采用基于传感器信息组合串扰消除法的工况传递路径分析  

Crosstalk elimination method in OTPA using sensors’combination

作　　者：伍先俊[1] WU Xianjun(Key Laboratory of Noise and Vibration,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院声学研究所噪声与振动重点实验室,北京100190

出　　处：《振动与冲击》2020年第17期10-15,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(11472289)。

摘　　要：传递路径分析法是一种分析噪声源贡献大小的有效方法,工况传递路径分析法不需要测量力,只需测量响应就可在机组运行状态下在线完成源贡献量测量与分析。但是串扰对测量精度影响很大,因此提出基于传感器信息组合串扰消除法的工况传递路径分析,在振源附近布置传感器,将测量得到的传感器信号进行频域组合;组合系数通过分步运转,测试振动噪声数据并建立方程,以其它振源振动引起某振源附近传感器的组合信号为0求解方程获得;将线性组合的传感器信号作为参考源信号参与工况传递路径分析,从而消除或减小串扰,准确获得各源的贡献。通过一个两声源的仿真和两个振源的平板试验,演示了分析方法,准确分析了各源贡献,表明采用传感器组合法消除串扰后可以提高激励源的辨识精度,并对传感器个数的影响进行了讨论。Transfer path analysis(TPA)is an effective method to analyze contributions of noise sources.A new TPA called the operational transfer path analysis(OTPA)does not need to measure force,but only needs to measure response for completing measurement and analysis of noise source contribution on-line under operational condition of a power unit.However,crosstalk has a great impact on response measurement accuracy.Here,a crosstalk elimination method in OTPA using sensors’combination was proposed.Sensors were arranged near vibration sources,and signals measured with sensors were combined in frequency domain to express the sensor signal near a certain source.Through step operation,vibration and noise data near each source were measured and used to establish equations.Combination coefficients were obtained by solving equations when the combined signal of the sensor near a certain source was zero and it was caused by other sources.Linear combination of sensor signals was taken as the reference source’s signal to join OTPA.Then crosstalk was eliminated or reduced to correctly obtain contributions of various sources.Simulation of two sound sources and a plate test of two vibration sources showed that the crosstalk elimination method using sensors’combination can improve identification accuracy of excitation sources.Finally,effects of sensor number were discussed.

关 键 词：传递路径分析(TPA) 串扰 贡献量 工况传递路径分析(OTPA) 

分 类 号：TB523[理学—物理]