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    Wyświetlanie 1-15 z 15
    Tytuł:
    Modelling concept of NxM matrix converter under periodic control for dynamic states
    Autorzy:
    Sieńko, T.
    Sobczyk, T. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141505.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Matrix converter
    control strategy
    symmetrical components
    equivalent Scheme
    Opis:
    This paper presents a concept of an NxM Matrix Converter (MC) modeling under periodic control strategy patented in Poland. This strategy allows to change an Nphase input system of voltages and current with the frequency fi to the M-phase output system with the frequency fo, maintaining both systems symmetrical and providing small distortions of voltage and current waveforms at rather high frequencies. In this paper the control strategy is extended for dynamic states when one of the frequencies is changed. Matrix converter equations have been derived using the constrain matrix, which is determined by the switch states. The equations have the hybrid form of a multi-port circuit. To simplify these equations the symmetrical components of input and output voltages and currents have been applied. As a result, rather simple equations have been found. They can be interpreted to an equivalent scheme. All considerations are illustrated using an exemplary 6H3 matrix converter.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 2; 305-315
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of control strategies against Cydia pomonella (L.) in Morocco
    Autorzy:
    Iraqui, S.
    Hmimina, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/66433.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    assessment
    control strategy
    Cydia pomonella
    insect resistance
    insecticide control
    sexual trap
    Morocco
    Opis:
    The codling moth, Cydia pomonella (L.), is the key pest of apple production worldwide. In Morocco, there is a sustainable presence of codling moth causing considerable damage in apple orchards despite frequent applications of broad spectrum insecticides. For 12 years, sexual trapping and chemical control were performed and the development of the codling moth population was analysed in an orchard which was in the region of Azrou. The efficacy of some insecticides (azinphos-methyl, chlorpyriphos-ethyl, diflubenzuron, thiacloprid, methoxyfenozide, spinosad, and deltamethrin) was also evaluated on neonate larvae and compared with a laboratory sensitive strain. This procedure was done to assess an eventual resistance in Moroccan populations. The action threshold was usually exceeded, leading to an intensive chemical control, with an average frequency of 9 to 13 days. The chemical control was done according to the action persistence time of the insecticides and the trap captures. However, those two parameters are compromised in Moroccan conditions because of the high summer temperatures which disrupt the action of insecticides and exacerbate populations. The pheromone traps may become ineffective and useless. Neonate larvae were resistant to five insecticides out of seven. Such results suggest the presence of a cross resistance in local strains. Overall, the insect resistance, the functioning of the sexual traps, and some insecticides properties (persistence action, pre-harvest interval) are the key factors that could explain the failure to control these moths under Moroccan conditions.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of chemical weed control strategies in biomass sorghum
    Autorzy:
    Pannacci, E.
    Bartolini, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/64978.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomass crop
    sorghum
    Sorghum bicolor
    herbicide
    weed management
    chemical control
    weed control
    control strategy
    Opis:
    Two field experimental trials were carried out in central Italy, in 2005 and 2006, on biomass sorghum [Sorghum bicolor (L.) Moench] in order to assess weed control efficacy and selectivity to the crop of some pre- and post-emergence herbicides applied at different doses and in different mixtures. All herbicides showed good selectivity to the crop, although postemergence treatments showed higher transitory phytotoxicity effects than pre-emergence treatments, especially when high temperatures occurred after treatments, decreasing the selectivity of leaf herbicides (i.e. MCPA, 2,4-D, bromoxynil and dicamba). Considering pre-emergence applications, terbuthylazine alone against broadleaves or in mixtures at low doses with s-metolachlor against mixed infestations (grasses + broadleaves), seemed to be the best options to obtain a good selectivity to the sorghum and a high weed control level. Aclonifen showed some limits in terms of weed spectrum and could be recommended only against simplified broadleaf weed infestations without the presence of less susceptible weeds, like Amaranthus retroflexus, Portulaca oleracea and Solanum nigrum. Propachlor seemed not to be advisable due to the low efficacy against all the major broadleaf warmseason weed species in the Mediterranean areas. Considering post-emergence applications, all treatments gave quite similar results in terms of weed control, although, the mixture of terbuthylazine + bromoxynil seemed to be the best option due to bromoxinil’s higher efficacy than other foliar herbicides, such as MCPA, 2,4-D and dicamba, which can increase the efficacy of terbuthylazine alone especially under dry weather conditions. There were no significant differences in sorghum biomass between herbicide treatments, although, the more selective pre-emergence treatments showed, on average, a higher biomass yield value than the less selective post-emergence treatments. For these reasons, biomass values seemed to be more related to herbicide selectivity than to herbicide efficacy, especially in cases of scarce competitiveness of weed flora.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation and experimental results of hybrid electric machine with a novel flux control strategy
    Autorzy:
    Paplicki, P.
