Space Systems Engineering
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1 Lecture #03 September 8, 2015 Background of Systems Engineering NASA program planning phases Scheduled milestones Requirements document Work breakdown structure Technology readiness levels Project management tools Design reference missions and CONOPS Earned value management Risk tracking David L. Akin - All rights reserved
2 Overview of Systems Engineering Developed to handle large, complex systems Geographically disparate Cutting-edge technologies Significant time/cost constraints Failure-critical First wide-spread applications in aerospace programs of the 1950 s (e.g., ICBMs) Rigorous, systematic approach to organization and record-keeping 2
3 NASA Lifecycle Overview 3
4 NASA Formulation Stage Overview 4
5 Space Systems Development Process Pre-Phase A Conceptual Design Phase Development of performance goals and requirements Establishment of Science Working Group (science missions) Trade studies of mission concepts Feasibility and preliminary cost analyses Request for Phase A proposals! 5
6 Space Systems Development Process Pre-Phase A Phase A Preliminary Analysis Phase Proof of concept analyses Mission operations concepts Build vs. buy decisions Payload definition Selection of experimenters Detailed trajectory analysis Target program schedule RFP for Phase B studies!! 6
7 Space Systems Development Process Pre-Phase A Phase A Phase B Definition Phase Define baseline technical solutions Create requirements document Significant reviews: Systems Requirements Review Systems Design Review Non-Advocate Review Request for Phase C/D proposals Ends with Preliminary Design Review (PDR) 7
8 Historical Implications of Study Phases from J. A. Moody, ed., Metrics and Case Studies for Evaluating Engineering Designs Prentice-Hall,
9 Implementation Stage Overview 9
10 Space Systems Development Process Pre-Phase A Phase A Phase B Phase C/D Development Phase Detailed design process Cutting metal Test and analysis Significant reviews: Critical Design Review (CDR) Test Acceptance Review Flight Readiness Review Ends at launch of vehicle! 10
11 Space Systems Development Process Pre-Phase A Phase A Phase B Phase C/D Operations and End-of-Life Launch On-orbit Check-out Mission Operations Maintenance and Troubleshooting Failure monitoring End-of-life disposal! Phase E/F 11
12 NASA Project Life Cycle - Milestones from NASA SP rev. 1, NASA Systems Engineering Handbook 12
13 NASA Project Life Cycle - Acronyms from NASA SP rev. 1, NASA Systems Engineering Handbook 13
14 Requirements Document The bible of the design and development process Lists (clearly, unambiguously, numerically) what is required to successfully complete the program Requirements flow-down results in successively finer levels of detail May be subject to change as state of knowledge grows Critical tool for maintaining program budgets 14
15 Akin s Laws of Spacecraft Design - #13 Design is based on requirements. There's no justification for designing something one bit "better" than the requirements dictate. 15
16 DYMAFLEX Stowed Configura/on Deployed Configura/on 16
17 DYMAFLEX Program Mission Statement Investigate the coupled dynamics and associated control mitigation strategies for a free-flying vehicle with a high-performance manipulator performing tasks analogous to satellite servicing Should be a clear, unambiguous, definitive statement of the purpose of the program, and what it will achieve when complete. 17
18 Apollo Program Mission Statement I believe this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to Earth. 18
19 484S16 Program Mission Statement Develop an evolutionary series of technologies and missions within current and projected space exploration budgets that will result in at least one mission with four crew for a 300-day stay at a martian moon outpost by the year
20 DYMAFLEX Program Objectives Develop a microsatellite in the university environment through a program which maximizes opportunities for students to be involved in all aspects of the development process. Leverage three decades of advanced space robotics research in the development and flight demonstration of a space manipulator system Investigate the coupled dynamics and associated control mitigation strategies for a free-flying vehicle with a high-performance manipulator performing tasks analogous to satellite servicing 20
