Wszystkie pola: barnat - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical simulation of dynamic weld compression
Autorzy:: Barnat, W.
Kordys, M.
Moćko, W.
Dybcio, P.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/247316.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: Split-Hopkinson Pressure Bar
SHPB
welding
weld
Opis:: The article presents some numerical results and experimental validation of Split Hopkinson pressure bar (SHPB) tests for welded S40NL steel. The goal of this research is to define material constants for modelling it in FEM. Steel was tested with Charpy impact test to determine properties of material. Next, the joint for welding was prepared. It was welded with electric arc welding method (MAG) with flux-cored wire. Hopkinson bar test is well-known experiment method used to determine material properties at high strain rates. The tests were performed in Institute of Fundamental Technological Research. Material properties for Johnson-Cook material model were obtained. Comparison between experimental results taken in quasi-static conditions and dynamic conditions proves that the behaviour of materials in those two states is quite different. Results from one type of loading condition cannot be used to create a realistic model of material when it is loaded dynamically. Numerical simulation of Hopkinson bars was performed on cylindrical model with known length and accelerated to high speed in direction of incident bar. For the purpose of the simulation, a Finite Element Code LS-DYNA was used. It allows simulation of dynamic response of SHPB system. The results show quite good agreement. The model can be used to simulate weld performance under high strain rate.
Źródło:: Journal of KONES; 2012, 19, 2; 35-43
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental and numerical buoyancy analysis of tracked military vehicle
Autorzy:: Kotowski, M.
Barnat, W.
Grygorowicz, M.
Panowicz, R.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/242914.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: buoyancy
military vehicle
amphibious vehicle
CFD
Opis:: The paper presents experimental validation of numerical flow analysis around tracked amphibious military vehicle. The aim of the study was to validate the simulation results and visualize the flow around optimized geometry To perform numerical simulations, a Computational Fluid Dynamics code FLUENT was used. The software is dedicated to model flow, turbulence, heat transfer, and reactions. The area was divided into two domains – air and water. During the simulation, water was moving with speed specified in standardization. However the numerical techniques are constantly developed and improved there is still a strong need for verification especially in buoyancy analysis and water performance evaluation. Results showed quite good agreement with literature after some modifications of the model. Then the flow was numerically visualized. That allowed in-depth analysis of the flow around each of vehicle's parts and some major and minor modifications were proposed. Modified geometry was analyzed and obtained results will be compared with previous ones. Additional stability and manoeuvrability tests were conducted. The results will be used to modify the geometry of vehicle and conduct experimental tests to verify the numerical code performance and check the actual change in vehicle's water performance. Future work will also consider propeller influence on results.
Źródło:: Journal of KONES; 2012, 19, 4; 321-324
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Experimental investigation of ied interrogation arm during normal operation
Autorzy:: Barnat, W.
Gotowicki, P.
Kiczko, A.
Dybcio, P.
Szczepaniak, M.
Jasiński, W.
Powiązania:: https://bibliotekanauki.pl/articles/243002.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
improvised explosive device
interrogation arm
Opis:: The paper presents experimental static tests of IED interrogation arm for Shiba special vehicle. The test was performed by Military University of Technology and Military Institute of Engineer Technology. A number of strain gauges and camera markers were placed on the arm to allow recording strains and movements of specific construction points. The arm's motion was recorded using high speed camera. The equipment used were Vishay EA 06 120LZ 120 strain gauges with ESAM Traveller bridge. The sampling rate was 1000 Hz. The test was to pick up maximum design weight, move it to maximum overhang and then drop it on the ground. During the test, signal from gauges and video capture was recorded. The data was then processed using Thema 3D software to obtain markers displacements and angular changes of both arm parts. Afterwards, the test was repeated for different weight. The analysis showed, that maximum stresses in examined construction parts did not exceed yield stress of material. As well as that, in-depth motion analysis of the arm was conducted. Further works are twofold. Firstly, there will be tests concerning arm under dynamic load occurring during normal maintenance During this test only strains in specific construction parts will be recorded. Secondly, numerical model of an arm will be developed and validated using data obtained during both tests. This will help visualize stress distribution in each arm's part.
Źródło:: Journal of KONES; 2012, 19, 4; 571-575
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Ballistic performance of FRP – steel layered structures
Autorzy:: Barnat, W.
Gotowicki, P.
Dybcio, P.
Gieleta, R.
Kosiuczenko, K.
Powiązania:: https://bibliotekanauki.pl/articles/245321.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ballistic performance
NATO 5.56
ballistic test
experimental technique
Dyneema
Opis:: In this study, the impact performance of layered structures made of aramid/epoxy, S2 glass/epoxy, Dyneema and steel subjected to high velocity impact is presented. All materials were previously examined using proper techniques of strength tests. The procedure allowed determining Young’s moduli, Poisson’s ratio, ultimate compression and tension strength, shear modulus. The ballistic test procedure was based on standards for testing panels and armour plates. For the purpose of ballistic tests, standard 5.56 NATO ammunition (183 g) was used. The aim of presented work was to determine ballistic performance of different structures under bullet impact. During the tests, subsequent time moments were recorded using Phantom V12 high-speed camera. When structure penetration did occur, the residual velocity of bullet was measured using PVM-21 lightscreen. Basing on the results, each material performance was evaluated. This paper reviewed a number of mechanisms that influence the ballistic performance of ballistic textiles. The composites reinforced with continuous fibres (aramid, S2 glass) could effectively absorb the kinematic energy of bullet. The efficiency of energy absorption for each types of material in the order from highest is as follows: polyethylene fibres Dyneema HB50, composite reinforced with S2 glass fibres, composite reinforced with aramid fibres.
