风力发电机叶片设计及启动分析（英文版）13.pdf

文档介绍：Journal of Wind Engineering
and Industrial Aerodynamics 85 (2000) 309}324
Structural health monitoring techniques
for wind turbine blades
Anindya Ghoshal!, Mannur J. Sundaresan!, Mark J. Schulz!*,
P. Frank Pai"
!Structural Dynamics and Control Laboratory, Department of Mechanical Engineering, North Carolina A&T
State University, Greensboro, NC 27411, USA
"Department of Mechanical and Aerospace Engineering, Structural Mechanics and Control Laboratory,
University of Missouri * Columbia, Columbia, MO 65211, USA
Abstract
Wind turbine blades are made of "berglass material to be cost e!ective, but they can be
damaged by moisture absorption, fatigue, wind gusts or lightening strikes. It is important to
detect the damage before the blade fails catastrophically which could destroy the entire wind
turbine. In this paper, four di!erent algorithms are tested for detecting damage on wind turbine
blades. These are the transmittance function, parison, operational de#ection
shape, and wave propagation methods. The methods are all based on measuring the vibration
response of the blade when it is excited using piezoceramic actuator patches bonded to the
blade. The vibration response of the blade is measured using either piezoceramic sensor patches
bonded to the blade, or a scanning laser doppler vibrometer. The sensitivity of the techniques to
detect a reversible damage simulated by a steel plate clamped to a section of a wind turbine
blade pared in this paper. ( 2000 Elsevier Science Ltd. All rights reserved.
Keywords: Structural health; Monitoring techniques; Wind turbine; Blade
1. Introduction
Wind turbine blades can e damaged by moisture absorption, fatigue, wind
gusts or lightening strikes. In wind farms, aerodynamic interaction between di!erent
turbines can cause unpredictable and excessive loads on the blades. These loads
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