Impedance-based structural health monitoring of thermal protection systems

2006 ◽  
Author(s):  
Benjamin L. Grisso ◽  
Daniel J. Inman
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Thermal Protection ◽  
Thermal Protection Systems ◽  
Structural Health ◽  
Protection Systems

Structural Health Monitoring of Space Vehicle Thermal Protection Systems

2013 ◽  
Vol 558 ◽  
pp. 268-280 ◽  
Author(s):  
Nigel Hoschke ◽  
Don C. Price ◽  
D. Andrew Scott ◽  
W. Lance Richards
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Optical Fibre ◽  
Health Monitoring ◽  
Thermal Protection ◽  
Successful Implementation ◽  
Fibre Bragg Grating ◽  
Thermal Protection Systems ◽  
Structural Health ◽  
Protection Systems

The thermal protection systems of spacecraft are vulnerable to damage from impacts by foreign objects moving at high velocities. This paper describes a proposed novel structural health monitoring system that will detect, locate and evaluate the damage resulting from such impacts. This system consists of a network of intelligent local agents, each of which controls a network of piezoelectric acoustic emission sensors to detect and locate an impact, and a network of optical fibre Bragg grating sensors to evaluate the effect of the impact damage by means of a thermographic technique. The paper concentrates on two issues that are critical to the successful implementation of the proposed SHM system: measurement of the elastic properties of the thermal protection material, knowledge of which is essential to the design and operation of the acoustic emission sensor network; and investigation of the practical feasibility of a switched network of optical fibre sensors.

scholarly journals Damage detection and localisation of CMCs by means of electrical health monitoring

2020 ◽  
Vol 11 (4) ◽  
pp. 929-935
Author(s):  
Tina Staebler ◽  
Hannah Boehrk ◽  
Heinz Voggenreiter
Keyword(s):  
Health Monitoring ◽  
Electrical Resistance ◽  
Thermal Protection ◽  
Sample Length ◽  
Thermal Protection Systems ◽  
Spatially Resolved ◽  
Switching Unit ◽  
Protection Systems ◽  
Sample Width

Abstract Carbon-based composites such as C/C-SiC are used in thermal protection systems for atmospheric re-entry. The electrical properties of this semiconductor material can be used for health monitoring, as electrical resistivity changes with damage, strain, and temperature. In this work, electrical resistance measurements are used to detect damage in a thermal protection system made of C/C-SiC. This can be done in-situ. Damage experiments with $$320\,\hbox {mm}\,\times \,120\,\hbox {mm}\,\times \,3\hbox { mm}$$ 320 mm × 120 mm × 3 mm panel shaped samples were conducted with a multiplexer switching unit to determine up to 288 electrical resistance and voltage measurements per cycle time and spatially resolved. The change in resistance is an indicator for damage, and with the use of post-processing algorithms, the location of the damage can be determined. With these data, inhomogeneous temperatures can be accorded for and damage can be detected. This method reacts even to small damages where less than 0.02% of the monitored surface is damaged. A localisation with a deviation from the real defect of less than 8% in sample width and 17% in sample length is presented.

The structural health monitoring of a mechanically attached thermal protection system

JOM ◽  
2004 ◽  
Vol 56 (3) ◽  
pp. 36-39 ◽  
Author(s):  
Mark Derriso ◽  
William Braisted ◽  
John Rosenstengel ◽  
Martin DeSimio
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Thermal Protection ◽  
Thermal Protection System ◽  
Protection System ◽  
Structural Health
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