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비행환경 감지 기능을 보유한 ESAD 개발 및 기능 확인을 위한 슬레드 시험 방안
조한성,Hanseong Jo 한국군사과학기술학회 2023 한국군사과학기술학회지 Vol.26 No.3
Recently electronic safety and arming device(ESAD) has attracted increasing attention due to its design flexibility. However, ESAD can be armed unintentionally due to a malfunction of an external device or interface. Thus ESAD needs an internally generated arming signal independent from the external device. In this paper, a new sensor-hybrid ESAD(SHESAD) with a flight environment sensing function for generating arming signal internally is proposed and a sled test based method is also suggested for evaluating its functions. Through the test results, the operability of the flight environment sensing function was confirmed. Also, it is shown that the proposed test method is suitable for verification of ESAD with the flight environment sensing function.
고충격 가속도센서용 고분자 기반 기계식 저역통과필터의 성능 예측
송세환,장준용,이유림,조한성,윤상희,Sehwan Song,Junyong Jang,Youlim Lee,Hanseong Jo,Sang-Hee Yoon 한국군사과학기술학회 2023 한국군사과학기술학회지 Vol.26 No.3
A polymer-based mechanical low-pass filter(m-LPF) for high-g accelerometers makes it possible to remove high-frequency transient noises from acceleration signals, thus ensuring repeatable and reliable measurement on high-g acceleration. We establish a prediction model for performance of m-LPF by combining a fundamental vibration model with the fractional derivative standard linear solid(FD SLS) model describing the storage modulus and loss modulus of polymers. Here, the FD SLS model is modified to consider the effect of m-LPF shape factor (i.e., thickness) on storage modulus and loss modulus. The prediction accuracy is verified by comparing the displacement transmissibility(or cut-off frequency) estimated using our model with that measured from 3 kinds of polymers(polysulfide rubber(PSR), silicone rubber(SR), and polydimethylsiloxane(PDMS)). Our findings will contribute a significant growth of m-LPF for high-g accelerometers.
진동 유체 기반 실린더 기판 딥코팅을 통한 균일 두께 필름의제조 방법
이정락(Jeongrak Lee),곽현수(Hyunsu Kwak),조한성(Hanseong Jo),송유성(Yuseong Song),이안나(Anna Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We study the fabrication of uniformly thick films on cylinders by dip-coating with oscillation. In conventional dip-coating, whose physics was first investigated by Landau, Levich, and Derjaguin, a fast process generates a coating thickness gradient while a slow process limits the film thickness and is time-consuming. A new coating method of thick films was recently proposed, which involves dipping a solid substrate in a bi-layer liquid bath with neutral buoyancy and applying oscillation. In this study, we first experimentally and theoretically find how the film thickness profile is determined in the uniaxial coating. Then, we find the condition to achieve uniform thickness distribution along the circumferential direction in the biaxial coating. Applications of our results are not limited to areas where coating is widely used, such as solar cells or flexible displays; it can be used in the medical industry for efficiently fabricating functional catheters and vascular replicas.