Temat: mathematical model - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Model of the water-hammer effect considering a spring safety valve
Autorzy:: Niełacny, M.
Tematy:: water hammer
mathematical model; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:: https://bibliotekanauki.pl/articles/241333.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a method for calculating the water-hammer effect in a hydraulic system with a spring safety valve. A model of the valve including its dynamic functioning is presented. The developed model, enables simulation testing in order to estimate the influence of construction parameters of the spring activated safety valve on pressure changes and on the velocity of fluid flow along the pipe.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental analysis of gravitational heat pipe using R507 as a working fluid
Autorzy:: Wojtasik, K.
Zajączkowski, B.
Tematy:: thermosyphon
mathematical model
heat transfer; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1818146.pdf Link otwiera się w nowym oknie
Opis:: The paper presents possibility of using R507 as a working fluid in gravitational heat pipe. The outcome of experimental analysis are compared to the results obtained with mathematical model. The simulations allow to calculate fluid and wall temperatures in the thermosyphon. The model equations contain the formulas for boiling and condensing heat transfer coefficients. Proposed new model is in good agreement with real operation of the device, especially at the steady state. There are discrepancies during the start-up process, but the differences between the results obtained by the model and experiments do not exceed 5% at the steady state. The thermal efficiency of the thermosyphon is also determined as 0.63.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Determination of the noise source height based on the vehicle types
Autorzy:: Melnyk, Mykhaylo
Kernyskyy, Andriy
Lobur, Mykhaylo
Łukaszewicz, Andrzej
Tematy:: noise
mathematical model
vehicles
traffic; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/chapters/32304177.pdf Link otwiera się w nowym oknie
Opis:: In this work, we present a developed mathematical model for determining the height of a dominant noise source in a transportation flow of vehicles. The theoretical approach proposed in publications which uses road noise forecasting methods to improve the accuracy of methods for determining the noise barriers effectiveness was experimentally substantiated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Cellular automata as an effective tool for modelling of biofilm morphology
Autorzy:: Skoneczny, S.
Tematy:: model matematyczny
biofilm
mikroorganizm
mathematical model
microorganisms; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/208119.pdf Link otwiera się w nowym oknie
Opis:: Mathematical model of the biofilm growth and morphology dynamics has been presented based on the cellular automata theory. All processes occurring in a biofilm have been modelled in a discrete manner. The two-dimensional distributions of microorganisms density and concentrations of substrates were obtained from the simulation. One-dimensional distributions of microorganisms density and biofilm porosity dependent on the growth time have been determined. It was shown that the biofilm morphology varies significantly over the process time. This phenomenon can be used for determining the age of a growing biofilm.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Korelacja modeli matematycznych parametrów sensorycznych ze strukturą kinematyczną manipulatora typu ręka człowieka HAND-K3
Correlation of the sensory parameters mathematic models with the kinematic structure of the hand-k3 hand type manipulator
Autorzy:: Handke, A.
Twaróg, W.
Tematy:: model matematyczny
manipulator
sterowanie
mathematical model
control; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/387421.pdf Link otwiera się w nowym oknie
Opis:: Praca dotyczy funkcyjnego powiązania zbioru modeli matematycznych sieci czujników nacisku rozmieszczonych w grupach na modułach palców manipulatora, z konfiguracją jego połączeń ruchowych w czasie. Opracowane modele matematyczne wyprowadzonych parametrów sensorycznych, w układzie współrzędnych ustalonego środka części dłoniowej manipulatora, posłużyły do przeprowadzania serii pomiarów i doświadczeń oraz wyznaczenia kluczowych kryteriów wykorzystanych przy optymalizacji struktur kinematycznych manipulatorów typu ręka człowieka. Celem pracy jest stworzenie zbioru funkcji i przekształceń znanych zależności z zakresu teorii manipulatorów, koniecznych do wyznaczenia reguł sterowania ruchem modułów palców prototypu manipulatora typu ręka człowieka HAND-K3 w kontakcie z badanymi obiektami.
This paper refers to functional connection of set of mathematical models of tactile sensor array disposed in groups of each finger phalanx in the prototype manipulator with the configuration of its motor connections in time. Correlation of previously elaborated mathematic model of the sensor array in meta- carpus’s coordinate system of the manipulator’s hand served for conducting series of experiments, measurements and establishing key criteria used in the optimizing process of the hand type manipulator’s kinematic structure. The main goal of this work is to generate a set of functions and transformations common in the theory of manipulator’s, essential in designating rules in controlling the movement of finger modules in the HAND-K3 hand type manipulator prototype in interaction with examined objects.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effective aggregating of tractors for transportation
Racjonalne agregatowanie ciągników do transportu
Autorzy:: Dimitrov, P.
Simenov, D.
Stoyanov, K.
Kangalov, P.
Tematy:: traktor
model matematyczny
transport
tractor
mathematical model; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/375070.pdf Link otwiera się w nowym oknie
Opis:: The paper discusses the importance of tractors for the technological and transportation activities in agriculture. It also presents a methodological approach and an algorithm based on the criteria for the full utilization of the tractors' gravity and power for the successful aggregating of tractors when performing these activities. The offered mathematical model makes it possible to determine the sphere of full aggregation of tractors in transport within the broad range of change of the production conditions' indicators with the help of board computers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Optimizing the use of the PHYTOTOXKIT test to assess the toxicity of soil contaminated with creosote
Autorzy:: Kucaj, W.F.
