Wszystkie pola: working cycle - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of thermodynamical parameters of combustion engine working cycle
Autorzy:: Siemińska - Jankowska, B.
Ambrozik, A.
Jankowski, A.
Ślęzak, M.
Powiązania:: https://bibliotekanauki.pl/articles/246372.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
engine thermodynamics
engine working cycle
Opis:: Thermodynamics systems may be classified as isolated, closed, or open based on the possible transfer of mass and energy across the system boundaries. An isolated system is one that is not influenced in any way by the surroundings. This means that no energy in the form of heat or work may cross the boundary of the system. In addition, no mass may cross the boundary of the system. A thermodynamic system is defined as a quantity of matter of fixed mass and identity upon which attention is focused for study. A closed system has no transfer of mass with its surroundings, but may have a transfer of energy (either heat or work) with its surroundings. An open system is one that may have a transfer of both mass and energy with its surroundings. Described system being an object of the paper is an open system for some phenomena. An object the paper is the thermodynamical analysis of the filling process of the cylinder which occurs in calculated period from the percussion cap of the position the piston at TDC to it position at BDC, at constant average value of the pressure in the cylinder. During durations of the filling process of the cylinder, dirt of the working charge combustion products are not taken into account. One accepts that the quantity of the working charge in the established point placed on the compression line by piston BDC is equal quantity of the working charge in the end point of the filling process, answering to the start point of the real compression process. The state of the working charge in cylinder described is four parameters: a pressure, a temperature, quantity moles of the working charge and its volume. For appointment those parameters, earlier worked out dependences are put-upon.
Źródło:: Journal of KONES; 2007, 14, 3; 563-572
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Theoretical and real working cycle of four stroke piston engine
Autorzy:: Ambrozik, A.
Jankowski, A.
Slezak, M.
Powiązania:: https://bibliotekanauki.pl/articles/243165.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
thermodynamics
working cycle
cylinder pressure
Opis:: The most important problems concerning analyses of generalized computational thermodynamical working cycle of the four-stroke combustion engine are result of the identification of real indicating diagram. The analysis of working cycle of the four-stroke combustion engine is realized from point of view heat efficiency, the average theoretical cycle pressure, as well as of the influence of the organization working cycle on the value of the maximum pressure in the cylinder of a combustion engine. A novel mathematical model reflecting elementary processes occurring in the cylinder of a combustion engine and connected with it intake and exhaust systems of engine were proposed. Thermodynamical working cycles of four-stroke piston engines, theoretical working cycle of a four-stroke piston engine, thermal efficiency of the theoretical thermodynamic generalised engine work cycle, mean theoretical pressure of the generalised thermodynamic work cycle of a combustion engine, maximum pressure of the theoretical thermodynamic work cycle of a combustion engine, comparative working cycles of piston engines, real working cycle of four-stroke piston engines are presented In het paper. The methods of analyses and calculations referring these engines work cycles were presented. These method show advisability and needs of using them to theoretical calculations and analyses of real work cycles. Generalized engine work cycle was proposed.
Źródło:: Journal of KONES; 2007, 14, 2; 9-18
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optimization of the working cycle of harbour cranes
Optymalizacja cyklu roboczego dźwigów portowych
Autorzy:: Vukovic, J.
Bugaric, U.
Glisic, D.
Petrovic, D.
Powiązania:: https://bibliotekanauki.pl/articles/280763.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: optimization
working cycle
harbour crane
Opis:: The paper presents one of the possible ways optimization of motion of the harbour crane grab minimization of the working (unloading) cycle, energy consumption and material dissipation during the grab discharging. The optimization procedure of the working cycle is divided into two phases. Firstly, it is optimization of the cargo and grab motion and, secondly, determination of motion of the crane mechanisms upon the obtained optimal parameters of cargo and grab trajectory. The developed mathematical model enables direct application of the optimal contral theory methods, i.e. a method of optimization of cargo and grab motion by making use of Pontryagins maximum principle. All relevant expressions are derived analytically.
W pracy przedstawiono jeden z możliwych sposobów optymalizacji ruchu chwytaka dźwigu portowego oraz minimalizacji cyklu roboczego pod kątem ograniczania zużycia energii oraz strat materiału podczas rozładunku. Procedurę optymalizacji cyklu roboczego podzielono na dwie fazy. W pierwszej zoptymalizowano ruch przenoszonego obiektu i chwytaka, podczas gdy w drugiej wyznaczono ruch pozostałych elementów dźwigu dla znalezionej optymalnej trajektorii obiektu i chwytaka. Sformułowany model matematyczny układu umożliwił na bezpośrednie zastosowanie metod teorii optymalnego sterowania, w tym optymalizacji z zasady maksimum Pontriagina. Wszystkie związane wyrażenia wyprowadzono analitycznie.
