The NASA IVHM Technology Experiment for X-37

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The NASA IVHM Technology Experiment for X-37

Mark Schwabacher NASA Ames Research Center

Space Transportation Technology IVHM Session

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• Long-term goal: Reduce cost and increase reliability of space transportation

• Demonstrate benefits of in-flight IVHM to the operation of a Reusable Launch Vehicle

• Advance this IVHM technology to Technology Readiness Level ~7 within a flight environment

• Operate IVHM software on the Vehicle Management Computer


Technology Goals and Objectives

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• Unpiloted • Reusable • 27.5 feet long • Mission :

• launch from Shuttle's cargo bay

• orbit Earth 21 days • De-orbit and land on

runway autonomously

• First flight in 2002 • Being built by Boeing

for NASA MSFC


Background: X-37

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• Livingstone automates system-level fault diagnosis • Qualitative, Model-based Reasoning

• Searches system-wide interactions to detect and isolate failures • Eliminates 'hardwiring' pre-defined set of failures • Updating and verifying the model is straightforward • Streamlines development and maximizes code reusability

• Accomplishment: Successfully flown on Deep Space One • Also scheduled to fly on X-34


Background: Livingstone

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System model

Vehicle Management Computer


Experiment Overview

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• Monitor and diagnose: • Electro-Mechanical Actuators (EMA) for control

surfaces • Associated Electrical Power System

components • Real-time fault detection and isolation • Diagnosis, not prognosis • Shadow mode only (no reconfiguration

commands) • Generate advisory recommendations for ground

ops


X-37 IVHM Scope

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'A Space Transportation Technology IVHM Session

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Inferred Failure

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• The IVHM Experiment's outputs will be provided as inputs to the X-37 Informed Maintenance (1M) Experiment

• The 1M software will run in the X-37 ground station, processing IVHM Experiment flight data in real-time

• 1M Experiment is being performed by NASA KSC and Boeing

• The 1M Experiment's goal is to reduce the cost and time needed to maintain the vehicle


X-37 Informed Maintenance Experiment

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• During the second orbital mission, we will use simulated faults to demonstrate the IVHM software's ability to diagnose them


Simulated Faults

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• Livingstone ported from LISP to C++ under VxWorks

• Preliminary design of Interface with Boeing software completed

• Knowledge of X-37 subsystems gained from Boeing experts

• First subset of X-37 model completed


Current Status

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• Limited vehicle resources available to IVHM .CPU • Memory • Telemetry • May need to descope experiment to fit resource

constraints • Rigorous software safety standards


Challenges

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• 03/01/01: Deliver IVHM Ver1 Software to Boeing for B-52-based autonomous approach and landing tests

• 03/01/02: Deliver IVHM Ver2 Software to Boeing for orbital flights


Upcoming Milestones

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• Mina Cappuccio: X-37 L3 PM & Expt Programmatic Lead, [email protected], 650-604-1313

• Jeff Samuels: Technical Lead, [email protected], 650-604-4235

• Mark Schwabacher: Software Lead, [email protected], 650-604-4274

• Scott Poll, Kevin Carbajal: X-37 Models & Monitors • Scott Christa, Benoit Hudson: Software Integration & Test • Dan Clancy, Jim Kurien: Consulting


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The NASA IVHM Technology Experiment for X-37

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