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권계시(Kye-Si Kwon),김병헌(Byung-Hun Kim),김상일(Sang-Il Kim),신승주(Seung-Joo Shin),김성진(Seongjin Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A self-sensing circuit for piezo inkjet has been designed in order to monitor the operating condition during printing. In order to verify the circuit, both ink droplet images from strobe LED and vibration signals from the laser vibrometer were measured and compared with self-sensing signal. Experimental results show that selfsensing signal was effective in detecting the pressure wave change due to the bubble trapped in inkjet printhead.
권계시(Kwon, Kye-Si) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.7
A robust damage assessment technique is presented such that the location and severity of damage in structures can be identified using measured modal data. In order to identify the damage efficiently, the concept of design of experiment using orthogonal array is used for screening the main effects of each parameter which corresponds to possible damage location in FE model. Then, Taguchi method, which has been widely used for robust design in industry, is applied to parameter updating in analytical FE model. The numerical simulations of a truss structure show that damages in structure can be located from updated parameters.