Automated inspection of the RSRM case O-ring seal surface

ODell, Keith P.; McCool, Alex

doi:10.2514/6.2001-3278

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…Experimental studies demonstrated that subsequent increase of absorbed radiation dose leads to reduction of the planar coupling factor and reduction of sensor capacitance. Equations (3) and (5) detail material constants contributing to reduction of these sensor parameters. An electromechanical impedance model of the sensor is suggested, in which effect of radiation is accounted for using progressive changes of piezoelectric, dielectric, and elastic constants of the piezoelectric ceramic.…”

Section: Electromechanical Impedance Model Accounting For Effect Of Gmentioning

confidence: 99%

“…After the Columbia shuttle disaster in which the wing of the craft was damaged by foam tile impact, the National Aeronautics and Space Administration began to implement nondestructive evaluation and SHM into the inspection regimen [1]. Inspection methods employed by National Aeronautics and Space Administration include eddy current, X-ray and thermography [2], three-dimensional laser reconstruction [3], as well as imaging techniques [4] for many parts before and after test flights. These methods are used primarily after visual inspections to identify areas of concern or repair.…”

Section: Introductionmentioning

confidence: 99%

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Investigating Effect of Space Radiation Environment on Piezoelectric Sensors: Cobalt-60 Irradiation Experiment

Anderson

Zagrai

Daniel³

et al. 2017

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems

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Piezoelectric sensors are used in many structural health monitoring (SHM) methods to interrogate the condition of the structure to which the sensors are affixed or embedded. Among SHM methods utilizing thin wafer piezoelectric sensors, embedded ultrasonics is seen as a promising approach to assess condition of space structures. If SHM is to be implemented in space vehicles, it is imperative to determine the effects of the extreme space environment on piezoelectric sensors in order to discern between actual structural damage and environmental effects. The near-Earth space environment comprises extreme temperatures, vacuum, atomic oxygen, microgravity, micrometeoroids and debris, and significant amounts of radiation. Gamma radiation can be used to emulate the space radiation environment. In this contribution, the effects of gamma radiation on piezoelectric ceramic sensors are investigated for equivalent gamma radiation exposure of more than a year on low Earth orbit (LEO). Two experiments were conducted in which cobalt-60 was utilized as the source of radiation. Freely supported piezoelectric sensors were exposed to increasing levels of gamma radiation. Impedance data were collected for the sensors after each radiation exposure. The results show that piezoelectric ceramic material is affected by gamma radiation. Over the course of increasing exposure levels to cobalt-60, the impedance frequencies of the free sensors increased with each absorbed dose. The authors propose that the mechanism causing these impedance changes is due to gamma rays affecting piezoelectric, electric, and elastic constants of the piezoelectric ceramic. A theoretical model describing observed effects is presented.

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Section: Electromechanical Impedance Model Accounting For Effect Of Gmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating Effect of Space Radiation Environment on Piezoelectric Sensors: Cobalt-60 Irradiation Experiment

Anderson

Zagrai

Daniel³

et al. 2017

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems

View full text Add to dashboard Cite

show abstract

“…Colet [6] concludes that many industries are beginning to adopt universal quality inspection with cost-effective machine vision systems for optimum quality. O'Dell [7] proposes an automated system to inspect the O-ring sealing surfaces on the space shuttle reusable solid rocket motor (RSRM) case segment joints. A laser digitizing system is used to create a three-dimensional map of the O-ring sealing surfaces, which are further analysed and inspected for any irregularities.…”

Section: Related Workmentioning

confidence: 99%

Automated inspection using database technology within the aerospace industry

Tiwari¹,

Vergidis²,

Lloyd³

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part B:

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Many manufacturing processes have become fully automated resulting in high production volumes. However, this is not the case for inspection. Shortening the inspection times in manufacturing industry using the available information resources can result in the reduction of production lead-time and overall costs. Rapid advances in machine tool technology have resulted in fast processing Computer Numerical Control (CNC) machines that are capable of manufacturing parts at high speeds, turning their manual inspection process into a bottleneck. However, many CNC machines record the operations that they perform as Realisation Logs. This paper proposes an approach that utilises these Realisation Logs for automating the inspection process. The automation occurs with the implementation of a software tool that imports and compares the Realisation Logs with the Manufacturing Instructions for a manufactured part. The output of the tool is an Inspection Report that lists all the identified skipped or mishandled operations for that part. The proposed inspection approach is compared with the manual practice within an Aerospace manufacturer. The results demonstrate drastic reduction in production lead-time while producing accurate and reliable Inspection Reports in an automated manner.

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Automated inspection of the RSRM case O-ring seal surface

Cited by 2 publications

References 1 publication

Investigating Effect of Space Radiation Environment on Piezoelectric Sensors: Cobalt-60 Irradiation Experiment

Investigating Effect of Space Radiation Environment on Piezoelectric Sensors: Cobalt-60 Irradiation Experiment

Automated inspection using database technology within the aerospace industry

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