Wyniki wyszukiwania - Biblioteka Nauki

1

Analiza przydatności do picia wód źródeł Zimnika i Czyrnej w Beskidzie Śląskim

100%

Malek S. , Krakowian K.

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nr 38

2

The effect of environmental conditions on surface water quality in the Zimnik and Czyrna catchments of the Beskid Śląski

100%

Malek S. , Krakowian K.

Journal of Water and Land Development

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2009

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nr 13a

3

Kilka zgrabnych taktyk do programu Mapnik

100%

Krakowian K.

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2008

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nr 04

20-21

4

Dopplerowska wibrometria laserowa w diagnostyce silnika spalinowego

80%

Kaźmierczak A. , Krakowian K. , Wróbel R.

Przegląd Elektrotechniczny

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2010

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tom R. 86, nr 10

147-149

PL

Artykuł prezentuje możliwości zastosowania systemów diagnostycznych, opartych na dopplerowskim laserze wibrometrycznym i cyfrowym przetwarzaniu sygnału prędkości drgań silnika spalinowego o zapłonie samoczynnym. Badano jednostkę napędową – silnik Volkswagen 1,9 tdi, montowany w szeregu popularnych na polskich drogach pojazdów samochodowych. Przedstawiona w artykule analiza wyników pomiaru opiera się na porównaniu prędkości względnej drgań silnika sprawnego z tym samym obiektem po uszkodzeniu układu zasilania. Prędkość względną drgań, będącą funkcją dyskretną, poddano operacjom cyfrowego przetwarzania, takimi jak okienkowanie i filtrowanie cyfrowe.

EN

The article presents possibilities of use popular diagnostics systems based on Doppler Laser Vibrometry and digital signal processing on discrete absolute velocity vibration signal of diesel combustion engine. Measure of the absolute velocity of engine’s vibration was carried out by Polytec PSV – 400 vibrometer. The Volkswagen 1,9 tdi diesel engine was researched. It is a very popular unit which is installed in a series of popular European vehicles. The construction of this engine is very interesting because the fuel supply system is based on injections pumps. Analysis of measured absolute vibration signal of engine which is presented in article based on a comparison between vibrations of properly working engine to this same object with fuel supply failure. Received diagnostic’s information in a voltage answer form which is proportionate to an amplitude of absolute velocity is a discrete function treated of digital signal processing with non parametrical windowing, fast Fourier transform, filtering with finite impulse response filters (which were windowing in time domain for achieved a better characteristic) generated with expanded Remez algorithm.

5

Ocena jakosci wod zrodlanych w rejonie Skrzycznego i Baraniej Gory

80%

Malek S. , Astel A. , Krakowian K. , Opalacz J.

Sylwan

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2010

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tom 154

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nr 07

499-505

6

An approach to improve passive safety by means of "active bumper" which compensates the łuck of cars compatibility as well as different aggressivity when frontal impact of a large truck and a motor car is under consideration

80%

Kaźmierczak A. , Górniak A. , Kawaliło P. , Krakowian K.

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tom Vol. 17, No. 3

181-188

EN

The seriousness of an impact "large truck - motor vehicle" has been exhibited. The procedures of truck and motor car s crash testing were compared in order to point out the necessity of car s crashworthiness investigation in terms of compatibility and impacts between vehicles with large difference in mass and rigidity. Furthermore the paper explains a course of frontal impact between large truck and motor car in order to proof the necessity of cars compatibility as well as aggressivity investigation. The mass effect along with rigidity effect was exhibited as well. Moreover, the paper explains the design as well as objectives of the passive safety devices of both motor car and large truck. The concept of another, innovative passive safety device such as "active bumper" has been emphasized. Its working principia, adaptive control as well as the diagrammatically presented design were pointed out. The bumpers control is very difficult as it will be entirely independent from a driver and it has to operate in random condition, therefore, the paper contains a proposition of controlling algorithm of the "active bumper". It also contains explanation of adaptation of the "active bumper" with various working condition as well as consideration of the "active bumper" application with various types of large trucks design.

7

Dynamika pojazdu oraz koncepcja adaptacyjnego zawieszenia nowej generacji

80%

Kaźmierczak A. , Kawaliło P. , Krakowian K. , Górniak A.

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2010

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tom Nr 2

78--82

PL

Niniejszy artykuł opisuje koncepcję zawieszenia pojazdu nowej generacji, którego działanie polega na automatycznej zmianie kąta pochylenia koła w czasie jazdy. Ma to na celu poprawę przyczepności między oponą a jezdnią, niezależnie od warunków jezdnych. Ponadto przedstawiony jest wpływ geometrii zawieszenia oraz pochylenia koła na zachowanie się pojazdu w czasie jazdy oraz analiza zawieszenia za pomocą programów komputerowych.

