【作者】 赵景超； 张元； 周标；

【Author】 Zhao Jingchao;Zhang Yuan;Zhou Biao;Nanjing University of Aeronautics and Astronautics, Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology;

【机构】 南京航空航天大学能源与动力学院航空发动机热环境与热结构工业和信息化部重点实验室；

【摘要】 整体叶盘由于制造容差,材料不均以及运行磨损等因素,叶盘各扇区性质会有微小差别,形成所谓的叶片失谐。叶片失谐可能在整体叶盘中引发显著的振动局部化现象,导致少数叶片振动幅值会过大诱发高周疲劳失效。由于一体化设计整体叶盘耦合模态密集分布和对叶片失谐高度敏感的特点,传统的整体叶盘模态测试方法难以准确获取单个叶片的模态振动信息。为此,本文提出一种新型整体叶盘模态测试方法,即采用人为添加的解谐质量彻底破坏整体叶盘结构的循环对称特性,以隔离每个所测叶片相邻扇区的耦合振动效应,在激振力作用下使其呈现"单扇区"的模态振动特性。该测试方案在本质上构成了一种新型整体叶盘失谐辨识方法,能够获取整体叶盘所有"单个"扇区频率失谐量的差异化分布,为整体叶盘的精准建模和模型修正奠定基础。更多还原

【Abstract】 Due to the manufacturing tolerance, material unevenness and operational wear and other factors,the blisk will have small differences in the nature of each sector of the blisk, forming the so-called blade mistuning. The blade mistuning may cause significant vibration localization in the blisk, resulting in high cycle fatigue failure induced by excessive vibration amplitude of a few blades. Due to the dense distribution of coupled modes and the high sensitivity to blade mistuning, the traditional modal test method of blisk is difficult to accurately obtain the modal vibration information of individual blades. To this end, this paper proposes a new modal test method for blisk, which uses artificially added detuning masses to completely destroy the cyclic symmetry of the blisk structure, in order to isolate the coupled vibration effects in the adjacent sectors of each blade under test and make it exhibit the modal vibration characteristics of a "single sector" under the action of the excitation force. The test scheme essentially constitutes a new type of blisk mistuning identification method, which can obtain the differential distribution of frequency mistuning of all "single" sectors of the blisk, laying the foundation for accurate modeling and model correction of the blisk.更多还原