IVHM Modeling

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IVHM Modeling

• NASA Ames Research Center

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Agenda June 27/28 2002

• Background, history, and status of the tool, and
  AEE integration status
• Inputs and their sources, and interdependencies
  with other tools
• Modeling approach
• Outputs and users/customers of the outputs
• Readiness to support SRR and SRD

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Background and History

• Work with TA-1 and SEI to determine the
  architectures health mgt rqmts
• Define IVHM architecture(s) which meet the
  requirements
• Derive Allocate the respective technology
  requirements
• Develop required IVHM system level technologies
• Oversee Manage subsystem health mgt. technology
  development
• Integrate, Verify and Validate IVHM technologies

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Modeling Approach
Design Modifications
STS Experience
Modeling and Simulation
Requirement Allocations
Economic Analysis
Achievable Subsystem Requirements
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Systems Analysis Optimization

• Establish physical decomposition of the system
• Define the mission objectives and model related
  concepts of operations
• Perform Requirements Management and Functional
  Allocations
• Perform Timeline Analysis and Resource
  Availability
• Perform/support System Safety assessment
• Perform Financial Analysis and Simulation
• Define System IVHM Test Requirements
• Perform Integrated safety and Cost/benefit Trades

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IVHM Requirements Traceability
Discrete Event Sims Using Behavioral Models
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IVHM Component Hierarchy
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IVHM Component Hierarchy
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Behavior Model Review

• Select Type of Simulation To Perform
• Full Simulation
• Simulate Turnaround
• All Simulations Include Behavioral Models
• Crew / Payload
• Mission Planning
• Pre-launch
• Launch
• On-Orbit
• Post Landing
• Depot Maintenance

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Behavior Model - 3rd LayerTypical Turnaround
Process Booster 1 Mechanisms
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Inputs and Their Sources Turnaround Tasks
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Inputs and Their Sources - Mission Profile
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Typical Turnaround Simulation Output
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Sample OutputsTurnaround Booster1 Cost Estimates
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Sample OutputsCrew Mission Cost Estimates
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Customers

• ISAT Dennis Romano
• AEE Donavan Mathias
• Operations Modeling Mike Nix
• Program Office Bill Kahle

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Interdependencies with Other Tools
Baseline Operations timelines costs
Separation abort timing
Probability LOC LOV
Probability LOC LOV
Weight, TTC, power, volume
Requirements Database Analysis Tool (CORE)
Cost of operations
Operations costs timelines
Vehicle DDTE. vehicle TFU, facilities
development costs
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SRR and SRD Support

• Systems Engineering
• Derived system requirements and provided key
  influence to TA-5 RST IVHM Technology
  Requirements
• Analyzed, assessed and identified key IVHM
  technology risks/mitigation task plans
• Traced IVHM Reqs up to Lev I Reqts allocated to
  Subsystems (generic)
• Derived Initial "TA-1 Impact" Statements showing
  empirical cost/safety evidence for IVHM
• Analysis Optimization Process
• Developed and validated a model-based "Analysis
  and Optimization" process for IVHM
• Formally provides cost/benefit analysis and aid
  in optimized definition and allocation of IVHM
  requirements across RLV