National Aeronautics National Aeronauticsand and Space Space Administration Administration Title Master www nasa gov Slide Master fjufgjfgjfj Your Title Here 2 National Aeronautics and Space Administration Chapter 2 The Systems Engineering SE Process A True Story Scene Student talking to professor during long car ride to visit senior project sponsor Student You know Professor the easiest class I ever had was Thermodynamics Professor What Why was that Student Because it has only one formula www nasa gov Notes to the Professor The same presentation shown here is available in CHAPTER X on the WEBPAGE GOAL Teach SE in 1 2 weeks Learning Acceleration Techniques 1 Led by the professor System Engineering is invented by the class without it being formally introduced An Original Thought Exercise 2 The common types of subsystems are introduced 3 Students apply the single SE formula 4 Students can see examples of every SE function in Chapter X on the WEBPAGE Your Title Here 4 The Problem that Process Solves The problem is By what process could be created and operated a system or product that is complex requires the skills of different engineering disciplines is reliable with low risk of failure with reduced chance of cost overruns and a shortened development time Your Title Here 5 Terminology The Hierarchy and Elements Elements of a system are not just hardware but can also include software and can even include people facilities policies documents and databases System an integrated set of elements that accomplish a defined objective What is to be created Subsystem is a system in its own right except it normally will not provide a useful function on its own it must be integrated with other subsystems or systems to make a system Components are elements that make up a subsystem or system Parts are elements on the lowest level of the hierarchy Your Title Here 6 Position Controlled Dish Antenna System A dish antenna system on earth that receives a radio signal from a satellite and that will automatically point the dish toward the satellite moving across the horizon Motor Control Subsystem motor position and velocity sensors controller software wires motor is a component Structures Subsystem Communications Subsystem electronics dish is a part Electrical Power Subsystem Your Title Here 7 Imagine Designing a Part Component or Subsystem Imagine you were asked to design a part component or subsystem for example a can opener a mousetrap a bicycle an automotive suspension etc Question What process would you follow Answer The Engineering Design Process EDP Your Title Here 8 The Engineering Design Process EDP Project Definition meet with stakeholders define the mission objective s understand the problem Requirements Definition and Engineering Specifications carefully and thoughtfully develop requirements that will guide the design creation to follow Clearly document the requirements and receive stakeholder approval before proceeding Conceptual Design generate ideas compare using trade studies models proof of concept prototypes down select to focus on a meritorious concept in the next step Product Design Fabrication and Test complete all detailed drawings make or purchase parts and components assemble and measure performance If performance requirements are met begin manufacturing Your Title Here 9 Now Consider Designing a System Made Up of Many Subsystems EDP Doesn t offer much guidance for a complex system made up of many subsystems although it would be applicable for design of any subsystem Your Title Here 10 Common Subsystem Types Although quite different products there are common types of subsystems in satellites rockets and rovers Your Title Here 11 Classroom Discussion 1 What subsystems might be needed for a teleoperated lunar excavator Note that In order to create a system to meet the mission objective design teams would eventually be formed one team for each expected subsystem These specialty design teams will be applying the EDP to design their own subsystem The teams will also be applying Concurrent Engineering where multiple subsystems are being designed simultaneously by different teams with strong collaboration across boundaries of subsystems and disciplines The objective of concurrent engineering is to reduce the produce development cycle time through a better integration of activities and processes NASA Systems Engineering Handbook SP 601S Your Title Here 12 Classroom Discussion 2 List all the tasks you think should be performed to make sure that separately designed subsystems when integrated together will create a system able to perform the mission The instructor should allocate enough time for the class to discuss and the professor lists the answers on the board Alternatively the class may be broken up into teams of 5 students that work together for 15 minutes and then each team lists their answers on the board After this exercise students will hopefully have a good feel for what Systems Engineering is without it having been defined yet Your Title Here 13 So Now What is Systems Engineering SE Systems Engineering SE is the engineering process to create a system It is a structured process based on concurrent engineering and that incorporates the Engineering Design Process Systems Engineering SE is a disciplined approach for the definition implementation integration and operations of a system product or service with the emphasis on the satisfaction of stakeholder functional physical and operational performance requirements in the intended use environments over its planned life cycle within cost and schedule constraints Systems Engineering includes the engineering activities and technical management activities related to the above definition considering the interface relationships across all elements of the system other systems or as a part of a larger system NASA Systems Engineering Handbook SP 601S Your Title Here 14 The Single Systems Engineering Formula SE Vee 11 SE Functions Tools Your Title Here 15 SE Vee 11 SE Functions Tools Your Title Here 16 The Vee is a Process Model In each box are the objectives of the Phase For each box on left leg apply the 11 SE Functions to achieve the objectives Process Move Down Left Leg completing each and every Phase sequentially then move up the right leg Pre Phase A Concept Studies Produce a Broad Spectrum of Ideas Phase A Concept and Technology Development Through trade studies achieve a Single System Architecture with requirements Phase B Produce a