Predictions of Low-Frequency and Impulsive Sound Radiation From Horizontal-Axis Wind Turbines

1982 ◽  
Vol 104 (2) ◽  
pp. 124-130 ◽  
Author(s):  
R. Martinez ◽  
S. E. Widnall ◽  
W. L. Harris
Keyword(s):  
Wind Turbines ◽  
Low Frequency ◽  
Theoretical Models ◽  
Horizontal Axis ◽  
Time Signals ◽  
Horizontal Axis Wind Turbines ◽  
Acoustic Output ◽  
Blade Loads ◽  
Large Wind ◽  
Good Agreement

This paper develops theoretical models to predict the radiation of low-frequency and impulsive sound from horizontal-axis wind turbines due to three sources: (i) steady blade loads, (ii) unsteady blade loads due to operation in a ground shear, (iii) unsteady loads felt by the blades as they cross the tower wake. These models are then used to predict the acoustic output of MOD-I, the large wind turbine operated near Boone, N. C. Predicted acoustic time signals are compared to those actually measured near MOD-I; good agreement is obtained.

A Procedure for the Development of Control-Oriented Linear Models for Horizontal-Axis Large Wind Turbines

2006 ◽  
Vol 129 (4) ◽  
pp. 469-479 ◽  
Author(s):  
Shashikanth Suryanarayanan ◽  
Amit Dixit
Keyword(s):  
Wind Turbines ◽  
Linear Models ◽  
Horizontal Axis ◽  
Modeling Procedure ◽  
Aerodynamic Interaction ◽  
Horizontal Axis Wind Turbines ◽  
Stiffness Characteristics ◽  
Mechanical Elements ◽  
Large Wind ◽  
Bem Theory

In this work we describe a methodology to construct control-oriented, multi-input, multi-output linear models representing the dynamics of variable-speed, pitch-controlled horizontal-axis wind turbines (HAWT). The turbine is treated as an interconnection of mechanical elements with distributed mass, damping, and stiffness characteristics. The behavior of the structural components of the turbine is approximated as that of their dominant modes and the wind-blade aerodynamic interaction is modeled using the Blade Element Momentum (BEM) theory. The modeling procedure explicitly exploits the horizontal-axis configuration and constraints imposed thereof. The models developed using the outlined procedure are parametrized based on a handful of parameters that are often used to specify mass/stiffness distributions and geometry. The predictions of the linear models so constructed are validated against that of an established nonlinear model. The use of the modeling procedure in addressing problems of immediate interest to the wind turbine industry is presented.

scholarly journals Benefits of collocating vertical-axis and horizontal-axis wind turbines in large wind farms

Wind Energy ◽  
2016 ◽  
Vol 20 (1) ◽  
pp. 45-62 ◽  
Author(s):  
Shengbai Xie ◽  
Cristina L. Archer ◽  
Niranjan Ghaisas ◽  
Charles Meneveau
Keyword(s):  
Wind Turbines ◽  
Wind Farms ◽  
Vertical Axis ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbines ◽  
Large Wind

A torque matched aerodynamic performance analysis method for the horizontal axis wind turbines

Wind Energy ◽  
2013 ◽  
Vol 17 (11) ◽  
pp. 1727-1736 ◽  
Author(s):  
Ali Al-Abadi ◽  
Özgür Ertunç ◽  
Horst Weber ◽  
Antonio Delgado
Keyword(s):  
Performance Analysis ◽  
Wind Turbines ◽  
Aerodynamic Performance ◽  
Horizontal Axis ◽  
Analysis Method ◽  
Horizontal Axis Wind Turbines
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