Autor: W.P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Dynamic model with reaction nodes of tracked agricultural tractor
Model dynamiczny z ogniwami reakcyjnymi układu napędowego ciągnika gąsienicowego
Autorzy:: Godżajew, Z. A.
Liaszenko, M. W.
Szechowcow, W. W.
Szewczuk, W. P.
Sokołow-Dobriew, N. S.
Michałowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/244389.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ciągnik gąsienicowy
układ napędowy
model matematyczny
obciążenia dynamiczne
tracked tractor
transmission system
mathematical model
dynamic loads
Opis:: In the paper there were described assumptions and methodology of building the mathematical model of the transmission system of tracked agricultural tractor. There was presented model including 34 mass elements jointed by elasto-damping elements. As a result of calculations were estimated parameters of those elements basing on measurements of real object as well as were formulated differential equations of movement taking into account the underslung working equipment. As well were described the method of modelling transmission components, especially taking into consideration reaction moments between elements transmitting power and the chassis of the tractor. There was presented the way of defining the course of engine torque and estimated the main harmonics, with ultimate influence on dynamic loads of transmission. In the range of examination of the transmission operating loads, model takes into account the inputting changes of clutch friction torque during switching it on and off. Model gives ability to analyze the dynamic loads of transmission system depending on clutch slide. Model also allows existing clearances, what gives the possibility of analysis of abrasive wear influence on functioning of the transmission. Model enables the simulation of turning mechanism brakes operation during manoeuvring movement of the tractor.
Źródło:: Journal of KONES; 2007, 14, 4; 101-112
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dynamic load in operation of high-speed tracked vehicles
Autorzy:: Borkowski, W.
Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/245770.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
combat vehicles
dynamic loads
terrain driving
HTV vibration
Opis:: The paper describes dynamic load-generating sources and their effects on high-speed tracked vehicles, placed people and equipment within it. The variety of the operation conditions causes a complex dynamic load, both in terms of level, direction and distribution. The effects of the impacts are shown in photographs. It is important to know the level of loads in terms of the development of resistant and safe high-speed tracked vehicles. The selected results of its own researches of high-speed tracked vehicles were presented. research were carried out under conditions similar to those typical for this class of vehicles, both during the rides on the road, the ground and obstacles on the specially constructed for this purpose. The results of research and analysis compare in the form of graphs and the estimated value. The presented scope and methodology allows the multi-variants investigation and estimate the loads of the hall, interior fittings and people in special vehicles and other objects that may be exposed to this type of loads. The presented results of the study confirm the possibility but also the need to load test and analysis of dynamic loads on the vehicle, its crew and equipment within it. Knowing the value of these loads allows for the rational formation of the vehicle structure for obtaining the highest possible technical and combat duration.
Źródło:: Journal of KONES; 2009, 16, 4; 17-22
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Improvised explosive devices in confrontation with the protection armour
Autorzy:: Borkowski, W.
Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/245917.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combat vehicle
improved explosive devices
modelling
Opis:: The paper describes the risk for carrying structures of special vehicles used in the stabilization and peacekeeping missions. Presented map regions of the world threatened by conflicts, which may be areas for future International peacekeeping forces. Among the hazards occurring in the missions improvised explosives devices (IED) deserve special attention. Difficult to detect and identify, acting unpredictably, high-power is destruction. Based on the available material and the results of their experimental studies are presented effects ofexplosives on special vehicles. It takes into account the cases of impact load during the flghting in the urban area, desert and mountainous. The currently used improvised explosives devices and methods of their initiation are described. Presented used in vehicles ways to protect people and internal equipment against destruction factors of explosives. The effects of the influence of loads on vehicles are shown. The results of its own, both experimental and model tests are presented. The results ofthe analysis presented in the drawings and diagrams. Carried out experimental researches have allowed to obtain Information necessary to verify: research object models in terms of assessing the level of deformation on the structure and size of dynamic load acting on crews of combat vehicles, and numerical model of the propagation of after explosion shock waves.
Źródło:: Journal of KONES; 2010, 17, 1; 67-72
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Usefulness of the adopted method for the number of aviation occurrences prediction
Autorzy:: Balicki, W.
Glowacki, P.
