• 전기학회논문지
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• 제66권8호
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• pp.1285-1290
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• 2017

In this paper, we developed a core module of the steering system to control and operate the outboard ship with the automatic steering system, and implemented it as a complete integrated system. In particular, this paper presents the problem of the rudder sensor used in the existing system and implements the contactless rudder sensor as an improvement. In the case of existing rudder sensors, there is a problem that safety operation and economic loss of the ship operation is caused by malfunction due to immersion during use in outboard vessels. However, the proposed rudder sensor is separated from the rotary shaft to constitute a contactless type, and a circular magnet is fixed so that the rotating value can be detected and used by the Hall sensor to completely solve the flooding problem. As a result of the characteristic test, the voltage value from 1.8V to 3.2V was obtained between $-35^{\circ}$ and $+35^{\circ}$ degrees and satisfied the reference value. The proposed rudder sensor was mounted on the outboard ship, and all the performance of controller system were checked. According to the system proposed in this paper, it satisfies the Korean Standard Specification, which defines the speed of convergence in 30 seconds by switching from left to right in 7 seconds. We also confirmed that automatic steering was performed by comparing the compass sensor with the destination in the integrated controller at the start-up.

• Journal of Advanced Marine Engineering and Technology
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• 제17권4호
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• pp.38-48
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• 1993

A study on friction welding of stainless steel bar(SUS431) to chrome molybdenum steel bar(SCM21) was accomplished experimentally through analysis for relations among friction welding conditions, tension test, hardness test, microstructure test and acoustic emission test. The results obtained are summarized as follows ; 1. Through friction welding of SUS431 bar to SCM21 bar, the optimum welding condition by considering on strength and toughness was found to be the range of heating time of 3-5 sec when the number of rotating speed of 2000rpm, heating pressure of 10kg/$mm^2$, and upsetting time of 4 sec. 2. Quantitative ralationship was identified between heating time($T_1$, sec) and tensile strength (${\sigma},\;kgf/mm^2$) of the friction welded joint and the relation equation is $\sigma$=52.62$T_1{^{0.06}}$. 3. Through AE test, quantitative relationship was confirmed between heating time($T_1$, sec) and total AE(N, counts) during welding, and the relation is computed as follows ; N=30413.6$e^{0.06T1}$. 4. It was confirmed that the quantitative ralationship exists between the tensile strength of the welded joints and AE cumulative counts. And the relation is computed as the following ; ${\sigma}$=16.37(ln N)- 116.4. 5. When ONZ=36500-41500 counts by $OT_1Z$=3~5sec, it was identified by experiment that the range of welded joint tensile strength is 55.6-57.7kgf/$mm^2$/ whose joint efficiency is more than 100%, and it was experimentally confirmed that the real-time nondestructive quality(strength) evaluation for the friction welded joints could be possible by acoustic emission technique.

• 해양환경안전학회지
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• 제11권2호
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• pp.51-63
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• 2005

소형어선 검사제도와 관련하여 최근에 정부에서는 선박검사대상에 제외되었던 선외기등 총톤수 2톤 미만의 선박(이하 소형어선)에 대하여 선박안전법 적용대상으로 확대하여 어민들의 안정적인 조업활동을 지원하여야 한다는 근거하에 선박안전법 개정(제3조)에 관한 입법이 추진중에 있다. 소형어선의 검사여부 문제에 대해 어선의 안전확보 차원에서 검사를 해야 된다는 측면과 영세민과 노년층으로 현행 검사비 및 검사수수료의 비용 부담 및 어선검사를 받는데 소요되는 많은 시간 등의 문제로 종전과 같이 검사대상에서 제외되어야 한다고 주장하고 있다. 이러한 상반된 의견에 대한 대안으로 영세어민의 생업에 사용하거나 소형어선에 대한 검사는 원칙적으로 선박의 소유 또는 사용자가 자발적으로 수행하여야 하며 행정적인 규제는 이러한 목적 달성을 위한 최소한의 정책수단으로 제한되는 것이 바람직한 것으로 나타났다. 또한, 주요 수산국들 처럼 우리나라도 소형어선 검사를 위한 다양한 프로그램개발이 필요하다. 특히, 소형어선에 대한 검사를 실시하는 경우, 어선검사료 정부 지원, 최소한의 안전확보 검사, 어선건조시 검사, 검사기간을 연장하는 방안을 고려하여 정책을 추진할 필요가 있는 것으로 파악되었다.