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Vol. 155, Issue 8, August 2013, pp. 255-261




Research in the Operational Modal Analysis of Rotating Machinery Reducer
1 Niu Xue-Mei, 1 Meng Wen-Jun, 2 Cheng Hang

1 Taiyuan University of Science and Technology, Taiyuan, 030024, China

2 Institute of Mechatronics Engineering, Taiyuan University of Technology, Taiyuan 030024, China
E-mail: c85h@sohu.com, nxmlpc@126.com, ynwang56@yahoo.com.cn


Received: 16 May 2013   /Accepted: 12 August 2013   /Published: 20 August 2013

Digital Sensors and Sensor Sysstems


Abstract: In operational modal analysis process of the rotating machinery, it is always difficult to adopt usual modal analysis methods in parameter correction because of the modal parameter identification problems caused by harmonic modes. A technique to distinguish harmonic and structural modes is proposed here, that is, through frequency domain decomposition (FDD) of the vibration signals power spectral density matrix and probability density function, the two components (structural modes and harmonic modes) are successfully separated from the overall responses. The experiment indicates that structural modal parameters of the reducer can be obtained in real environment, which provides accurate references to the continuous mining machine reducer parameter correction. The method provides an efficient path for the modal analysis of rotating machinery.


Keywords: The continuous mining machine reducer, Operational mode, Frequency domain decomposition, Modal parameter identification, Probability density function.


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