21 DYMAFLEX Mission (L1) Requirements M-1 DYMAFLEX shall include a robotic manipulator M-2 M-3 M-4 M-5 M-6 M-7 DYMAFLEX shall be able to move the manipulator sufficiently fast as to cause larger dynamic coupling between manipulator and host vehicle than currently experienced on flown systems DYMAFLEX shall be able to downlink telemetry of experiments to validate success of algorithms on the ground DYMAFLEX shall operate in an environment where system dynamics dominates perturbations due to environmental effects DYMAFLEX shall be able to introduce unknown values to control system by changing the mass configuration of its end effector DYMAFLEX shall be able to return to a stable attitude after or during dynamic motions of the manipulator DYMAFLEX shall simulate a variety of payload motions to cover desirable sets of future trajectories M-8 DYMAFLEX shall maximize useful life on orbit by accepting new experiments from the ground 21
22 DYMAFLEX System (L2) Requirements S-1 DYMAFLEX shall be able to perform a minimum set of trajectories: a single DOF, multi-axis linear and extended nonlinear S-2 DYMAFLEX shall meet launch program's requirements (see UNP7 Users Guide) S-3 DYMAFLEX shall be able to know its position, orientation, manipulator configuration, and lock state of tip masses S-4 S-5 DYMAFLEX shall have sufficient communications capability to downlink a minimum of TBD Mb of experiment data within life of spacecraft DYMAFLEX shall generate sufficient power (# watts TBD) to execute the minimum set of experiments and communicate results to ground S-6 DYMAFLEX shall have multiple interchangeable tip masses for the manipulator S-7 DYMAFLEX shall have sufficient computational power to perform realtime kinematic and manipulator control calculations S-8 DYMAFLEX shall be able to put itself into a safe mode in the event of a critical anomaly 22
23 DYMAFLEX ROBO (L3) Requirements S1-1 ROBO shall have a 4 DOF manipulator S1-2 ROBO shall be able to change tip masses S1-3 ROBO shall be capable of minimum end effector velocity of TBD m/s S1-4 ROBO shall sense joint position, velocity, and torque S1-5 ROBO shall sense motor controller temperature and current draw S1-6 ROBO shall not extend below the Satellite interface plane (during or after deployment) 23
24 DYMAFLEX STRM (L3) Requirements S2-1 The STRM shall have a natural frequency of at least 100 Hz with a goal of TBD Hz S2-2 The STRM shall withstand g's in the x,y,z direction S2-3 The STRM shall have a factor of safety of 2.0 for yield and 2.6 for ultimate for all structural elements S2-4 STRM shall have a mass less than TBD grams with a goal of less than TBD grams S2-5 STRM shall interface with lightband at satellite interface plane with 24 #1/4 bolts S2-6 STRM shall not extend below Satellite interface plane (during or after deployments) S2-7 STRM shall provide system with solar panels that will provide sufficient power for experiments S2-8 STRM shall ensure CG for DYMAFLEX is within envelope (less than 0.5cm from lightband centerline, less than 40cm above satellite interface plane) S2-9 STRM shall ensure final dimensions of DYMAFLEX meet requirements (50cm x 50cm x 60 cm tall) S2-10 STRM materials shall meet all outgassing and stress corrosion cracking requirements S2-11 STRM shall provide adequate venting such that the pressure difference is less then 0.5 psi with a factor of safety of 2 24
25 Requirements Verification Matrix Single spreadsheet tracking all requirements, sources, status, and documentation Broken down to successively finer levels of detail (frequently 4-6 levels) For a major program, the printed version can run to hundreds of pages Ensures that nothing gets overlooked and everything is done for a purpose 25
26 DYMAFLEX Rqmnts Verification Matrix 26
27 483/484 Level 1 Requirements The program shall adhere to all requirements set by the RASC-AL program and sponsoring agency The system shall be compatible with human spacecraft and launch vehicles currently under development The system shall provide an airlock or other means of supporting extravehicular activity without depressurization The system design shall incorporate the harvesting and processing of in-situ propellants 27
28 ENAE 483/484 Level 1 Requirements The system shall support an overall mission loss of crew probability no greater than The system shall maintain crew cumulative radiation dosage within current NASA limits The program will include details of anchoring and mobility on Phobos and/or Deimos The program will incorporate 30% mass, power, and budget margins throughout Other Level 1 requirements may be added throughout the year 28
