This paper describes the necessary developments for a hull strength assessment during the lifecycle of a ship using 3D models for hull condition recording (HC model) and for simulating hull strength (FE model). Beside appropriate assessment methodologies of aging structures an effective data exchange between the HC model and FE model is needed. The difficulty here lies in the different abstraction levels of the 3D models. The first steps for transferring actual inspection results stored in the HC model to the FE model as well as the derivation of structural assessment components like buckling fields are presented. The strength assessment of corroded hull structures is today based on a comparison of measured and required thickness values. In some cases, a longitudinal strength analysis is added. The latter is based on the computation of section moduli at the measured cross sections. Aditional steps are required for a re-analysis of the structural strength with the help of an FE model. Today, for many newbuildings such models are available. Moreover 3D technology can support the inspection and thickness measurement process. Based on this, it appears to be a natural step to combine these technologies for a more detailed analysis of remaining strength. Several problems need to be solved to efficiently carry out such a re-analysis. Two of these, namely the technology for a transfer of measured thickness values between the inspection model and the FE model and the determination of structural details for post-processing of the strength analysis have been described in this paper. A solution has been presented which can be regarded as a prerequisite for carrying out FE re-analysis in practice. Still several open issues remain. In particular, the procedure how to appropriately choose the thickness values (as complemented to the technology to actually transfer them) of the corroded elements in the FE model and in a post-processing analysis need to be defined.


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    Titel :

    Hull structure assessment for ships in operation


    Beteiligte:
    Wilken, Marc (Autor:in) / Eisen, Henner (Autor:in) / Krömer, Matthias (Autor:in) / Cabos, Christian (Autor:in)


    Erscheinungsdatum :

    2011


    Format / Umfang :

    15 Seiten, 10 Bilder, 9 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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