摘要
针对风力机叶片结构的运行工况,应用有限元分析方法,对叶片进行动力学建模、动力学特性及应变响应的分形特征研究。计算分析1MW风力机叶片的固有特性和应变响应,得到叶片的频率、振型和从额定工况到共振工况下的应变响应特征。并对叶片表面的动态应变响应进行广义分形特征研究,计算了其广义敏感维数和广义维数谱,用广义敏感维数对叶片表面的应变响应进行定量分析,找出叶片的应变响应分形特征。尝试用广义分形理论及敏感维数分析大型复合材料叶片的应变响应特征并用于损伤识别。
The large-scale glass fibre reinforced plastic blade is a key part for wind turbine generator system. In this paper, we studied its dynamies model, the dynamic characteristic and fraetal characteristic of the strain response of the blade with FEM. Through calculating the internal characteristies and strain response of 1 MW wind turbine blade, the natural frequencies, mode shapes, and strain response from rated to resonant operating conditions are caleulated, and the dynamic strain response characteristics of the blade are obtained. Then, the general fractal characteristic of the dynamic strain response of the blade surface is studied. General sensitivity dimension value and the spectrogram of the blade surface is calculated, respectively. In addition, the dynamic response of the blade surface is quantitatively analyzed by general sensitivity dimension, and the strain response fraetal eharaeteristic of the blade is obtained. The dynamic characteristic analysis and damage identification of glass reinforced plastic （GRP） blade is also analyzed by general fraetal theory and sensitivity dimension.
出处
《机械科学与技术》
CSCD
北大核心
2009年第1期108-110,116,共4页
Mechanical Science and Technology for Aerospace Engineering
基金
国家863计划项目(2006AA05z429)资助
关键词
风力机叶片
动力学建模
应变响应分形特征
损伤识别
wind turbine blade
dynamics model
strain response fractal characteristic
damage identification
