نتایج جستجو برای: wind speed and direction

تعداد نتایج: 16879641  

Arezoo Tajmohammadi Jamshid Ghanbari,

In this work we solve the set of hydrodynamical equations for accretion disks in the spherical coordinates (r,θ,ϕ) to obtain the explicit structure along θ direction. We study a two-dimensional advective accretion disc in the presence of thermal conduction. We find self-similar solutions for an axisymmetric, rotating, steady, viscous-resistive disk. We show that the global structure of an advec...

2008
Steven Reid

Understanding some of the basic wind engineering concepts helps one understand the chimney’s response. The circular cross section of the steel chimney characteristically provides aerodynamic lift perpendicular to the wind direction. Knowing how to predict and prevent these adverse responses is of critical importance to steel chimney design. I. STATIC WIND FORCES The force exerted by wind varies...

2013
Ding Xi - bo Liang Jia - yi Liu Jian Guo Chao Wang Tong

Ultrasonic wind speed measurement technique obtains more and more extensive use in the field of Meteorology and Environmental Protection etc. When designing an ultrasound wind vector instrument, synthesizing wind vector information, containing wind velocity vector and wind angle, is of prime importance to accomplish accurate measurement. This paper presents synthesis algorithm of ultrasonic 2D ...

2013
A. Montuori

In this paper, X-band COSMO-SkyMed© synthetic aperture radar (SAR) wind field retrieval is investigated, and the obtained data are used to force a coastal ocean circulation model. The SAR data set consists of 60 X-band Level 1B Multi-Look Ground Detected ScanSAR Huge Region COSMO-SkyMed© SAR data, gathered in the southern Tyrrhenian Sea during the summer and winter seasons of 2010. The SAR-base...

2003
David Harvey Tien-Fu Lu Michael Keller

Flying insects sense the speed and direction of the wind to provide directional information used in chemical plume tracking. To model this plume tracking using a mobile robot, an appropriate wind sensor is required. This paper initially describes the design of a wind sensor for this purpose. The sensor utilises three wind speed measurement devices, thermal anemometers, to determine wind speed a...

2007
William David Lubitz Bruce R. White

Measurements of flow past simulated sinusoidal hills were taken in an atmospheric boundary layer wind tunnel (ABLWT) that modeled typical full-scale complex terrain for many wind turbine locations in the Altamont Pass, California, USA. Velocity profiles and speed-up factors for several model hills were determined. All hills modeled had the same height and sinusoidal cross-section, and length-to...

ژورنال: مهندسی دریا 2011

The goal of this study was to simulate the wave characteristics in the south of Persian Gulf over a 60 year period. Wind data from the study area including offshore measurement, satellite observation and numerical atmospheric models were collated and analyzed. The modified NCEP/NCAR wind field was chosen as input to the SWAN model which has the longest duration among wind data sources. SWAN mod...

Journal: :J. Systems & Control Engineering 2016
Alexander Stotsky

The application of conventional wind turbines on board a vessel creates a number of new challenges for turbine control systems. Thrust force is used in marine applications as an additional control variable for propulsion of the vessel. Variability of the wind speed and wind direction, together with the yaw rate and range constraints, impose strong requirements on the turbine control system. A n...

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