基于光纤光栅的悬臂梁动力学参数测量  

Dynamic parameters measurement of cantilever beam using fiber Bragg grating

作　　者：余有龙[1] 段营营[1] 孙诗惠 刘春晓[1] 耿淑伟[1] 姜生元[2] 邓宗全[2] 余笛林 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,合肥230009 [2]哈尔滨工业大学机电工程学院,哈尔滨150001 [3]中国移动通信集团安徽有限公司六安分公司,六安237000

出　　处：《黑龙江大学自然科学学报》2015年第1期115-118,共4页Journal of Natural Science of Heilongjiang University

基　　金：登月三期预研项目资助项目(TY3Q-20110005);合肥工业大学博士专项科研基金资助(GDBJ2009-010)

摘　　要：介绍一种利用光纤光栅测量悬臂梁动力学参数的新方法。对于矩形等截面悬臂梁,分析了传感光栅的波长变化与梁挠度以及自由端所受外力间的关系。实验证实观测光栅波长漂移量的时间变化规律可捕获梁振动的频率和振幅信息,前者为23.70 Hz,后者在自由端为6.38 mm。经频谱分析,获得梁的一阶、二阶以及三阶固有频率分别为23.54、47.08和70.63 Hz,前者与理论值23.42 Hz相对误差为0.5%。A new method of using fiber Bragg grating to measure dynamic parameters ot canmever beam is proposed. To a rectangular cross-section beam, relationships between the changes of Bragg wavelength and the deflection and the applied force at free end are analyzed theoretically. Vibration frequency and amplitude at the free end are obtained to be 23.70 Hz and 6. 38 mm, respectively, by observing the time relation of the wavelength-shift of the grating. By frequency spectral analysis, the first, the second and the third natural frequencies of the beam are shown to be 23.54, 47.08 and 70. 63 Hz, respectively. Comparing with the theoretical value 23.42 Hz, the relative error of the first natural frequency is 0.5%.

关 键 词：光纤光栅 动力学参数 悬臂梁 波长漂移 固有频率 

分 类 号：O43[机械工程—光学工程]