An Improved Recursive ARIMA Method with Recurrent Process for Remaining Useful Life Estimation of Bearings

Algorithm 1

ARIMA-R.

	Input:
(1)
(2)	repeat
(3)
(4)
(5)	Calculate ACF of y
(6)
(7)	until eps and ACF converge \(⊳\) the limit eps depends on practical situation.
(8)	First guess:
(9)	for training and testing set do
(10)	Calculate by \(⊳\) other prediction methods also work.
(11)	: end for
(12)	: k = 1
(13)	repeat
(14)	for training and testing set do
(15)	Calculate RMA
(16)
(17)	Construct feature
(18)
(19)	end for
(20)	Train the Rotation Forest in training set
(21)	for training set do
(22)
(23)	end for
(24)	Calculate
(25)	for training and testing set do
(26)
(27)	end for
(28)	Calculate changes
(29)
(30)	until or
(31)	Construct F<k>
(32)	forj from 1 to k do
(33)	Calculate
(34)	end for
(35)
	Output: estimated output