Wind - Science topic

اصول مبانی سیم پیچی ماشین های الکتریکی

Climate change is known to greatly modify precipitation (rain, fog, etc.) on Earth. These changes, however, should also affect various meteorological factors that lead to the formation and quality of dew, such as temperature, relative humidity, wind speed, cloud cover, etc. These modifications can thus lead to either dew reduction or enhancement, d...

Transformer winding turn-to-turn fault is the prominent cause of transformer total failure, so detecting the winding fault in real time to stop the failure development in advance is imperative. However, existing techniques entailing periodic offline inspections fail to continuously monitor transformer winding states while causing extra costs due to...

Special Issue "Advance Techniques for Solar Radiation, Wind Speed and Photovoltaic Forecasting" The new open access journal Forecasting provides an interdisciplinary forum for all aspects related to the :immensely broad field of time series analysis and forecasting. The range of applications in forecasting is enormous, from energy forecasting or ec...

A presumed impact of global climate change is the increase in frequency and intensity of tropical cyclones. Due to the possible destruction that occurs when tropical cyclones make landfall, understanding their formation should be of mass interest. In 2017, Kerry Emanuel modeled tropical cyclone formation by developing a low-dimensional dynamical sy...

On 4 July 2020, a quasi-stationary band-shaped area of heavy precipitation occurred near the center of Kyushu, Japan. The contribution of shallow convection to the localization of the precipitation area is examined using the Weather Research and Forecasting model. Two turbulent transport schemes, the Yonsei University scheme and the Mellor–Yamada–N...

Most studies on floating wind turbine floaters focus on rigid-body motion analysis, while analysis of structural load effects of the floaters is lacked. However, load effect analysis of hull structures is essential for the safety design checks throughout the service lifetime. Therefore, this study carries out the analysis of the extreme internal st...

The construction of high-rise buildings has emerged as a constructive trend worldwide, and excessive vibration problems due to wind actions are becoming increasingly frequent. The Brazilian design standard NBR 6123 recommends that the transfer of wind actions used for structural analysis be carried out based on the pressure coefficients along the b...

As future floating bridges gets longer, the likelihood of significant inhomogeneous wave conditions across them increase. Consequently, a proper assessment of the effects of inhomogeneous wave conditions is needed. In this paper, we present an approach to model inhomogeneous sea states by representing the stochastic process using generalized harmon...

Sudden stratospheric warming (SSW) is a violent atmospheric disturbance in the polar region of the winter hemisphere. The drastic changes in temperature and wind during SSWs are considered to be the main reasons for the abnormal increase in the energy of atmospheric waves in the upper and middle atmosphere in the winter hemisphere. Meteor radar is...

Offshore wind power is an important technology option for decarbonising the electricity sector. An emerging region for the deployment of offshore wind is the Asia-Pacific. We conduct an expert elicitation of future cost expectations for offshore wind in the Asia-Pacific region, covering fixed-bottom and floating offshore wind technologies. We also...

Wind power forecasting plays a significant role in regulating the peak and frequency of the power system, which can improve the wind power receiving capacity. Despite plenty of forecasting methods have been proposed to fortify the accuracy of forecasting, the existing forecasting models do not consider the reconstruction of missing data and can not...

Bon religious texts dating to more-or-less a thousand years ago do contain not only signs of a well developed ‘cult of the book’, but also some unexpectedly informative passages about the book making arts. This essay concentrates on ideas about bookbinding found in early Bon ritual literature on consecration of icons, including scriptural Volumes....

Typhoon Rai struck the Philippines on the 16th December 2021, damaging and inundating many coastal areas along the Visayas region of the country due to the high winds, storm surges and wind driven waves it generated. In order to understand the various damage mechanisms, the authors conducted a field survey to measure the storm surge heights at seve...

Spatial modeling of suspended particles (TSP) and spatial relationship to dust in Baghdad governorate and environmental effects ABSITRAC Geography studies the spatial patterns present on the surface of the earth, and in this study it describes the patterns and analyzes the processes that created them, and interprets and identifies the relationship...

The Energy Efficiency Design Index (EEDI) was adopted by the International Maritime Organization (IMO) with the aim of reducing CO2 emissions from shipping. As this is a mandatory measure for all seagoing ships over 400 Gross Tonne which is becoming stringent over time, the need for economic and alternative propulsion has become more important than...

Guiding wind energy sector growth through suitability analysis is a growing priority. We present in this work a logistic regression model that predicts suitable sites for state-level and nationwide wind energy development in the United States. The model's aggregation of publicly available data to 20 different grid cell resolutions, along with four...

How the high-rise (HR) building affects the pedestrian-level wind environment (PLWE) is of great significance to urban planning. Therefore, the effects of the HR building on the wind and the thermal environments in the urban array with different planar densities are studied numerically. The planar densities are 0.25, 0.4 and 0.6. The simulation res...

621.313 В.П. ШАЙДА, О.Ю. ЮР'ЄВА, С.Є. ДЗЕНІС АНАЛІЗ ТЕПЛОВОГО СТАНУ РІЗНИХ МОДИФІКАЦІЙ РУДНИКОВОГО ТЯГОВОГО ДВИГУНА ПОСТІЙНОГО СТРУМУ ТИПУ ДТН-45/27 Проведено дослідження можливостей підвищення годинної потужності тягових двигунів постійного струму типу ДТН-45/27. Встановлено, що основним обмежувачем підвищення потужності є тепловий стан двигуна. Ш...

This paper describes the improvement in the steady-state performance of squirrel cage induction motor (SCIM) by using capacitor injected in the auxiliary winding of the modified dual stator winding SCIM. A balance capacitance load is connected at the terminals of the auxiliary winding, and by appropriate choice of the capacitor, the overall reactan...

Whitecapping dissipation is a critical term in affecting the accuracy of wave height modeling. However, the whitecapping dissipation coefficient ( C ds ), as a primary factor influencing whitecapping, is commonly determined through trial and error in various studies. In this study, we present a general method for calibrating the Simulating Waves Ne...

This chapter begins by stressing the importance of electricity as an essential element to modern life in society. The above is followed by an insight into the relevance of local energy communities, an emerging figure that can enable new ways of producing and consuming electricity for the benefit of the community. Such a structural shift must be gui...

This study investigates the performance of a magnetic energy harvesting system installed on a blade undergoing translation motion. The equations of motion are derived using Lagrange's theory and are solved numerically using the Runge-Kutta 4 method. The study is divided into two parts. In the first part, the effect of damping and wind on the blade...

Changes in temperature, precipitation, wind speed, and relative humidity due to climate change are likely to alter future fire regimes. We quantified the impact of such changes on the fire weather of Indian forests using a fire weather index and high-resolution downscaled climate projections. While conventional wisdom contends that future temperatu...

Wind erosion is a key global environmental problem. As an important protective measure to provide services to the ecosystems in wind-eroded areas, the wind erosion prevention service is of great significance to the management of wind and sand hazards and ecological environment restoration in the wind-eroded areas and the neighboring areas. Taking t...

The aerodynamics of slotted aerofoils under various Reynolds numbers were numerically studied. Moreover, vibration of aerofoils due to the wind flow was also investigated. Different Reynolds numbers (0.25, 0.4, 0.7 and 1) ×106 were utilized using an Ansys noncommercial version. A slotted asymmetric aerofoil, which was NACA4412, was chosen to implem...

The demand for electricity is continuously growing around the world and thus the need for renewable and long-lasting sources of energy has become an essential challenge. Wind turbines are considered one of the major sources of renewable electricity generation. Therefore, there is a crucial demand for wind turbine model and control systems that are...

p>This article presents a newly developed modification of the dandelion optimizer (DO). The proposed method is a chaotic algorithmic integrity and modification of the original dandelion optimizer. Dandelion is one of the plants that rely on wind for seed propagation. This article presents the tuning of the power system stabilizer with the method pr...

span lang="EN-US">The current study evaluates the wind potential at early stage of wind project using met mast and lidar. The wind data obtained from a met mast located away from the turbines can be hindered by obstacles, leading to limited coverage and height, it negatively impacting the project's performances. To address the above limitations, th...

In this study, we investigated the interannual variability of sea surface temperature (SST) along the northwest African coast and the strong Dakar Niño and Niña events, and their potential changes under the highest emission scenario RCP8.5 of global warming using a high-resolution regional coupled model. Our model accurately reproduces the SST seas...

span lang="EN-US">Today, integrating wind energy forecasting is an important area of research due to the erratic nature of wind. To achieve this goal, we propose a new model of wind speed prediction based on graph attention networks (GAT), we added a new attention mechanism and a learnable adjacency matrix to the GAT structure to obtain attention s...

span lang="EN-US">Methodology of constructing coil winding electrical circuits for salient-pole stator of electrical permanent-magnet machines on the rotor is proposed, which is based on the required number of pole pairs (synchronous speed) and the number of phases. The methodology algorithm is based on determining the value of the number of stator...

The driving torque on vertical axis wind turbines with large chord-to-radius ratio blades, typically greater than 0.5, is generated mainly by the phenomenon of dynamic stall. In order to determine the optimum configuration, an extensive experimental study was conducted on two-bladed, H-rotor test turbine, by systematically varying the blade chord-t...

The paper is a follow-up of the recent study on the assessment of discrete wind gust parameters impacting a flexible lightweight structure as a first step towards the evaluation of the worst-case scenario caused by strong wind gusts (JWEIA 231, 105207, 2022). The present study goes beyond by suggesting an optimization framework which allows to dete...

As part of a research effort towards greener aviation, this study focuses on the noise impact of aircraft operations around major airports. First, a pre-existing aircraft noise prediction platform based on a simplified (semi-empirical) approach is refined, to account for all refraction effects inherited from realistic (e.g., heterogeneous) atmosphe...

Terrestrial and extraterrestrial factors hinder the exploitation of solar power using a ground platform. This paper is concerned with the generation of solar power above ground level. This paper employs modeling and simulations coupled with experimentation to establish a functional relationship between the percentage of solar power gain, tropospher...

The purpose of this study is to find simple cost-efficient algorithms for real-time quantizing the responsibility for power quality issues in every branch in an industrial network. The study is focused on voltage sag/swell and flicker which are caused by the time variation characteristics of loads. Here by using the RMS values of the voltage and cu...

A leading cause of accidents during the landing phase of a flight lies in a considerable altitude loss by an aircraft as a result of the impact of a microburst of wind. One of the significant factors focuses primarily on the need to simultaneously satisfy various requirements regarding conditions of environmental disturbances and a wide range of sy...

With the rise of online finance, P2P online lending platforms based on new lending methods have ushered in an era of rapid development, attracting the attention and research of scholars. This paper uses platform data comes from the home of online loans, the National Bureau of Statistics of the People's Republic of China, and the Wind database, and...

Marine energy development has been actively promoted in recent years. Analyzing wave data in the surrounding sea areas is crucial for improving wave power generator efficiency. This study collected unidirectional wave spectrum data from the northeast coastal area of Taiwan (e.g., Pengjia Islet, Fugui Cape, and NTOU). It aimed to analyze the main wa...

Due to more affordable solar and wind power, and the European Union regulations for decarbonisation of the economy, more than 40% of the Fortune 500 companies have targets related to green energy. This is one of the main reasons why multi-technology Power-Purchase Agreements (PPAs) are becoming increasingly important. However, there are risks assoc...

In recent years, most of the research on typhoon in Fujian Province of China has stayed in the typhoon wave simulation under the influence of wind fields. In order to study the influence of land terrain on typhoon wave fields, the terrain height parameters are introduced into the wind field simulation through the third-generation typhoon wave numer...

Wind power is prone to dramatic fluctuations in the short term, posing a threat to the safety and stability of the grid, so accurate forecasting of ultra-short-term wind power is important to ensure the stability and economy of the power system. The historical data of wind power is an enormous and nonlinear time series. It is expected to mine the i...

Open-phase faults will lead to a large error in the estimated rotor position of the high-frequency signal injection (HFSI) based sensorless method in a dual three-phase motor (DTM) drive system, resulting in unstable performance. The previous research has proposed a senseless control method robust to the single open-phase fault (SOPF) to improve th...

In this paper, the effect of geographical location on Cyclone Global Navigation Satellite System (CYGNSS) observables is demonstrated for the first time. It is found that the observables corresponding to the same wind speed vary with geographic location regularly. Although latitude and longitude information is included in the conventional method, i...

In Morocco, with the growing wind installed capacity it becomes crucial to perform further the O&M process, the wind assets are exposed to several constraints and raindom of maintenances for incidents. The target of this work is to optimize the gross and net production while simultaneously adhering to the minimum turbine unavailability and minimizi...

The Weibull distribution is a continuous probability distribution that finds wide application in various fields for analyzing real-world data. Specifically, wind speed data often adhere to the Weibull distribution. In our study, our aim is to compare the mean wind speed datasets from different areas in Thailand. To achieve this, we proposed simulta...

In this paper, the large eddy simulation (LES) method is applied to gas diffusion process in open space under wind effect. Firstly, the governing equations of gas diffusion employed in LES are introduced, and the corresponding solution procedure is discussed. Subsequently, using LES with DSM subgrid-scale model, the diffusion process of the methane...

Integrating wind power demands more generation fleet flexibility and incurs more incidences of transmission congestion, which may impose a negative effect on how efficiently regional production is allocated among fossil fuel electricity generators (we call it “regional allocative efficiency”). Exploring exogenous variations in wind power generation...

In this paper, a double-loop tracking control strategy with finite-time convergence is investigated for a switched-trajectory quadrotor subjected to gust winds in air-ground cooperation. To handle the complexity of switched-trajectory tracking, an adaptive tracking differentiator is presented in an outer loop to arrange transition processes. Fast i...

Based on regional air pollution disparity and the trans-regional flow of inbound tourists in 31 provinces of China, this paper examines the impact of air pollution disparity on the trans-regional flow of inbound tourists. The results show that more severe air pollution in a region significantly discourages the flow of inbound tourists from other re...

span lang="EN-US">Novel technologies are adopting electric vehicles (EVs) day-by-day due to increasing interest in EVs. The charging process of EVs is a very important aspect when it is connected to the utility grid. Generally charging of an EV can be done at either home or in charging stations were connected to the utility grid. More harmonics and...

Reinforcement learning (RL) techniques have been studied for solving the conflict resolution (CR) problem in air traffic management, leveraging their potential for computation and ability to handle uncertainty. However, challenges remain that impede the application of RL methods to CR in practice, including three-dimensional manoeuvres, generalisat...

In this paper, an innovative approach for the fast estimation of the mutual inductance between transmitting and receiving coils for Dynamic Wireless Power Transfer Systems (DWPTSs) is implemented. To this end, a Convolutional Neural Network (CNN) is used; an image representing the geometry of two coils that are partially misaligned is the input of...

span lang="EN-US">Considering the ever-increasing demand for electricity and the current crisis in this sector, various ways of generating electricity have been studied. Most of them are based on hybrid technologies as a solution to replace the relevant resources during the absence. In Kosovo, as an economically poor country, such technologies are...

The global shipping sector requires deep and rapid carbon reductions within a decade to align with Paris Agreement goals. Wind propulsion offers a retrofit option where sails provide renewable power to reduce emissions from a ship's engine. Combining wind propulsion with voyage optimisation shows synergistic potential, but the underlying technical...

This article presents a newly developed modification of the dandelion optimizer (DO). The proposed method is a chaotic algorithmic integrity and modification of the original dandelion optimizer. Dandelion is one of the plants that rely on wind for seed propagation. This article presents the tuning of the power system stabilizer with the method prop...

span lang="EN-US">The doubly-fed induction generator (DFIG) has the advantages of compactness and low cost, so it has been applied more and more in practice. However, the structure of the DFIG system is complex, multivariable, nonlinear, and difficult to control. Chaos is a phenomenon that only occurs with nonlinear dynamical systems, sensitive to...

This study aims to propose a wind power prediction method that achieves high accuracy in order to minimize the impact of wind power on the power system and reduce scheduling difficulties in systems incorporating wind power. The importance of developing renewable energy has been recognized by society due to the increasing severity of the energy cris...

Wind energy's global prominence emphasizes precise wind speed modeling for effective planning amidst seasonal variations. Focusing on the coastal regions of Andhra Pradesh, this study proposes five novel mixture distribution functions: Weibull-generalized extreme value distribution (W-GEVD), gamma GEVD, lognormal GEVD, bimodal Weibull GEVD, and Wei...

The boreal winter North Pacific Oscillation (NPO) has a significant impact on the tropical Pacific large scale air-sea interaction in the following spring and summer. But it is unclear whether the boreal winter NPO is associated with the El Niño development or decaying during following summer. This study confirms the relationship between the winter...

During the review of the effect of evaporation on the change of the hydrological regime of water reservoirs, an analysis was carried out on how global climate change will lead to a change in the water reservoir regime. Taking into account the sudden increase in air temperature and the effect of wind, the evaporation process in the month of June (Ju...

The distribution system is easily affected by extreme weather, leading to an increase in the probability of critical equipment failures and economic losses. Actively scheduling various resources to provide emergency power support can effectively reduce power outage losses caused by extreme weather. This paper proposes a mobile energy storage system...

Wind turbines have existed since ancient times and helped man accomplish various tasks. The essential organ is the blade allowing the energy of the wind to be transformed into desired energy. According to its role, the choice of material for its manufacture was the subject of several researches because of the expected weight and the multiple demand...

In recent years, with the continuous improvement of motor power density, oil cooling technology has been widely used in permanent magnet synchronous motors (PMSMs) for electric vehicles (EVs) as an efficient cooling method. A PMSM with a rated capacity of 53kW for hybrid electric vehicles (HEVs) is designed, and the motor is cooled by the oil injec...

We present very long baseline interferometry (VLBI) observations of a continuum radio source potentially associated with the fast radio burst source FRB 20190520B. Using the European VLBI network, we find the source to be compact on VLBI scales with an angular size of <2.3 mas (3 σ ). This corresponds to a transverse physical size of <9 pc (at the...

Accounting for wind perturbations while controlling a formation of unmanned aerial vehicles (UAVs) is of a particular interest for researchers: it helps confirm the operability of algorithms in realistic non-laboratory conditions and increases the efficiency of these algorithms. This approach, however, becomes a problem for a decentralized formatio...

Floating offshore wind farm control via real-time turbine repositioning has a potential in significantly enhancing the wind farm efficiency. Although the wind farm power capture increase by moving platforms with aerodynamic force has been verified in a recent study, the investigation and mitigation of the fatigue damage caused by such aerodynamic f...

To improve the safety and ease of use of super-tall buildings in strong winds, aerodynamic optimization of building shapes is considered the most effective approach. Aerodynamic optimization aims to solve a problem at its source, as opposed to structural optimization, which aims to improve the wind resistance of a structure. With the advancement of...

In recent years, frequent occurrence of extreme weather events has caused great losses to the power system. Meanwhile, the high penetration of renewable energy has brought new challenges to the safe operation of the system. Coordination of various measures against different stages of disaster can effectively reduce the overall loss and enhance syst...

Developing offshore wind farms may impact cetaceans due to vessel collisions and underwater noise. Therefore, it is critical to protect cetaceans while developing offshore wind farms. We first studied the code of conduct/guidelines for whale watching and then interviewed members of the local whale-watching industry to learn about the interaction be...

Soliton-based computing relies on their unique properties for transporting energy and emerging intact from head-on collisions. Magnetic domain walls are often referred to as solitons disregarding the strict mathematical definition requiring the above scattering property. Here we demonstrate the conditions of elastic and inelastic scattering for spi...

Earth’s upper-level jet streams influence the speed and direction of travel of weather systems and commercial aircraft, and are linked to severe weather occurrence. Climate change is projected to accelerate the average upper-level jet stream winds. However, little is known about how fast (>99th percentile) upper-level jet stream winds will change....

Motivated by wind blowing over water, we use asymptotic methods to study the evolution of short wavelength interfacial waves driven by the combined action of these flows. We solve the Rayleigh equation for the stability of the shear flow, and construct a uniformly valid approximation for the perturbed streamfunction, or eigenfunction. We then expan...

The study is aimed at designing a system which ensures dock mobility (moving from the quay to the dock trench) and stabilises the dock in position during docking operations. A number of requirements and design criteria have been defined for the dock moving system, the most important of them being its capability to support docking operations at a ma...