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Principles of Engineering System Design

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

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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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