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Wyświetlanie 1-15 z 19
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
The cascade exchange pressure supercharger of transport diesel with deep cooling cycle air
Autorzy:
Krajniuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/374248.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
cykl pracy
doładowanie
głębokie chłodzenie
wydajność
charakterystyka obciążenia
working cycle
supercharging
deep cooling
performance
load characteristic
Opis:
The new principle of the organisation of working process of the combined supercharging system of transport diesel with the Cascade Pressure Exchanger (CPE) has been described. It allows considerably to raise level of forcing of the engine by supercharging at the expense of expansion of effective air supply area and coolings of supercharging air to temperature below an ambient. Substantive postulates of imitating model of work of combined engine(CICE) have been stated. Some results of calculation-experimental investigations of supercharging system of the engine 6×Í12/14 have been given. It confirms the possibility of the essential improvement tractive and fuel-economic factors of the transport installations in broad range of the working conditions.
Źródło:
Transport Problems; 2011, 6, 3; 67-76
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new devices of gas-turbine engines of ground transport on the basis cascade pressure exchanger of krajniuk
Autorzy:
Krajniuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/374815.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
kaskadowa wymiana ciśnienia
gazo-turbinowe silniki
cykl pracy
energooszczędność
wydajność
cascade pressure exchange
gas turbine engines
working cycle
power efficiency
performance
self-cooling
Opis:
Main trends of perfection of gas-turbine engines (GTE) of transport plants by application of principles of the cascade pressure exchange (CPE) for air compression in the working cycle of gas-turbine plant have been analyzed. The principle of action and performances of work of heat compressor CPE realizing compression of working body on the whole at the expense straight convert inputting heat in disposing work of torrent with insignificant distraction mechanics work from shaft selection of power has been described. The results of computational investigation of four variants of the GTE working process organization on the basis of the two-staged compression assembly with intermediate cooling and heating of air-gas medium have been adduced. Application of units CPE in the capacity of compressing stage GTE opens the prospect of adaptations GTE performance by conditions of work in the capacity of forcing units of overland transport.
Źródło:
Transport Problems; 2011, 6, 2; 107-119
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal compressor of cascade exchange by pressure
Termiczny kompresor do kaskadowej wymiany ciśnienia
Autorzy:
Krajniuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/374103.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
kaskadowa wymiana ciśnienia
kompresor termiczny
cykl pracy
temperatura
energooszczędność
wydajność
charakterystyka obciążenia
cascade pressure exchange
thermal compressor
working cycle
temperature
power efficiency
performance
load characteristic
Opis:
A new method of organization of working cycle of device of direct transformation of heat in the located work of compression of air, based on principle of cascade exchange by pressure, is exposed; the results of pre-selection of basic dimensional and structural parameters of thermal compressor of cascade exchange by pressure are adduced; some special features of its working process are considered; main directions of perfection of working cycle of thermal compressors of cascade exchange of pressure are shown.
Źródło:
Transport Problems; 2010, 5, 1; 15-22
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena sprawności cyklu roboczego pojazdu do usuwania odpadów z pojemników na podstawie danych eksploatacyjnych
Working cycle efficiency evaluation of Refuse Collection Vehicle based on exploitation data
Autorzy:
Wysocki, O.
Zajdziński, T.
Czyżewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/309906.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
śmieciarka
zużycie energii
zużycie paliwa
efektywność cyklu roboczego
pojazd do usuwania odpadów z pojemników
energy consumption
fuel consumption
working cycle efficiency
waste collection vehicle
refuse collection vehicle
Opis:
W artykule przedstawiona została metoda oceny sprawności cyklu roboczego śmieciarki. Wykorzystując dane eksploatacyjne wyznaczono dwa reprezentatywne cykle i na ich podstawie obliczono zarówno sprawność całego cyklu, jak i jego poszczególnych faz. Porównano wartości energii potrzebnej do opróżniania pojemników, energii do zagęszczania odpadów oraz energii z paliwa. Przedstawiono przebiegi mierzonych i obliczonych wartości w czasie obrazując w ten sposób rzeczywiste przebieg parametrów układu hydraulicznego i obciążenia silnika spalinowego poczas rzeczywistej pracy pojazdu.
In this paper a method of efficiency evaluation of working cycle of Refuse Collection Vehicle is presented. Using real world data, two representative working cycles were analyzed. Total cycle efficiency was calculated, as well as the efficiency of particular cycle phases. Then, energy needed to collect, energy needed to compact the waste and energy from fuel were compared. Measured and calculated values vs time were shown on the diagrams illustrating hydraulic system parameters and the real load applied to the chassis combustion engine.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 9; 188-192
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a possible application of a small power plant in the Organic Rankine Cycle, which apply waste heat from a combustion engine
Autorzy:
Żabski, J.
Gumkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1191839.pdf
Data publikacji:
2018
Wydawca:
Gdańska Szkoła Wyższa
Tematy:
Organic Rankine Cycle
working fluids
waste heat
Opis:
Some considerations on the waste heat treatment, heat and power combined generation and principles of the Organic Rankine Cycle and its application are produced. A thermodynamic screening of eight working fluids for Organic Rankine Cycle (ORC) was carried out. All investigated agents were single component fluids. The considered ORC systems operated at the upper temperature in the range Tmax=146-185°C and the lower one Tmin=27-37°C. The highest pressure in the cycles equalled pmax=3500 kPa and pmin=85 kPa. The cycles were run at subcritical pressures and the saturated vapour line was of the overhanging type in all cases. Heat regeneration was not considered in this paper. The heat source for the ORC system was heated air exhausted from the cooling system of an opposed-piston engine. The temperature of this heat at the inlet to ORC was equal to Th,in=230°C. Air was also the heat sink for the ORC with the inlet temperature Tcold,in=20°C. The power output of the ORC, neglecting electric generator efficiency, was kept in the range N=10-11 kW. Calculated thermal efficiencies h held values between 0.121 and 0.164.
