The Method for Determining Optimal Analysis Length of Vibration Data Based on Improved Multiscale Permutation Entropy

Table 1

Test conditions of pipeline prototype.

Case	Description of working conditions	Sampling time (s)	Sampling frequency (Hz)
A	Full shutdown (working condition 1)	100	512
B	2# pump opening moment	50	512
C	2# pump stable operation	100	512
D	2# pump stable operation, 3# pump opening moment	50	512
E	2#, 3# pump stable operation	100	512
F	2#, 3# pump stable operation, 1# pump opening moment	50	512
G	1#, 2#, 3# pump stable operation	100	512
H	3# pump stable operation, 1#, 2# pump closes at the same time	50	512
I	3# pump stable operation	100	512
J	3# pump closing moment	50	512
K	Full shutdown (working condition 6)	100	512