Research on RUL prediction and variable sample rate DMC-PID life extension method for 3D stage wire system
MAO Hai-jie
ZHANG Xiao-rui
FENG Xiao-lin
JIANG Dong-nian
Abstract：Aiming at the safety problems caused by servomotor degradation in 3D stage wire system,considering the ex-isting degradation models with low accuracy,conservative definition of traditional life and low efficiency of life extension,this paper proposes a system-level remaining useful life prediction method based on the composite multi-stage degradation modeling,and carries out the research of adaptive variable sampling rate autonomous maintenance strategy based on the prediction results.Firstly,starting from practical engineering considerations,a three-level autonomous maintenance frame-work is constructed,which includes the basic control layer,the health assessment layer and the autonomous maintenance layer;secondly,considering the variability of the degradation stages and the influence of random shocks,a composite multi-stage degradation model of Wiener+Poisson is established,and an expectation-maximization parameter estimation algorithm is adopted,which integrates the parameter estimation process with the cumulative sum and change-point detec-tion algorithms,and adopts a more appropriate evaluation of the last exit time definition of the control system life is used to obtain the analytical solution of the remaining useful life of the system under the composite multi-stage degradation model;Finally,based on the prediction results,a DMC-PID life extension control strategy based on adaptive variable sampling rate is proposed to improve the maintenance efficiency and effectiveness.Simulation experiments verify the effectiveness of the proposed method.
Keywords：3D stage wire systemremaining useful life predictioncompound multi-stage degradationlast exit timeautonomous maintenanceDMC-PID life extension control
Publication Date：2025-12-30
Online Publishing Date：2026-03-05(First online date of this platform, not the publication date of the document)
Pages：12( 2545-2556 )