Powiązania:: https://bibliotekanauki.pl/articles/246325.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: air transport
air traffic safety
safety management
aviation occurrence
transport lotniczy
bezpieczeństwo ruchu lotniczego
zarządzanie bezpieczeństwem
wypadki lotnicze
Opis:: Poland – according to ICAO requirements, is obliged to conduct analyses of the coefficients adopted to assess the level of safety in civil aviation. They are carried out on the basis of the data contained in the ECCAIRS database. The authors have processed the data contained in this database by analysing them using various criteria (ICAO aviation occurrence categories, flight phases, different airports) to test the methodology of the safety indicators values forecasting and setting their “warning levels”. Exceedance of these levels could be a signal for taking preventive action by the relevant competent aviation authorities. The proposed method is based on the assumption that the determined parameters are governed by normal distribution rules (Gaussian). Parameter values calculated based on real data from 2016 were compared with those predicted a year earlier. It was found that the factors for different events have increased significantly - above the calculated warning levels, particularly for general aviation. The results of this analysis may support competent aviation authorities' decisions in areas where safety risks are most critical.
Źródło:: Journal of KONES; 2017, 24, 1; 23-29
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: How the wear of cylinder liner affects the cooperation of piston - cylinder assembly of IC engine
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/248040.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
piston ring
blow-by
torque instability
Opis:: A ring pack of modern IC engine consists of at least one compression ring that should guarantee secure a necessary tightness of combustion chamber. A circumferential wall pressure of correctly designed compression ring should be sufficient to achieve a full contact between wall and ring, which means light tightness preventing gas blowby. Lack of tightness is being considered as a principal cause of deterioration of engine performance data including torque instability, and a rapid grow in ring and cylinder wear within the area of blow-by. During engine design process mathematical models are applied which implement analytical and numerical methods of calculation. Analytical methods that were used earlier presented a limited range of application and lower accuracy in comparison to the numerical methods but they allowed achieving approximate results quicker. Taking this into consideration the presented study describes the most important relations between ring geometry and its wall pressure, which were obtained using the analytical methods. Presented formulas facilitate the evaluation of cylinder wear effect on the ring circumferential pressure distribution, especially the change in liner diameter. An attempt of light slits evaluation has been performed as well. The study was supplemented with graphs and calculative example.
Źródło:: Journal of KONES; 2012, 19, 1; 357-363
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Modelling of impact strength on combat vehicles
Autorzy:: Borkowski, W.
Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/241713.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tank
infantry fighting vehicle
carrying structure
anti-bottom mine
model testing
Opis:: In the field of threads to tracked combat vehicle on these days battle field growing importance of wide range of mines. It concern both anti- tank mines - anti-bottom, anti-track, anti-side- as well as specially prepared explosives. In the paper were presented chosen fragment of carried out experimental tests of tank exposed to impact, caused by anti-bottom mine explosion, as well as results of that effect. Methodology how to build models of tested objects was presented. Models of objects that characteristics are similar to typical combat vehicles were tested and test results were linked to publish date and authors test results, then models were loaded. As a load was applied worked out and experimentally verified model of after blast wave propagation, generated by anti-bottom mine explosion, as result of after blast wave propagated in limited space. Conclusions contain information about abilities of presented test methodology. Obtained results of model testing confirm necessity and the possibility of shaping impact strength of armoured vehicles structures. Proper selection of shapes, geometric dimensions and general parameters of structural system may be one of the means to provide proper protection.
Źródło:: Journal of KONES; 2007, 14, 1; 121-130
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: An analysis of cornering stiffness of 14.00R20 tire with run-flat insert
Analiza odporności na znoszenie boczne ogumienia 14.00r20 z wkładką typu „run flat”
Autorzy:: Luty, W.
Simiński, P.
