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음향블랙홀 파동 전달 특성을 이용한 굽힘진동 저감용 충돌 댐퍼
성연욱,정성영,양원석,박준홍 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.5
To mitigate noise radiation of home appliances in audio frequency ranges, viscoelastic damping materials with the constrained layer are widely used although their performance degrades after exposure to heat and moisture. In this study, the impact damper system incorporating acoustic blackhole structure is used to implement similar damping performance. The reflection coefficient for the proposed structure was evaluated by experimentation on the beam structure. For various beam configurations, we validated enhancement of impact damper performance when the acoustic blackhole structure was used in the beam structure. The performance was also predicted by numerical simulations for verification. The impact damper with acoustic blackhole beam showed effective damping performance in the wide frequency bands. The proposed damping system allows effective vibration and noise reduction without influence from heat exposures.
Semi-active Vibration Drug Delivery Device Design using a Micro-needle Fabrication and Array
성연욱,박진호,이혜진,Sung, Yeon-wook,Park, Jean Ho,Lee, Hye-Jin Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.1
Transdermal drug delivery device is a method of drug delivery through the skin. Skin has a very large area, so it is attractive route to drug delivery. When drug delivery through the skin, microneedle has a advantage that painless, constant drug deliver and penetration efficient; nevertheless the cost is expensive because fabrication process need a particular equipment and not suitable in mass production. This study shows microneedle fabrication process using convergence of general MEMS process and dicing process that can make 3-D sharp microneedle tip and this fabrication process suitable for mass production.
성연욱(Yeonuk Seong),김완승(Wanseung Kim),김종성(Jongseong Kim),박준홍(Junhong Park) 한국비파괴검사학회 2020 한국비파괴검사학회지 Vol.40 No.6
산업안전 이슈가 증가하면서 체결부의 볼트체결력에 대한 정밀한 측정방법 연구가 활발하다. 특히 수송 산업, 건축 산업 등에서 볼트부의 체결 상태를 측정하는 이슈가 점차 대두되고 있다. 축력을 측정하는 방법은 다양하지만 측정시간이 길고, 측정기구가 무거우며 사전 준비가 필요하다. 이 해결을 위해서는 기계의 자가진단을 통해 빠르고 정확한 측정이 포함되어야 한다. 이번 연구에서는 구조파를 볼트체결부에 인가하여 볼트 축력의 변화에 따라 구조파 특성을 관찰하고, 그 특성을 이용하여 축력을 자가 판정할 수 있는 시스템을 개발하였다. 축력이 변화함에 따라 구조파는 인가된 곳에서 더 빠르게 체결부위를 돌아 볼트부 반대편에 도달하였다. 이는 체결에 의한 변위가 구조파를 통해 나타나는 것을 나타낸다. 결과에 따르면, 딥러닝 알고리즘을 통해 구조파 신호를 학습데이터로 하여 자가 판단을 성공적으로 진행하였다. 이 기술을 바탕으로 체결부 측정에 관련한 산업에 기여를 할 것으로 기대된다. As industrial safety issues increase, much research is being conducted on precise measurement methods for the bolt clamping force. In particular, the estimation of the clamping force in bolts is important in the transportation and construction industries. There are various methods to measure the clamping force using an instrument that is heavy and requires special setup. However, to meet the requirements, fast and accurate measurement technology must be included through self-diagnosis of the machine. In this study, a structural vibration was applied to the bolt joint to observe its propagation characteristics according to the change in the bolt clamping force. The clamping force was determined using its characteristics. As the clamping force increases, the arrival time of the structure wave at the opposite location is reduced. This indicates that the structure wave is affected by the displacement caused by the clamping force. Self-determination was successfully carried out using the structure wave signal as the input learning data through the deep-learning algorithm. This technology is expected to contribute to the industry related to joint reliability assessment.
휴대용 전자단말기용 자동초점 구동 카메라 모듈의 충격 후 잔류 응력해석
성연욱(Yeon-wook Sung),이문구(Moon G. Lee),이지훈,이정재,박규섭(Kyu-sub Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user’s finger while he is talking on the phone. This paper studies a drop test of automatic focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension.