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Article Excerpt
1. Introduction
As wind energy systems increase their penetration into the national electrical power base, long-term reliability of wind turbines becomes of even greater importance. New tools and methods are needed to perform real time and predictive condition monitoring on major wind turbine subsystems, including blades, gearboxes, towers, and generators. Moisture absorption, fatigue, wind gusts, and lightning strikes can be factors that damage wind turbine blades. Such stressors, as well as normal fatigue cycles and aerodynamic loads, cause fatigue damage. Moreover, these blades are massive structures with a 1.5-2.5 MW turbine weighing some 22,000 Lbs and blades 10" thick at base, usually made of fiberglass, vinyl esters and epoxies with low specific modulus and low natural frequencies. Under loading, the deflections and strains of the cantilevered blade can be quite large. While the design...
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