Structural Modeling and Strength Analysis of the Pump Tower of LNG Carrier Based on Multi-Load Combined Action
The structure design of the connection between pump tower and the hull of liquefied natural gas(LNG)carrier is complex and the bearing mode is special.Studying the structural modeling and strength analysis of the ship's pump tower is of great significance in enhancing the safety of LNG carrier.A combined model of the hull and pump tower which incorporates spring units connecting the main structure and the base foundation of pump tower is presented,analyzes the characteristic and calculation method of the liquid sloshing motion,the inertia force,the ultra-low temperature loads in the LNG tank,and proposes the structural strength analysis method of LNG pump tower under the combined action of multiple loads.Taking a real LNG carrier as an example,the deformation and stress of the pump tower structure are calculated and obtained.On this basis,the sensitivity of key parameters such as the number of spring units,the rigidity coefficient and the initial reference temperature of the material is analyzed.The results demonstrate that the modeling and strength analysis method under the combined action of multiple loads can be well applied to the detailed implementation of the LNG carrier chapter in China classification society(CCS)rules and is applicable to practical vessel scenarios,and can provide references for the structure design and assessment of pump tower in LNG carrier.
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