Źródło:: Journal of Theoretical and Applied Mechanics; 2007, 45, 1; 147-159
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Marine diesels working cycle monitoring on the base of IMES GmbH pressure sensors data
Autorzy:: Neumann, Stefan
Varbanets, Roman
Kyrylash, Olena
Maulevych, Vladyslav
Yeryganov, Oleksiy
Powiązania:: https://bibliotekanauki.pl/articles/327592.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: diesel engine
cylinder pressure monitoring
top dead center
gas pressure sensor
Butterworth low-pass filter
mean indicated pressure
indicator valve channel
silnik spalinowy
czujnik ciśnienia
monitorowanie
wydajność
Opis:: The paper presents algorithms for marine diesel engines’ working process monitoring designed by analyzing data obtained with IMES pressure sensors. Main features and properties of IMES sensors, used for 2- and 4-stroke modern marine diesel engines, are presented here. The pressure-time diagrams were taken as a basis for creating algorithms for marine diesel engines’ working process monitoring. The task of preliminary calculation of top dead center position (TDC) of a cylinder was solved using polytropic compression equation. TDC position was calculated using the equation P' = 0. Then algorithm for calculating the average indicator pressure and the indicator power of the cylinder has been determined. The CFD methods show how indicator valve channel influences the results of marine diesel engines’ working process monitoring. With the example of compression curves in a cylinder, it’s shown amplitude and phase distortions introduced into pressure measurements by the indicator valve channel. Such research work is important and actual in time due to the use of marine diesel portable performance analysis systems.
Źródło:: Diagnostyka; 2019, 20, 2; 21-26
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The identification of model parameters for a semi-empirical model of working process in the compression-ignition engine
Autorzy:: Brzozowski, K.
Nowakowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/243901.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modelling
working cycle
artificial intelligence
Opis:: The paper concerns the identification process applied for a semi-empirical model of working process in the CI engine. The identification is based on pressure courses in the cylinder recorded during the experimental measurements on the test stand and is performed for estimation of values of the model parameters. Appropriate estimated values of the model parameters ensure minimization of the difference between measured and modelled pressure courses in the cylinder. The identification process can be divided into two stages. The first stage concerns identification of discrete values of the model parameters for a set of discrete engine operating conditions. The task of discrete identification is formulated as a dynamic optimisation task which is sohed using a genetic algorithm. The accuracy of the identification process is evaluated by comparison of measured and calculated values of main parameters which characterize the working cycle such as: the mean indicated pressure, thermal efficiency, the mean indicated pressure in working part of the cycle, maximal pressure of the cycle, the mass of the medium in the cylinder and the crankshaft angle for which the maximal pressure occurred. The second stage concerns generalization of the results for any technically possible engine operating conditions which is sohed by means of approximation. Feed-forward multilayer artificial neural networks are usedfor the approximation. The accuracy of the identification and some examples of verification of the model predictions are presented as well.
Źródło:: Journal of KONES; 2010, 17, 3; 41-48
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Computer simulation of the working cycle of a quantum controlled-NOT gate with two coupled quantum dots
Autorzy:: Moskal, S.
Bednarek, S.
Adamowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1964205.pdf
Data publikacji:: 2004
Wydawca:: Politechnika Gdańska
Tematy:: semiconductor quantum dot
quantum date operation
controlled-NOT (CNOT) gate
Opis:: We discuss a possible realization of a quantum controlled-NOT gate with the use of two coupled quantum dots. Transitions between quantum states of a computational basis are driven by the microwave π-pulse. The parameters of the proposed nanodevice have been optimized in order to make the operation cycle of the gate as short as possible. Numerical solutions of the time-dependent Schrodinger equation allow us to simulate transitions between the quantum states which correspond to the subsequent stages of the gate's operation. The performed time-dependent simulations are a test of realizability of the quantum controlled-NOT gate in the nanodevice.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 591-602
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Evaluation of usefulness of mass flow meter to the survey of SI engine cylinder filling in one working cycle
Autorzy:: Wołczyński, Z.
