowanie lotu pocisku rakietowego
symulacja komputerowa
przeciwpancerny pocisk kierowany
naprowadzanie laserowe
missile flight control
computer simulation
anti-tank guided missile
laser guidance
Opis:
W niniejszej pracy przedstawiono budowę i zasadę działania przeciwpancernego pocisku kierowanego Pirat z funkcją „top attack”. Pocisk przeszedł pomyślnie testy na stanowisku laboratoryjnym oraz testy poligonowe. Przedstawiono również wyniki badań symulacyjnych lotu pocisku Pirat, które porównano z wynikami badań poligonowych. Badania symulacyjne przeprowadzono w oparciu o opracowany model matematyczno-fizyczny pocisku. Uzyskane wyniki potwierdzają poprawność założeń i charakterystyk przyjętych w modelu symulacyjnym.
The paper presents the structure and principle of operation of the PIRAT anti-tank guided missile (ATGM) with the „top attack” function. PIRAT is a light anti-tank missile guided to the target using Semi-Active Laser Homing (SALH) method. A system maximum range is 2500 m. The missile has successfully passed laboratory and field tests. The results of the PIRAT missile flight simulation tests have been presented and compared with the results of field tests. The simulation tests were carried out on the basis of the created mathematical and physical models of the missile. The obtained results confirm the correctness of the assumptions and characteristics adopted for the simulation model. A distance between a missile launcher and a target during field test, presented in the paper, was 2400 m. Missile behaviour in flight was consistent with the simulation results, what is shown in figures 9, 10, and 11. The velocity of the projectile throughout the flight was sufficient to provide adequate control force. The velocity vector of the projectile at the moment of impact with the target is inclined to the horizontal plane at an angle of -26ᵒ. Approximately 0.2 s before missile hitting the target, an inclination angle of the projectile body was -35ᵒ. This is due to high value of control command signal developed by the autopilot at that moment. In the actual moment of missile hitting, the target value of control command signal was low causing a change of an inclination angle of the projectile body up to the value of -23ᵒ. It is advisable to modify the PIRAT’s missile control algorithm to increase an inclination angle of the velocity vector at the moment of missile hitting the target, as well as to increase an angle of inclination of the missile body when it hits the target.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2023, 14, 3 (53); 9--24
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital factory
Autorzy:
Gregor, M.
Medvecky, S.
Matuszek, J.
Stefanik, A.
Powiązania:
https://bibliotekanauki.pl/articles/384663.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
digital factory
reverse engineering
simulation
3D laser scanning
Opis:
The paper presents the results of research and development of the Digital Factory solutions in industry. The implementation of this technology in industry is described and discussed. The results of research and development cover design of assembly system, its processes, simulations model, ergonomic analysis etc. In the paper are presented the solutions developed in the framework of co-operation with industrial partners like Volkswagen Slovakia, Thyssen Krupp - PSL, Whirlpool. The paper contains results of research realized in 3D laser scanning and digitization of large size objects of the current production systems. The developed and validated methodology shows the procedure of 3D laser scanning application by the digitization of production halls, machine tools, equipment, etc. This procedure was tested and validated in chosen industrial companies. The paper presents achieved benefits and future research goals as well.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 3; 123-132
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of through transmission laser welding of Nylon6 by finite element simulation
Autorzy:
Gupta, S. K.
Pal, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/407048.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser transmission welding
simulation
through transmission laser welding
glass transition temperature
finite element method
Opis:
Over the years laser welding has evolved as a fabrication process capable of overcoming the limitations of conventional joining methodologies. It facilitates the welding of diverse range of materials like metals, non-metals, polymers etc. Laser transmission welding is a technique employed for fabricating intricate shapes/contours in polymers with better precision compared to the other conventional processes. Nylon6, a synthetic semi-crystalline polymer is utilized as an engineering thermoplastic due to its high strength and temperature resistant properties. In the earlier researches, various welding techniques were employed for the fabrication of polymers and metals keeping the laser beam stagnant, and much emphasis was given only to temperature distribution along the different axes and limited attention was given to residual stress analysis. Therefore, in this research work, a three-dimensional time-dependent model using a moving laser beam is used to fabricate unreinforced Nylon6 specimens.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 56-69
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot electron refluxing in the short intense laser pulse interactions with solid targets and its influence on K-α radiation
Autorzy:
Horný, W.
Klimo, O.
Powiązania:
https://bibliotekanauki.pl/articles/148753.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron recirculation
electron refluxing
K-α radiation
laser–plasma interactions
particle-in-cell simulation
Opis:
Fast electrons created as a result of the laser beam interaction with a solid target penetrate into the target material and initialize processes leading to the generation of the characteristic X-ray K-α radiation. Due to the strong electric field induced at the rear side of a thin target the transmitted electrons are redirected back into the target. These refl uxing electrons increase the K-α radiation yield, as well as the duration of the X-ray pulse and the size of the radiation emitting area. A model describing the electron refl uxing was verifi ed via particle- -in-cell simulations for non-relativistic electron energies. Using this model it was confi rmed that the effect of the electron refluxing on the generated X-ray radiation depends on the target thickness and the target material. A considarable increase of the number of the emitted K-α photons is observed especially for thin targets made of low-Z materials, and for higher hot electron temperatures.
