engleski

A Non-Destructive Wind Turbine Blade Analysis Based on the Thermal Stress Analysis

In presented paper experimental evaluation of the stress distribution based on the Thermal Stress Analysis has been performed on a wind turbine blade at the second modal vibration regime. Small wind turbine blade was exposed to a simple oscillating movement, similar to the real movement when the blade is mounted on a wind turbine rotor. Internal loads of the blade structure, caused by deflections during oscillated movement, provide energy dissipation in their internal material structure. Energy dissipation, due to the elastic stresses in the structure, can be detected with an infrared thermal imaging camera. The Finite Element modal frequency analysis of the 3D scanned model has been used to evaluate the global structural behaviour and approve Thermal Stress Analysis results. Structure of the blade was detected with ultrasonic probe. As a result, simple procedure for non-destructive structure analysis of the wind turbine blades is proposed.

thermal Stress Analysis; modal analysis; 3D scanning

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