http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
골수술용 압전형 초음파 의료기기 개발을 위한 유한요소해석 및 이의 실험적 검증
송태하,이중호,최종균,이희원,Song, Tae-Ha,Lee, Jung-Ho,Choi, Jong Kyun,Lee, Hee Won 대한의용생체공학회 2022 의공학회지 Vol.43 No.5
In this study, the optimal driving frequency was derived through finite element analysis (FEA) to optimize the developed piezoelectric ultrasonic medical devices(PUMD) for bone surgery. The core of the PUMD is the piezoelectric ceramic (PZT), which is a vibrator that generates vibration energy. The piezoelectric ceramic shows the maximum current value with respect to the input voltage at the resonance frequency, which generates the maximum mechanical vibration. In the past, various studies have been conducted related to the analysis of PUMD, but most of the research so far has been limited to free vibration analysis. However, in order to derive the accurate resonant frequency, the initial stress generated by bolt tightening in the bolt-clamped Langevin type transducer (BLT) must be considered. In this study, after designing a PUMD, the driving performance according to the bolt tightening value was analyzed through FEA, and this was experimentally verified. First, the resonance mode and frequency response were confirmed through modal and harmonic analysis at 20-40 kHz, which is known as the optimal driving frequency band of PUMD for bone surgery. In addition, the design of the PUMD was confirmed by checking the mechanical behavior of the tip and the piezoelectric ceramic at the resonant frequency. Consequentially, the characteristic evaluation was performed, and it was confirmed that the resonant frequency result derived through the FEA was reasonable. Through this study, we presented a more rational FEA method than before for BLT transducers. We expect that this will shorten the time and cost of developing a PUMD, and will enable the development of more stable and high-quality products.
이동욱(Lee, DongWook),전의식(Jeon, Euy-Sik) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
최근 미세접합 기술이 다양한 사회에서 주목받고 있다.미세접합 기술은 레이저 접합 초음파 접합 등이 있다.그러나 미세 접합의 연구가 많이 부족한 실정이다.이에 본 논문에서는 초음파 접합장치 구동 시 열평형 상태에서 압전소자에 열 영향을 최소화하기 위해 냉각관을 설계하였다.또한 냉각관이 설계된 초음파 접합 장치를 이용하여 접합 실험을 실시하였다. 다꾸찌 실험계획법을 이용하여 실험을 실시하였으며,기초실험을 통해 공정변수와 반응 변수를 설정하였다.접합 실험의 신 뢰도를 검증하기 위하여 접합 계면의 미세조직을 관찰하였고,인장실험을 통해 접합 강도를 확인하였다. Recently, the micro bonding technology comes into the spotlight as the miniaturization of the electronic product. The micro bonding technique can classify by way of laser welding and ultrasonic bonding and etc. However, the research on the micro bonding is much lacks. In this paper, carried out the cooling analysis of the 60 [kHz] ultrasonic bonding equipment to know heat effect of the piezoelectric element when the ultrasonic bonding equipment was operated. The ultrasonic horn having the natural frequency with 60 [kHz] for the dissimilar material bonding of the glass and solder tried to be designed. The parameters and response was set through the basic experiment. The dissimilar material bonding strength analysis using the 60 [kHz] ultrasonic bonding equipment was done. We carried out the bonding for improving bonding strength to using the silver paste. air thightness of bonding surface was confirmed by analysis of bonding interfaces.