Powiązania:: https://bibliotekanauki.pl/articles/133140.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: SI engine
fill survey
mass flow meter
phase of fill survey
silnik ZI
miernik przepływu masy
Opis:: The article presents the technique of the usage of mass flow meter to the fill survey of a cylinder in the multi cylinder engine, in each working cycles. The result of correctness of the survey was grounded on the comparison of air masses: the one registered with the usage of the flow meter and the other one calculated on the basis of mixture parameters. The flow meter was located in the consolidated part of suction system in front of the throttle valve. Mixture parameters were determined on the basis of time of fuel injection and measured lzm factor of burnt mixture. The studies were carried out in the whole operating range of engine. Discrepancies between the measured and calculated values for 93% of all of the cycles fall within the ambit of ±3% of the actual value.
Źródło:: Combustion Engines; 2017, 56, 2; 187-192
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Dobór cech materiałowych pasów zębatych w aspekcie cyklu działania pasa
Selection of material features of aspect of belt working cycle
Autorzy:: Domek, G.
Powiązania:: https://bibliotekanauki.pl/articles/2071340.pdf
Data publikacji:: 2010
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: timing belts
timing pulleys
synchronous drives
pasy zębate
koła pasowe
przekładnie synchroniczne
Opis:: Projektując pas zębaty należy zwrócić uwagę na dobór materiałów, które mają decydujący wpływ na właściwości mechaniczne pasa. W zależności od sposobu jego wykorzystania, napęd, transport czy też sterowanie, w różny sposób można poddawać go procesom recyrkulacji. Może to dotyczyć połączeń pasów, pokryć strony grzbietowej lub całości materiału pasa. Nowoczesne pasy zębate powinny być elementem wytrzymałym, efektywnym,
Selection of materials has a significant influence on mechanical properties of timing belts and therefore much attention should be paid during their designing. Depending on application: transmission, conveying or controlling, belts can be subject to recycling. Recycling may concern belts joining, belts covering or the whole belt itself. Modern timing belts should not only be durable or effective but also safe for users and yheir environment.
Źródło:: Inżynieria i Aparatura Chemiczna; 2010, 5; 37-38
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Novel method appointing of the effective heat release coefficient during combustion process based on real indicator diagram
Autorzy:: Jankowski, A.
Ambrozik, A.
Jankowska-Sieminska, B.
Ślęzak, M.
Powiązania:: https://bibliotekanauki.pl/articles/244287.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
working cycle
thermodynamics
indicator diagram
heat release
Opis:: An object of the paper is a novel method of effective heat release coefficient appointing during combustion process of the based on the real indicator diagram. The process quality of the heat release during process of combustion is evaluated by value of the effective heat release coefficient. Accepted assumptions at appointing effective coefficient of heat release refer to acceptable that thermodynamical parameters of the working charge according to points of the real indicator diagram and the computational diagram are such the same, the maximum pressure of real working cycle of the engine is equal to the pressure of the computational cycle, work of the working charge performed in period from point of closing of the inlet valve to point of the beginning of the exhaust process are for both considered working cycles equal, heat values of the carried to the real and computational cycle are such the same. The method of appointing of the self-ignition delay period is presented in the paper, using to this end intersection point of two graphs of temperature course of the working charge prepared for the first phase of combustion process. Other methods appointing characteristics is suggested in paper basing on the real indicator diagram. The graphic illustration of the preparing method of characteristics of the relative quantity of the heat release during combustion process is illustrated in paper.
Źródło:: Journal of KONES; 2007, 14, 4; 133-142
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The post-warranty random maintenance policies for the product with random working cycles
Autorzy:: Shang, Lijun
Wang, Haibin
Wu, Cang
Cai, Zhiqiang
Powiązania:: https://bibliotekanauki.pl/articles/2038106.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: random working cycle
warranty
post-warranty reliability
replacement last
replacement first
Opis:: Advanced sensors and measuring technologies make it possible to monitor the product working cycle. This means the manufacturer’s warranty to ensure reliability performance can be designed by monitoring the product working cycle and the consumer’s post-warranty maintenance to sustain the post-warranty reliability can be modeled by tracking the product working cycle. However, the related works appear seldom in existing literature. In this article, we incorporate random working cycle into warranty and propose a novel warranty ensuring reliability performance of the product with random working cycles. By extending the proposed warranty to the post-warranty maintenance, besides we investigate the postwarranty random maintenance policies sustaining the post-warranty reliability, i.e., replacement last (first) with preventive maintenance (PM). The cost rate is constructed for each post-warranty random maintenance policy. Finally, sensitivity of proposed warranty and investigated polices is analyzed. We discover that replacement last (first) with PM is superior to replacement last (first).
Źródło:: Eksploatacja i Niezawodność; 2021, 23, 4; 726-735
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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