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Adopting Model Based Systems Engineering M 2017 Adopting Model Based Systems Engineering M. Michael Briggs, Joshua Spiegel, Brian Ladson Presented by: M. Michael Briggs Vice President – Engineering 650-265-1988, 650-400-1446 cell, [email protected] Millennium Engineering and Integration Company, November 1, 2017 1 2017 Model-Based Systems Engineering Origins • Alfred North Whitehead (co-authored “Principa Mathmatica” with Betrand Russell, also wrote “Science and the Modern World” in 1925, furthering Philosophy of Science and Process Philosophy. Whitehead Viewed “the world as a web of integrated processes” • Bell Telephone Labs, Douglas Aircraft Co.(1945-1950) Nike air defense systems, MIT: 1st SE course 1950 • RAND Corp (spinoff from Douglas,1947-48) modern System Analysis • K.E. Boulding (1956): “General Systems Theory (GST) is a name which has come into use to describe a level of theoretical model-building which lies somewhere between the highly generalized constructions of pure mathematics and the specific theories of the specialized disciplines- - - -.” • Ludwig von Bertalanffy (Orgasmic System Theory, Cofounder-Soc. General Systems Research SGSR 1956, GST Theory book 1968, Open Systems) “Integrating Philosophy and Theory as Knowledge, and Method and Application as action, Systems Inquiry then is knowledgeable action.” • Talcott Parsons, C, West Churchman, Alfred Emerson, Anatol Rapoport, Béla H. Bánáthy, Howard T. Odum, Eugene Odum, Fritjof Capra, Peter Senge, James Grier Miller among others. page 2 2017 Some Model-Based Systems Engineering (MBSE) Definitions: • “The formalized application of modeling to support system requirements, design, analysis, verification and validation activities beginning in the conceptual design phase and continuing throughout development and later life cycle phases.” INCOSE SE Vision 2020, Jul 2015 • “Models and simulations should be used, to the greatest extent feasible, in systems engineering and program/project risk management; cost and schedule planning; and providing critical capabilities to effectively address issues in areas including but not limited to interoperability, joint operations, and systems of systems across the entire acquisition life cycle.” DoD Digital Engineering Working Group MBSE Applies General Systems Theory to Engineering, Exploiting Computer- aided Definition and Simulation of Fundamental Truths Universally Applicable Across Disciplines, i.e. Anything Subject to the Laws of Nature and Physics page 3 2017 MBSE Approaches Vary in their Simulation Emphasis • Some MBSE definition sources emphasize design intent specification, e.g.: • Architecture, interfaces, I/O & messages, sequencing/timing, modes & states etc. • Other sources emphasize the need for Modeling and SIMULATION, e.g. • Interim DoDI 5000.02, Operation of the Defense Acquisition System, Requires the integration of Modeling&Simulation activities into program planning and engineering efforts: (http://www.dtic.mil/whs/directives/corres/pdf/500002_interim.pdf) • INCOSE SE Vision 2025 (2014) predicts: “Formal systems modeling is standard practice for specifying, analyzing, designing, and verifying systems and is fully integrated with other engineering models”. • MBSE at Millennium Engineering & Integration Co. defines design intent in UML/SysML diagrams then translated to visual programming of dynamic-system simulations supported by data from CAD/Multiphysics and automatic code generation • Functionality/behavior is represented with closed-loop Plant & Software models. • Simulation is vital to every Systems Engineering function, practiced since 1950’s advent of programmable computers & 1970’s introduction of interactive terminalspage 4 2017 Unifying the MBSE Process • MBSE requires “Descriptive Models” early in project to convey & document Requirements, Design Intent, Architectures and desired attributes (e.g. the many UML and SysML diagramming tools). • MBSE requires “Dynamic Models” that can be “simulated” to analytically “test” behavior of concepts and design candidates (e.g. MATLAB/Simulink & other CAE software tools). • Neither category of SW tools performs both of these function sets. Obvious Integrated Solution: exploit XMI to automate transfer of UML/SysML diagram data into a block-diagram programming & simulation tool, & provide for transfer of behavioral auto-generated code back to UML/SysML as desired. page 5 2017 Unifying the MBSE Process with ModelLink Common Architecture Across Design-Intent-Description & Simulation Tools Requirements & Configuration Management System ModelLink UML/SysML Definition Tool Model Exchange: • Export Out: as XMI UML Design • Import: Into MATLAB and Simulation Simulink & Modeling Tool SysML Design Simulation Model Exchange • Export Out: Block Diagram specs to XMI, & generated code