Nonlinear Structural Health Monitoring of the Responsive Space Satellite Systems Using Magneto Elastic Active Sensors (MEAS)

Abstract

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)USAF, AFRL AFOSR / PKC SPONSOR/MONITOR'S REPORT875 Randolph St. Room 3112 NUMBER(S)Arlington, VA 22203 DISTRIBUTION / AVAILABILITY STATEMENT SUPPLEMENTARY NOTES ABSTRACTThe project explores application of magneto-elastic active sensors (MEAS) for structural health monitoring (SHM) of responsive space satellite systems. Design, development and fabrication procedures for MEAS are presented and associated electrical and mechanical characteristics are discussed. MEAS miniaturization efforts are highlighted. Examples of MEAS-enabled SHM testing in aerospace structures of simple and complex geometry, such a honeycomb and realistic satellite panels, are provided. Nonlinear SHM methodologies using MEAS are considered and its use for acousto-elastic assessment of bolted joints is recommended. A new SHM methodology -magneto-mechanical impedance (MMI) testing is suggested and explored from both theoretical and practical perspectives. The MMI measurement technique demonstrates ability for non-contact structural dynamic measurements and effectiveness in detection of fatigue damage at early stage, well before onset of fracture and crack development. Analytical and numerical models of MEAS and MMI are suggested. Finally, MEAS capability for recording dynamics of payload during sub-orbital space flight is validated. The results of the sub-orbital flight measurements suggest feasibility of using MEAS in space environment although characterization of dynamic events was not possible due to limitation of the on-board data acquisition system. It is advocated that MEAS could find its own niche in traditional and innovative SHM methodologies. SUBJECT TERMSStructural health monitoring, magnetic, magneto-elastic, embedded ultrasonics, nonlinear diagnostics, space structures, structural joints, sub-orbital. ABSTRACTThe project explores application of magneto-elastic active sensors (MEAS) for structural health monitoring (SHM) of responsive space satellite systems. Design, development and fabrication procedures for MEAS are presented and associated electrical and mechanical characteristics are discussed. MEAS miniaturization efforts are highlighted. Examples of MEAS-enabled SHM testing in aerospace structures of simple and complex geometry, such a honeycomb and realistic satellite panels, are provided. Nonlinear SHM methodologies using MEAS are considered and its use for acousto-elastic assessment of bolted joints is recommended. A new S...

Towards synthetic biological approaches to resource utilization on space missions

“…Substituting this mixture with rsif.royalsocietypublishing.org J. R. Soc. Interface 12: 20140715 PHB, which has a density of 1250 kg m 23 , the required 18 m 3 of habitat has a mass of 22 500 kg. Consider the following unoptimized biomanufacture scenario: two 2000 l bioreactors, each at a working volume of 1500 l, resulting in the production of 111.6 kg d 21 of PHB.…”

“…by three-dimensional printing [ 7 – 11 ]); — replacing cargoes of pre-packaged food (for instance, printing food [ 12 , 13 ]); — developing redundant life support systems for gas purification, water treatment, etc. [ 14 – 16 ]; — tackling diseases and increasing the shelf-life of therapeutics and pharmaceuticals [ 17 – 21 ]; — sensing and monitoring radiation levels and shield strength with light-weight apparatus [ 22 , 23 ]; and — recycling trash (e.g. as three-dimensional printing media [ 8 ] or to augment radiation shields after heat melt compaction [ 24 ]).…”

“…— sensing and monitoring radiation levels and shield strength with light-weight apparatus [ 22 , 23 ]; and…”

“…-sensing and monitoring radiation levels and shield strength with light-weight apparatus [22,23]; and -recycling trash (e.g. as three-dimensional printing media [8] or to augment radiation shields after heat melt compaction [24]).…”