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基于模态分析的隔热瓦损伤检测方法

发表时间:2014-08-15  浏览量:1692  下载量:647
全部作者: 夏巍,赵东伟,张正直
作者单位: 西安交通大学航天航空学院,机械结构强度与振动国家重点实验室
摘 要: 隔热瓦是高速飞行器热防护系统(thermal protection system,TPS)的重要外层结构,易遭受超高速冲击损伤。研究针对典型TPS的结构形式,开展陶瓷隔热瓦的自振模态有限元分析,将基于结构振动的无损检测方法应用于陶瓷隔热瓦。通过分析振动固有频率和模态振型的损伤敏感度,指出固有频率参数对隔热瓦损伤不敏感,而基于模态振型的模态置信度(modal assurance criteria, MAC)值和坐标模态置信度(coordinate modal assurance criteria, COMAC)值可用于检测隔热瓦的损伤程度和损伤位置。
关 键 词: 振动与波;损伤检测;陶瓷隔热瓦;振动模态
Title: Damage detection in thermal protection tiles based on modal analysis
Author: XIA Wei, ZHAO Dongwei, ZHANG Zhengzhi
Organization: State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University
Abstract: Tiles are important outer structures in thermal protection system (TPS) of high-speed vehicles. They are usually damaged when subject to hypervelocity particle impacts. In this paper, a typical structural configuration of TPS is considered. The free vibration mode of ceramic tiles is analyzed based on finite element model, and the vibration based damage detection method is applied in ceramic tiles. With a thorough analysis for damage sensitivity of vibration natural frequency and mode shape, the conclusions are reached that the natural frequency is insensitive to tile damage, while modal assurance criteria (MAC) and coordinate modal assurance criteria (COMAC) values based on mode shapes are sensitive and can be used to detect tile damage level and location, respectively.
Key words: vibration and wave; damage detection; ceramic tiles; vibration mode
发表期数: 2014年8月第15期
引用格式: 夏巍,赵东伟,张正直. 基于模态分析的隔热瓦损伤检测方法[J]. 中国科技论文在线精品论文,2014,7(15):1525-1530.
 
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