针对基于结构振型参数的损伤定位方法抗噪性差、对微小损伤不敏感以及对多损伤识别性能低等问题,基于振型低秩性与损伤分布稀疏性提出了一种复合材料层合板多损伤识别方法。首先,使用高斯-拉普拉斯算子(Laplacian of Gaussian,简称LoG)...针对基于结构振型参数的损伤定位方法抗噪性差、对微小损伤不敏感以及对多损伤识别性能低等问题,基于振型低秩性与损伤分布稀疏性提出了一种复合材料层合板多损伤识别方法。首先,使用高斯-拉普拉斯算子(Laplacian of Gaussian,简称LoG)求解曲率模态;其次,利用鲁棒主成分分析提取曲率模态中损伤诱导产生的奇异值进行损伤定位;然后,提出了一个鲁棒损伤定位指标用于融合多个曲率模态的损伤信息;最后,使用带损伤复合材料层合板数值模拟与实验数据验证了方法的有效性。结果表明,该方法无需无损结构参考信息,便可准确地定位复合材料层合板中多个小面积损伤。展开更多
Libraries in China's higher education institutions have been developing in keeping pace with the flourishing development of China's higher education. This article aims to make an introduction to the constructi...Libraries in China's higher education institutions have been developing in keeping pace with the flourishing development of China's higher education. This article aims to make an introduction to the construction of China's higher education libraries, especially the recent three decades' achievements since China's reform and opening-up in 1978. In this article, the authors draw a general picture of the development of libraries in China's higher education institutions, covering such eight aspects as management, types and positioning,organizational structure and personnel, expenditure and buildings, reader service, building and sharing of resources as well as automation system.展开更多
文摘针对基于结构振型参数的损伤定位方法抗噪性差、对微小损伤不敏感以及对多损伤识别性能低等问题,基于振型低秩性与损伤分布稀疏性提出了一种复合材料层合板多损伤识别方法。首先,使用高斯-拉普拉斯算子(Laplacian of Gaussian,简称LoG)求解曲率模态;其次,利用鲁棒主成分分析提取曲率模态中损伤诱导产生的奇异值进行损伤定位;然后,提出了一个鲁棒损伤定位指标用于融合多个曲率模态的损伤信息;最后,使用带损伤复合材料层合板数值模拟与实验数据验证了方法的有效性。结果表明,该方法无需无损结构参考信息,便可准确地定位复合材料层合板中多个小面积损伤。
基金supported by the National Planning Office of Philosophy and Social Science(Grant No.04BTQ002)
文摘Libraries in China's higher education institutions have been developing in keeping pace with the flourishing development of China's higher education. This article aims to make an introduction to the construction of China's higher education libraries, especially the recent three decades' achievements since China's reform and opening-up in 1978. In this article, the authors draw a general picture of the development of libraries in China's higher education institutions, covering such eight aspects as management, types and positioning,organizational structure and personnel, expenditure and buildings, reader service, building and sharing of resources as well as automation system.