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    Wyświetlanie 1-5 z 5
    Tytuł:
    Design of brake force distribution model for front-and-rear-motor-drive electric vehicle based on radial basis function
    Autorzy:
    Sun, B.
    Zhang, T.
    Gao, S.
    Ge, W.
    Li, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/224023.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicle
    motor drive
    front-and-rear-motor-drive
    brakes force
    brake force distribution
    pojazd elektryczny
    napęd silnikowy
    napęd silnikowy przedni i tylny
    siła hamowania
    rozkład siły hamowania
    Opis:
    To achieve high-efficiency and stable brake of a front-and-rear-motor-drive electric vehicle (FRMDEV) with parallel cooperative braking system, a multi-objective optimal model for brake force distribution is created based on radial basis function (RBF). First of all, the key factors, which are the coefficient of brake force distribution between the front and rear shafts, the coefficient of brake force distribution at wheels, the coefficient of regenerative brake force distribution between front and rear axles, that influence the brake stability and energy recovery of the FRMDEV are analyzed, the fitness functions of brake stability and energy recovery are established. Secondly, the maximum allowed regenerative brake torque influenced by the state of charge of battery is confirmed, the correction model of the optimal distribution coefficient of regenerative brake force is created according to motor temperatures. Thirdly, based on HALTON sequence method, a two-factor database, vehicle velocity and brake strength, that characterizes vehicle operation is designed. Then an off-line response database of the optimal brake force distribution is established with the use of particle swarm optimization (PSO). Furthermore, based on hybrid RBF, the function model of the factor database and the response database is established, and the accuracy of the model is analyzed. Specially, the correlation coefficient is 0.995 and the predictive error variance is within the range between 0.000155 and 0.00018. The both indicate that the multi-objective distribution model has high accuracy. Finally, a hardware-in-loop test platform is designed to verify the multi-objective optimal brake force distribution model. Test results show that the real-time performance of the model can meet the demand of engineering application. Meanwhile, it can achieve both the brake stability and energy recovery. In comparison with the original brake force distribution model based on the rule algorithm, the optimized one proposed in this paper is able to improve the energy, recovered into battery, by 14.75%.
    Źródło:
    Archives of Transport; 2018, 48, 4; 87-98
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatio-temporal risk assessment models for Lobesia botrana in uncolonized winegrowing areas
    Autorzy:
    Heit, G.E.
    Sione, W.F.
    Acenolaza, P.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/65802.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The objective of this work was to generate a series of equations to describe the voltinism of Lobesia botrana in the quarantine area of the main winemaking area of Argentina, Mendoza. To do this we considered an average climate scenario and extrapolated these equations to other winegrowing areas at risk of being invaded. A grid of 4 km2 was used to generate statistics on L. botrana captures and the mean temperature accumulation for the pixel. Four sets of logistic regression were constructed using the percentage of accumulated trap catches/grid/week and the degree-day accumulation above 7°C, from 1st July. By means of a habitat model, an extrapolation of the phenological model generated to other Argentine winemaking areas was evaluated. According to our results, it can be expected that 50% of male adult emergence for the first flight occurs at 248.79 ± 4 degree-days (DD), in the second flight at 860.18 ± 4.1 DD, while in the third and the fourth flights, 1671.34 ± 5.8 DD and 2335.64 ± 4.3 DD, respectively. Subsequent climatic comparison determined that climatic conditions of uncolonized areas of Cuyo Region have a similar suitability index to the quarantine area used to adjust the phenological model. The upper valley of Río Negro and Neuquén are environmentally similar. Valleys of the northwestern region of Argentina showed lower average suitability index and greater variability among SI estimated by the algorithm considered. The combination of two models for the estimation of adult emergence time and potential distribution, can provide greater certainties in decision-making and risk assessment of invasive species.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stan i perspektywy produkcji rzepaku w Polsce i na Ukrainie w aspekcie produkcji biopaliw transportowych
    Status and prospects of rapeseed production in Poland and Ukraine in terms of transportation biofuels production
    Autorzy:
    Izdebski, W.
    Jakubowski, Z.
    Skudlarski, J.
    Zajac, S.
    Maznev, G.E.
    Zaika, S.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/573688.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    W opracowaniu dokonano analizy stanu i perspektyw produkcji rzepaku w Polsce i na Ukrainie. W ostatnim dziesięcioleciu zarówno w Polsce, jak i na Ukrainie miał miejsce wzrost produkcji rzepaku. W Polsce rzepak jest w większości wykorzystywany na rynku krajowym, zaś Ukraina produkuje go głównie na eksport. Wzrost produkcji biopaliw jest dużą szansą dla producentów rzepaku w Polsce i na Ukrainie. Dużym zagrożeniem dla produkcji rzepaku jest decyzja Parlamentu Europejskiego dotycząca zmniejszenia produkcji biopaliw pierwszej generacji.
    The following text analyzes the status and prospects for rapeseed production in Poland and Ukraine. On the last ten years either countries – Poland and Ukraine there was an increase in the production of rapeseed. In Poland most of rapeseed is used for domestic consumption, while in Ukraine most of it is exported. Increasing of biofuel production is a huge chance for rapeseed producers in Poland and Ukraine. A major threat to rapeseed production is the decision of the European Parliament on reducing the production of first generation biofuels.
    Źródło:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2014, 14[29], 2
    2081-6960
    Pojawia się w:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of energy-size reduction to the control of circulating load in vertical spindle pulverizer
    Autorzy:
    Li, H.
    He, Y.
    Zhang, Y.
    Ge, Z.
    Xie, W.
    Wang, S.
    Li, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/110803.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    circulating load control
    response of energy-size reduction
    mixture grinding
    energy efficiency
    Opis:
    In the vertical spindle pulverizer (VSP), the large circulation ratio and high ash and sulfur contents in circulating load would result in intensive energy consumption and low grinding efficiency. Although the control of circulating load would help increase the energy efficiency, no quantitative study has been conducted due to the high temperature and pressure in the closed VSP. In this study, response of energy-size reduction to the control of circulating load was studied by the experimental simulation method. Coal mixtures with fine/coarse ratio of 11:1, 8:1 and 6:1 were ground by a lab-scale roller mill. Energy-size reductions of the coarse coal were compared to evaluate the influence of circulating load control. Results showed that the product with the coarse coal increased by 30% when the specific breakage energy was 1.0 kWht–1 as the circulation ratio decreased from 11 to 6. Meanwhile, a breakage characteristic index of the coarse coal was two times higher due to the cushioning effect of fines. Besides, decrease of circulation ratio led to increase of the breakage rate of coarse coal, and the energy saving improved by 57%. With the same energy input of 2.0 kWht-1, the yield of –0.09 mm pulverized fuel (PF) increased from 22 to 43%. Therefore, controlling the circulating load is an effective method to improve the breakage rate of coarse coal and energy efficiency for PF generation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 793-801
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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