to XML/SysML tool loadable files page 6 2017 End-To-End Model-Based Systems Engineering Processes • Requirements Definition & Analysis • Analysis: Functional Analysis & Allocation, Architecture I/O timing etc definition & graphical depiction. Requirements derivation, function flowdown & I/O testing using conceptual first-order algorithms. • Concept Synthesis, Analysis/Testing, Control & Verification • Concept alternatives definition & simulation- based testing • Concept simulation-based performance evaluation to support trade studies, configuration management & control • Systems Engineering Management of Product Design, Realization & Support • Baseline performance evaluation & functional & performance requirements compliance testing & traceability • Reconciliation of simulation models with subsystem acceptance & qual test data • Reconciliation of system test data with system simulation • Simulation-Driven Fault identification & isolation for delivered product support page 7 2017 Key Role of Simulations in MBSE & MBE Delivered Simulation-Driven Capability Fault Diagnosis for Product Support Next Generation Advanced Concepts UML/SysML Sim-Driven T&E Descriptions & Opeval Performance Requirements Sim-Driven Predictions & Verification Documents Concept Explore Assessment Requirements rebalancing techniques Rhapsody enable performance assessment as a Common Framework M&S-based Model function of cost before requirements HWIL Sim-Driven Testbed (Digital, Real- Functional are regimented Verification + Time, HWIL) ModelLink Translates UML/SysML Analysis, T&E Test Diagrams Into Simulink Requirmnts Def Planning Requirements Architectures & Flowdown Rebalancing Tool Updates (in development) Sim- Driven Simulink Simulation Development & Simulation- Design, Simulink Embedded Coder Realtime Simulation Architecture Generated Supported Assessment tailoring generates C/C++ code Code AI&T, sim & Spec into Higher-Level System- Reconciliation Of_systems simulation Frameworks Production Planning & Release Refined Models, Reconciled Into Fabrication Against Test Data High-Fidelity Communications HW/SW Algorithms Interface Development Derived From DoD Systems Engineering Process (DAG Ch. 4) 15 2017 An End-to-End Model-Based Systems Engineering Process V&V Reports STAKEHOLDER OPERATIONAL SUPPORT NEEDS & Requirements Verification & Traceability Matrix, Verification Strategy Requirements CONSTRAINTS CM & SIM-DRIVEN RISK MANAGEMENT Criticality & Design V&V Intended Uses Risks Risk Register & Design Reports & Criteria Burn-Down Plans Mitigation Results Descriptions REQUIREMENTS, & Test IMPLEMENTATION & VERIFICATION & ARCHITECTURE & Approaches Architecture & INTEGRATION DESIGN-SysML Design VALIDATION Requirements FMECA Master Concept Design / Test and Baselines Hardware Test V&V Derived Test Implementation Test Configuration Plan Requirements Results Info Items Items Simulation-Driven FMECA Acceptance & Eval Capability Iterative Software Tests Assessments Configuration Decomposition & Items Test-By-Test Prediction & Synthesis Reconciliation w/Simulation SIMULINK Hardware- V&V Derived M&S Common Models & In-The- Requirements issues& Auto-Generated Problem Reports Warfighter SW Code Generation Software Loop Feedback Plan Field M&S Descriptions Open Architecture M&S Framework/ Common Models and V&V Results Define Assess Joint M&S Plans Federated Sims System Test & User Feedback Design Verify Subsystem External System M&S Design & Build page 9 2017 Engineering Tools with Block Diagram Programming, Simulation & Code Generation • MATLAB/Simulink/RT-Workshop/Embedded Coder (1992-Present) • Developed & sold by The Mathworks Corp, over a million users • MATRIXx Line: Xmath/SystemBuild/AutoCode (1988-Present) • Developed by Integrated Systems, Inc (ISI), now owned/distributed by NI • CTRL-C/Model-C: Developed by Systems Control Technology (~1977-1992) • Purchased by ISI in 1992 and EOL’d • ACSL with Protoblock: Late 1980’s, ACSL lives on, Protoblock disappeared • EASY-5: MSCsoftware for Simulation only (Boeing Code Generator Retained Inhouse) • LabVIEW Real Time : by National Instruments • SCADE: Esterel Technologies (France), DO-178B Qualified, • IEC 61508 & EN 50128 Certified, HQ Elancourt, France & Mountain View, CA • SciLab/Scicos: Offered by INRA (France) • OTHERS: SystemView, Visual System Simulator, VisSim, ASCET-SE, VAPS page 15 2017 Phased Strategic MBSE Adoption Approach • Planning for MBSE Adoption • Project-Specific Modeling Standards & Guidelines • Hands-On Training • Starting New Projects or Project Segments with MBSE Payoffs: “The Promised Land”: • Dramatic Reduction in time/effort/cost to System Concept Review • Robust concept tested & verified via appropriate-fidelity simulations • Handoff of baseline concept definition/specification as visual & executables
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