Rygielski, K.
Cybulska, K.
Tematy:: phytotoxicity
plants
creosote
mathematical model; Pokaż więcej
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Powiązania:: https://bibliotekanauki.pl/articles/971611.pdf Link otwiera się w nowym oknie
Opis:: Soil phytotoxicity studies were performed with different doses of creosote by means of the PHYTOTOXKIT test, using Sinapis alba, Lepidium sativum, Sorghum saccharatum as test plants. The obtained results indicate highly signifiant effect of the creosote dose, duration of soil incubation, type of test plant and period, after which the root length measurement was performed during the phytotoxicity index root test. The analysis of results indicates the highest sensitivity of Sorghum saccharatum to creosote and the highest correlation of results obtained with the aid of Lepidium sativum when measuring the root length after the fist day the seeds are lined with the size of the dose. The proposed mathematical model makes it possible to predict the reaction of test plants on the size of creosote dose as well as to assess its amount in the soil based on the root phytotoxicity. These results allow for a signifiant simplifiation of the test and shorten its duration. This allows the modifid test to be used for simple monitoring of not only the phytotoxicity but also the creosote residues during reclamation of contaminated soil.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Simulation of operation modes of isochronous cyclotron by a new interative method
Autorzy:: Taraszkiewicz, R.
Talach, M.
Sulikowski, J.
Doruch, H.
Norys, T.
Sroka, A.
Kiyan, I.
Tematy:: cyclotron
operation mode
mathematical model; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148258.pdf Link otwiera się w nowym oknie
Opis:: Operation mode simulation methods are based on selection of trim coil currents in the isochronous cyclotron for formation of the required magnetic field at a certain level of the main coil current. The traditional current selection method is based on finding a solution for all trim coils simultaneously. After setting the calculated operation mode, it is usually necessary to perform a control measurement of the magnetic field map and to repeat the calculation for a more accurate solution. The new current selection method is based on successively finding solutions for each particular trim coil. The trim coils are taken one by one in reverse order from the edge to the center of the isochronous cyclotron. The new operation mode simulation method is based on the new current selection method. The new method, as against the traditional one, includes iterative calculation of the kinetic energy at the extraction radius. A series of experiments on proton beam formation within the range of working acceleration radii at extraction energies from 32 to 59 MeV, which were carried out at the AIC144 multipurpose isochronous cyclotron (designed mainly for the eye melanoma treatment and production of radioisotopes) at the INP PAS (Kraków), showed that the new method makes unnecessary any control measurements of magnetic fields for getting the desired operation mode, which indicates a high accuracy of the calculation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Mathematical model for logistic control in industrial cluster
Autorzy:: Simon, M.
Tematy:: cluster
cooperation
logistics
mathematical model; Pokaż więcej
Wydawca:: Polskie Towarzystwo Promocji Wiedzy
Powiązania:: https://bibliotekanauki.pl/articles/117792.pdf Link otwiera się w nowym oknie
Opis:: Entry of the Czech Republic into the European Union (EU) means an expressive expansion of space for European integrated logistics development and application. Basically logistics changes are necessary if the companies and also state in the Czech Republic do not want to be an outsider on the European market. Logistics is one of the important points of enterprise within a cluster. Cooperation of cluster members on the field of logistics for involved companies means a substantial advantage which companies will gain against their competitors not only on the native but also on the foreign markets. Conclusions of the research of mathematical model for logistic control in an industrial cluster are the critical points of this paper. This mathematical model shows the main logistic advantages for cluster members.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Minimization of power losses of a wound rotor synchronous motor for traction drives using lolimot approximation of the magnetizing characteristics
Autorzy:: Barinberg, V.
Micek, P.
Shaaban, S.
Tematy:: power losses
WSM
PSM
mathematical model; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Powiązania:: https://bibliotekanauki.pl/articles/1197501.pdf Link otwiera się w nowym oknie
Opis:: Over the last years, there has been a rising interest in wound-rotor synchronous motors (WSM) for electric vehicle drive application. They provide analternative to permanent magnet motors (PSM) which are subject to shortage issues with the rare-earth material supply [5]. Although an analytical solution of the WSM minimum copper losses problem exists [1], the associated assumptions of unlimited voltage and constant motor inductances are mostly not applicable for electric vehicle applications. This paper proposes a simple method to improve the convergence of a numerical solution of the copper loss minimization problem subject to a nonlinear equality constraint (motor torque) and inequality constraints (available voltage and maximum current). A set / tree of weighted locally linearized (LoLiMoT) models replaces nonlinear lookup tables specifying the inductances Ld, Lq, Lf in terms of the currents Id, Iq and If. A benefit of this is that the analytical expressions for the Jacobian and the Hessian matrices of the objective function and the constraints functions are readily available to a gradient-based numericaloptimization function. The calculation results presented in the paper show a reduction of the necessary number of iteration steps. In addition, straightforward modification of the presented method allows optimization also under consideration of magnetic losses.
Dostawca treści:: Biblioteka Nauki

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