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RISS 인기검색어
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- 저자 : R.Sam 박해원(Hae-Won Park) (검색결과 1 건)
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ELECTROMAGNETIC-BASED FORCE SENSOR FOR STRUCTURAL HEALTH MONITORING(SHM)
최만용(Man-Yong Choi),R.Sam,박해원(Hae-Won Park),박정학(Jeong-Hak Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The demand for maintenance of structural health and safety to acceptable standards poses challenges for<br/> research and development of effective technologies for monitoring and measurement of parameters governing<br/> safety and health of structures. In this work, an electromagnetic based sensor has been investigated and<br/> developed for measuring force in pre-stressed steel cables and tendons. The change in magnetic<br/> permeability of a material caused by mechanical stress is exploited to measure force in the material. The<br/> sensor consists of a pair of sensing coils and a pair of reference coils. The sensing coils are wound around a<br/> stressed material while the reference pair are wound on a dummy specimen of same material as that under<br/> stress. When sensing and reference primary coils are excited by same current simultaneously, both the stressed<br/> and dummy materials are equally magnetized by the magnetic field generated by the current, and voltage is<br/> induced in the sensing and reference secondary coils. The induced voltage in each secondary coil is dependent<br/> on a number of factors including the magnetic permeability of its core which is a function of the core<br/> magnetizing current, temperature and stress/load. By suitably arranging the sensing and reference coils<br/> electro-magnetically, the effects of temperature and magnetizing current on the permeability of a stressed<br/> material can be eliminated in the output voltage of the sensor. The output voltage is a function of only the<br/> mechanical load in the stressed material, and can be calibrated for determination of force in pre-stressed<br/> materials.
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