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1
Content available Fatigue testing devices in a complex load condition
Dudek A., Papacz W.
Archives of Materials Science and Engineering
|
2019
|
Vol. 95, nr 1
20--30
EN
Purpose: The article presents an overview of fatigue testing devices for polymer composites in a complex load condition. This paper presents physically existing devices and which are in the design phase. Also presented are own concepts of the construction of such devices. The analysis of each device was completed with a description of its advantages and disadvantages. There are various constructor approaches to the problem of fatigue testing. The choice of the device depends on the research program adopted for implementation. Design/methodology/approach: The article presents the comparative analysis of individual devices. The authors presented their own proprietary designs of machines for fatigue tests in a complex load condition. Findings: It was found that the selection of the machine should provide restoration of real working reconstruction of the tested object. Originality/value: Specialist research machines are very expensive. Knowledge about technical solutions and potential capabilities of fatigue testing machines, and about the availability of such devices, allows for the best adjustment of the research program and the optimization of their costs. For designers of new machines, the submitted compendium of solutions may provide inspiration for improvements in the own constructions of subsequent generations of such devices.
2
Content available remote Analiza możliwości wykorzystania odpadowych tworzyw tucznych w procesie produkcji płyt drogowych
Papacz W., Stec M., Wandzel J.
Wiadomości Naftowe i Gazownicze
|
2018
|
R.21, Nr 12 (242)
13--16
3
Wzmocnione tworzywa sztuczne w motoryzacji
Bielefeldt K., Walkowiak J., Papacz W.
Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska
|
2014
|
z. 1/97
71--80
PL
W artykule przedstawiono możliwości stosowania materiałów polimerowych w motoryzacji. Omówiono niektóre wymagania stawiane materiałom oraz wskazano możliwości znacznego zwiększenia wytrzymałości materiału wskutek zastosowania wzmocnienia. Przedstawiono liczne przykłady zastosowań tworzyw wzmocnionych na części motoryzacyjne. Opisano także niektóre najnowsze technologie umożliwiające produkcję części samochodowych z tworzyw wzmocnionych, w tym także konstrukcji hybrydowych.
EN
The paper presents the possibility of using polymeric materials in the automotive industry. Some of the requirements for materials have been discussed and the possibilities of a significant increase in strength of the materials by the use of reinforcements have been indicated. Numerous examples of applications of reinforced plastics as automotive parts have been presented. Some of the latest technologies that enable the production of automotive parts from reinforced plastics, including hybrid structures, have been described.
4
Content available remote A method for calculation of curved beams
Papacz W.
International Journal of Applied Mechanics and Engineering
|
2012
|
Vol. 17, no. 1
271-278
EN
In this paper, results of theoretical considerations of calculations of crooked beams are presented. Analytic relations between displacements of the beam axis, deformations of the beam, area of transversal section and Young's modulus and external loads are used for calculation of beams of any curvature. The equations derived herein can be used for calculation of large displacements of beams of any curvature, also for composite leaf springs.
5
Content available Biomethane as an environment- friendly fuel for municipal transport
Papacz W.
Archives of Transport
|
2012
|
Vol. 24, iss. 3
367-376
EN
An idea to replace the conventional engine fuel with biomethane has been described. The effects of such a swap have been analysed for municipal transport buses in Warsaw. The replacement has been shown to result in a significant reduction of toxic exhaust emissions and in economic savings. The analysis results have been presented in the form of tables and graphs.
PL
W artykule przedstawiono ideę zamiany konwencjonalnego paliwa silnikowego na biometan. Przeprowadzono analizy efektów takiej zamiany dla autobusów komunikacji Miejskiej w Warszawie. Wykazano, że zamiana doprowadzi do znacznego ograniczenia emisji toksycznych składników spalin oraz do oszczędności ekonomicznych. Wyniki zestawiono w tabelach oraz przedstawiono za pomocą wykresów.
