SYSTEM HEALTH MANAGEMENT (GA)

SHE Level 4
SCQF Credit Points 20.00
ECTS Credit Points 10.00
Module Code MHW226259
Module Leader Ioan-Octavian Niculita
School School of Computing, Engineering and Built Environment
Subject Instrumentation, Control & Analytical Sciences
Trimester
  • B (January start)

Summary of Content

Knowing when systems need to be maintained is of great importance to companies operating high-value assets. Further, to know ahead of time, with plenty of time to optimize the maintenance and cause the least amount of disruption to the operation, would be highly desirable. This is the goal of system health management. Physical systems/components' degradation phenomenon can be captured in functional models which can be then used to support the design of the system's health management capability. The equipment health management capability focuses on predicting the future performance of a system, specifically the time at which the system no long performs its desired functionality or its time to failure. This challenge becomes even greater for assets with long lifecycles and sometimes-inaccessible nature as this can easily complicate the ability to understand the likely timing of deteriorations or of critical asset failures. The module will introduce and exploit concepts related to characterisation and identification of technical risk associated with a high-value high complex system and it will introduce the candidates to the theory behind the system health management (SHM) topic. The SHM topic is based on some fundamental observations: all electromechanical components wear out as a function of time, use and environment conditions, and a complex system contains inherent design flaws that often reveal themselves only in operation under certain conditions. Over time, component degradation might result in performance degradation, subsystem faults, or system failure. When designing safety critical systems, engineers aims to prevent failures or at least to understand and to control their impact on the system in order to minimize the downtime. Very often, these systems have stringent reliability requirements which are typically met using a combination of reliability engineering and risk management techniques: -360 - Designing out the identified failure modes - Fault accommodation and fault propagation - Functional Failure Modes, Effects and Criticality Analysis (FFMECA) - Redundant components and subsystems - Fault detection, isolation and recovery (FDIR) - Identification and optimisation of instrumentation capable of supporting FDIR - Maintenance aware design - Risk priority assessment

Syllabus

Introduction to Conceptual System Design -360b7 Functional representation of a system b7 System dependencies Safety, Reliability and Maintainability Analysis -360b7 Safety Analysis (Functional Hazard Assessment, Fault Tree Analysis(FTA), Event Tree Analysis (ETA)) b7 Reliability Analysis (FMECA and System Reliability Predictions), Reliability Block Diagrams b7 Functional FMECA b7 Failure diagrams (causes-mechanism-faults-symptoms-functional failures) b7 Quantification of Criticality and Technical Risk (Occurrence, Severity, Detectability) b7 Risk Priority Number (RPN) calculations System Health Management Design -360b7 Faults vs Functional Failures b7 Diagnostic models Sensor set identification and optimisation -360b7 Fault detection b7 Fault isolation b7 Ambiguity groups b7 False alarms (False positives, false negatives). Data Analytics -360b7 Limits based monitoring b7 State base reasoning b7 Rule base reasoning b7 Pattern recognition Health Management Systems Engineering and Integration -360b7 Systems Engineering Concepts and Asset Lifecycles b7 Asset Requirements b7 System Health Management Requirements b7 Asset Design and Health Management Integration: Challenges and Opportunities b7 Brand New Design and Retrofits

Learning Outcomes

Upon successful completion of this module, students should be able to:1. Define and explain the functional breakdown of a complex system2. Identify the system's dependencies3. Describe the major roles of each individual component and why it was selected throughout the design process4. Understand ande characterize the failure modes of each individual component and their effects at the system level5. Carry out in systematic manner what if scenarios on top x most critical failure modes affecting the system under investigation in service6. Identify and optimize the instrumentation required to detect and isolate a given number of critical failure modes, challenges and opportunities7. Understand maintenance aware design approaches8. Understand the challenges and opportunities of integrating system health management capability into the system design process

Teaching / Learning Strategy

The module is tutorial-based with a significant element of self-study. Lectures will be used to introduce topics with worked examples and provide guidance on what to study. Deeper understanding will be attained through individual completion of modelling activities and work based case studies. Support will be provided in tutorial and laboratory sessions in which tutors will be available to clarify concepts and resolve difficulties. Specific laboratory sessions will be available to contextualize the theory and model a real example from the company where the candidate works.

Indicative Reading

System Health Management: With Aerospace Applications Editor(s): Stephen B. Johnson Thomas J. Gormley Seth S. Kessler Charles D. Mott Ann Patterson? Hine Karl M. Reichard Philip A. Scandura Jr. First published:31 May 2011 Print ISBN:9780470741337 |Online ISBN:9781119994053 |DOI:10.1002/9781119994053 Integrated Vehicle Health Management, Perspectives on an Emerging Field Editor: Ian K. Jennions SAE International First Published: 2011 Print ISBN-10: 0768064325 | Online ISBN-13: 978-0768064322 Integrated vehicle health management: business case theory and practice Editor: Ian K. Jennions SAE International First Published: 2012 Print ISBN-10: 0768076455 | Online ISBN-13: 978-0768076455

Transferrable Skills

Problem Solving and Numeracy Communication/Literacy/Linguistic/Critical Evaluation Independent working through design and investigation of specified case study. Oral dissemination of the results.

Module Structure

Activity Total Hours
Assessment (FT) 16.00
Lectures (FT) 24.00
Tutorials (FT) 12.00
Independent Learning (FT) 124.00
Practicals (FT) 24.00

Assessment Methods

Component Duration Weighting Threshold Description
Coursework 1 n/a 50.00 n/a Written report highlighting the design process for the SHM solution for a work based case study
Coursework 2 0.25 50.00 n/a Presentation covering the challenges and opportunities on the design of the SHM capability for a work based case study