摘要
Lamb波频散特性曲线是声发射技术定位轴承损伤源的重要参考依据,然而传统的解析法或数值法在分析轴承中导波传播特征时,无法获得完整的Lamb波频散特性曲线。针对这一问题,采用半解析有限元法求解轴承中Lamb波频散特性曲线。将该频散曲线与声发射信号时频图相对照,识别信号在轴承中的传播模态,并根据频散特性曲线中包含的频率信息分离不同频率的信号,使用小波系数模最大值法计算不同频率信号到达传感器的时间,结合传播速度与到达时间差计算损伤源与传感器之间的相对角度,从而定位轴承损伤源。此外,针对单传感器定位存在的位置不确定性问题,通过移动传感器进行二次定位,两次定位结果的重叠区域即为轴承损伤源的真实位置。通过断铅试验和模拟损伤源定位的测试,验证了所提方法的有效性。
Lamb wave dispersion characteristic curve is an important reference for acoustic emission technology to locate bearing damage sources.However,traditional analytical or numerical methods can’t obtain a complete Lamb wave dispersion characteristic curve when analyzing propagation features of guided waves in bearings.Here,aiming at this problem,a semi-analytical finite element method was used to solve Lamb wave dispersion characteristic curve in bearings.This dispersion curve was compared with time-frequency diagram of acoustic emission signal to identify propagation mode of signal in bearings,and separate signals with different frequencies according to frequency information contained in dispersion characteristic curve.The wavelet coefficient modulus maximum method was used to calculate the time for different frequency signals to arrive at sensor,combine propagation speed and arrival time difference for calculating the relative angle between damage source and sensor,and locate bearing damage source.In addition,aiming at the problem of position uncertainty in single sensor positioning,secondary positioning was performed by means of moving sensor,and the overlapping area of the two positioning results was true location of bearing damage source.The effectiveness of the proposed method was verified with lead breakage experiments and simulated damage source localization testings.
作者
魏涵
柳小勤
汤林江
陆平
伍星
WEI Han;LIU Xiaoqin;TANG Linjiang;LU Ping;WU Xing(College of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Advanced Equipment Intelligent Maintenance Engineering Research Center,Kunming 650500,China;Modern Intelligent Manufacturing Industry College,West Yunnan University of Applied Sciences,Dali 671000,China;College of Geomatics and Information Engineering,West Yunnan University of Applied Sciences,Dali 671000,China)
出处
《振动与冲击》
北大核心
2026年第3期210-218,共9页
Journal of Vibration and Shock
基金
国家自然科学基金(52265069)
云南省科技计划重点项目(202002AC080001)。
关键词
Lamb波频散特性曲线
声发射
半解析有限元法
连续小波变换
损伤源定位
Lamb wave dispersion characteristic curve
acoustic emission
semi-analytical finite element method
continuous wavelet transform
damage source localization
