On-Orbit Assessment of Satellite Structural Properties via Robust Structural Health Monitoring On-Orbit Assessment of Satellite Structural Properties via Robust Structural Health Monitoring An integrated structural health monitoring system (SHM) is proposed to address on-orbit updating of satellite structural properties. The current state of composite satellite systems will be advanced through coordinated research in the areas of in-situ interrogation and damage detection, intelligent information management for damage classification, and proof-of-concept experiments. An information management framework will be developed comprising data mining, compression, and classification, which will lead to a more efficient approach to damage isolation. Important issues such as reducing data from multiple sources and feature extraction due to multiscale damage in composites will also be addressed. The use of multiple waveforms, lamb waves, and chaotic waves will be investigated for damage detection. A fundamental understanding of the physical phenomena that are unique to multiple damage modes and failure mechanisms in composites will be exploited using high fidelity system analysis. The model will provide virtual sensing data, which will lead to a configuration independent damage interrogation methodology for complex satellite structures. The research will investigate the relationship between changes in sensor signals, damage status and system properties. It is expected that the research output will make a number of contributions with a broad impact on the DoD's operationally responsive satellite systems. The modal updates, based on damage status, can be directly linked to the Guidance, Navigation, and Control system to facilitate the satellite performance control as well as determine the suitability of the satellite design. Thus the proposed research will be a paradigm shift in the nation's ability to rapidly produce, field and maintain current and future satellite systems for rapid deployment. Important elements of this research include: (1) methods for in situ interrogation and detection; (2) information management for SHM; (3) experimentation, validation and application. Explicit outcomes from the proposed project will include: Virtual sensing and model based SHM Damage detection methodologies and novel schemes for information management and damage classification Novel techniques for physically meaningful feature extraction Data mining techniques to extract relevant attributes from sensor measurements Connecting state awareness information to modal properties A comprehensive research program on structural health monitoring (SHM) is proposed for estimating damage degradation in composite satellite systems exposed to harsh enviromnents. The proposed SHM system will link damage state to modal property changes, which will enable on-orbit updating of the satellite guidance and control system. A virtual sensing based approach will be used for comparison of the sensor signals to make the detection algorithm baseline independent. High fidelity multiscale composite analysis techniques will be further extended to simulate the performance of slender composite components found in satellites, such as composite booms, subjected to the various loading/operating conditions. Novel detection methodologies and advanced data interrogation techniques will be developed for damage classification and isolation. The health degradation due to global and local damage will be investigated and correlated to system dynamics. This overall goal will be pursued using a multidisciplinary approach including the following primary research topics: Multiscale model for system response and virtual sensing Guided wave methods (multiple excitations and waveforms) for damage interrogation Data mining, feature extraction and damage classification Link sensor information to damage degradation Experiments for model refinement, verification and application
|Effective start/end date||2/25/09 → 2/11/12|
- DOD-USAF: Air Force Research Labs (AFRL): $250,000.00
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