29 Interface Control Documents Used to clearly specify interfaces (mechanical, electrical, data, etc.) between mating systems Critical since systems may not be fit-checked until assembled on-orbit! Success of a program may be driven by careful choices of interfaces KISS principle holds here ( keep it simple, stupid ) 29
30 Akin s Laws of Spacecraft Design - #15 (Shea's Law) The ability to improve a design occurs primarily at the interfaces. This is also the prime location for screwing it up. 30
31 System Block Diagrams Shows interrelationships between systems Can be used to derive communication bandwidth requirements, wiring harnesses, delineation of responsibilities Created at multiple levels (project, spacecraft, individual systems and subsystems) 31
32 Exo-SPHERES S/C Block Diagram Regulator! RCS! Thrusters (x 16)!! Tank!! Valves!! EPS! Charger! Batteries! STRM! Tank!! Kibo Airlock! Interfaces! Access Hatches! Restraints! Cushioning! C&DH! Disk Storage! CPU! Sensors! (TDB)! Wiring Harness! ADCS! Reaction Wheel (TDB)! (x3)! 9 DOF IMU (TDB)! (x 3)! THRM! SFT! OS! Scheduling! ADCS! RCS! COMM! ROBO! Active (TDB)! Passive (TDB)! High Bandwidth! XPNDR! (TBD)! Low Bandwidth! XPNDR! (TBD)! COMM! VIS! Forward Camera (x2)!! Aft Camera! Lights (TDB)! AMP! Payload! Antenna! (TBD)! Antenna! (TBD)! Antenna! (TBD)! Antenna! (TBD)! 32
33 Exo-SPHERES RCS Block Diagram oi 33
34 Work Breakdown Structures Detailed outline of all tasks required to develop and operate the system Successively finer levels of detail Program (e.g., Constellation Program) Project (Lunar Exploration) Mission (Lunar Sortie Exploration) System (Pressurized Rover) Subsystem (Life Support System) Assembly (CO 2 Scrubber System) Subassembly, Component, Part,... 34
35 NASA Standard WBS Levels 1 & 2 35
36 Standard WBS for JPL Mission Project Name WBS Levels Project Management 01 Project Mgmnt Business Mgmnt Project Sys Eng 02 Project Sys Eng Mission & Nav Design Mission Assurance 03 MA Mgmnt System Safety Science 04 Science Mgmnt Science Team Payload 05 P/L Mgmnt P/L Sys Eng Flight System 06 Spacecraft Contract Flt Sys Mgmnt Mission Ops System 07 Mission Ops Mgmnt MOS Sys Eng Launch System 08 Launch Services Risk Mgmnt Project SW Eng Environments Sci Data Support Instrument Flt Sys - Sys Eng Ground Data Sys Project Plng Spt Information Systems Reliability Sci Investigatio & Ops Spt Instrument N Power Subsys Operations Review Support Config Mgmnt EEE Parts Eng Sci Environment Characterization Common P/L Systems Command & Data S/s MOS V&V Facilities Planetary Protection HW Q&A Education & Outreach P/L I&T Telecomm Subsys Foreign Travel/ITAR Launch Sys Eng SW Q&A Mechanical Subsys Project V&V Contamination Control Thermal Subsys SW IV&V Propulsion Subsys GN&C Subsys Spacecraft Flt SW Testbeds Spacecraft assembly test & verification ENAE 483/788D - Principles 06.12of Space Systems Design
37 Detail across JPL WBS Level II 1. Project Management 2. Project Systems Engineering 3. Mission Assurance 4. Science 5. Payload 6. Flight System 7. Mission Operations System 8. Launch System 37
38 Standard WBS for JPL Mission Project Name WBS Levels Project Management 01 Project Mgmnt Business Mgmnt Project Sys Eng 02 Project Sys Eng Mission & Nav Design Mission Assurance 03 MA Mgmnt System Safety Science 04 Science Mgmnt Science Team Payload 05 P/L Mgmnt P/L Sys Eng Flight System 06 Spacecraft Contract Flt Sys Mgmnt Mission Ops System 07 Mission Ops Mgmnt MOS Sys Eng Launch System 08 Launch Services Risk Mgmnt Project SW Eng Environments Sci Data Support Instrument Flt Sys - Sys Eng Ground Data Sys Project Plng Spt Information Systems Reliability Sci Investigatio & Ops Spt Instrument N Power Subsys Operations Review Support Config Mgmnt EEE Parts Eng Sci Environment Characterization Common P/L Systems Command & Data S/s MOS V&V Facilities Planetary Protection HW Q&A Education & Outreach P/L I&T Telecomm Subsys Foreign Travel/ITAR Launch Sys Eng SW Q&A Mechanical Subsys Project V&V Contamination Control Thermal Subsys SW IV&V Propulsion Subsys GN&C Subsys Spacecraft Flt SW Testbeds Spacecraft assembly test & verification ENAE 483/788D - Principles 06.12of Space Systems Design
39 Detail in JPL Flight Systems Column 1. Spacecraft Contract 2. Flight Systems Management 3. Flight Systems - Systems Engineering 4. Power Systems 5. Command and Data Handling Systems 6. Telecommunications Systems 7. Mechanical Systems 8. Thermal Systems 9. Propulsion Systems 10.Guidance, Navigation, and Control Systems 11.Spacecraft Flight Software 12.Testbeds 13.Spacecraft Assembly, Test, and Verification 39
