In the shipbuilding industry, the application of fiberglass composite laminate panels has increased in the decades. In the preliminary design stage, it is convenient to use simplified formulas to estimate the first natural frequency of a stiffened panel that can be compared with the recommended ones by the Germanischer Lloyd’s [3]. In this work, it is proposed a formula to performed this estimation considering panel features, aspect ratio and the number of stiffeners.

    The behavior of fiberglass stiffened panels was studied through Finite Element Analysis method considering 684 models where principal dimensions, aspect ratios, thicknesses, and stiffeners were combined. Based on these numerical results, a posynomial formula has been derived that allows estimating the natural frequencies of fiberglass stiffened panels. As a result of this investigation, a set of coefficients are proposed, which are only applicable within a range of aspect ratios. Some examples with different aspect ratios and dimensional variations of the panels and stiffeners are included to validate the proposed formula. The estimation error is in average 5% when compared to LR recommendation, that is considered acceptable in the preliminary design stage.


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    Title :

    Fiberglass Stiffened Panels: Estimation of Natural Vibration Frequency



    Conference:

    International Ship Design & Naval Engineering Congress ; 2019 ; Cartagena, Colombia March 13, 2019 - March 15, 2019
    Pan American Congress of Naval Engineering, Maritime Transport and Port Engineering ; 2019 ; Cartagena, Colombia
    March 13, 2019 - March 15, 2019



    Publication date :

    2020-03-11


    Size :

    13 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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