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제안 방법
- This paper introduces two-plane hull girder stress monitoring system to derive the true torsional moment according to the warping strain. In the suggested system, additional four LBSGs are located at a cross-section with a suitable distance from the cross-section of conventional system.
- Though detailed graphical notations for those components can be found in Choi and Kang(2003), more rigorous derivation for the torsional moments except bending components will be described in this paper to show the theoretical background of two- plane hull girder stress monitoring system. This paper will also provide the correction to the symbolic notation of warping function and the revised form of the relation between St. Venant strain and pure torsion이 moment.
- That is, the warping strain at an adjacent cross-section is required to obtain the torsional moment. To obtain this relation, this paper suggests two-plane measurement using the eight LBSGs.
이론/모형
- To verify the performance for estimation of warping component, a torsional moment was applied to the free-end of the model. The strain components were estimated by using finite element analysis and the proposed decomposition method was applied. The estimated torsional moment illustrates the same quantity as the applied torsional moment causing warping strain.
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