Influence of Environment Loading Factors on System Design

Paddy Conroy, Jacek Stecki, and Andrew Thorn
Submission Type: 
Full Paper
phmec_16_025.pdf446.8 KBJune 7, 2016 - 8:26pm

A closed-loop, iterative FMEA process is vital for a safe design, but the challenge is in performing the FMEA in such a way that alternate scenarios can be rapidly considered, and changes implemented to improve the design. This paper identifies an explicit model-based method to optimise system design by linking the failure identification process to specific operating scenarios and environmental conditions [Environment Loading Factors (ELF)]. Current methods exist to define FMEA and operating scenarios, but are limited by the lack of connectivity and traceability between the two. Without connectivity the FMEA is limited in scope, and emergent scenarios cannot be easily understood without repeating the entire analysis process. This paper outlines a model-based method to define operating scenarios, each with a user defined Operating Environment (OE). The OE is defined by a set of Environmental Factors (based on a taxonomy), each with a unique set of Environmental Characteristics. The OE is then used to modify the expected criticality of associated failure modes for the system. By linking failure modes to an operating scenario, changes can be made to the operating scenarios to automatically update and advise failure mode changes to the design FMEA. The linkage can be used to explore a wider variety of operating conditions and use-cases, including the ability to perform trade studies to compare different environments and examine their impact on the design. By comparing and assessing operating environments concurrently in the design process, a safer and more robust design can be realised.

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Submission Keywords: 
model-based FMEA
environmental stresses (ESs)
mission planning
failure modes effects and criticality analysis (FMECA)
Submission Topic Areas: 
Modeling and simulation
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