Powiązania:: https://bibliotekanauki.pl/articles/243682.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: opona pneumatyczna
wkładka run-flat
odporność na znoszenie boczne
pneumatic tire
run-flat insert
side cornering
Opis:: Research results of 14.00R20 tire, equipped with „run-flat" insert, in aspect of cornering stiffness are presented in this paper. Resistance on side drift is one of the many attributes of automobile wheels tyres, which influences on the useful properties of vehicle. The tire cornering characteristics, determined basing on laboratory research results are shown. These characteristics were determined in wide rage of air inflation pressure and wheel normal load changes, also with no air pressure inside the tire, what corresponds with the case of projectile shooting through the tyre and simultaneously allow the „run-flat" insert to switch into the transfer the components of driving wheel load. In the vehicles appropriated to other jobs than typical transport tasks, drive wheels with the special properties are often used. They are, for example, wheels adapted to the drive with reduced values of air pressure in the tyres in the heavy terrain conditions or wheels equipped with the insert type „run-flat", adapted to the drive without air in tyre as a result of the penetration or projectile shot through the tire. Such wheels are for a long time used, for example, in the wheeled transporter carriers or in the armoured vehicles prepared to the activities in the regions of armed conflicts. Presently, the frequent cases are known of application of „run-flat" insertions also in civilian personal vehicles, as elements for increasing the vehicle security level. Basing on cornering characteristics an analysis of tire properties were carried out. Data for tire road interaction modeling, during side cornering are shown.
W pracy przedstawiono wyniki badań opony o rozmiarze 14.00R20, wyposażonej we wkładkę typu „run-flat" w aspekcie odporności na znoszenie boczne. Odporność na znoszenie boczne to jedna z wielu cech ogumienia kół jezdnych, która wpływa na właściwości użytkowe pojazdu. Przedstawiono charakterystyki odporności na znoszenie boczne, wyznaczone w szerokim zakresie zmian wartości ciśnienia powietrza i obciążenia normalnego koła. Pomiary wykonano również przy braku powietrza w kole, co odpowiada sytuacji przestrzelenia opony, a jednocześnie umożliwia udział wkładki „run-flat" w przenoszeniu składowych obciążenia koła. W pojazdach przeznaczonych do innych zadań niż typowe zadania transportowe często stosowane są koła jezdne o specjalnych właściwościach. Są to np. koła wyposażone w opony przystosowane do jazdy przy znacznie obniżonych wartościach ciśnienia powietrza w kole w ciężkich warunkach terenowych lub koła wyposażone we wkładkę typu „run-flat", przystosowane do jazdy bez powietrza w kole na skutek przebicia lub przestrzelenia powłoki opony. Takie koła stosowane są od dawna np. w kołowych transporterach lub samochodach opancerzonych przeznaczonych do działań w rejonach konfliktów zbrojnych. Obecnie znane są częste przypadki zastosowania wkładek „run-flat" również w pojazdach cywilnych, w tym osobowych, jako elementy zwiększające poziom bezpieczeństwa pojazdu. Dokonano analizy wpływu zmian warunków eksploatacji koła na właściwości ogumienia. Przedstawiono dane do modelowania współpracy koła z podłożem w warunkach toczenia ze znoszeniem bocznym.
Źródło:: Journal of KONES; 2008, 15, 3; 295-304
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Assessment of possibilities of testing the high power engine piston ring-cylinder liner collaboration on a model test stand
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/243866.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine engine
piston ring
oil film
Opis:: The design of piston rings for modern engines of low and medium power guarantees long reliable operation, thanks to proper selection of materials, suitable geometry of mating surfaces as well as the use of lubricating oils of appropriate quality. At present, the efforts of constructors focus on other aspects of operation of this kinematic pair. The aim is to reduce costs of engine run as well as improvement of ecologic indices (eg. by the reduction in lube oil consumption, reduction of friction losses through the reduction in ring number, and so on). There still occur failures caused by incorrect collaboration of piston rings and cylinder liners on engines of high output, especially the marine ones. Higher mechanical and thermal loads of crank mechanism elements as well as difficulties with supply and correct distribution of lubricating oil over the liner entire surface are among the causes of these phenomena. Because of limited measurement possibilities the research on correct collaboration of piston ring and cylinder liner could be quite difficult and expensive on a real marine engine. Such research could be carried out far easier on a model simulation test rig. The presented paper will deal with the question if the test rig purposed for the investigation of kinematic pair collaboration - property of the Combustion Engine Chair - is suitable for evaluation of collaboration of marine engine piston ring with cylinder liner in the presence of lubricating oil.
