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为分析大型LNG低温储罐的振动特性,根据实际工程情况分为空罐和满罐两种工况,利用ANSYS软件对处于空罐和满罐两种状态下的储罐分别进行了合理建模和模态分析。从理论分析出发,考虑了流固耦合问题,较为精确地分析了两种工况下的储罐的自振特性。结果表明:液体的存在使得储罐的固有频率降低;在满罐情况下,液体对于低阶频率的影响大于对高阶频率的影响。为储罐的安全使用提供了可靠的依据,并为进一步的动力响应分析打下了基础。
In order to analyze the vibration characteristics of a large LNG cryogenic storage tank, two working conditions of empty tank and full tank are divided according to the actual project conditions. The tanks in the two states of empty tank and full tank are respectively modeled by ANSYS software And modal analysis. Starting from the theoretical analysis, the fluid-solid coupling problem is considered, and the natural vibration characteristics of the storage tank under two conditions are analyzed with more accuracy. The results show that the existence of liquid reduces the natural frequency of the tank. In the full tank, the influence of the liquid on the low-order frequency is greater than that on the higher-order frequency. It provides a reliable basis for the safe use of storage tanks and lays the foundation for further dynamic response analysis.