선형시험수조에서의 자항식기만기 풀림장치 전개시험

Abstract

An Acoustic Counter Measure (ACM) is an active defence system of a submarine, which alleviate possibility of being detected by a torpedo. The ACM tows a hydrophone behind for the collection of information on combat situation. A hydrophone, a towing cable, and a cable stabilizer should be deployed after an ACM launched out of a submarine. Therefore, a releaser system to deploy towed objects is generally used. For the safety of own submarine, movement of a releaser after being deployed should be considered in the releaser system design, in order for a releaser not to collide with a submarine’s outer surface. The main objective of this research activity is to predict the action of a releaser system of a self-propulsive ACM after being deployed. In order to predict action of a releaser system in real ACM firing situation, test apparatus was designed and a releaser deploy test was conducted in the towing tank of Maritime & Ocean Engineering Research Institute / KORDI. To capture actions of the releaser and towed objects, four underwater CAM were used. 1:1 scale model of ACM was used for the test. Test result shows that in all towing speeds, there are no problem in releaser deploying and evacuation of hydrophone and stabilizer. The cable towed by ACM shows helical movement in initial state of towing. In all towing speeds, the releaser falls with constant speed after deployed. Therefore, the movement of releaser after deployed can be modelled as free-fall-in-water action. It is expected that the designed test would be used for designing a releaser system of underwater weapon systems. Furthermore, in order to roughly estimate dynamic behaviour of a releaser system, a releaser system’s moving distance and total elapsed time for the full expansion of the main wing after being deployed were predicted using the Computational Fluid Dynamics (CFD) software STAR-CD.