Quality & Reliability Engineering

Person checking manufactured items for quality assurance

Quality and reliability engineering seeks to ensure acceptable outcomes and reduce process failure in manufacturing and other systems.

Faculty

Kangwon Seo

  • Analysis of Correlated Life Tests Data
  • Anomaly Prognosis Model in Manufacturing System

Projects

Slide 27

Analysis of Correlated Life Tests Data

Research Motivation

  • The complete randomization in product’s life tests is hardly achieved due to the limited availability of test equipment and test units, as well as budget and time constraints.
  • Typical experimental protocols used in accelerated life tests (subsampling and random blocks) should be taken into account in reliability data analysis.

Experimental Results

  • A simulation study showed that ignoring the group-to-group variation can cause serious problems for the parameter estimation of the acceleration model, which in turn may lead to an even more erroneous conclusion for a product’s lifetime when it is extrapolated to the usual stress condition.
  • The proposed method was applied to the SSALT data of power cable insulation as a function of a time-varying stress of a voltage. The result shows substantial amount of group effects.

Anomaly Prognosis Model in Manufacturing System

Research Motivation

  • Multiple sensor data collected from a paper mfg. machine provides useful information on the system’s health condition.
  • Set a goal of detecting system failure beforehand to prevent unexpected breakdown of the system.
  • The dataset is highly imbalanced, multivariate, and high-resolution streaming data.

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