Źródło:: Journal of KONES; 2013, 20, 2; 15-20
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical analysis of initial and boundary conditions influence on the crew of tracked vehicle and the ground
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/243703.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: hull design
tracked vehicle
Opis:: The problem of vehicle's impact resistance is broadly discussed in many articles and standardizations concerning special structures. In this paper, the numerical analysis results of an armoured vehicle loaded with blast wave are presented. Effects of ground proximity such as wave reflection are also taken into account. What is more, the tracking system was also included in calculations. The ground was modelled using Mie-Grüneisen equation of state. In the research an ALE coupling algorithm was used to model interaction between fluid (Euler domain) and structure (Lagrange domain). Euler description is used for air and blast wave propagation modelling, whereas structure is described by Lagrange equations of mass, momentum and energy conservation. The ALE coupling algorithm is implemented in MSC Dytran software. The problem was solved using explicit integration of movement equations over time. The research showed that ground and wheels considerably affect the simulation results. The pressure impulse on the vehicle's bottom increased by 40 per cent compared to the model in which these effects were not considered. Furthermore, the quality of the results increased as the solution obtained is more physical. Proposed method is a useful tool in hull design process. As well as that, the method will be further developed to include more detailed model of the vehicle.
Źródło:: Journal of KONES; 2011, 18, 1; 31-38
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Dynamic response of mine flail structure subjected to blast loading
Autorzy:: Barnat, W.
Gotowicki, P.
Kiczko, A.
Dybcio, P.
Szczepaniak, M.
Jasiński, W.
Krysiak, P.
Powiązania:: https://bibliotekanauki.pl/articles/247427.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: improvised explosive device (IED)
mine flail
demining machine
Shiba
Opis:: The paper presents experimental test of mine flail structure designed for a prototype of the Shiba special military vehicle. The Shiba vehicle is equipped with such structure to neutralize mine and IED threats which are one of the most harmful weapons used during modern warfare and peacekeeping missions. The experimental test was performed by the Military Institute of Engineer Technology and the Military University of Technology. The test procedure was based on NATO standards. Detonation of 8 kg TNT AT mine under wheel of the prototype was taken into consideration as a case of possible load during mine clearance operation on the battlefield. The test procedure included deformation measurements of selected parts of mine flail structure. During the tests, strain gauges and camera markers were placed on the structure to allow recording of strains and observation of the specific construction point’s movements. The motion was recorded using three high-speed Phantom cameras. Vishay EA-06-120LZ-120 strain gauges with ESAM Traveler bridge with sampling rate 100 kHz were used for strain measurements. The test was performed on military proving ground. As a result, strain versus time plots were obtained. The results were processed using ESAM software. Strain gauges were placed paired in specific structure points. High-speed camera recordings were obtained to visualize the process of structure response. The sequences of selected frames are shown. Pictures of deformed structure are presented.
Źródło:: Journal of KONES; 2013, 20, 3; 21-27
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical Analysis of IED Detonation Effect on Steel Plate
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/387041.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: fala uderzeniowa
improwizowane ładunki wybuchowe
MES (metoda elementów skończonych)
blast wave
IED
improvised explosive device
FEM
finite element method
Opis:: The article presents the results of initial works on protection of vehicles crews against improvised explosive mechanisms (charges) IED. The presented coupled problem of explosion and interaction of pressure impulse coming from detonation was described in available standard documents. The presented results are the introduction to works oncomposed protective layers applied in vehicles.
Źródło:: Acta Mechanica et Automatica; 2012, 6, 1; 10-12
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numeryczno-doświadczalna analiza oddziaływania ładunku wybuchowego na przeciwminowy trał naciskowy
Numerical and Experimental Analysis of Impact of Explosive Charge on a Mine Roller
Autorzy:: Krysiak, P.
Jasiński, W.
Szczepaniak, M.
Wojciechowski, A.
Barnat, W.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/403576.pdf
Data publikacji:: 2015
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: mechanika
modelowanie
ładunek wybuchowy
trał przeciwminowy
mechanics
modelling
mine roller
explosive charge
Opis:: W pracy przedstawiono projekt mechanicznego kołowego urządzenia trałującego. Po wybraniu odpowiedniej koncepcji wykonano model geometryczny urządzenia. Następnie model dyskretny trału poddano analizie wytrzymałościowej. W kolejnej fazie wykonano prototyp jednego segmentu konstrukcji oraz przeprowadzono na nim badania wytrzymałościowe na poligonie doświadczalnym. Kołowy pojazd wyposażony w omawiane urządzenie będzie służył do trałowania naciskowego dróg, w których mogą być ukryte ładunki wybuchowe, szczególnie ładunki typu IED (Improvised Explosive Device). Trał docelowo będzie współpracował z pojazdem o podwyższonej ochronie załogi.
The paper presents the whole process of designing a mechanical mine roller starting from the concept in the initial phase to the geometric model of the device. Later stage involved the pre-defined geometry undergoing resistance analysis. The later stage included manufacture of one segment of the mine roller and its tests under field conditions. The vehicle onto which the roller will be mounted is intended as a tool to keep the roads traversable and clear of IEDs (Improvised Explosive Devices) in particular. The mine roller will be mounted onto a mine-clearing vehicle with increased armoured protection.
Źródło:: Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2015, 6, 4 (22); 95-105
2081-5891
Pojawia się w:: Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:: Biblioteka Nauki

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