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Tytuł:
Laserowe stanowisko symulacyjne mili pomiarowej
Measured mile laser simulation post
Autorzy:
Panasiuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/315908.pdf
Data publikacji:
2013
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
mila pomiarowa
laserowe stanowisko symulacyjne
model redukcyjny
measured mile
laser simulation
scale model
Opis:
Artykuł zawiera przedstawienie laserowego stanowiska pomiarowego imitującego Milę Pomiarową w warunkach laboratoryjnych. Poruszono podstawy teoretyczne pomiarów prędkości okrętu i ich odniesienie do modelu. Przedstawione zostały także wyniki pomiarów prędkości modelu redukcyjnego na basenie pomiarowym dla wybranych warunków.
Paper presents the measured mile full imitation post in laboratory conditions. Theoretical base of ship speed measurement in relate to model was also included. Author presents some model speed measurement results on maneuvering pool for selected conditions.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 1873-1883
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design, Research and Practical Implementation of the Laser Shooting Simulation System for 5.56 mm G-36, 7.62 mm FN MAG and 84 mm Carl Gustaf
Autorzy:
Fedaravičius, A.
Survila, A.
Patašienė, L.
Sližys, E.
Powiązania:
https://bibliotekanauki.pl/articles/403753.pdf
Data publikacji:
2016
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanics
armed forces
weapons
dynamical models
practise range
mechanika
wojsko
broń
modele dynamiczne
zakres praktyki
Opis:
Riflemen’s trainers are efficiently applied for the training of the armed forces, police, and shooting sportsmen. However, the training quality directly depends on the perfection of trainers as well as on their functional facilities. One of them is the shooting possibility by using various weapons. The new modification of a practise range is created: it’s included three types of weapons imitators for 5.56 mm G-36 assault rifle, 7.62 mm FN MAG machine gun and, 84 mm CARL GUSTAF recoilless gun. The work presents the universal dynamical and mathematical models of the one way operation pneumatic drive for recoil imitation, results of its investigation and description of the new modification of laser range for riflemen.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2016, 7, 2 (24); 7-18
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of the laser welding
Symulacja procesu laserowego spawania
Autorzy:
Siwek, A.
Powiązania:
https://bibliotekanauki.pl/articles/305496.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
obróbka laserowa
komputerowa dynamika płynów
efekt Marangoniego
przemiany fazowe
kształt strefy przetopionej
laser treatment
computational fluid dynamics (CFD)
Marangoni effect
metallurgical transformation
geometry of the melted zone
Opis:
The model takes into consideration thermophysical and metallurgical properties of th remelting steel, laser beam parameters and boundary conditions of the process. As a result of heating the material, in the area of laser beam operation a weld pool is being created whose shape and size depends on convection caused by the Marangoni force. The direction of the liquid stream depends on the temperature gradient on the surface and on the chemical composition as well. The model created allows to predict the weld pool shape depending on material properties, beam parameters, and boundary conditions of the sample.
Model uwzględnia własności termofizyczne i metalurgiczne przetapianej stali, parametry wiązki laserowej i warunki brzegowe procesu. W wyniku nagrzania materiału w obszarze działania wiązki lasera tworzy się jeziorko cieczy, którego kształt i rozmiar zależą od konwekcji wywołanej siłą Marangoniego. Kierunek strumienia cieczy zależy od gradientu temperatury na powierzchni, a także składu chemicznego. Utworzony model pozwala na przewidywanie kształtu strefy przetopionej w zależności od własności fizycznych materiału, parametrów wiązki i warunków brzegowych próbki.
Źródło:
Computer Science; 2008, 9; 137-146
1508-2806
2300-7036
Pojawia się w:
Computer Science
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:
Symulacja numeryczna laserowego umacniania udarowego stopu tytanu Ti-6Al-2Cr-2Mo
The numerical simulation of laser shot peening of Ti-6Al-2Cr-2Mo titanium alloy
Autorzy:
Napadłek, W.
Kosiuczenko, K.
