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Principles of Engineering System Design

Explore the importance of requirements development in engineering system design through case studies like Air Bag System Failure in the 90s and Apollo 13 disaster analysis. Learn how to identify faults and create originating requirements effectively.

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Principles of Engineering System Design

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  1. Principles of Engineering System Design Dr T Asokan asok@iitm.ac.in

  2. Dr T Asokan asok@iitm.ac.in 044-2257 4707 Principles of Engineering System Design Originating Requirements Development: Examples T Asokan

  3. Air bags, safety device appearing in automobiles in the early 1990’s, became the cause of death for a noticeable number of individuals. There were severe flaws in the design, testing and deployment requirements envisaged.

  4. Case Study: REQUIREMENT ANALYSIS-Air Bag System Failure in the 90s- • The requirements defined only a single safety scenario on which to base the design • No requirement that the airbag remain undeployed during accidents at sufficiently slow speeds that no lives are in danger • Test condition requirements were wrongly identified. • Pre-impact braking was not taken into account • Injuries due to collision with the airbag was not considered • Requirements of disposal of unused or partially used bags were not identified

  5. Self Study • Analyse the causes of Apollo 13 disaster as an engineering system design failure and find out the faults in the requirements identification that led to the failure.

  6. Tutorial A leading financial company has decided to develop a multipurpose ATM to deliver cash, accept cash, pay bills, and print pass book. For the operational phase of this machine: (a) Identify at least few operational scenarios and explain them in detail. (b) Develop an input/output trace for two scenarios. (c) Develop an external system diagram (d) Develop a set of originating requirements and prepare the ORD for the operational phase.

  7. Operational Concept Scenario Scenario 1. Customer makes deposits Scenario 2 Emergency situation Fire Unauthorised attempt Breakdown Theft maintenance Scenario 3 Scenario 4 Scenario 5

  8. ORIGINATING REQUIREMENTS • The system shall give an indication of the status • The system shall prompt for an identification and provide opportunity to prove the identity

  9. XYZ Bank Credit Card Customer Customer Customer Another Bank's Account Customer DB Log in / Request Response Response Response Response Log in / Transaction Request Log in / Request Request XYZ ATM Admin Response Log in / Network Service Transaction Request Diagnostic ATM System Response Fill up w/ Cash Response ABC Transaction Retrieve ATM Service Providers Request Network Deposits Log in / Response Request Service Fraud / Break-in Transaction Diagnostic Request Reports Response PQR HW Maint. Unfriendly Network Bank Customer Management

  10. Group ASSIGNMENT II A leading electronics gadget manufacturer has decided to develop a multipurpose gadget to store/deliver music, store/retrieve data like address, phone number etc., and provide information on location/navigation etc. For the operational phase of this device: (a) Identify at least 10 operational scenarios and explain them in detail. (b) Develop an input/output trace for three scenarios and identify I/O requirements. (c ) Develop the external system diagram (d )Develop a set of originating requirements and prepare the ORD for the operational phase. (e) Prepare an objective hierarchy for the operational phase

  11. Summary • Six functions of system design process • Define system level design problem • Operational Concept • External Systems • Originating Requirements • Objectives hierarchy • Documentation • Requirement management • ORD

  12. Dr T Asokan asok@iitm.ac.in 044-2257 4707 Principles of Engineering System Design SOFTWARE TOOLS FOR SYSTEM ENGINEERING T Asokan

  13. SysML • SysML is a general purpose modeling language for systems engineering applications. It is a dialect of UML™, the industry standard for modeling software-intensive systems. • It supports the specification, analysis, design, verification and validation of a broad range of systems and systems-of-systems. These systems may include hardware, software, information, processes, personnel, and facilities • The SysML open source specification is publicly available for download, and includes an open source license for distribution and use.

  14. Reproduced with permission from M/s Vitech corporation

  15. Summary • IT enabled system design procedures increase the efficiency of design process • Commercial software are available for system design • CORE, SysML etc. are standard software available for this purpose

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