Źródło:: Journal of KONES; 2008, 15, 2; 441-448
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Passive protection of special vehicles
Ochrona pasywna pojazdów specjalnych
Autorzy:: Borkowski, W.
Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/244381.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pojazd bojowy
pojazd transportowy
ładunek wybuchowy
modelowanie
struktura ochronna
combat vehicle
transportation vehicle
explosive charge
modelling
protective structure
Opis:: W pracy przedstawiono zagrożenia dla pojazdów specjalnych i transportowych spotykane podczas wykonywania zadań w ramach misji wymuszania i utrwalania pokoju w regionach świata zagrożonych konfliktami, a mogącymi być obszarami przyszłego działa wojska. Na podstawie dostępnych materiałów i własnych wyników badań numerycznych i eksperymentalnych przedstawiono efekty oddziaływania różnych ładunków materiału wybuchowego na pojazdy specjalne. Ładunki takie mogą występować podczas walk w terenie zurbanizowanym i górzystym oraz innym o ograniczonej powierzchni. Przedstawiono kierunki prac badawczych i rozwojowych prowadzące w efekcie do podwyższenia poziomu ludzi w pojazdach specjalnych i transportowych przed środkami bojowymi, charakterystycznymi dla działań pokojowych i misji stabilizacyjnych, ale mogące występować również w działaniach bojowych. Przedstawiono wybrane rezultaty badań eksperymentalnych i modelowych oddziaływania powybuchowych fal uderzeniowych na nadwozie i opracowane struktury ochronne dla pojazdów specjalnych i transportowych. Strukturę ochronną obciążano ciśnieniem fali uderzeniowej generowanej hipotetycznym niekonwencjonalnym ładunkiem wybuchowym (improwizowanym ładunkiem wybuchowym - IED lub miną niekontaktową). W pracy podjęto również próbę wskazania możliwości oraz konieczność doboru najefektywniejszych parametrów struktury dla ochranianych części pojazdu bojowego przed potencjalnym zagrożeniem
In the paper were presented threats happen to special and transportation vehicles while task performing within the confines of peace forcing and keeping missions on world areas threatened by conflicts and that could be areas of unit future actions. Based on available materials and authors results of numerical and experimental tests, effects of various explosive charges action on special vehicles were presented. Such explosive charges could be used during fighting in urban and mountainous areas as well as other with limited area. Were presented directions of research and development leading to increase protection level for people, inside special and transportation vehicle, against combat agents characteristic for peace keeping and stabilization missions that could be used also while warfare. Were presented some results of experimental and modelling tests of after blast shock wave action on armoured shell and prepared protection structures for special and transportation vehicles. Protecting structure was loaded by shock wave pressure generated by hypothetical unconventional explosive charge (improvise explosive device - IED or non-contact mine). In the paper were also made effort to point at possibility and necessity to chose the most effective parameters of structure for protected part of combat vehicle against potential threats.
Źródło:: Journal of KONES; 2007, 14, 4; 59-66
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Prediction of the natural frequency of ship’s roll with regard to various models of roll damping
Autorzy:: Krata, P.
Wawrzyński, W.
Powiązania:: https://bibliotekanauki.pl/articles/244403.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: sea transport
ship stability
ship rolling
roll damping coefficient
Opis:: One of the most important dynamic phenomenon recognized as dangerous to seagoing ships is the resonance gain of rolling. This may occur due to nonlinearity of ship response in resonance conditions, i.e. when the encounter wave frequency is similar to the natural frequency of ship roll motion. Such coincidence should be avoided therefore shipmaster steers clear of some configurations of speed and course resulting in potential synchronous rolling. Nowadays, according to the IMO Intact Stability Code the natural period of roll is determined with the use of very simplified GM-based formula. The paper deals with the problem of more sophisticated prediction of ship’s natural rolling frequency with the use of the one degree-of-freedom roll equation with regard to nonlinear restoring moment. A special emphasis is put on the damping coefficient modelling which remains one of the crucial issues in terms of rolling simulation. Two typical approaches to the damping coefficient estimation are tested, the linear and the nonlinear one according to Ikead’s method. The set of ship roll simulations is carried out for a wide range of excitation frequency and a variety of exciting moment. The results of computation focused on the natural frequency of ship roll prediction are compared to assess the influence of damping model selection.