6
About possibilities of applying biomethane as car's fuel
Papacz W.
Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska
|
2011
|
z. 5/86
131-140
EN
There is growing interest in the use of biogas as a fuel for transport applications. The aim of this paper is to present the potential role of biogas as a transport fuel. To be used as a transport fuel biogas has to be upgraded to at least 95% methane by volume and it can then be used in vehicles originally modified to operate on natural gas. Biogas fuelled vehicles can considerably reduce of CO2 emissions compared with fossil fuels. The paper sets out the resource that is available for producing biogas, together with the basic details of production technology. It goes on to explore how this gas can be used in vehicles, describing the basic technology requirements. The energy data and the costs of producing on biogas as a transport fuel are presented.
PL
W pracy przedstawiono analizę możliwości stosowania biometanu jako paliwa silnikowego. Pokazano metody jego oczyszczania oraz korzyści stosowania jako paliwa silnikowego w zakresie redukowania emisji CO2 w porównaniu z paliwami kopalnianymi. W artykule przedstawiono produkty wsadowe, z których możliwa jest produkcja biogazu, podstawowe informacje dotyczące technologii produkcji i oczyszczania biogazu. Ponadto przedstawiono dane dotyczące kosztów produkcji i potencjału energetycznego biogazu.
7
Content available Biogas as vehicle fuel
Papacz W.
Journal of KONES
|
2011
|
Vol. 18, No. 1
403-410
EN
There is growing interest in the use of biogas as a fuel for transport applications. Some of the drivers behind this are the increasing regulation and taxes on waste disposal, an increasing need for renewable fuel sources, the EC’s Biofuels Directive, the proposed Renewable Transport Fuel Obligation (RTFO), measures to improve local air quality and the need for clean transport fuels in urban areas. The aim of this paper is to present the potential role of biogas as a transport fuel. Biogas is produced from the process of anaerobic digestion of wet organic waste, such as cattle and pig slurries, food wastes and grown wet biomass. To be used as a transport fuel biogas has to be upgraded to at least 95% methane by volume and it can then be used in vehicles originally modified to operate on natural gas. Biogas fuelled vehicles can reduce CO2 emissions by between 75% and 200% compared with fossil fuels. The higher figure is for liquid manure as a feedstock and shows a negative carbon dioxide contribution which arises because liquid manure left untreated generates methane emissions, which are 21 times more powerful as a greenhouse gas than CO2. Hence there is a double benefit by reducing fossil emissions from burning diesel and reducing methane emissions from waste manure; Biogas will give lower exhaust emissions than fossil fuels, and so help to improve local air quality. The paper sets out the resource that is available for producing biogas, together with the basic details of production technology. It goes on to explore how this gas can be used in vehicles, describing the basic technology requirements. The energy data and the costs of producing on biogas as a transport fuel are presented.
8
Content available Environmentally friendly car reinforced plastics in automotive engineering structural design considerations. Part II
Bielefeldt K., Papacz W., Walkowiak J.
Archiwum Motoryzacji
|
2011
|
Nr 4
5-17
EN
A review of applications of reinforced polymers and polymer composites to the construction of automotive vehicles has been presented. Particular attention has been paid to the heavily loaded parts and subassemblies. Various components of vehicle body and power transmission and suspension systems, as well as subassemblies situated in the engine compartment have been analysed. In each case, the structure of the part involved, the material type used, and the loads to be borne have been described. The parts to be analysed have been deliberately selected to show the technological progress that takes place in the application of reinforced plastics to the construction of load-bearing structures of modern vehicles. The paper has been provided with conclusions concerning the development trends and directions of further research in the field of the use of reinforced polymers for the construction of vital vehicle parts and subassemblies.
