Han Park

Analysis of Space Shuttle main engine data using beacon-based exception analysis for multi-missions

This paper describes analysis of Space Shuttle Main Engine (SSME) sensor data using Beacon-based Exception Analysis for Multimissions (BEAM), a new technology developed for sensor analysis and diagnostics in autonomous space systems by the Jet Propulsion Laboratory (JPL). The BEAM anomaly detection system has been applied to SSME in a joint effort between JPL and the Marshall Space Flight Center (MSFC). MSFC is evaluating BEAM as an automated tool for rapid analysis of SSME ground-test data. BEAM is an end-to-end method of data analysis intended for real-time (on-board) or non-real-time anomaly detection and characterization. For the SSME application, a custom version of BEAM was built to analyze data gathered during ground tests. Since BEAM consists of modular components, a custom version can be tailored to address specific applications and needs by mixing-and-matching components. The initial build of BEAM for the SSME focuses on signal processing and contains three components: Coherence-based Fault Detector (CFD), Dynamical Invariant Anomaly Detector (DIAD), and Symbolic Data Model (SDM). This paper describes the software environment, its training steps, and the analysis results of the SSME data using the DIAD module.

Integrated virtual test bed for ivhm systems on 2nd generation RLV

The IVHM Virtual Test Bed (IVTB) is a systems integration and test facility being developed by Northrop Grumman Corporation and the Jet Propulsion Laboratory, along with NASA partners Glenn Research Center and Ames Research Center. Its purpose is to support the demonstration and validation of Integrated Vehicle Health Management (IVHM) technologies for NASAs 2nd Generation Reusable Launch Vehicle program. The IVTB will be used to validate spacecraft health management system designs, and to infuse, evaluate, and mature new technologies. The IVTB will be used to identi@ and resolve problems at the early stages of development and facilitate technology transfer. In addition, the IVTB can be used for assembling and testing ground and spacecraft elements using the distributed environment capabilities, and supporting post launch operations and mission scenario testing. As a proof-of-concept, a simulation of the X-34 RLV propulsion feed system and liquid oxygen tank structure was chosen. The experiment will use a hierarchical health management system wherein a system-level IVHM will collect and analyze the subsystem-level diagnostics to demonstrate capabilities not possible with only subsystem level information. 1.