Źródło:
Nukleonika; 2015, 60, 2; 233-237
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements and numerical simulations of laser hardening and remelting thermal cycles
Autorzy:
Kik, T.
Wyględacz, B.
Powiązania:
https://bibliotekanauki.pl/articles/368669.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
hardening
remelting
WCL steel
diode laser
thermal cycle
SYSWELD
numerical simulation
hartowanie
przetapianie
stal WCL
laser diodowy
obieg cieplny
symulacja numeryczna
Opis:
Purpose: of these researches was to investigate the influence of thermal cycles recording conditions and comparing them with the calculated by FEM. This approach allows proposing a new way of determining the technological conditions of the process, based on numerical analyses. Design/methodology/approach: Thermal cycles of high power diode laser hardening and remelting was recorded and calculated by FEM. Results of metallographic examinations were compared with numerical simulations results, as well as the thermographic pictures. Acquisition errors during the thermal cycles were also defined. Findings: Due to the fact that the it was used FEM, comparison of the numerical analyses with real test results was performed for laser hardening and remelting process. Research limitations/implications: For complete information it is needed to collect bigger database of the results and prepare also hardness calculation model for WCL steel. Practical implications: The result of the presented work is to signal a methodology that allows obtaining information on the impact of the parameters of the laser hardening and remelting process on the properties of the treated samples. Not without significance is the fact that the use of FEM eliminates in this case a lot of errors that in real tests can distort the result. Originality/value: The researches were provided for high power diode laser hardening and remelting. The influence of heat input on layers properties and theirs structure was defined. Results were compared with thermographic pictures and calculated cases.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 96, 2; 69-82
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Reflected and Scattered Laser Radiation for Designing Laser Shields
Autorzy:
Konieczny, P.
Wolska, A.
Świderski, J.
Zając, A.
Powiązania:
https://bibliotekanauki.pl/articles/89749.pdf
Data publikacji:
2008
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
biological and safety aspects of laser radiation
shield angle
computer simulation
measurements of reflected and scattered laser radiation
Opis:
This paper presents a computer simulation of reflected and scattered laser radiation for calculating the angle of laser shields performed with the Laser Shield Solver computer program. The authors describe a method of calculating the shield angle for laser shields which protect workers against reflected and scattered laser radiation and which are made from different materials. The main assumptions of the program, which calculates and simulates reflected laser radiation from any material and which can be used for designing shield angles, are presented. Calculations are compared with measurements of reflected laser radiation. The results for one type of laser and different materials which interacted with a laser beam showed that the Laser Shield Solver was an appropriate tool for designing laser shields and its simulations of reflected laser radiation distribution have practical use.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2008, 14, 2; 133-147
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projektowanie i analiza zastosowań technologii napawania laserowego dla branży lotniczej
Design and applications analysis of laser cladding technology for aviation industry
Autorzy:
Koruba, P.
Boratyński, T.
Jurewicz, P.
Koenig, G.
Szaroleta, M.
Reiner, J.
Chlebus, E.
Dworak, A.
Powiązania:
https://bibliotekanauki.pl/articles/196179.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
komputerowe wspomaganie procesów
symulacje multifizyczne
powłoki funkcjonalne
regeneracja łopatek
napawanie hybrydowe
computer aided process development
multiphysics simulation
functional coating
repair of turbine blades
hybrid laser cladding
Opis:
Technologia napawania laserowego polega na wykorzystaniu wiązki laserowej celem precyzyjnego nałożenia warstwy materiału o podwyższonych właściwościach na podłoże. Szczególne zainteresowanie budzi ona w branży lotniczej. Odpowiednie przygotowanie procesu wiąże się z wykonaniem testów symulacyjnych z wykorzystaniem modeli przepływu dwufazowego oraz interakcji wiązki laserowej z materiałem. Następnie zostają wyznaczone ścieżki ruchu głowicy przy użyciu dedykowanych narzędzi CAD/CAM. W ramach analizy technologii napawania laserowego dla zastosowań branży lotniczej przedstawiono nakładanie powłok funkcjonalnych, będących alternatywą dla chromu elektrolitycznego. Przeanalizowano również metodę regeneracji wierzchołka łopatki turbiny silnika odrzutowego. Zaprezentowano też możliwości obróbki hybrydowej w wytwarzaniu przyrostowym tytanowych komponentów lotniczych oraz metodę monitorowania temperatury celem jakościowej kontroli procesu.
