Litteris et Artibus. – 2015 р.

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/39475

Proceedings of the 5th International youth science forum, November 26–28, 2015, Lviv, Ukraine

У збірнику опубліковано матеріали наукового форуму, присвяченого проблемам у галузі комп’ютерних наук та інженерії, інформаційних технологій; геодезії, архітектури та будівництва; енергетики та систем керування; гуманітарних та соціальних наук; машинобудування, матеріалознавства, транспорту; економіки та менеджменту; хімії та хімічних технологій; права та психології; екології, природоохоронної діяльності та туризму. Видання призначено для науковців, аспірантів, студентів.

Litteris et Artibus : proceedings of the 5th International youth science forum, November 26–28, 2015, Lviv, Ukraine / Lviv Polytechnic National University. – Lviv : Lviv Polytechnic Publishing House, 2015. – CD-ROM. – 472 p.

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Author: search.filters.author.Matiko, FedirHas files: Yes

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    Determining of volume of natural gas losses caused by damages of distribution networks
    (Lviv Polytechnic Publishing House, 2015) Dzhyhyrei, Viktor; Matiko, Fedir; Klymkovskyi, Dmytro; Lviv Polytechnic National University
    The algorithm of calculation of gas volume losses caused by damages of above-grounded pipelines is proposed in this paper. The mathematical model of natural gas movement in the pipeline is developed for the implementation of the algorithm. The model is used to determine the parameters of the gas flow at the leakage point. The equation for calculation gas flowrate through the holes in the pipeline wall is developed on the basis of the formula of Saint-Venant-Wentzel. The equation is valid for subcritical and critical regime of gas flow. The equation for determining discharge coefficient of the holes in the pipeline wall for gas pressure up to 1.2 MPa is proposed.
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    Investigation of ultrasonic flowmeter error in conditions of distortion of flow structure
    (Lviv Polytechnic Publishing House, 2015) Roman, Vitalii; Matiko, Fedir; Lviv Polytechnic National University
    Ultrasonic flowmeter error caused by distortion of flow structure has been investigated in this paper. Minimum number of acoustic chordal paths of multi-channel ultrasonic flowmeter was determined that ensures the error caused by distortion of flow structure less than the specified limits ±0.3 %. The authors used Salami velocity function as a model of distortion of flow structure. Acoustic path configurations of ultrasonic flowmeter were determined using classical numerical methods of integration of Gauss-Jacobi. The authors improved the flow rate equation of ultrasonic flowmeter by introduction of calibration coefficient that was determined using symmetric component of Salami function.
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    Mathematical modeling and experimental study of impulse lines of flowmeters
    (Lviv Polytechnic Publishing House, 2015) Fedoryshyn, Roman; Matiko, Fedir; Kostyk, Ihor; Stefurak, Khrystyna; Lviv Polytechnic National University
    Mathematical model of an impulse line with a pressure transducer (PT) was built. This model provides the possibility to simulate and analyze the transient processes in an impulse line. Experimental studies of the step response curves of an impulse line with PT were carried out with application of a high-frequency analog-to-digital converter of the pressure signal in the PT chamber. The simulated step response curves were compared to the experimental ones. Maximum relative deviation of the simulated step response curves from the experimental ones is 6.3 %.