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CRI와 COLREG를 이용한 선박 충돌 회피 알고리즘
서찬희(Chanhee Seo),노유정(Yoojeong Noh),미쓰가나 아베베 바예(Misganaw Abebe Baye) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In recent years, unmanned shipping of ships has continued to evolve and has come to be considered commercially viable. Path planning is an important process for unmanned operations. However, there are many variables at sea. And they should be considered when routing for economy and safety. This study aims to ensure the economics and safety of ships ’operation by adding collision avoidance algorithm to an improved A<SUP>*</SUP> algorithm, a ships’ route finding optimization algorithm considering the economics of operations. For this, the algorithm is constrained by applying the Collision Risk Index (CRI) and COLREGs rule to the path optimization algorithm. To validate the proposed algorithm, The collision avoidance algorithm was performed in various maritime traffic scenarios, and the results of using CRI were compared to those using other ship domain methods.
유한요소법과 모드중첩법을 이용한 하드디스크 드라이브의 회전 디스크-스핀들 시스템에 대한 강제 진동 해석
서찬희(Chanhee Seo),장건희(Gunhee Jang),이호성(Hosung Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper presents a method to analyze the forced vibration of a rotating disk-spindle system in a HDD with fluid dynamic bearings (FDBs) and complicated base structure by using FEM and mode superposition. The validity of the proposed method is verified by comparing the simulated time and frequency responses with the experimental results. When the base plate is excited, it shows that pure disk modes cannot be excited and that rocking modes can be damped out due to the sufficient damping effect of FDBs.
지지구조와 헤드-서스펜션-액추에이터의 유연성을 고려한 HDD 유연 회전 디스크-스핀들 시스템의 유한 요소 고유 진동 해석
서찬희(Seo, Chan-Hee),이호성(Lee, Ho-Sung),장건희(Jang, Gun-Hee) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.1
This paper presents a finite element method to analyze the free vibration of a flexible HDD composed of the spinning disk-spindle system with fluid dynamic bearings(FDBs), the head-suspension-actuator with pivot bearings, and the base plate with complicated geometry. Experimental modal testing shows that the proposed method well predicts the vibration characteristics of a HDD. This research also shows that even the vibration motion of the spinning disk corresponding to half-speed whirl and the pure disk mode are transferred to a head-suspension-actuator and base plate through the air bearing and the pivot bearing consecutively. The proposed method can be effectively extended to investigate the forced vibration of a HDD and to design a robust HDD against shock.