The laser cladding technology consists of the use of laser beam for precise deposition of a material layer with enhanced properties to the substrate. Therefore it finds special interest in the aviation industry. Appropriate preparation of the process involves performing simulation tests using two-phase flow models and laser beam interaction with material. Subsequently, the laser head movement paths are determined using dedicated CAD/CAM software. In the analysis of laser cladding technology applications for the aviation industry, the deposition of functional coatings, being an alternative to electrolytic chromium, was presented. Secondly, the repair of turbine blade tip was also analyzed. Moreover the capabilities of hybrid laser cladding technology with machining for the additive manufacturing aviation components made of titanium alloys were presented, as well as the method of temperature monitoring for the purpose of qualitative process control implementation.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 3; 309-321
0209-2689
2300-5211
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation the finite element method (FEM) of stress and strain for the chosen coatings TBCs on turbine blades loaded with laser impulses
Autorzy:
Kosiuczenko, K.
Napadłek, W.
Powiązania:
https://bibliotekanauki.pl/articles/248121.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
superalloy ŻS6K-WI
laser ablation
numerical simulation MES
Opis:
This paper presents the results of laser ablation the barrier coating TBCs (Al2O3, ZrO2) generated on aircraft engine turbine blade made for nickel base alloy ŻS6K-- WI. Authors used neodymium impulse Nd: YAG laser, radiation with a wavelength of 1064 nm. In parallel with the laboratory experiment was performed numerical simulation of laser ablation. FEM simulation results were used for to choose the relevant laser parameters (impulse duration, impulse shape and course in time, power density) and to identify the temperature distribution heat fluxes and the state of stress and strain in the critical zones of the barrier coating TBCs. The simulation was carried out using the finite element method program LS-Dyna. On the basis of numerical simulation shown the influence of the impact layer TBCs as a thermal insulation and shown place the appearance of destructive deformation. Defined distributed tension as a function of time and estimated time destruction parts the barrier layer during the laser ablation micromachining. Model 3D of the engine turbine blades DV - 2, Analyzed piece of blade, physical model, temperature maps, maps of the reduced stress are presented in the paper
Źródło:
Journal of KONES; 2012, 19, 1; 183-186
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The numerical - experimental analysis of ablative laser cleaning nickel - based superalloy
Autorzy:
Kosiuczenko, K.
Napadłek, W.
Powiązania:
https://bibliotekanauki.pl/articles/248048.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
superalloy ŻS6K-WI
laser ablation cleaning
numerical simulation MES
Opis:
The results of simulation the laser ablation cleaning for the surface of samples made for nickel-based superalloy ŻS6K-WI. this material is use to produce the first-degree blades of aircraft engine turbines. The laboratory investigations were used pulse neodymium laser Nd: YAG and laser ytterbium Nd: Y3Al5O12. In parallel with the experiment was performed numerical simulation of ablation process. The simulation results were used for selection of appropriate laser parameters (duration, pulse form and the course of pulse in time, power density). the short time of the phenomenon of ablation process (similar to 10 ns), the authors have chosen the finite element method (FEM) contained in the LS-Dyna. Since it is known that, the rate of thermal deformation is very large, for modelling the material properties of the material model was used Thermal-Elastic-Plastic. So chosen material model allows the dependence of material parameters (E, alfa, ni, Re, ET, Cp, k) on temperature. Scheme of laser ablation, diagram of laser power density, physical model, identification depth of the ablation, area where the temperature exceeded the melting temperature, in successive moments of loading are presented in the paper.
Źródło:
Journal of KONES; 2012, 19, 1; 187-190
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the efficiency of active control system for aerial bomb
Autorzy:
Kowaleczko, G.
Żyluk, A.
Pietraszek, M.
Wijaszka, M.
Powiązania:
https://bibliotekanauki.pl/articles/244285.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
simulation
PID controller
laser-guided bombs
Opis:
The article presents the results of numerical simulation of a laser-guided bomb, which is dropped in calm weather conditions. The prototype of such a bomb was developed at the Air Force Institute of Technology. It was a result of the modification process of the classical training bomb. The modification consisted of building on the bomb's board a detection system to track targets that are designated by laser and a control system to adjust bomb’s glide path to precisely strike the target. In the simulation research, geometric and mass characteristics of the classical training bomb were used. Aerodynamic characteristics of the bomb have been determined using commercial software PRODAS. Using the mathematical model of the bomb spatial motion and model of the laser detection system series of simulations were performed. The main goal was to determine the effectiveness of the adopted construction solution. Therefore, simulations were performed for various initial positions of the bomb and fixed position of the target. It allowed finding the set of control laws coefficients giving the most accuracy of the bomb. The influence of structural modifications of the detection system on the possibility of effective detection and location of the target was also investigated. In the article, exemplary results of numerical calculations performed with the author's software are also shown.
Źródło:
Journal of KONES; 2018, 25, 4; 165-174
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies