Results 111 to 120 of about 201 (159)

Grid Validations for Downburst Simulations

Applied Mechanics and Materials, 2012
Downbursts, which resulted from the flow downdraft in thunderstorms, have become one of the most destructive disasters to buildings including transmission towers, etc. This disaster has drawn researchers’ interests and progresses have been continuously made by employing test and numerical tools.
Hui Xue Dang, Feng Li Yang, Jing Bo Yang
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Approach guidance in a downburst

Journal of Guidance, Control, and Dynamics, 1992
We present a nonlinear feedback law for safe aircraft penetration through downbursts on landing approach. It is based on following a nominal approach path relative to the ground, subject to a minimum airspeed constraint. The guidance design uses a point-mass aircraft model and considers the flight path to be in the vertical plane.
Yiyuan Zhao, A. E. Bryson
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Thunderstorm downburst risks to wind farms

Journal of Renewable and Sustainable Energy, 2013
As has been noted in recent experiences, thunderstorms can cause damage to turbine units that are part of a wind farm because of the correlated wind inflow fields that these units can be subjected to simultaneously. We extend a model for simulating thunderstorm downburst events and their effects on a single turbine unit to situations where multiple ...
Hieu Huy Nguyen, Lance Manuel
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Forecasting of Tornadoes and Downbursts

2020
Abstract Tornadoes and downbursts cause extreme wind speeds that often present a threat to human safety, structures, and the environment. While the accuracy of weather forecasts has increased manifold over the past several decades, the current numerical weather prediction models are still not capable of explicitly resolving tornadoes and
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Numerical Simulation of Downburst Wind Loads

2009 International Conference on Management and Service Science, 2009
Wind hazard is the one which has the widespread influence in the nature disaster. Transmission towers have experienced a number of failures due to downburst wind events in recent years, with devastating economical and social consequences. Based on the mechanism of downburst wind load, the present paper proposes an AR model method of adding turbulence ...
Jinwen Wang, Wei-lian Qu
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Pressure distributions on a cube in a simulated thunderstorm downburst—Part A: stationary downburst observations

Journal of Wind Engineering and Industrial Aerodynamics, 2002
Abstract Thunderstorms are responsible for a large amount of wind-induced damage around the world. It is known that the wind characteristics in thunderstorms, particularly downbursts, differ significantly from those of synoptic scale boundary layer winds. This paper describes a study aimed at simulating the flow structure in a downburst and obtaining
M.T Chay, C.W Letchford
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Investigation of various airplanes under downburst

21st Atmospheric Flight Mechanics Conference, 1996
A numerical scheme is applied to determine the influence of a downburst on the response and stability of several types of aircraft during powered approach. The downburst is modeled using 2D bell-type curves. All responses are analyzed for each type of aircraft.
M. Ghazi, K. Juhany
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The DOWNBURST MXO: a real-time downburst monitoring service in eastern Spain

In the framework of the DOWNBURST project, here we present the first real-time downburst monitoring service in eastern Spain. Downbursts are strong winds that descend from a thunderstorm and spread out quickly once they hit the ground. These extreme winds are one of the most damaging natural events and can reach the force and produce damages similar to
Cesar Azorin-Molina, Francisco Granell, Jose Gomez-Reyes, Carlos Calvo-Sancho, Andrés Barrio-Martín, Nuria P. Plaza-Martín, Andreas F. Prein, Sergio M. Vicente-Serrano, Luis Gimeno, Raquel Nieto, Deliang Chen, Tim R. McVicar, Zhenzhong Zeng, Amir Pirooz, Marcos Martínez-Roig, Juan Jesús González-Alemán, María Luisa Martín   +16 more
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Control of an aircraft in downbursts

Journal of Guidance, Control, and Dynamics, 1990
Guidance schemes are designed to approximate the optimal survival and optimal performance paths through downbursts, which were determined in the previous paper. Specifically, climb-rate command following is used to achieve performance, and altitude command following is used to enhance survivability.
Yiyuan Zhao, A. E. Bryson
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DOWNBURSTS: Meteorological features and wind field characteristics

Journal of Wind Engineering and Industrial Aerodynamics, 1990
Abstract Since the term “downburst” was coined by the author back in 1976, it has been subclassified into “microburst” and “macroburst” according to the horizontal dimension of the wind system. Introduced in this paper is the basic observational evidence of the microburst investigated by three fact-finding projects in 1978, 1982, and 1986, at three ...
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