Xu Yonggang,He Zhengjia
(School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:Two-dimensional approximate entropy(A-E2d) was proposed to measure the axis orbit complexity and quantitatively estimate the running conditions of rotating machinery. As a new dimensionless factor, only short time-series are needed to calculate the A-E2d of random signal or certain signal with high anti-interference ability. Successful application of analysis axis orbit complexity was achieved in bearing bushing of a mechanical set. The results show that A-E2d have excellent ability to quantify the time pattern complexity of the axis orbit,thereby providing an effective technology for condition monitoring and fault diagnosis of mechanical equipment.
Keywords:two-dimensional approximate entropy;complexity;axis orbit;fault diagnosis
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