Engineering topics
Publications and source records attributed to Chang, Z..
In-situ sampling and analysis is one of the major tasks in future NASA exploration missions. It is essential that the samples on other planets including Mars are free of contaminations from the earth. Recently, a novel drilling technology that is actuated by a piezoelectric drive mechanism was developed at it is called Ultrasonic/Sonic Driller/Corer.
An Ultrasonic drilling/coring mechanism (USDC) has been developed for future NASA exploration missions.
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Future NASA exploration missions to Mars, Europa, Titan, comets and asteroids are seeking to perform sampling, in-situ analysis and possibly return of material to Earth for further tests.
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Future NASA exploration missions to Mars, Europa, Titan, comets and asteroids are seeking to perform sampling, in-situ analysis and possibly return of material to Earth for further tests. One of the major limitations of sampling in low gravity environments is the conventional sampling in low gravity environments is the conventional drills need for high axial force. An ultrasonic/sonic driller/corer (USDC) mechanism was developed to address these and other limitations of existing drilling techniques.
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Future NASA missions to Mars require sampling techniques for in-situ analysis and/or sample return to Earth. One of the major limitations of sample collection on Mars and other low gravity environments using conventional drilling is the need for high axial force during drilling.
This paper is concerned with the calculation of elastic wavefields in strongly heterogeneous media containing scatters of arbitrary shape and size.
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Increasingly NASA experiments, instruments and applications are requiring pumps that are miniature and consume low power.
The Leaky Lamb wave (LLW) technique is approaching a maturity level that is making it an attractive quantitative NDE tool for composites and bonded joints.
The use of obliquely insonified ultrasonic waves has shown great promise in providing information about flaw characteristics and material properties of composite materials.
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