Wyniki wyszukiwania - BazTech

1

Implementation and Analysis of Mathematical Modeled Drive Train System in Type III Wind Turbines Using Computational Fluid Dynamics

Kabat Subash Ranjan, Panigrahi Chinmoy Kumar, Ganthia Bibhu Prasad, Barik Subrat Kumar, Nayak Byamakesh

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 1

180--189

EN

This paper is based on designing a modified rotor for a drivetrain in a Type-III wind turbine system for maximum power generation to work effectively under low and high wind speed and its variation. In this paper three drive trains are designed for the gearbox to provide regulated torque and thrust force. For time to time variation in wind speed the voltage sag and during over speed condition voltage swell problem can be solved by using this modified design. The pitch control, gear box and yaw of the wind turbine basically focused for modification. Mainly the gear box for the rotor causes sluggish motion of the rotor during low wind speed. This paper explained the design of modified rotor control for the gear box in DFIG based (Type-III) wind turbine. Also in this paper how the modified rotor system can be helpful for reactive power control highlighted with comparison with existing models. For designing MATLAB Simulink platform is taken and validated using CFD mechanical design analysis. Using these types of modified drive trains maximum power for the wind turbines is enhanced by 40–60% of its reference value.

2

Calculations of Pitch at Flight for Mortar Projectiles

Magier M., Merda T.

Machine Dynamics Research

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2018

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Vol. 42, No. 4

5--16

EN

In this article, two different point mass model methods for pitch angle calculations for fin stabilized projectiles were shown and analyzed. The first method originates from the Modified Point Mass Model and was presented by McCoy. Comparison of the calculated pitch angles with the 5-degrees-of-freedom external ballistic model results has shown insufficient accuracy of the CRAWFISH-AMMUNITION shooting parameters range. Therefore, the authors presented their own method for pitch angle calculations. Comparison of methods at the wide range of entry parameters was made and has shown higher accuracy of the method developed by the authors of this article.

3

Estimation of road roughness from data of on-vehicle mounted sensors

Surblys V., Žuraulis V., Sokolovskij E.

Eksploatacja i Niezawodność

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2017

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Vol. 19, no. 3

369--374

PL

Artykuł przedstawia i ocenia metody określania nierówności nawierzchni drogi na podstawie danych z laserowych czujników pomiaru odległości. W artykule omówiono opracowane w Japonii symetryczne i asymetryczne metody określania nierówności nawierzchni, które różnią się sposobem rozmieszczenia czujników i przetwarzania danych. Badania eksperymentalne przeprowadzone na podstawie „metody japońskiej” na dwóch zadanych profilach nawierzchni pozwoliły na ocenę wpływu zawieszenia samochodu i zmian przechyłu nadwozia względem osi podłużnej na obliczanie nierówności nawierzchni. Walidacja wyników pokazała, że kompensacja odchylenia zawieszenia nie zapewnia wystarczającej dokładności pomiaru nierówności drogi, ponieważ przechyły nadwozia mają większy wpływ na przetwarzanie sygnałów rejestrowanych przez zamontowane na nim czujniki.

EN

In this work, methods of estimation of road roughness by processing data of laser sensors of distance measurement are investigated. Depending on the layout of the sensors and the processing of the data, the Japanese, symmetrical and asymmetrical roughness estimation methods are elaborated in this work. The experimental research that was carried out by “Japanese method” on two known profile road surfaces allowed evaluating the influence of the vehicle’s suspension and the body pitch rate oscillation on the calculation of the roughness. The validation of the results showed that the compensation of the suspension travel does not warrant the sufficient accuracy of the estimation of the road roughness because the pivoting of the bodywork has a greater influence on the processing of the signals recorded by the sensors attached to it.

4

Power control of a wind energy based on a DFIG by sliding mode approach and pitch angle optimal control by genetic algorithm

Belghazi O., Douiri R., Cherkaoui M.

