Mathematical Model of Weather Conditions Influence on Properties of Photovoltaic Installation and Method of its Identification

2019 ◽  
Author(s):  
Mykola Dyvak ◽  
Krzysztof Gorecki ◽  
Janusz Zarebski ◽  
Natalia Porplytsya ◽  
Jacek Dqbrowski ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Weather Conditions

scholarly journals MATHEMATICAL MODEL OF IMPLEMENTATION OF FIRE TASKS BY TANK CREW ON THE BATTLEFIELD

2020 ◽  
Vol 2 (36) ◽  
pp. 63-69
Author(s):  
D. Khaustov ◽  
◽  
Ya. Khaustov ◽  
V. Sokolovskij ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Markov Chain ◽  
Full Range ◽  
Weather Conditions ◽  
Observation System ◽  
Extended Model ◽  
Sequence Of Events ◽  
Functional Scheme ◽  
Adverse Weather ◽  
The Impact

Reconnaissance and defeat of enemy targets on the battlefield depends on the technical characteristics of surveillance and sighting devices, and it is important to ensure their effective operation, during both the day and night, especially in adverse weather conditions. Therefore, in the field of modernization and development of surveillance and sighting devices, by both domestic and foreign manufacturers, in recent years there has been a major trend towards the development of multi-channel sighting systems on armored vehicles. To determine the optimal parameters of the sighting systems of armored vehicle samples, it is necessary to develop a mathematical model that would take into account the entire process of target reconnaissance, including the impact of full range of natural and man-made obstacles, to determine the ways for the improvement of combat effectiveness of weapons samples. In this work, a mathematical model is developed for description of fire tasks execution on the battlefield by a tank crew, which is equipped with a multi-channel sight-monitoring system, to assess the work of the sighting system as whole as well as of each of its channels. The analysis of the functional scheme of solving the combat task shows that the stage of data acquisition should be divided into, at least three, separate states, namely: detection, recognition and identification such that the transitions between these states will be described by the corresponding probabilities. The developed model describes the sequence of events that in terms of probability theory form a Markov chain. The proposed analytical Markov model allows for modeling the solution of fire tasks by the tank crew equipped with a multi-channel sighting and observation system with separate consideration of the stages of target reconnaissance, its recognition and identification, which in turn are considered as separate states of the Markov chain. The model opens a possibility for the development of an extended model to determine a quantitative indicator to assess the effectiveness of a given sighting system in comparison with its analogs.

scholarly journals Ship’s Operational Speed on the Planned Ocean Route in Real Weather Conditions

2018 ◽  
Vol 1 (1) ◽  
pp. 159-166
Author(s):  
Tadeusz Szelangiewicz ◽  
Katarzyna Żelazny
Keyword(s):  
Mathematical Model ◽  
Computer Systems ◽  
Weather Conditions

Abstract While operating the ship, one of the most important tasks is forecasting the ocean route. For this purpose, the speed characteristics of the ship are used, which are used in specialized computer systems and presented in publications. However, published algorithms for speed (or decrease of speed) calculations of a ship in real weather conditions on given routes are very simplified and do not contain all the relevant parameters related to the ship’s hull (affecting its resistance when sailing, eg on waves), its propulsion and weather conditions. The article presents its own, more detailed mathematical model of the speed of the ship, and the performed calculations of speed of the ship were compared with the algorithms available in the literature and with the records from the ship’s log.

scholarly journals Mathematical model for calculating fuel consumption in real effect weather for a vehicle vessel

2019 ◽  
Vol 2 (1) ◽  
pp. 367-374
Author(s):  
Tadeusz Szelangiewicz ◽  
Katarzyna Żelazny
Keyword(s):  
Mathematical Model ◽  
Fuel Consumption ◽  
Weather Conditions ◽  
Operating Speed ◽  
Real Effect ◽  
Ship Operation

Abstract During ship operation, one of the most important tasks is forecasting the ocean route. One of the criteria for forecasting is the minimum fuel consumption. Fuel consumption and associated emissions are also very important for other criteria. In common use, as well as in various publications, the results of calculations of fuel consumption obtained from simplified algorithms are presented. The article presents a mathematical model for calculating fuel consumption for a floating vessel in various weather conditions. In this model different criteria for controlling the propulsion engine were used by changing the fuel dose. The results of the calculations included include: fuel consumption, power of the propulsion engine and operating speed of the ship in varying weather conditions

scholarly journals Deep Diving with the Use of a Crabe Rebreather

2015 ◽  
Vol 51 (2) ◽  
pp. 11-24
Author(s):  
Ryszard Kłos
Keyword(s):  
Mathematical Model ◽  
Weather Conditions ◽  
Depth Range ◽  
Deep Diving