EN

This article describes the concept of a new generation of vehicle suspension, which works by automatically changing the camber angle while driving. The aim is to improve the grip between tire and road a part of driving conditions. In addition, influence of suspension geometry on behavior of the vehicle and analysis of the suspension using computer programs.

8

Roślinność wybranych źródlisk w masywie Skrzycznego (Beskid Śląski)

80%

Bodziarczyk J. , Malek S. , Voncina G. , Krakowian K.

Chrońmy Przyrodę Ojczystą

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2016

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tom 72

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nr 1

9

Review of possibilities of increasing the thickness of an anti-wear coating on piston rings by using specifically designed physical vapour deposition process

61%

Skorupa P. , Kaźmierczak A. , Błasiński T. , Borkowska J. , Krakowian K. , Łoza Ł.

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tom Vol. 22, No. 4

281--286

EN

The super-hard, anti-wear amorphic coatings based on carbon-like diamond (called DLC) show a promising direction in automotive industry, mainly in terms of decreasing friction coefficient in parts of internal combustion engine. However, the technology of producing DLC-coated parts, which is most often chemical vapour deposition (CVD) or physical vapour deposition (PVD) is proven to be still not perfect for achieving desired characteristics of the coating. The thickness of a coating is the main issue one should strive to improve, as the PVD methods produce films as thin as few micrometres. In such case, the coating is not only exposed to cracking, but also pitting is possible to happen. This is proven to be highly undesirable and unacceptable for this process. In addition, in case of thin films, the adhesion to the base is often too weak, despite the coating itself being extremely durable and hard. In this article, a theoretical ways to improve the process of coating are presented. The process itself is described, the achievable parameters are defined and the possible improvements are stated. The research made for the purpose of this article will be further exploited to design a process allowing creating the coating for testing of the best possible characteristics.

10

Various designs of the two-stroke engine heads with the valve flushed system

61%

Łoza Ł. , Kaźmierczak A. , Borkowska J. , Skorupa P. , Krakowian K. , Cienciała M.

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tom Vol. 22, No. 4

187--190

EN

The two-stroke engines have never acquired the popularity of the four-stroke engines due to their inherent performance limitations. The tasks of many engineering teams were to find the basic causes, which resulted in the inferior performance of these engines. Today’s task is to build a two-stroke engine whose performance could match that of a four-stroke engine in areas of common use. The most typical performance problems of a two-stroke engine are high petrol consumption caused by low efficiency, toxic by-products of combustion being emitted into the atmosphere (caused by oil present in the petrol), and uneven and loud engine noise. The greatest challenge is to achieve a good chamber purge during one stroke in which the fresh fuel mixture flows through the piston-controlled inlet port while at the same time the fumes are being exhausted through the outlet port. This in contrast with the four-stroke engines where the intake and exhaust are each done with two separate strokes. From the energy point of view, the two-stroke engine is not efficient because a certain amount of fresh fuel is being wasted in the exhaust fumes. We propose to replace the piston-controlled cam with the valve-flushed system, which will cause the combustion process to become more efficient. The purpose of this paper is to present various designs of the engine heads and analyse their performance. The goal of this proposal is to choose the best combination of these engine heads in order to achieve the optimum overall engine performance.

11

The impact of the energy state of the surface of friction pairs on the friction and wear in internal combustion engines

61%

Borkowska J. , Kaźmierczak A. , Krakowian K. , Cienciała M. , Skorupa P. , Łoza Ł.

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tom Vol. 22, No. 4

37--41

EN

The elements creating a friction pairs are described to be very difficult in terms of defining all optimal parameters in an unequivocal way. The research on stability of friction pairs is focused on the surface and the top layer of surface in the parts concerned. The main goal is to find new design solutions and materials, thereby achieving one million kilometers of mileage to main repair in the case of internal combustion engines. The biggest structural difficulties are noticeable in friction pairs where it can be observed sliding and returning motion, which is also connected with sealing function. A typical example of such pair is piston ring – cylinder sleeve in piston – rings - cylinder unit in an internal combustion engine. Engineers are currently seeking an additional factor, which would enable gaining the reduction of tangential force by reducing the friction coefficient in elements of friction pair during operations. The surface free energy may be such factor - it results from molecular structure and nature of the bonds between the molecules present in the material. Components of surface free energy determine the tribological properties of the material, which is reflected in the stability of the units. Energy state of the surface, which is connected with chemistry and characteristics in the material, is the first step to consider about the impact on wearing in internal combustion engine. This is the main topic of this article.