    Wardach, M.
    Bonisławski, M.
    Pałka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140694.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PM machines
    FEM analysis
    experimental results
    control strategy
    field control capability
    efficiency maps
    Opis:
    The paper presents selected simulation and experimental results of a hybrid ECPMS-machine (Electric Controlled Permanent Magnet Synchronous Machine). This permanent magnets (PMs) excited machine offers an extended magnetic field control capability which makes it suitable for battery electric vehicle (BEV) drives. Rotor, stator and the additional direct current control coil of the machine are analyzed in detail. The control system and strategy, the diagram of power supply system and an equivalent circuit model of the ECPMS-machine are presented. Influence of the additional excitation on the performance parameters of the machine, such as: torque, efficiency, speed limits and back-EMF have also been discussed.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 1; 37-51
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Triple-layer based control strategy for molten carbonate fuel cell - hybrid system
    Autorzy:
    Milewski, J.
    Miller, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/185632.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strategia kontroli
    control strategy
    solid oxide fuel cell
    off-design operation
    Opis:
    Based on mathematical modelling and numerical simulations, a control strategy for a Molten Carbonate Fuel Cell Hybrid System (MCFC-HS) is presented. Adequate maps of performances with three independent parameters are shown. The independent parameters are as follows: stack current, fuel mass flow and compressor outlet pressure. Those parameters can be controlled by external load, fuel valve and turbine-compressor shaft speed, respectively. The control system is purposed to meet many constraints: e.g. stack temperature, steam-to-carbon ratio, compressor surge limitation, etc. The aim is to achieve maximum efficiency of power generated within these constraints. Governing equations of MCFC-HS modelling are given. An operational line of the MCFC-GT system is presented which fulfils several constraints (temperature difference, cell temperature, etc.) The system is able to achieve efficiency of more than 62% even in part-load operation.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 3; 445-461
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elaboration of a strategy to control the peach twig borer Anarsia lineatella Zeller in the Sefrou region in Morocco
    Autorzy:
    Asfers, A.
    Blenzar, A.
    Rachdaoui, M.
    Joutei, A.B.
    Houssa, A.A.
    Sekkat, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/66784.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control strategy
    peach twig borer
    Anarsia lineatella
    tolerance threshold
    Sefrou region
    Morocco
    Opis:
    Trapping by specific sex pheromones initiated in 2009 to monitor three pests, peach twig borer (Anarsia lineatella), oriental fruit moth (Cydia molesta) and plum fruit moth (Grapholita funebrana) revealed the greater importance of peach twig borer in comparison to the others. The results of monitoring the development of larval stages over time and the accumulated degree-days from biofix show that the pest develops five generations per year, one of which undergoes a diapause. In 2009 and 2010 chemical control based on tolerance threshold of 10 males/trap/2 weeks showed unsatisfactory results. With this method, the percentage of affected fruits increased from 6.8% in 2009 to 18.6% in 2010 despite the application of four treatments of organophosphate-based insecticides in 2009 and the application of four treatments in 2010 using active ingredients from different chemical families (pyrethroid, organophosphate and chlorinicotinyl). On the other hand, management of the peach twig borer by the degree-days method tested and planned on the basis of a bifenthrin treatment between 150 to 204 degree-days accumulated from biofix, gave interesting results where the percentage of affected fruits hardly exceeded 0.5% over the four years of study
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the operation of a switched reluctance motor in the extended constant power range
    Autorzy:
    Korkosz, Mariusz
    Podskarbi, Grzegorz
    Krzywdzińska-Kornak, Krystyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2202546.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    continuous conduction
    control strategy
    extended constant power range
    SRM
    switched reluctance motor
    Opis:
    In this paper, an analysis of the properties of a switched reluctance motor (SRM) 8/6 in an extended constant power range is presented. The typical constant power range to constant torque range ratio is between 2 and 3. In the case of machines designed as an electric vehicle drive, it is important to maximize this ratio. In the case of an SRM, it is possible to achieve this by applying an appropriate control strategy. An analysis of the SRM operation utilizing a modified control algorithm allows control of the maximum value of the motor phase current. As a consequence, using the so-called nonzero initial conditions for the current and flux allows the output power to be maintained in a wide speed range. For the improvement of drive system efficiency, the work of the phase current regulator should be limited to a minimum. The most advantageous work conditions we obtain with single-time current regulator work. Laboratory verification has been performed for selected states of motor work.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 43--58
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis, simulation and experimental strategies of 5-phase permanent magnet motor control
    Autorzy:
    Mekri, Fatima
    Elghali, Seifeddine Ben
    Charpentier, Jean-Frédéric
    Powiązania:
    https://bibliotekanauki.pl/articles/140704.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control strategy
    constant torque
    current references
    minimum copper losses
    modeling
    multi-phase machine
    Opis:
    This paper presents a study of control strategies for 5-phase permanent magnet synchronous motors (PMSMs) supplied by a five-leg voltage source inverter. Based on the vectorial decomposition of the multi-phase machine, fictitious machines, magnetically decoupled, allow a more adequate control. In this paper, our study focuses on the vector control of a multi-phase machine using a linear proportional-integral-derivative (PID) current regulator in the cases of sinusoidal and trapezoidal back-electromotive force (EMF) waveforms. In order to determine currents’ references, two strategies are adopted. First one aims to minimize copper losses under constant torque, while the second one targets to increase torque for a given copper losses. These techniques are tested under a variable speed control strategy based on a proportional-integral (PI) regulator and experimentally validated.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 629-641
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On fault tolerant control structures incorporating fault estimation
    Autorzy:
    Krokavec, D.
    Filasová, A.
    Liščinský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229298.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    linear systems
    fault tolerant control
    fault estimation
    linear matrix inequalities
    H∞ norm
    H2/H∞ control strategy
    Opis:
    The paper provides the minimal necessary modifications of linear matrix inequality conditions for the mixed H2/H∞ control design as well as for the augmented observer-based fault estimation to be mutually compatible in joint design of integrated fault estimation and fault tolerant control. To be possible, within this integration, to design the controller which guarantees a pre-specified H∞ norm disturbance attenuation level, the design conditions has to be regularized using the H2 performance index and, moreover, augmented fault observer must be of enforced dynamics. Analyzing the ambit of performances given on the mixed H2/H∞ design, the joint design conditions are formulated as a minimization problem subject to convex constraints expressed by a system of LMIs. The feasibility of the conditions is demonstrated by a numerical example.
    Źródło:
    Archives of Control Sciences; 2016, 26, 4; 453-469
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of organic waste material overgrown with Trichoderma atroviride as a control strategy for Sclerotinia sclerotiorum and Chalara thielavioides in soil
    Autorzy:
    Kowalska, B.
    Smolinska, U.
    Szczech, M.
    Winciorek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/66092.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    organic material
    waste material
    application
    Trichoderma atroviride
    biological control
    control strategy
    Sclerotinia sclerotiorum
    fruit pomace
    Chalara thielavioides
    soil
    Opis:
    The effect of granulated organic waste material overgrown with Trichoderma atroviride TRS25 on the survival of Sclerotinia sclerotiorum and Chalara thielavioides in the soil was investigated. Application of this material into the soil at a dosage of 1% (w/v) reduced the survival of S. sclerotiorum sclerotia to almost zero after 2 months of incubation. The sclerotia were parasitized by T. atroviride fungus multiplied on granulates. The detrimental effect of granulates on Ch. thielavioides was observed after 4 months of incubation. The granulates, with Trichoderma and without the fungus, caused a decrease of the pathogen population in soil. Trichoderma atroviride introduced into the soil as a conidia suspension did not decrease the amount of Ch. thielavioides but the fungus parasitized S. sclerotiorum sclerotia. After the addition of granulated waste material, an increase of bacteria, especially the Pseudomonas group in the soil was observed.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A strategy of chemical control of Apera spica-venti L. resistant to sulfonylureas traced on the molecular level
    Autorzy:
    Stankiewicz-Kosyl, M.
    Wrochna, M.
    Salas, M.
