수산해양교육연구 (Journal of Fisheries and Marine Sciences Education)
- 제9권2호
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- Pages.179-187
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- 1997
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- 1229-8999(pISSN)
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- 2288-2049(eISSN)
Doppler 효과(效果)에 의한 속도계측장치(速力計測裝置)의 정도(精度)에 관(關)한 연구(硏究) -Single beam Doppler log의 트림 변화에 따른 대지속력(對地速力) 오차(誤差)-
A Study on the accuracy of speed measuring system by the Doppler effect -The error of speed single beam Doppler log over the ground by various trim-
초록
경상대학교 해양과학대학 실습선 경양호 기관의 회전수와 추진기의 핏치각을 전속(全速)(R.P.M. 680, P.A.
Doppler log and current meter are based on the measurment of the doppler effect. Ship's speed over the ground measured by means of doppler log effect of underwater ultrasonic intends to get infulence by the difference of sound velocity, the ship's course, the sea bottom inclination, the trim and tranducer installation etc. This paper investigated on the error of speed over the ground by change of the trim comparing the real speed obtained by the mile post with the speed of single beam type doppler log on the trainning ship Kyeongyangho. The results are as follows ; 1. Indicating speed of doppler log is very much greatly influenced on variation of trim, but the real speed is less affected variation by trim. 2. The range of variation and error of speed over ground are smallest when ship's trim is 2.15m trim by the stern.
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