Powiązania:
https://bibliotekanauki.pl/articles/159612.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
stop tytanu Ti-6Al-2Cr-2Mo
laserowe umacnianie udarowe
topografia powierzchni
mikrostruktura
symulacja numeryczna MES
titanium alloy
Ti-6Al-2Cr-2Mo
laser shot peening
surface topography
microstructure
numerical simulation
Opis:
W artykule przedstawiono wybrane wyniki eksperymentów laboratoryjnych wykonanych na stopie tytanu Ti-6Al-2Cr-2Mo. Opisano model fizyczny, opracowano model numeryczny, wykonano opis matematyczny zjawisk fizycznych zachodzących przy umacnianiu laserowym LSP (metoda MRS). Wykonano siatki modeli MES stanu odkształceń i naprężeń własnych dla badanego materiału w wybranych wariantach technologicznych. Przeprowadzone symulacje numeryczne potwierdziły poprawność przyjętych założeń i modeli. Stan wytężenia materiału po wielokrotnym obciążeniu udarowym (LSP) nie zmienia się proporcjonalnie do ilości impulsów laserowych - ma charakter nieliniowy.
The selected results of laboratory experiments made on the Ti-6Al-2Cr-2Mo titanium alloy were presented in the paper. It was described the physical model, was elaborated of numerical model, was made mathematical description of physical phenomena, which occur at laser shot peening (LSP). It were made networks of FEM models of strain state and internal stresses for tested material in the selected technological variants. Conducted numerical simulations were confirmed correctness of established assumption and models. The effort state of material after multiple shot peening (LPS) does not change in proportion to amount of laser impulses - it has nonlinear character.
Źródło:
Prace Instytutu Elektrotechniki; 2008, 237; 31-44
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
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
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:
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:
Numerical model of a semiconductor disk laser
Autorzy:
Sokół, A. K.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/174528.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
semiconductor disk laser
SDL
vertical-external-cavity surface-emitting laser
VECSEL
computer simulation
numerical modelling
Opis:
In this paper we describe the numerical model of a semiconductor disk laser, developed and implemented in the Photonics Group, Institute of Physics, Lodz University of Technology, Poland. It consists of four strongly interrelated components for: carrier transport, heat flow, material gain and optical phenomena calculations. Combination of these components gives the steady-state self-consistent model which enables a simulation of various aspects of a semiconductor disk laser operation. A numerical analysis of carrier and power losses within the active region of 1.3-μm GaInNAs/GaAs semiconductor disk laser has been carried out using this model.
Źródło:
Optica Applicata; 2016, 46, 2; 199-211
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of a cylindrical glass dome negative impact on a 360° field of view 2D laser scanner performance and a method for correction
Autorzy:
Wojtanowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/27311445.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
laser scanner
laser range finder
terrestrial laser scanning
skaner laserowy
dalmierz laserowy
skanowanie laserowe naziemne
Opis:
Although laser scanning ideas and hardware solutions are well-known to experts in the field, there is still a large area for optimization. Especially, if long-range and high-resolution scanning is considered, the smallest defects in optical quality should be perfected. On the other hand, the simplicity, reliability, and finally the cost of the solution plays an important role, too. In this paper, a very simple but efficient method of optical correction is presented. It is dedicated to laser scanners operating from inside cylindrical glass domes. Such covers normally introduce aberrations into both the laser beam and receiving optics. If these effects are uncorrected, the laser scanner performance is degraded both in terms of angular resolution and maximum range of operation. It may not be critical for short-range scanning applications; however, if more challenging concepts are considered, this issue becomes crucial. The proposed method does not require sophisticated optical solutions based on aspheric or freeform components, which are frequently used for similar purposes in imaging-through-dome correction but is based on a simple cylindrical refractive correction plate.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e145566
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Microscale laser shock imprinting of micro-molds with different sizes and shapes
Autorzy:
Yang, H.
Liu, K.
Liu, H.
Powiązania:
https://bibliotekanauki.pl/articles/174650.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
laser shock
imprinting
micro-mold
deformation depth
numerical simulation
Opis:
There are higher requirements for microstructures and high-precision components in microelectronics, photonics, sensors, optoelectronics and medical devices. For changing the traditional manufacturing methods with cumbersome process and complex equipment, researchers put forward a laser shock forming technique which can contribute to the metal forming with high precision and efficiency in recent years. So far, the laser shock forming needed high pulse energy and high energy. In this paper, nanosecond laser with high frequency and low pulse energy was adopted to make possible the aluminum foil forming on the copper micro-molds with different sizes and shapes. The deformations of aluminum foil were measured by SEM, optical profiler and AFM. Also, the deformation laws were analyzed by comparing imprinting results under different micro-molds. Lastly, stress distribution and deformation process of aluminum foil was investigated by numerical simulations.
Źródło:
Optica Applicata; 2018, 48, 4; 671-686
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
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
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