Źródło:
Eco-Energetics: technologies, environment, law and economy; 2018, 1; 127--135
2657-5922
2657-7674
Pojawia się w:
Eco-Energetics: technologies, environment, law and economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corporate liquidity in normal and crisis times: what is the best yardstick?
Autorzy:
Dorsman, André Bastiaan
Westerman, Wim
Powiązania:
https://bibliotekanauki.pl/articles/14110942.pdf
Data publikacji:
2021-12-28
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
cash
working capital
cash conversion cycle
crisis
liquidity measures
Opis:
Abstract: Aim: This paper is meant to investigate measures that help to assess corporate liquidity in both normal and crisis periods. Design / research methods: We provide an overview of relevant liquidity measures used by both professionals and academics, apply regular liquidity measures on three major European electricity suppliers, study three local cases to find out how a recent crisis affected liquidity and provide an overview of liquidity management on 27 electricity, oil/gas and other multinational firms. Conclusions / findings: Liquidity measures concentrate on cash ratios, working capital ratios and in specific the cash conversion cycle (CCC). It appears to matter whether a company is production driven or sales driven. In crisis times, whereas priorities do change, liquidity measures should not. Originality / value of the article: We plead for keeping a close eye on the CCC in both good and bad times. The article provides various recommendations to academics and practitioners.
Źródło:
Central European Review of Economics and Management; 2021, 5, 4; 9-32
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Working Capital Management in Manufacturing Enterprises
Autorzy:
Gołaś, Zbigniew
Czerwińska - Kayzer, Dorota
Bieniasz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/599696.pdf
Data publikacji:
2011
Wydawca:
Wyższa Szkoła Informatyki i Zarządzania z siedzibą w Rzeszowie
Tematy:
working capital
cash conversion cycle
inventory conversion period
receivables conversion period
payables conversion period
Opis:
The paper presents different lengths of working capital cycle and cash conversion cycle in manufacturing companies in Poland in two sub-periods: 2001-2004 and 2005-2008. The conducted research shows that the working capital cycle is varied, related to the sector. In most sections it has a positive value and is longer than 18 days in the first analyzed period, while in the period of 2005-2008 it is longer than 35 days. This means that companies have enough working capital for an increasingly long period of time. The cash conversion cycle in the analyzed period also varied in particular years and sections. In most sectors it was longer than 30 days, which means that enterprises require additional financing in a period of more than one month. On the basis of conducted research we can conclude that the policy of working capital and cash management was appropriate, adjusted to the current economic situation of the country.
Źródło:
Finansowy Kwartalnik Internetowy e-Finanse; 2011, 7, 4; 1-12
1734-039X
Pojawia się w:
Finansowy Kwartalnik Internetowy e-Finanse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Working Fluid Selection for Simple and Recuperative Organic Rankine Cycle Operating Under Varying Conditions: A Comparative Analysis
Autorzy:
Igbong, Dodeye
Nyong, Oku E.
Enyia, James
Agba, Ambrose
Powiązania:
https://bibliotekanauki.pl/articles/2023504.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
organic rankine cycle
organic working fluid
supercritical
exergy
organiczny cykl Rankine'a
organiczne ciecze robocze
nadkrytyczny
egzergia
Opis:
The selection of suitable working fluid for simple and recuperative organic Rankine cycle (ORC) operating under subcritical, superheated and supercritical conditions are investigated. 11 fluids with critical temperature above 1500C are considered as potential candidates. Performance screening parameters such as net power output, thermal efficiency, turbine sizing parameter (SP) and volumetric flow ratio (VFR), exegetic parameters like irreversibility rate, fuel depletion ratio, and improvement potential rate of exergy destruction were also evaluated. Results indicate that R600a, R236fa and R1233dz(E) demonstrated the best performance for subcritical, superheated and supercritical simple ORC, respectively. R236fa and R1233dz(E) proved more suitable for subcritical/superheated and supercritical recuperative cycles, respectively. The system exegetic efficiency is reveal to be significantly higher in subcritical/superheated (61-65%) cycles compared to the supercritical (35-45%) cycle, the evaporator seen as the main source of exergy destruction, accounting for 17-37% of inlet exergy destroyed and about 8-24% in the turbine.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 202-221
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the temperature difference between the heat source and the evaporation temperature in ORC systems working with natural refrigerants
Autorzy:
Rusowicz, Artur
Grzebielec, Andrzej
Łapka, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2073389.pdf
Data publikacji:
2022
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
Organic Rankine Cycle
ORC
refrigerant
waste heat
working fluid
organiczny cykl Rankine'a
chłodziwo
strata ciepła
płyn roboczy
Opis:
The use of waste heat in many branches of industry is limited due to temperature in the range of 30 to 100°C. One of the methods of using waste heat are devices that implement the Organic Rankine Cycle (ORC). In currently used ORC systems, the heat source temperature is at least 80oC, while the low temperature heat source (usually atmospheric air) has a temperature of 30oC. The work analyzes the influence of the organic fluids properties on the performance of the proposed installation driven by the waste heat and working based on the ORC. The basic operation parameters in nominal conditions were determined for three selected natural refrigerants R290, R600a, R717 and one synthetic R245fa. The condensing temperature 30oC were defined as a nominal value. The research results compare how the generated electric power will change depending on the temperature difference between the temperature of the heat source and the temperature of evaporation. It turns out that for a device with finite dimensions, the maximum power is obtained for a specific evaporation temperature. And this is not the highest temperature that can be achieved. The highest evaporation temperature allows for the highest efficiency of the system, but not the maximum of capacity.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2022, 1; 46--57
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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