| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a state monitoring method for a periodic moving body, capable of easily deciding a state of the periodic moving body. <P>SOLUTION: In this state monitoring method for the periodic moving body, a signal train comprising N signals showing displacement of vibration of the periodic moving body is acquired. When a large signal having an absolute value S times as large as the normal signal is included every m signals inside the signal train, a distance J between system parameters of the signal train (wherein, J is expression (1); parameters of an AR model in normal time are a<SP>0</SP><SB>1</SB>=0, and a<SP>0</SP><SB>2</SB>=-1, and parameters a<SP>1</SP><SB>1</SB>, a<SP>1</SP><SB>2</SB>of the AR model in abnormal time are represented by expression (2); andρ<SB>1</SB>andρ<SB>2</SB>are respectively primary and secondary delay autocorrelation coefficients) between system parameters of the signal train is found, and the state of the periodic moving body is monitored on the basis of a value of the found distance J. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