Źródło:: Journal of KONES; 2016, 23, 3; 289-296
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Catalytic properties analysis of platinum catalytic converters in self ignition engine exhaust gases
Analiza właściwości katalitycznych reaktorów platynowych do silników o zapłonie samoczynnym
Autorzy:: Kruczyński, S. W.
Kamela, W.
Mleczko, P.
Powiązania:: https://bibliotekanauki.pl/articles/244197.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silniki spalinowe
emisja substancji szkodliwych
reaktory katalityczne
zanieczyszczenie środowiska
combustion engines
toxic gases emission
catalytic reactors
air pollution
Opis:: In this article the catalytic properties comparison of four different platinum catalytic converters working in exhaust gases of self ignition engine were described. The test procedure and the test bench were described. Article contains structure of tested catalytic converters with physicochemical investigations of their active surface. The reactors surfaces views from scanning electron microscope (SEM) and x-ray surface structure investigations were also included. Comparison of tested catalytic converters properties were made in function of their temperature. Analyses were related to rector's ability to convert carbon monoxide, hydrocarbon, sum of nitric oxides, nitrogen monoxide and nitrogen dioxide. Results of investigations have shown that platinum catalytic converters working in diesel exhaust gases have high efficiency in oxidation of nitrogen monoxide to nitrogen dioxide. This property is mainly used in continuous regeneration trap systems (CRT). Catalytic converters ability to passive reduction of nitric oxides by use of hydrocarbons was demonstrated. Ranges of tested reactors temperature in which their properties that can be used in continuous regeneration trap systems and systems of selective nitric oxides reduction by use of hydrocarbons (HC-SCR) were defined. Mentioned reactors properties were estimated in connection to platinum load on reactors surface.
W artykule przedstawiono porównanie właściwości katalitycznych czterech reaktorów platynowych o różnym ładunku platyny pracujących w spalinach silnika o zapłonie samoczynnym. Artykuł zawiera opis stanowiska badawczego oraz procedurę badań. W pracy przedstawiona została budowa badanych modeli reaktorów katalitycznych i badania fizykochemiczne ich powierzchni aktywnych, w tym obrazy ze skaningowego mikroskopu elektronowego (SEM) oraz badania rentgenowskie struktury powierzchni. Porównania właściwości badanych reaktorów katalitycznych dokonano w funkcji temperatury ich pracy. Analiza dotyczyła zdolności reaktorów do konwersji tlenku węgla, węglowodorów, sumarycznego stężenia tlenków azotu, tlenku azotu oraz dwutlenku azotu. Wyniki badań wykazały, że reaktory platynowe pracujące w spalinach silnika o zapłonie samoczynnym wykazują dużą efektywność w utlenianiu tlenku azotu do dwutlenku azotu. Właściwość ta jest w szczególności wykorzystywana w systemach ciągłej regeneracji filtra cząstek stałych (CRT).Wykazano również zdolność tych rektorów do pasywnej redukcji tlenków azotu za pośrednictwem węglowodorów. Określono zakres temperatury pracy badanych reaktorów, przy których ujawniają się ich właściwości katalityczne możliwe do wykorzystania w systemach ciągłej regeneracji filtra cząstek stałych i systemach selektywnej redukcji tlenków azotu węglowodorami (HC-SCR). Oceniono wyżej wymienione właściwości reaktorów badawczych w zależności od ładunku platyny naniesionego na ich powierzchnię.
Źródło:: Journal of KONES; 2008, 15, 2; 247-256
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Model investigation of piston ring-cylinder liner collaboration on a high power engine
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/245364.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine combustion engine
piston ring
oil film
model test
Opis:: Failures caused by improper collaboration between piston ring and cylinder liner still happen on engines ofhigh output, marine ones in particular. Among causes of this phenomenon one can mention higher mechanical and thermal loads of crank mechanism as well as difficulties in supply and distribution of lubricating oil over the entire surface of cylinder liner. It would be extremely difficult and because of regulations in most cases impossible to perform tests on correct collaboration between rings and liner of real running engine and on the other hand such tests on a test stand would be quite expensive. Use of mathematical models and tests on simulation model stands offers a way to reduce these costs. Basic dependences connecting piston ring geometry with oil film parameters and introductory results of computations performed with the use of analytical model of test stand will be presented in this paper. The tests are to be carried out for ring geometry corresponding to that of marine engine rings. Due to that, using presented earlier formulas and computer program constructed by the authors the phenomena accompanying operation of different versions of rings were analyzed from the point of oil film thickness and generated friction losses. These ring versions which revealed the most advantageous properties will be made and tested on a test stand.