Journal of Achievements in Materials and Manufacturing Engineering

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2016

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Vol. 74, nr 2

78--85

EN

Purpose: In this paper, a regulate of a variable wind energy conversion system, based on a doubly fed induction generator DFIG is proposed, the system we considered is controlled to generate maximum energy while minimizing loads. In low to medium wind speeds, the generator and the power converter control the wind turbine to capture maximum energy from the wind, in the high-wind-speed regions, the wind turbine is controlled to maintain the aerodynamic power produced by the wind turbine. Generator torque and Pitch angle are controlled simultaneously to maximize energy capture. Design/methodology/approach: Two methods for adjusting the aerodynamic power have been studied: For generator load control, The DFIG control structure contains rotor currents and stator powers loops where PI controllers are used. This control could be obtained by applying a DFIG active and reactive power decoupling strategy based on stator flux orientation method, Another controller based on a sliding mode theory is adopted to maximize the extracted power has been used , both of which are employed to regulate the operation of the DFIG. For the pitch control, a nonlinear controller based on artificial intelligence techniques: genetic algorithms, to regulate the blade pitch angle and rotate speed of the wind turbine system. Findings: Proposed DFIG and pitch control algorithms provide good static and dynamic performances. Validity the strategies proposed was analyzed by simulations. Originality/value: The intelligent controller is proposed to blade pitch position control above the rated wind speed in this paper; Genetic Algorithm based controller gave better results. Simulated wind turbine parameters are obtained from a real turbine and generating system. Hence, proposed controllers can be easily adapted to real time applications and operated with real wind turbines. Compared simulation results validate the proposed method in the paper is an effective method.

5

Badanie wpływu przechyłu wzdłużnego na przyspieszenie samochodu osobowego mierzone metodą bezpośrednią

Brol S.

Postępy Nauki i Techniki

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2012

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Nr 15

21-31

PL

W tej pracy podjęto temat wpływu kąta pochylenia nadwozia samochodu na wartość przyspieszenia mierzonego za pomocą czujnika przyspieszenia przymocowanego do nadwozia. Przyspieszenie mierzone jest w trakcie testu drogowego składającego się z dwóch faz rozbiegu i wybiegu. Dokonano symulacji komputerowej mierzonych wartości przyspieszenia przez czujnik w kierunku poziomym i pionowym. Porównano wyniki z zadanym przyspieszeniem samochodu. Opisano składniki błędu wskazań czujnika przyspieszenia w teście drogowym.

EN

In this work the topic of influence of pitch angle on measured acceleration using acceleration sensor fixed to car's chassis was taken into account. The acceleration is measured during road test which consists of acceleration and deceleration phases. Simulation was made of measures accelerations by sensor in horizontal and vertical directions. The results were then compared with stetted before simulation "real" car acceleration. The components of measurement error were described in aspect of road test course.

6

Wyznacznie kąta pochylenia i przechylenia w tanich systemach nawigacji lądowej

Popowski S.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2007

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z. 71 [238]

365-372

PL

Systemy nawigacji stosowane powszechnie w transporcie samochodowym zwykle sprowadzają się do układu nawigacji satelitarnej uzupełnionego prostym układem nawigacji zliczeniowej. Ten ostatni najczęściej wykonany jest w tzw. konfiguracji minimalnej, obejmującej jeden jednoosiowy giroskop światłowodowy, dwa przyspieszeniomierze i licznik drogi. W pracy przedstawiona została dyskusja metody pomiaru kątów: pochylenia i przechylenia pojazdu w takim uproszczonym systemie nawigacji. Omówiono mechanizmy powstawania błędów nawigacji, których źródłem są niedokładności pomiaru tych kątów. Przedstawione metody zostały zweryfikowane doświadczalnie podczas eksperymentów, których wynik zamieszczono w pracy.

EN

Navigation systems commonly used in automobile transport are usually limited to a satellite navigation system completed with simple dead reckoning navigation system. The latter most often is built in so called "minimal configuration" containing one single axis optic fiber gyroscope, two accelerometers and dead reckoning. The paper discusses the method of angle measurement: pitch and roll of the vehicle in such a simplified navigation system. Also the mechanism of navigation errors occurrence resulting from angle measurements inaccuracy is analysed. Presented methods were verified experimentally and the results are included in the paper.