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Equivalent design pressure for ship plates subjected to moving slamming impact loads
Abstract When a ship navigates at sea, the slamming impact can generate significant load pulses which move up along the hull plating. The effect of the moving pressure has so far not been explicitly considered in the Rules and Regulations for the Classification of Ships. Based on a modal superposition method and the Lagrange equation, this paper derives analytical solutions to study the elastic dynamic responses of fully clamped rectangular plates under moving pressure impact loads. The spatial variation of the moving slamming impact pressure is simplified to three types of impact loads, i.e. a rectangular pulse, a linearly decaying pulse and an exponentially decaying pulse. The dynamic responses of fully clamped rectangular plates under the moving slamming impact pressure are calculated in order to investigate the influence of the load pulse shapes and moving speed on the plate structural behaviour. It is found that the structural response of the plate increases with the increase of the moving speed. The response of the plate subjected to a moving pressure impact load is smaller than the case when the plate is subjected to a spatially uniform distributed impact load with the same load amplitude and load duration. In order to quantify the effect of the moving speed on the dynamic load, a Dynamic Moving Load Coefficient (DMLC) is introduced as the ratio between the dynamic load factor for the moving impact load and that under the spatially uniform distributed impact load. An expression for DMLC is proposed based on analyses of various scenarios using the developed analytical model. Finally an empirical formula which transforms the moving impact loads to an equivalent static load is proposed.
Highlights This paper presents an analytical method for predicting the elastic behaviour of a fully clamped rectangular plate under moving slamming loads. A Dynamic Moving Load Coefficient (DMLC) is introduced to quantify the effect of the moving speed on the structural response. An empirical expression for DMLC is provided based on calculations of various cases using the derived analytical method. A new method is proposed to transform the moving impact load to an equivalent static load that produces the same deflection magnitude of the plate.
Equivalent design pressure for ship plates subjected to moving slamming impact loads
Abstract When a ship navigates at sea, the slamming impact can generate significant load pulses which move up along the hull plating. The effect of the moving pressure has so far not been explicitly considered in the Rules and Regulations for the Classification of Ships. Based on a modal superposition method and the Lagrange equation, this paper derives analytical solutions to study the elastic dynamic responses of fully clamped rectangular plates under moving pressure impact loads. The spatial variation of the moving slamming impact pressure is simplified to three types of impact loads, i.e. a rectangular pulse, a linearly decaying pulse and an exponentially decaying pulse. The dynamic responses of fully clamped rectangular plates under the moving slamming impact pressure are calculated in order to investigate the influence of the load pulse shapes and moving speed on the plate structural behaviour. It is found that the structural response of the plate increases with the increase of the moving speed. The response of the plate subjected to a moving pressure impact load is smaller than the case when the plate is subjected to a spatially uniform distributed impact load with the same load amplitude and load duration. In order to quantify the effect of the moving speed on the dynamic load, a Dynamic Moving Load Coefficient (DMLC) is introduced as the ratio between the dynamic load factor for the moving impact load and that under the spatially uniform distributed impact load. An expression for DMLC is proposed based on analyses of various scenarios using the developed analytical model. Finally an empirical formula which transforms the moving impact loads to an equivalent static load is proposed.
Highlights This paper presents an analytical method for predicting the elastic behaviour of a fully clamped rectangular plate under moving slamming loads. A Dynamic Moving Load Coefficient (DMLC) is introduced to quantify the effect of the moving speed on the structural response. An empirical expression for DMLC is provided based on calculations of various cases using the derived analytical method. A new method is proposed to transform the moving impact load to an equivalent static load that produces the same deflection magnitude of the plate.
Equivalent design pressure for ship plates subjected to moving slamming impact loads
Zhu, Ling (author) / Duan, Lele (author) / Chen, Mingsheng (author) / Yu, T.X. (author) / Pedersen, Preben Terndrup (author)
Marine Structures ; 71
2020-02-14
Article (Journal)
Electronic Resource
English
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