40 Akin s Laws of Spacecraft Design - #24 It's called a "Work Breakdown Structure" because the Work remaining will grow until you have a Breakdown, unless you enforce some Structure on it. 40
41 Systems Team Design Problem Develop a set of initial systems definition documents for your term project (483 or 788D), starting from the program statement Program mission requirements (Level 1) Systems mission requirements (Level 2) Systems requirements (at least to Level 3) Requirements verification matrix Work breakdown structure (at least the flight systems column) Submit your files in working format(s), e.g., Powerpoint, Excel spreadsheets, etc. 41
42 Systems Team Problem Grading Rubrik Quality (e.g., appropriateness, completeness, conciseness) of program objectives (10 pts) Quality of requirements lists (20 pts) Detail and flow-down tracking in requirements documents (10 pts) Completeness in work breakdown structure (10 pts) Organization (10 pts) Clarity (10 pts) Evidence of critical thinking (20 pts) Extra effort bonus (10 pts) 42
43 RASC-AL Judging Criteria Synergistic application of innovative capabilities and/or new technologies for evolutionary architecture development to enable future missions, reduce cost, or improve safety; Scientific evaluation and rationale of mission operations in support of an exciting and sustainable space exploration program; A mission concept of operations that includes what occurs at the facility before, during, and after crewed visits (over a period of years); Key technologies, including technology readiness levels (TRLs), as well as the systems engineering and architectural trades that guide the recommended approach; Reliability and human safety consideration in trading various architecture options; Realistic assessment of project plan and execution of that plan, including inclusion of a project schedule and test plan, as well as development and realistic annual operating costs (i.e., budget) 43
44 Technology Readiness Levels TRL 9 TRL 8 TRL 7 TRL 6 TRL 5 TRL 4 TRL 3 TRL 2 TRL 1 Actual system flight proven through successful mission operations Actual system completed and flight qualified through test and demonstration System prototype demonstration in the real environment System/subsystem model or prototype demonstration in a relevant environment Component and/or breadboard validation in relevant environment Component and/or breadboard validation in laboratory environment Analytical and experimental critical function and/or characteristic proof-of-concept Technology concept and/or application formulated Basic principles observed and reported 44
45 PERT* Charts Task Title Task Duration Slack Time Earliest Starting Date Earliest Completion Date *Program Evaluation and Review Technique 45
46 The Critical Path and Slack Time 46
47 The Critical Path and Slack Time 47
48 Cascading Slack Time 48
49 Gantt* Charts ID Task Name Duration Start Finish Predec 1 Design Robot 4w Tue 9/3/02 Mon 9/30/02 2 Build Head 6w Tue 10/1/02 Mon 11/11/ Build Body 4w Tue 10/1/02 Mon 10/28/ Build Legs 3w Tue 10/1/02 Mon 10/21/ Assemble 2w Tue 11/12/02 Mon 11/25/02 2,3,4 September October November 9/1 9/8 9/15 9/22 9/29 10/6 10/13 10/20 10/27 11/3 11/10 11/17 11/24 12/1 *developed by Charles Gantt in
50 Some Pitfalls of Project Management 50
51 Akin s Laws of Spacecraft Design - #23 The schedule you develop will seem like a complete work of fiction up until the time your customer fires you for not meeting it. 51
52 Design Reference Missions Description of canonical mission(s) for use in design processes Could take the form of a narrative, storyboard, pictogram, timeline, or combination thereof Greater degree of detail where needed (e.g., surface operations) Created by eventual users of the system ( stakeholders ) very early in development cycle 52
53 Concept of Operations Description of how the proposed system will accomplish the design reference mission(s) Will appear to be similar to DRM, but is a product of the design, rather than a driving requirement Frequently referred to as CONOPS, showing DOD origins 53
54 Space Systems Architecture Description of physical hardware, processes, and operations to perform DRM Term is used widely (e.g., software architecture, mission architecture, planning architecture ), but refers to basic configuration decisions Generally result of significant trade studies to compare options 54
55 ESAS Final Architecture/CONOPS 55
