基于功率譜的風電葉片的損傷識別研究
[Abstract]:With the increasing demand of energy and environment and the increasing pressure of environmental protection, countries all over the world have strengthened the development and development of new energy. As a clean and green energy, wind energy plays an important role in energy saving and air pollution prevention. Wind turbine is a commonly used device to capture wind energy. In the process of wind energy capture, wind turbine blade is also the key part of wind power plant. When wind turbine blade is damaged during operation, The structural characteristics of the whole wind power plant will decline, especially when the wind turbine blade collapses, it will cause serious economic losses and even cause safety risks. The research of wind turbine blade damage identification under environmental excitation is of great significance to domestic and foreign researchers. Based on the modal data (frequency and mode shape) and the power spectrum of pulsating wind acceleration response, the damage identification of wind turbine blades before and after damage is studied by combining the experimental method and numerical simulation. According to Davenport wind speed spectrum theory and Davenport theory, the power spectral density of Davenport wind speed is loaded on the wind turbine blade, and the acceleration response power spectrum of wind turbine blade before and after damage is obtained. In this paper, the wind turbine blades before and after the damage are numerically simulated and the structural dynamic tests are carried out. According to the ratio of the maximum power spectrum of acceleration response before and after the damage, the damage properties of the wind turbine blades are accurately determined and the damage location is located. According to the typical example of wind turbine blade crack damage, this paper proposes a method to evaluate the overall damage degree of wind turbine blade, which is called acceleration response power spectrum sensitivity matrix method. By evaluating the whole damage degree of wind turbine blade in different damage types and different damage degree, the damage qualitative, location and quantitative analysis of wind turbine blade were carried out accurately by using the structural response power spectrum sensitivity matrix.
【學位授予單位】:河北大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM315
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