Abstract The article provides the results of 31 experimental dives carried out within the depth range of H ∈ [60; 80] mH2O. A combined mathematical model for ventilation and decompression was proposed with the possibility of an emergency omission of the last station at 3 mH2O and decompression completion at 6 mH2O in the event of a deterioration in weather conditions.

scholarly journals Experimental and Theoretical Analysis of a Mono PV Cell with Five Parameters, Simulation Model Compatible with Iraqi Climate

2020 ◽  
Vol 27 (1) ◽  
pp. 54-64
Author(s):  
Bdoor Majed Ahmed ◽  
Nibal Fadel Farman Alhialy
Keyword(s):  
Mathematical Model ◽  
Solar Radiation ◽  
Ambient Temperature ◽  
Weather Conditions ◽  
Included Study ◽  
Standard Test ◽  
Solar Panel ◽  
Solar Panels ◽  
Proposed Model ◽  
The Mathematical Model

The present work included study of the effects of weather conditions such as solar radiation and  ambient temperature on solar panels (monocrystalline 30 Watts) via proposed mathematical model, MATLAB_Simulation was used by scripts file to create a special code to solve the mathematical model , The latter is single –diode model (Five parameter) ,Where the effect of ambient temperature and solar radiation on the output of the solar panel was studied, the Newton Raphson method was used to find the  output current of the solar panel and plot P-V ,I-V curves, the performance of the PV was determined at Standard Test Condition (STC) (1000W/m2)and a comparison between theoretical and experimental results were done .The best efficiency  ranging from 0.15 to 0.16. With a particularly, error about (-0.333) for experimental power (30 Watt) comparing with theoretical power (30.1), through these results it is concluded the validity of the proposed model. This model can be used for all types of photovoltaic panels and also with larger output power.

The Optimum Tilt Angles and Orientations of PV Claddings for Building-Integrated Photovoltaic (BIPV) Applications

2005 ◽  
Vol 129 (2) ◽  
pp. 253-255 ◽  
Author(s):  
Hongxing Yang ◽  
Lin Lu
Keyword(s):  
Mathematical Model ◽  
Solar Radiation ◽  
Tilt Angle ◽  
Power Output ◽  
Weather Conditions ◽  
Incident Solar Radiation ◽  
Pv Array ◽  
Building Integrated Photovoltaic ◽  
Pv Modules ◽  
Local Weather

The tilt and azimuth angles of a photovoltaic (PV) array affect the amount of incident solar radiation exposed on the array. This paper develops a new mathematical model for calculating the optimum tilt angles and azimuth angles for building-integrated photovoltaic (BIPV) applications in Hong Kong on yearly, seasonal, and monthly bases. The influence of PV cladding orientation on the power output of PV modules is also investigated. The correlations between the optimum tilt angle and local weather conditions or local environmental conditions are investigated. The results give reasonable solutions for the optimum tilt angles for BIPV applications for both grid-connected and stand-alone systems.

scholarly journals A Parametric Study of a Solar-Assisted House Heating System with a Seasonal Underground Thermal Energy Storage Tank

2020 ◽  
Vol 12 (20) ◽  
pp. 8686 ◽  
Author(s):  
Le Minh Nhut ◽  
Waseem Raza ◽  
Youn Cheol Park
Keyword(s):  
Mathematical Model ◽  
Energy Storage ◽  
South Korea ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage Tank ◽  
Fossil Fuels ◽  
Weather Conditions ◽  
Heating System ◽  
Thickness Effect

The requirement for energy is increasing worldwide as populations and economies develop. Reasons for this increase include global warming, climate change, an increase in electricity demand, and paucity of fossil fuels. Therefore, research in renewable energy technology has become a central topic in recent studies. In this study, a solar-assisted house heating system with a seasonal underground thermal energy storage tank is proposed based on the reference system to calculate the insulation thickness effect, the collector area, and an underground storage tank volume on the system performance according to real weather conditions at Jeju Island, South Korea. For this purpose, a mathematical model was established to calculate its operating performance. This mathematical model used the thermal response factor method to calculate the heat load and heat loss of the seasonal underground thermal energy storage tank. The results revealed that on days with different weather conditions, namely, clear weather, intermittent clouds sky, and overcast sky, the obtained solar fraction was 45.8%, 17.26%, and 0%, respectively. Using this method, we can save energy, space, and cost. This can then be applied to the solar-assisted house heating system in South Korea using the seasonal underground thermal energy storage tank.

scholarly journals STUDY AND SIMULATION OF THE FUEL CONSUMPTION OF A VEHICLE WITH RESPECT TO AMBIENT TEMPERATURE AND WEATHER CONDITIONS