56 X-Hab SRR/SDR (9/15/15 1-2pm EDT) Systems Requirements Review/Systems Design Review Agenda Identify team members Review vision, mission, goal and objectives of Project Review system architecture (includes system definition, concept and layout) Review Level 1 requirements Review traceability of requirements flow down Review Work Breakdown Structure (WBS) Review preferred system solution definition including major trades and options. CAD model of physical components of system if available. Review preliminary functional baseline Review draft concept of operations Review preliminary system software functional requirements Review risk assessment and mitigations approach Review analysis tools to be used Review cost and schedule data Review software test plan (approach) Review hardware test plan (approach) 56
57 X-Hab SRR/SDR Success Criteria Systems requirements (based on mission as described by NASA) are understood and defined, and form the basis for preliminary design. All requirements are allocated, and the flowdown (subsystems, etc.) is adequate The requirements process is defined and sound, and can reasonably be expected to continue to identify and flow detailed requirements in a manner timely for development of project, post SDR The technical approach is credible and responsive to the identified requirements. Technical plans have been updated, as necessary, from initial proposal. Trades have been identified, and those planned prior to PDR/CDR adequately address the trades/options. Any significant development or safety risks are identified, and a process exists to manage risks The ConOps is consistent with any proposed design concepts and is aligned with the Level 1 requirements. Review demonstrates a clear understanding of customer and stakeholder needs. 57
58 Earned Value Management Method of tracking progress on large programs Initially supported by DOD Assesses earned value by fraction of task completed vs. cost allocated to task Earned value tracked against expenditures to see where program compares to nominal schedule Details will not be covered in class, but are in the lecture notes online You will be held responsible for this material 58
59 Earned Value Management Additional information - not presented in lecture Consider a simple program with four two-month tasks that are expected to cost various amounts $4 M $10 M $6 M $8 M $2M $7M $8M $7M $4M Planned monthly costs Months 59
60 Program Cost Accounting Additional information - not presented in lecture Traditionally monitored by burn rate - cumulative expenditures with time Costs ($M) Cumulative Months 60
61 Earned Value Management - Month 1 Additional information - not presented in lecture In the first month, you complete 60% of task 1 and 10% of task 2 Actual costs for month 1 = $3 M EV=$3.4 M $4 M EV(1)=0.6*4=$2.4 M $10 M EV(2)=0.1*10=$1 M $6 M $8 M Months 61
62 Earned Value Management - Month 2 Additional information - not presented in lecture In the second month, you complete 100% of task 1 and 60% of task 2 Actual costs for month 2 = $10 M EV=$10 M $4 M EV(1)=1.0*4=$4 M $10 M EV(2)=0.6*10=$6 M $6 M $8 M Months 62
63 Earned Value Management - Month 3 Additional information - not presented in lecture In the third month, you complete 100% of task 1, 80% of task 2, and 40% of task 3 Actual costs for month 3 = $16 M EV=$14.4 M $4 M EV(1)=1.0*4=$4 M $10 M EV(2)=0.8*10=$8 M $6 M EV(3)=0.4*6=$2.4 M $8 M Months 63
64 Program Cost Accounting - Tracking Additional information - not presented in lecture Plotting actual costs vs. time shows how money is spent, but doesn t tell anything about how much work has been accomplished 25 Costs ($M) Cumulative Actual Months 64
65 Program Cost Accounting - Tracking Additional information - not presented in lecture Earned value tracks accomplishments against their planned costs Variation shows schedule performance Costs ($M) Cumulative Earned Value Months 65
66 Program Cost Accounting - Tracking Additional information - not presented in lecture Comparing earned value to actual costs shows apples to apples comparison of money spent and value achieved 25 Costs ($M) Cumulative Earned Value Actual Months 66
67 Decision Analysis Tools A number of different approaches exist, e.g. Decision Matrices (aka Pugh Method) Quality Function Deployment Six Sigma Analytic Hierarchy Process (details in notes) Generally provide a way to make decisions where no single clear analytical metric exists - quantifying opinions Allows use of subjective rankings between criteria to create numerical weightings Not a substitute for rigorous analysis! 67