PL
W artykule przedstawiono przegląd zastosowań polimerów wzmocnionych i kompozytów polimerowych w budowie pojazdów samochodowych. Szczególną uwagę zwrócono na części i podzespoły przenoszące duże obciążenia. Analizie poddano elementy nadwozia pojazdu, układu napędowego, zawieszenia oraz podzespoły komory silnika. Każdorazowo opisywano budowę podzespołu, rodzaj użytego do jego budowy materiału oraz obciążenia jakim jest poddawany. Części do analizy dobierano tak, aby pokazać postęp technologiczny jaki następuje w stosowaniu tworzyw wzmocnionych do budowy struktur nośnych współczesnych pojazdów. Artykuł zakończono wnioskami dotyczącymi tendencji rozwojowych oraz kierunków dalszych badań w obszarze stosowania polimerów wzmocnionych na odpowiedzialne podzespoły i części pojazdów.
9
Content available Environmentally friendly car plastics in automotive engineering. Part I
Bielefeldt K., Papacz W., Walkowiak J.
Archiwum Motoryzacji
|
2011
|
Nr 2
5-19
EN
The possibilities to use polymer plastics in automotive engineering from the point of view of the manufacturing of an environmentally-friendly car have been presented in this paper. The general requirements to be met by such materials have been discussed and the possibilities of significant improvement of, inter alia, mechanical strength properties of polymer plastics by the use of appropriate additives, inclusive of carriers, have been indicated. The most frequently used plastics and numerous toughening materials have been mentioned. Many examples of the application of plastics toughened with the most recent materials, e.g. nanomaterials or, in consideration of the ecological aspect, natural fibres have been presented. The essence of the most modern technologies making it possible to manufacture vehicle components from plastics toughened with various carriers has also been described, which also covers the issue of hybrid structures.
PL
W artykule przedstawiono możliwości stosowania tworzyw polimerowych w motoryzacji w aspekcie produkcji samochodu ekologicznego. Omówiono ogólne wymagania stawiane materiałom oraz wskazano możliwości znacznego zwiększenia między innymi właściwości wytrzymałościowych tworzyw polimerowych poprzez stosowanie odpowiednich dodatków, a w tym nośników. Wymieniono najczęściej stosowane tworzywa oraz liczne materiały wzmacniające. Przedstawiono liczne przykłady zastosowań tworzyw wzmocnionych najnowszymi materiałami, np. nanomateriały, jak i z uwagi na ekologiczny aspekt - włóknami naturalnymi. Opisano także istotę najnowszych technologii umożliwiających wytworzenie części samochodowych z tworzyw wzmocnionych różnymi nośnikami, w tym także w odniesieniu do konstrukcji hybrydowych.
10
Własności dynamiczne resorów kompozytowych
Papacz W.
Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska
|
2009
|
z. 2/74
73-80
PL
W pracy przedstawiono wyniki badań tłumienia drgań resorów stalowych i kompozytowych. Resory kompozytowe wykonano z kompozytu epoksydowo - szklanego. Zostały one zaprojektowane tak, aby w pełni zastąpić resory stalowe montowane w tylnym zawieszeniu samochodu dostawczego. Podczas badań obciążano dynamicznie resory oraz rejestrowano amplitudę i reakcje podpór podczas drgań resoru. Zmierzone i zarejestrowane parametry pozwoliły na obliczenie współczynnika tłumienia drgań dla resorów stalowych i kompozytowych. Współczynniki tłumienia drgań resorów kompozytowych okazały się trzykrotnie większe od współczynników resorów stalowych. Resory kompozytowe ponadto były ok. pięć razy lżejsze od stalowych oraz dawały mniejsze obciążenia dynamiczne nadwozia pojazdu.
EN
In this paper research results of ability vibration's suppression steel and composite leaf springs were presented. Polymeric composite leaf springs and steel were studied. Composite leaf springs were made from epoxy-glass composite reinforced by glass fiber. Composite springs became designed to be able to replace steel spring of van. Executed investigations based on dynamic loadings of leaf springs and registering of vibrations amplitude and reaction of props. Measured and registered parameters permitted to count coefficient of suppression of tremblings. These coefficients were counted for composite and steel leaf springs. Composite leaf springs in comparison to steel have about three times better suppress of tremblings. They are about five times lighter and give smaller dynamic burdens of vehicle's body.