    Gawronski, S.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/65897.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chemical control
    control strategy
    Apera spica-venti
    silky bentgrass
    silky bent grass zob.silky bentgrass
    resistance
    weed control
    sulphonylurea
    molecular level
    Opis:
    Three populations of silky bent grass (Apera spica-venti L.) were tested – one that is susceptible and two that are resistant to sulfonylureas. Th is study assessed the efficacy of control by different herbicides in a pot experiment and estimated the molecular status of resistance to sulfonylureas in analysed populations and its effect on the effi cacy of different chemical treatments. The three most effective herbicide rotation schemes were: 1) chlorsulfuron + isoproturon, ethametsulfuron + metazachlor + quinmerac, chlorsulfuron + isoproturon; 2) prosulfocarb + difl ufenican, ethametsulfuron + quizalofop-p-ethyl, prosulfocarb + diflufenican; 3) diflufenican + flufenacet, quizalofop-p-ethyl, diflufenican + flufenacet. In most cases it was more difficult to destroy 100% of the resistant population from Modgarby where the majority of plants had no mutation in the als gene. In the resistant population from Babin there were signifi cantly more individuals with mutation in the als gene, therefore exhibiting target-site resistance.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the structure of an intelligent locomotive DSS and assessment of its effectiveness
    Autorzy:
    Gorobchenko, Oleksandr
    Nevedrov, Oleksandr
    Powiązania:
    https://bibliotekanauki.pl/articles/1833630.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intelligent locomotive
    intelligent system
    assessment effectiveness
    control strategy
    train
    inteligentna lokomotywa
    inteligentny system
    ocena sprawności
    strategia kontroli
    pociąg
    Opis:
    The purpose of the article is developing the locomotive structure of intellectual system of support of decision-making and to find a criterion by which to adequately assess different control action to the train. System of decision support for locomotive crew is seen as a complex structure with complex interactions located at a great distance, on-board locomotive systems. The quality of the organization determines the effectiveness of the system as a whole. To solve the problem of creating the optimal structure of the DSS applies the aggregate-decomposition method that involves two steps: decomposition of the problem into a number of subproblems and aggregating the partial results. To evaluate the quality control of a locomotive used the concept of control strategy with specific indicators. Design is developed and structure of locomotive DSS is obtained, taking into account peculiarities of operation of railway transport. To account for not only quantitative but also qualitative characteristics of activity of the locomotive or intellectual systems of decision support, it is proposed to use methods of fuzzy logic. So were able to deduce and calculate the additive criterion of the quality control activities of the intelligent system. Formal indicator of the quality of the train control process using different strategies is received. In the work theoretically grounded definition of the weighting factors for each partial criterion of the quality of train control. Using the dependencies derived, the nature of the influence of the value of partial criteria on the quality of train control in relation to a strategy. The results of the work allow to more accurately simulate the operations of a locomotive crew, which in the future will serve as the basis for the development of autonomous intelligent systems of locomotive control. The developed method is shown to be three main criteria which values the safety, energy consumption, and execution time schedule. However, for more flexible and accurate model, this approach allows to enter additional criteria, and the simplicity of the calculation provides the necessary speed when implemented on on-board locomotive computers.
    Źródło:
    Archives of Transport; 2020, 56, 4; 47-58
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Varietal resistance of potatoes to late blight and chemical protection strategy
    Autorzy:
    Kapsa, J
    Powiązania:
    https://bibliotekanauki.pl/articles/66660.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Phytophthora infestans
    late blight
    genetic resistance
    chemical protection
    fungi
    resistance
    potato
    chemical control
    protection strategy
    Opis:
    The genetic resistance of potato varieties can be utilized to lower the fungicide rates used for plant protection against late blight. The very resistant varieties can be protected with half the rate of fungicide without negative effect on efficiency of the control.
    Odporność genetyczna odmian ziemniaka może być wykorzystana do zmniejszania dawek fungicydów, stosowanych w ochronie plantacji ziemniaka przed zarazą. Odmiany bardzo odporne (Meduza) mogą pozostawać niechronione lub mogą być chronione fungicydami, stosowanymi w dawkach zmniejszonych o połowę (dla uniknięcia problemów ewentualnie zwiększonej presji infekcyjnej patogena w ciągu okresu wegetacji). Uzyskane wyniki wskazują, że odmiany podatne na zarazę (Karlena) wymagają ochrony prowadzonej w pełnych zalecanych dawkach fungicydów w każdym roku, niezależnie od presji infekcyjnej patogenu. Dla niektórych odmian, nawet o średniej odporności (Panda) wystarczające są dawki zmniejszone do 50-75% by skutecznie hamowały rozwój zarazy w niektóre lata. Różne odmiany mogą reagowa w różny sposób na zmniejszanie dawek fungicydów. W przeprowadzonych badaniach stwierdzono istotne współdziałanie odmian i dawek fungicydowych. Uwzględnienie genetycznej odporności odmian ziemniaka na zarazę pozwala obniża dawki stosowanych fungicydów, z zachowaniem zadawalającej skuteczności ochrony, co może by ważne ze względu na ochronę środowiska.
