Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 2000"

TL;DR: In this article, three methods for calculating the parameters of the Weibull wind speed distribution for wind energy analysis are presented: the maximum likelihood method, the proposed modified maximum likelihood (MML) method, and the commonly used graphical method.

TL;DR: In this paper, a nonlinear and adaptive control algorithm for wind turbines is proposed to adjust the excitation winding voltage of the generator to achieve smooth and asymptotic rotor speed tracking.

TL;DR: In this article, four different algorithms are tested for detecting damage on wind turbine blades, including transmittance function, resonant comparison, operational deflection shape, and wave propagation methods based on measuring the vibration response of the blade when it is excited using piezoceramic actuator patches bonded to the blade.

TL;DR: In this article, the results of on-site monitoring of the oscillations and wind speed measurements at the nearby island of Sprogo correlated well with wind-tunnel test results obtained during design, indicating that the observed oscillations were due to periodic von Karman type vortex shedding in the wake of the girder.

TL;DR: In this paper, the free end effect on the near wake of a finite circular cylinder in a cross flow has been investigated experimentally, and three finite cylinders with aspect ratios (L / D ) of 6, 10 and 13 were tested in a subsonic wind tunnel at a Reynolds number of 20,000.

TL;DR: In this article, an experimental investigation into the properties of the vortex wake behind a wind turbine rotor has been carried out at model scale, using Particle Image Velocimetry (PIV), the two-blade model was operated at tip speed ratios in the range λ=3-8, and chord Reynolds numbers Re=6400-16

TL;DR: In this article, an identification method has been developed to extract all the flutter derivatives defined by R.H. Scanlan, which is then used in the identification of flutter derivative of the Jiangyin suspension bridge over Yangtze River.

TL;DR: A brief history of bridge flutter analysis is presented in this article, followed by an examination of a multi-mode procedure and a more comprehensive full-mode approach in aerodynamic flutter analyses of long-span cable-supported bridges.

TL;DR: In this article, wind flow over hilly terrain is simulated by solutions of the Reynolds-averaged Navier-Stokes equations without the hydrostatic approximation, using finite-volume discretization and boundary-fitted coordinates to resolve the terrain.

TL;DR: In this article, a new approach to hurricane wind damage prediction using the concept of wind damage bands is proposed, which employs an objective weighting technique driven by building component cost factors, component fragilities, and location parameters to obtain upper and lower bounds to building damage thresholds.

TL;DR: In this article, the authors present the conceptual design of passive and active control devices to attenuate the observed oscillation amplitudes of the steel twin-box-girder Rio-Niteroi bridge.

TL;DR: In this paper, a flow visualization study of conical vortex behavior was performed in the wind tunnels of Colorado State University (CSU) and at full scale at Texas Tech University (TTU).

TL;DR: In this article, the authors describe a wind-tunnel study of the wake dynamics of an operational, horizontal-axis wind turbine, where the behaviour of the vorticity trailing from the turbine blade tips and the effect of interference on wake development were considered.

TL;DR: In this article, the impact of complex terrain wind conditions on the loading of wind turbines is examined using state-of-the-art computational means, and the analysis is two folded.

TL;DR: Based on the knowledge developed in structural reliability theories, this paper presented a reliability analysis model, which is formulated as a limit state up-crossing problem, and a probability calculation approach to determine the probability of bridge failure due to flutter.

TL;DR: In this paper, the results of an experimental, theoretical and computational investigation of wind-driven ventilation through a 6-m cube with openings on opposite faces were presented, and measurements were made of the surface pressures coefficients and mean and total ventilation rates through the cube for the faces with the openings both normal and parallel to the wind.

TL;DR: In this article, a comparison between wind-tunnel tests and CFD modelling for flow downstream of a two-dimensional porous fence in a thick boundary layer is presented, and three porosities are considered, 0, 23% and 50%, and two turbulence models are tested, modified k-e and full Reynolds stress.

TL;DR: The numerical model MIMO as discussed by the authors is a three-dimensional model for simulating microscale wind flow and dispersion of pollutants in built-up areas, which solves the Reynolds averaged conservation equations for mass, momentum and energy.

TL;DR: In this article, a fully coupled buffeting analysis of the Tsing Ma suspension bridge in Hong Kong is carried out, which is a combination of finite element approach and pseudo-excitation method in the frequency domain.

TL;DR: In this article, a series of wind tunnel studies and analytical studies were conducted, and it was found that a slot at the center of a girder was effective to improve the aerodynamic stability.

TL;DR: In this paper, the spatial correlation of the natural wind was measured on two Honshu-Shikoku Bridges and a gust response analysis was conducted to evaluate the effect of the difference of the spatial correlations of the wind on gust responses, in order to ease the design specifications of long span bridge concerning gust response.

TL;DR: In this paper, the potential for active attenuation of structural dynamic load oscillations, by means of continuous control of the yaw servo, is investigated, where the mathematical models are obtained from the equations of motion corresponding to a system of flexibly interconnected rigid bodies.

TL;DR: In this article, a model for the measuring process of ultrasonic anemometers (ultrasound pulse based) is presented, where the differential equations that describe the travel of ultrasound pulses are solved in the general case of non-steady, non-uniform atmospheric flow field.

TL;DR: In this article, a variable-speed, fixed-pitch wind turbine control strategy was investigated to evaluate the feasibility of constraining rotor speed and power output without the benefit of active aerodynamic control devices.

TL;DR: In this article, an empirical algorithm is presented which allows the performance of the TMD to be optimised, based on the measured response, which relies on two assumptions: the smoothness of the spectrum of excitation and the availability of an estimate of the dynamic properties of the main structure.

TL;DR: In this article, a free vortex lattice model is used to stimulate the flow field of a rotor at either a steady yaw angle to the wind or undergoing a changing YAW angle, for which cases the aerodynamic forces on the rotor are unsteady.

TL;DR: In the design of actively controlled structures subjected to strong wind excitation, the problem of considering the number of actuators, the position of actuator and the control algorithm simultaneously is of a multi-level design optimization with the properties of non-linearity, discreteness and so on.

TL;DR: In this article, a hot wire anemometry system was implemented for the measurements of mean velocity and velocity fluctuations Data acquisition was performed by means of an A/D converter board connected to a personal computer.

TL;DR: The guidelines for estimating wind speed variations in boundary layer flow over hills and other terrain features as well as within internal boundary layers downstream of changes in surface roughness were developed by Taylor and Lee and Walmsley, Taylor and Salmon as mentioned in this paper.

TL;DR: In this paper, a model of the spectral velocity-tensor in neutral flow over complex terrain (orography and variable roughness) is developed to estimate the influence of hills and roughness changes on spectra, cross-spectra and coherences of relevance for wind engineering.