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Research Papers

Online Degradation Assessment and Adaptive Fault Detection Using Modified Hidden Markov Model

[+] Author and Article Information
Seungchul Lee

Department of Mechanical Engineering, University of Michigan-Ann Arbor, 1210 H. H. Dow, 2300 Hayward Street, Ann Arbor, MI 48109-2136seunglee@umich.edu

Lin Li1

Department of Mechanical Engineering, University of Michigan-Ann Arbor, 1035 H. H. Dow, 2300 Hayward Street, Ann Arbor, MI 48109-2136lilz@umich.edu

Jun Ni

Department of Mechanical Engineering, University of Michigan-Ann Arbor, 1023 H. H. Dow, 2300 Hayward Street, Ann Arbor, MI 48109-2136junni@umich.edu

1

Corresponding author.

J. Manuf. Sci. Eng 132(2), 021010 (Apr 01, 2010) (11 pages) doi:10.1115/1.4001247 History: Received May 18, 2009; Revised February 08, 2010; Published April 01, 2010; Online April 01, 2010

Online condition monitoring and diagnosis systems play an important role in the modern manufacturing industry. This paper presents a novel method to diagnose the degradation processes of multiple failure modes using a modified hidden Markov model (MHMM) with variable state space. The proposed MHMM is combined with statistical process control to quickly detect the occurrence of an unknown fault. This method allows the state space of a hidden Markov model to be adjusted and updated with the identification of new states. Hence, the online degradation assessment and adaptive fault diagnosis can be simultaneously obtained. Experimental results in a turning process illustrate that the tool wear state can be successfully detected, and previously unknown tool wear processes can be identified at the early stages using the MHMM.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Basic form of a HMM

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Figure 2

Block diagram of the proposed modified HMM algorithm

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Figure 3

Markov chain with an unknown state S5

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Figure 4

Original observable signals and the HMM with the four known states

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Figure 5

HMM algorithm serving to estimate the states

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Figure 6

Posterior probability of P{q(n)=Si∣O(1),…,O(n)}

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Figure 7

Result of a wrong state estimation

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Figure 8

Posterior probability, but no wiggling is shown

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Figure 9

Test bed of the turning process with coolant supply (Ft: thrust force; Fc: cutting force)

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Figure 10

(a) Normal turning process with coolant and (b) different tool wear modes without coolant

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Figure 11

Estimated states: vertical dashed lines indicate the true states, while the solid lines represent the estimated states

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Figure 12

Control chart with conventional HMM

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Figure 13

Control chart with MHMM

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Figure 14

The estimated states via various algorithms: (a) HMM, (b) neural network, (c) GMM, and (d) K-means

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