11
Content available Basic dynamic parameters of composite leaf springs
Papacz W.
Journal of KONES
|
2009
|
Vol. 16, No. 1
379-385
EN
In this paper research results of ability vibration's suppression steel and composite leaf springs were presented. Polymeric composite leaf springs and steel were studied. Composite leaf springs were made from epoxy-glass composite reinforcement by glass fibre. Composite springs became designed to can replace steel spring of van. Executed investigations base on dynamic loadings of leaf springs and registering of vibrations amplitude and reaction of props. Load was realized through lowering from definite height of mass which hit into spring wresting it from balance. Mass stayed on spring to total atrophy of vibrations. Measured and registered parameters permitted to count logarithmic decrement suppressions of tremblings and coefficient of suppression of tremblings. This coefficient was counted for composite and steel leaf springs. Basic exploational parameters of leaf springs were compared as well as basic advantages of applying to vehicles building of composite materials were analysed. Analyses lead to conclusion that composite leaf springs in comparison to steel springs: about three times better suppress of tremblings, they are about five times lighter and give smaller dynamic burdens of vehicles body. Wide applying of composites materials on carrying structures of vehicles will contribute to lower of vehicles mass and to decrease of emission greenhouses gases.
12
Content available remote Some parameters of composite leaf springs
Papacz W.
International Journal of Applied Mechanics and Engineering
|
2009
|
Vol. 14, no 4
1181-1187
EN
In this paper, results of research on vibration suppression in steel and composite leaf springs are presented. Polymeric composite leaf springs and steel springs are studied. Composite leaf springs were made of an epoxy-glass composite reinforced with glass fibre. Composite springs were designed in such a way that they could replace steel springs in a van. Static and dynamic examinations of both the springs were performed. The amplitude of vibrations and the reaction of props were measured and recorded. These parameters rendered it possible to calculate the logarithmic decrement of vibration suppression and the coefficient of vibration suppression for steel and composite leaf springs. The results are presented in tables and graphs. It is concluded that composite leaf springs in comparison to steel springs about three times better suppress vibrations , they are about five times lighter and generate smaller dynamic burdens to vehicle bodies.
13
Content available Dynamic parameters of composite leaf springs
Papacz W.
Archiwum Motoryzacji
|
2009
|
Nr 3
235-243
EN
In this paper, results of research on vibration suppression in steel and composite leaf springs are presented. Polymeric composite leaf springs and steel springs are studied. Composite leaf springs were made of an epoxy-glass composite reinforced with glass fibre. Composite springs were designed in such a way that they could replace steel springs in a van. Static and dynamic examinations of both the springs were performed. The amplitude of vibrations and the reaction of props were measured and recorded. These parameters rendered it possible to calculate the logarithmic decrement of vibration suppression and the coefficient of vibration suppression for steel and composite leaf springs. The results are presented in tables and graphs. It is concluded that composite leaf springs in comparison to steel springs about three times better suppress vibrations, they are about five times lighter and generate smaller dynamic burdens to vehicle bodies. Wide applying of composites materials on structures of the vehicles will contribute to lower a vehicles mass and to decrease an emission of greenhouse gases.
PL
W artykule przedstawiono wyniki badań podstawowych parametrów dynamicznych resorów kompozytowych. Przeprowadzono badania statyczne i dynamiczne. Badania prowadzono na resorze kompozytowym który jest współzamienny z resorem stalowym stosowanym w zawieszeniu samochodu dostawczego Lublin. Obliczono współczynniki tłumienia drgań resorów stalowych i kompozytowych. Wyniki zestawiono w tabelach oraz przedstawiono za pomocą wykresów.
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