Date of Award

5-2021

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

Committee Member

Laine Mears

Committee Member

Cameron Turner

Committee Member

John Wagner

Abstract

Manufacturing unexpected downtime contributes a significant cost drain to manufacturers. To reduce unexpected downtime, manufacturers invest in diagnostic and prognostic systems for determining equipment health. These systems help maintenance staff by providing predictions of equipment degradation over time. Based on these predictions, maintenance staff schedule repairs to prevent equipment failure from occurring during production. However, challenges still exist preventing the widespread implementation of these systems in the production environment. The amount and quality of data for training machine learning algorithms to predict these failures are two of these challenges. Existing methods of run-to-failure testing take too long to acquire the data necessary to represent manufacturing component failure. While methods exist to implement diagnostic and prognostic systems in manufacturing, there is no standard or methodology for generating data to train these systems. To address this challenge, a method, termed the Purposeful Failure Methodology (PFailM), is proposed to generate failure data in manufacturing equipment. A literature review was conducted around manufacturing equipment health to help formulate this methodology. Using previous papers, specific elements were identified from condition-based maintenance, prognostics and health management, failure methodologies, and design methodologies to create PFailM. These elements were formulated into a generalized methodology to allow for more widespread application to different manufacturing equipment types. Two different test cases are used to validate and test the PFailM approach. The first case was bearings. Two different damage protocols were created for bearings using PFailM. The first damage protocol involved the generation of damage to simulate spalling on the bearing races. The second damage protocol was to simulate contamination via lubrication injection on the bearing races and rolling elements. The second test case used a UR10 robot. The damage protocol simulated the overloading of the robot end-effector. Data were generated from the bearing spalling damage protocol and the overloading damage protocol for the robot. Data observations and methodology refinement were conducted to continue the standardization of steps for the methodology.

Available for download on Wednesday, June 15, 2022

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