Źródło:: Journal of KONES; 2009, 16, 4; 407-413
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Test of impact resistance of tracked combat vehicle
Autorzy:: Borkowski, W.
Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/246173.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: main battle tank
combat vehicles
explosive charge
modelling
Opis:: Among combat vehicles high values have tracked combat vehicles. They are the most universal means of combat, both in offensive and in defense actions. About the usefulness of tanks decide the main battle features, which will include fire power, protection and mobility. The fire power is a feature that describes the quantity, quality and efficiency in terms of the main weapons system. Mobility of tanks reflects the dynamics of motion and manoeuvr ability. On the mobility a large impact has: engine, transmission and tracked drive system. Protections (armour, together with additional systems) decide on the resistance to the enemy fire and the survival ability of the vehicle, crew and internal equipment. This paper presents the impact loads on a load -bearing structures of combat vehicle. Load is generated by the anti-tank mine shock wave. Models ofobjects were worked out using a method of the finite element, assuming the linear characteristics of elements. Studies of loads of the structure of the special vehicle body were carried outfor the selected, the most common effects of explosives. Worked out research allows: determining the pressure distribution, evaluating the impact resistance of the hulls of vehicles, predicting the results of impact action, identifying the types of damage, designing or modernization of the hulls of vehicles.
Źródło:: Journal of KONES; 2009, 16, 1; 51-58
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Dependence of piston ring parameters determination accuracy on the method of calculation
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/247098.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
piston ring
ring geometry
ring pressure
simulation
Opis:: Mathematical models are commonly used at the stage of piston ring design and during examination of ring collaboration with liner surface. Both analytical and numerical methods are used for development of such models. In the case of models based on analytical methods the range of their application is usually limited only to selected cases while the use of numerical methods allow to widen the range of their applications but their accuracy depends on increment used. The paper presents a procedure of verification of the piston ring mathematical model constructed by the authors using numerical methods. Conformity between the results obtained using this program and the results of analytical calculations concerning the displacement of ring free ends brought about by the acting loads was the aim of the analysis. Exemplary computations were carried out for three compression rings of different geometry. Regarding the conformity of achieved results as satisfactory for practical use probable causes of observed discrepancies were pointed out. Relations between energy accumulated in curved bar and loading force (according to the Castiliano's theorem) were used in a course of calculations. Exemplary calculations were carried out for compression rings of three types engine, i.e. automotive, bulldozer and marine ones. A probable cause of differences between results of calculations carried out according to various analytical methods have been pointed out assuming their accuracy as satisfactory for practical purposes.
Źródło:: Journal of KONES; 2011, 18, 4; 435-441
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Compression rings of low-speed high power engines
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/247699.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine combustion engine
piston ring
compression ring
oil film
Opis:: The paper describes the design of compression rings used in low-speed, high power marine engines and it analyses relations between the most important operational parameters. Ring material, dimensions, geometry of sliding surfaces, distribution of circumferential pressure as well as operational conditions (thermal and mechanical loads, way of lubrication) were taken into consideration for the analysis mentioned above. Moreover, the paper points at modifications in ring geometry that have been happening for last years, comparing previous and recent designs. The effect of ring circumferential pressure against liner on the piston-cylinder assembly operation has been considered and the causes of its variability have been pointed out as well. When presenting the methods of measurement and tangential force calculations basic advantages and disadvantages have been presented as well as the evaluation of changes resulting from the ring circumferential wear. The compression ring mathematical model developed by the authors allows for a precise definition of relations between ring geometry and distribution of ring circumferential pressure. A need for a more accurate method of ring circumferential pressure evaluation has been justified in summary, giving hints necessaryfor its preparation.
Źródło:: Journal of KONES; 2010, 17, 4; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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