    Źródło:
    Journal of Plant Protection Research; 2002, 42, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal production of electrolytic copper determined by the concentration and distribution of copper concentrates to smelters on the example of KGHM
    Optymalizacja produkcji miedzi elektrolitycznej poprzez system wzbogacania i dystrybucji koncentratów do hut na przykładzie KGHM
    Autorzy:
    Saramak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/351479.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja
    strategia produkcji miedzi
    programowanie nieliniowe
    sterowanie
    modelowanie
    optimization
    copper production strategy
    nonlinear programming
    process control
    modelling
    Opis:
    The issues of copper production strategy for the Polish copper industry are presented in the article. The problem is considered within the scope of the ore extraction, ore concentration and metallurgical processing of the copper concentrate and the main aim is to produce the specific amount of copper, which generates maximum technological and economic benefits. In order to determine the strategy of production for a company an optimisation approach may be applied with the target function defined as either the maximization of metal recovery or the maximization of profit. The real operating conditions are implemented into the model, together with existing limitation resulting from the concentration technology and metallurgical treatment. The problem verification was possible with using of non-linear programming theory. Two variants were considered: the first for lower production costs, and the second for low stock market prices. The presented optimal strategies determine the copper grades of concentrates as well as the system of concentrates distribution between three smelters. Generally smelters should receive concentrates with higher copper grades for low stock market metal prices and for low processing costs the mass of concentrates delivered to smelters should be higher together with decreased the copper grades.
    W pracy przedstawiono zagadnienia dotyczące strategii produkcji miedzi elektrolitycznej dla polskich warunków produkcji miedzi w układzie kopalnia-zakład przeróbczy-huta miedzi. Problem jest rozpatrywany głównie z punktu widzenia hut miedzi, ale determinowany jest jakością i ilością koncentratów miedziowych wyprodukowanych przez zakłady przeróbcze. Celem jest osiągniecie maksymalnych efektów technologicznych i ekonomicznych. Podejście optymalizacyjne zakłada zbudowanie odpowiedniego modelu ekonometrycznego z funkcja celu zdefiniowaną jako maksymalny odzysk metalu oraz uwzględnieniem istniejących realnych ograniczeń technologicznych Weryfikacja modelu jest możliwa z wykorzystaniem oprogramowania działającego w oparciu o teorię programowania nielinowego. W artykule przedstawiono analizę dla dwóch wariantów produkcji miedzi: niskich kosztów produkcyjnych oraz niskich cen giełdowych miedzi. Aby maksymalizować funkcję celu w zaprezentowanym modelu, w okresie niskich cen produkcji huty powinny otrzymywać mniej koncentratów o wyższej zawartości miedzi, natomiast przy niskich giełdowych cenach miedzi, huty powinny przerabiać większe ilości koncentratu o zmniejszonej zawartości miedzi.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 3; 619-626
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of production control in just-in-time delivery system conditions
    Model sterowania produkcją w warunkach dostaw w systemie Just-in-Time
    Autorzy:
    Kozłowski, E.
    Gola, A.
    Świć, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/175919.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production control
    just-in-time strategy
    optimization
    planning fixed horizon
    sterowanie produkcją
    strategia Just in Time
    optymalizacja
    określony horyzont planowania
    Opis:
    The article presents the mathematical model of production control in the Just-in-time delivery system’s conditions for a planning fixed horizon. The aim of the control model is to determine the demand for means of production (materials, labour force) at the right moment of time. The stochastic model of appearing the fault products was taking into account. Minimization both the costs of manufacturing and possible penalties connected with the incomplete execution of the order was taken as a criterion of optimization process.
    W pracy przedstawiono matematyczny model sterowania produkcją w warunkach dostaw w systemie Just-in-time, w określonym horyzoncie czasowym. Model sterujący określa zapotrzebowanie na środki produkcji (materiały, siła robocza) w zdefiniowanych momentach czasu. Pod uwagę wzięto stochastyczny model występowania wyrobów wadliwych w procesie produkcyjnym. Jako kryterium optymalizacji rozważano minimalizację kosztów produkcji oraz ewentualnych kar związanych z niepełną realizacją zamówień.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 1; 77-88
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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