A Study on Stabilization of Underwater TAS Winch System Deploy/Recover Operation Performance

수중용 TAS윈치 전개/회수 성능 안정화 방안에 관한 연구

Abstract

This paper describes the stabilization of underwater TAS winch system Deploy/Recover operation performance. TAS winch installed on the stern of submarine performs to deploy/recover sensor, towing cable and rope tail which is deployed from the stern and separated from submarine itself. Also TAS winch provides transmission path of power to the sensor and data transmitting/receiving path which data are acquired from underwater environment like sound, depth and temperature. At the step of TAS winch evaluation test, sporadic standstill and rotating speed oscillation phenomenon were occurred. Winch motor provides the available torque to deploy/recover TAS and root cause analysis to the winch motor was done to find exact reason to sporadic malfunction. When winch motor was disassembled, eccentricity of rotor, slip-ring and the other composition part for winch motor were found. These might cause magnetic field distortion. To make TAS winch system more stable and block magnetic field distortion, this paper suggests methods to enhance fixing status installed in winch motor. For reliable data acquisition for TAS winch operation, the deploy/recover function of the improved type of TAS winch was verified in LBTS making similar condition with sea status. At the end of stage, improved type of TAS winch was tested on some functions not only deploy/recover function, but sustainability of TAS operation on specific velocity, steering angle of submarine in the sea trial. Improved type of TAS winch was verified in accordance with design requirement. Also, validity of suggested methods were verified by the sea trial.

본 논문은 수중용 TAS윈치 전개/회수 성능 안정화 방안에 대한 내용을 서술하고 있다. TAS윈치는 함미에 장착되어 자함과 이격되어 운용되는 센서, 예인케이블 및 꼬리로프의 전개/회수 기능을 수행하고, TAS에 대한 전원공급 경로, 수중환경 정보 및 수신된 음향신호 송/수신을 위한 데이터 전송 경로 제공 역할을 수행한다. TAS윈치 시험평가 과정에서 간헐적으로 TAS 전개 중 멈춤현상 및 회전속도 변동현상이 식별되었다. TAS 전개/회수에 필요한 토크를 제공하는 구성요소인 윈치모터에 대한 고장분석 결과, 구성품 중 회전자의 정렬 틀어짐으로 인한 편심현상에 따른 자기장 왜곡이 발생한 것을 확인하였다. 자기장 왜곡 발생 방지를 위해 윈치모터 회전자 및 슬립링 등 윈치모터 구성품의 고정성 향상 방안을 제안하였다. 제안된 방안에 대한 신뢰성 확보를 위해 LBTS 환경에서 TAS윈치 운용환경을 모사하여 TAS윈치 전개/회수 성능을 검증하였다. 최종적으로 TAS윈치 전개/회수 성능 뿐만 아니라 해상에서 TAS윈치를 운용할 경우 요구되는 함 속력 및 타각별 TAS 지속 운용능력과 같은 여러 가지 항목에 대한 해상 시험평가를 수행함으로써 설계 요구조건 만족 및 제안 방안에 대한 타당성을 검증하였다.

Fig. 1. Operational concept of TAS system

Fig. 2. Composition of TAS winch for outer part

Fig. 3. Interface of TAS winch for inner & outer parts

Fig. 4. Disassemble of stern casing of submarine

Fig. 5. The position and structure of winch motor

Fig. 6. Measuring back-EMF for winch motor

Fig. 7. Winch motor rotor/stator alignment check circuit

Fig. 8. The movement of washer installed in winch motor

Fig. 9. Structure of PMSM

Fig. 10. Dowel pin installation to prevent movement of rotor

Fig. 11. Installation position & number of dowel pin

Fig. 12. Installation position of fitting piece

Fig. 13. Cross-sectional diagram of resolver

Fig. 14. The result of FEM Analysis

Fig. 15. LBTS test environment for verifying winch motor speed control & deploy/recover function

Fig. 16. Result of winch motor deploy/recover function test

Fig. 17. Scenario for checking maneuverability(I)

Fig. 18. Sonar stave status obtained from TAS

Fig. 19. Environment data status obtained from TAS

Fig. 20. Scenario for checking maneuverability(II)

Table 1. Function of TAS winch for outboard equipment

Table 2. Causes of TAS winch malfunction

Table 3. Result of RCA(Root Cause Analysis)

Table 4. Measuring C/A on deploy/recover function test

Table 5. Sea trial evaluation result of TAS winc