A Study of Hull Stress Monitoring System considering Thermal Effect

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Shim, Chun-Sik;Kang, Joong-Kyoo;Heo, Joo-Ho

  • 발행 : 2008.03.31

초록

This paper presents hull stress monitoring system installed in LNGC damaged by a Typhoon Elongation/contraction of removed areas has been assessed in terms of possible residual stress that will take place in replaced blocks when the applied load is removed. The bending moment of a vessel changes actually in terms of loss of longitudinal members and the change of weight distribution in repair procedure. The change of bending moment affects mainly in hull stress of longitudinal members. Hull stress monitoring system was installed on upper deck to prove LNGC stable in the criteria to be less than 40MPa during the period of repair procedure. A temperature measuring system was also installed to exclude the additional stress due to thermal effect from the measured hull stress. As a result, the hull stress was modified with the data measured by the temperature measuring system. This hull stress considering thermal effect was used as a guide stress to check the safety of LNGC during the period of repair procedure.

키워드

Hull stress monitoring system;Thermal effect;Gap sensor;SUS

참고문헌

  1. Slaughter S. B., Cheung M. C., Sucharski. D., and Cowper B.(1997), 'State of the Art in Hull Monitoring System', SSC-401
  2. Lloyd(1991), 'Provisional Rules for the Classification of Hull Surveillance System', Lloyd's register of Shipping
  3. IMO(1994), 'Recommendations for the Fitting of Hull Stress Monitoring Systems', MSC/Circ., 646