2020 ◽  
Vol 7 (1) ◽  
pp. 24-35
Author(s):  
Mbelle Bisong Samuel ◽  
Paune Felix ◽  
Youmene Nongosso Miguel ◽  
Tambere Samam Cyrille ◽  
Pierre Kisito Talla
Keyword(s):  
Mathematical Model ◽  
Ambient Temperature ◽  
Fuel Consumption ◽  
Weather Conditions ◽  
The State ◽  
Microsoft Excel ◽  
Greenhouse Emissions ◽  
Standard Operating ◽  
Main Factors ◽  
The Impact

The consumption of fuel in vehicles depends on many factors such as the state of the roads, the state of the engine and the driver’s behavior. A mathematical model for evaluating vehicle fuel consumption on a 100 km interval at standard operating weather conditions was developed. This mathematical model developed took into consideration many factors, but the main factors were those related to weather conditions and temperature. Here a new simulation program for determining the influence of temperature and weather conditions on fuel consumption is built using the software Matlab. For efficient simulations the model uses a set of data for an SUV and then makes varying only the parameters that are related to weather and temperature for the simulation. During the simulation process, a set of 10 vehicle models and 8 roads conditions were chosen to run down the simulations and only the parameters of temperature, the drag coefficient and coefficient of rolling resistances respectively were subjected to variations during each of the simulations. Upon simulation, different results were obtained for the different parameters considered. For every 15% drop in temperature, 0.1litre, 0.12litre and 0.04litre increase in fuel consumption for the set of parameters chosen was noticed. These results were analyzed and interpreted with the help of Microsoft Excel and were found to be satisfactory given that it permits manufacturers and car users to have a notion of the impact of ambient temperature and weather conditions on fuel consumption, thereby promoting optimum usage of fuel, hence reducing the effect of greenhouse emissions in the atmosphere.

scholarly journals ЭФФЕКТИВНОСТЬ И ЕДИНСТВО ПОСЕВНЫХ И УБОРОЧНЫХ КОМПЛЕКСОВ В ЗЕРНОВОМ ПОДКОМПЛЕКСЕ

2019 ◽  
Author(s):  
N.V. Byshov ◽  
V.A. Makarov ◽  
O.V. Makarova ◽  
S.V. Gasparyan ◽  
A.V. Shemyakin
Keyword(s):  
Mathematical Model ◽  
Cost Function ◽  
Systematic Approach ◽  
Weather Conditions ◽  
Tabular Form ◽  
Work Intensity ◽  
Daily Work ◽  
Work Plan ◽  
Grain Crops ◽  
The Cost

В статье используется системный подход при рассмотрении проведения полевых работ посадочными и уборочными комплексами. Установлено, что для полноценного использования возможностей посадочных и уборочных комплексов при минимальных затратах механизированные работы необходимо проводить при максимальных значениях коэффициентов использования сменного времени. В табличной форме представлены значения коэффициентов использования сменного времени для условий Нечернозёмной зоны России. Выбор стратегии проведения работ определяют скорость созревания, погодные условия, наличие технических средств. Предлагаются численные составы посадочных и уборочных комплексов в расчёте на 1 га, которые представляются в табличной форме при агрегатировании с тракторами класса 1,423. Оценка эффективности функционирования комплексов должна строиться с учетом деятельности всех подсистем по выполнению плана работ. Такой оценкой ежедневной работы комплекса может служить коэффициент напряженности работ, равный отношению сумм фактически выполненных работ к запланированным,. В выводах установлены пути совершенствования механизированных процессов на посеве и уборке зерновых культур, а в качестве оптимального варианта выбран вариант максимального использования времени смены за счет внедрения новых организационнотехнических форм. В итоге разработана математическая модель функционирования посевных и уборочных комплексов при производстве зерновых культур для Нечернозёмной зоны России, которая может быть использована и для других регионов.The article uses a systematic approach when considering the management of planting and harvesting subcomplexes. It has been established that in order to fully utilize the capabilities of planting and harvesting complexes while minimizing the cost function, it should be carried out at maximum values of utilization factors of replaceable time. The tabular form presents the values of the utilization factors of the replaceable time for the conditions of the Nonchernozem zone of Russia. The choice of work strategy determines the speed of ripening, weather conditions, the availability of technical means. The numerical compositions of the planting and harvesting complexes are calculated for 1 ha and are presented in tabular form for the composition of the aggregates when aggregated with tractors of class 1,4,2,3. Evaluation of the functioning of the complexes should take into account the activities of all subsystems for the implementation of the work plan. Such an assessment of the daily work of the complex can serve as a coefficient of work intensity, equal to the ratio of the amounts of work actually performed to the planned, calculated per machine i. The conclusions set out ways to improve the processes at sowing and harvesting grain crops, and as the main option, an option was chosen to improve the use of shift time by introducing new organizational and technical forms. As a result, a mathematical model of the functioning of sowing and harvesting complexes in the production of grain crops for the Nonchernozem zone of Russia has been developed, which can be used for other regions.

Sign in / Sign up

Export Citation Format

Share Document