68 Analytical Hierarchy Process Additional information - not presented in lecture Considering a range of options, e.g., ice cream Vanilla (V) Peach (P) Strawberry (S) Chocolate (C) Could ask for a rank ordering, e.g. (1) vanilla, (2) strawberry, (3) peach, (4) chocolate - but that doesn t give any information on how firm the rankings are Use pairwise comparisons to get numerical evaluation of the degree of preference 68
69 Pairwise Comparisons Additional information - not presented in lecture Ideally, do exhaustive combinations Vanilla >> chocolate (strongly agree) Vanilla >> peach (agree) Vanilla >> strawberry (agree) Peach >> chocolate (strongly agree) Peach >> strawberry (disagree) Strawberry >> chocolate (strongly agree) Number of required pairings out of N options is (N)(N-1)/2 - e.g., N=20 requires 190 pairings! Can use hierarchies of subgroupings to keep it manageable 69
70 Evaluation Metric Additional information - not presented in lecture Create a numerical scaling function, e.g. strongly agree = 9 agree = 3 neither agree nor disagree = 1 disagree = 1/3 strongly disagree = 1/9 Numerical rankings are arbitrary, but often follow geometric progressions 9, 3, 1, 1/3, 1/9 8, 4, 2, 1, 1/2, 1/4, 1/8 70
71 Evaluation Matrix Additional information - not presented in lecture Fill out matrix preferring rows over columns C S P V C S 9 P 9 1/3 V
72 Evaluation Matrix Additional information - not presented in lecture Fill out matrix preferring rows over columns Fill opposite diagonal with reciprocals C S P V C S P V C C 1/9 1/9 1/9 S 9 S 9 3 1/3 P 9 1/3 P 9 1/3 1/3 V V 9 3 3
73 Normalization of Matrix Elements Additional information - not presented in lecture Normalize columns by column sums C S P V C S P V C 1/9 1/9 1/9 C S 9 3 1/3 S P 9 1/3 1/3 P V V
74 Evaluation of Hierarchy Among Options Additional information - not presented in lecture Average across the populated row elements C S P V C S P V Top ranking 74
75 Risk Tracking There are two elements of risk How likely is it to happen? ( Likelihood ) How bad is it if it happens? ( Consequences ) Each issue can be evaluated and tracked on these orthogonal scales This is not an alternative to probabilistic risk analysis (PRA) discussed in a later lecture 75
76 Likelihood Rating Categories 1. Improbable (P<10-6 ) 2. Unlikely to occur (10-3 >P>10-6 ) 3. May occur in time (10-2 >P>10-3 ) 4. Probably will occur in time (10-1 >P>10-2 ) 5. Likely to occur soon (P>10-1 ) 76
77 Consequence Rating Categories 1. Minimal or no impact 2. Additional effort required, no schedule impact, <5% system budget impact 3. Substantial effort required, <1 month schedule slip, >2% program budget impact 4. Major effort required, critical path (>1 month slip), >5% program budget impact 5. No known mitigation approaches, breakthrough required to resume schedule, >10% program budget impact 77
78 Risk Matrix
79 References (Available Online) NASA Systems Engineering Handbook - SP June, 1995 [2.3 Mb, 164 pgs.] (Obsolete, but nice description of NASA's systems engineering approach) NASA Systems Engineering Processes and Requirements - NPR A - March 26, 2007 [3.6 Mb, 97 pgs.] (Current version - pages are almost impossible to read without a magnifying glass) NASA Space Flight Program and Project Management Requirements - NPR D - March 6, 2007 [2.7 Mb, 50 pgs.] (Current version - pages are almost impossible to read without a magnifying glass) NASA Program and Project Management Processes and Requirements - NPR C - March 22, 2005 [1.9 Mb, 174 pgs.] (Older, superceded version, but includes more figures and is readable by mere mortals) NASA Goddard Space Flight Center Procedures and Guidelines: Systems Engineering - GPG B [1.7 Mb, 31 pgs.] NASA Goddard Space Flight Center Mission Design Processes (The "Green Book") [860 Kb, 54 pgs.] NASA Systems Engineering Toolbox for Design-Oriented Engineers - NASA RP-1538, December 1994 [9.1 Mb, 306 pgs] 79
80 Akin s Laws of Spacecraft Design - #38 Capabilities drive requirements, regardless of what the systems engineering textbooks say. 80
81 Today s Tools You should understand and be able to create and use Project scheduling (PERT and Gantt charts, critical path determination) Requirements definition and flow-down Work breakdown structures Risk definition charts Design reference missions Concept of operations (Earned value management) (Analytical hierarchy process) 81
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