基于虚拟质量法的水下航行器燃料贮箱模态分析

摘要

To suppress the structural resonance of fuel tank of an undersea vehicle,a finite element model of the fuel tank is established based on the virtual mass method.Simulation is performed to calculate the modals of the fuel tank in dry state and filling state,and the natural frequencies and the vibration modes of the first four orders of breathing modal are extracted to investigate the influences of different bulkhead positions on the vibration characteristics of the tank structure.Hence,the relationship between the position of bulkhead and the model's maximum natural frequency is obtained.This research provides simulation data for structure design and performance improvement of the fuel tank.%为分析并解决水下航行器燃料贮箱结构共振问题,基于虚拟质量法建立了水下航行器燃料贮箱有限元模型,对燃料贮箱干状态、充液状态进行模态仿真计算,提取前4阶呼吸模态固有频率及振型,研究不同隔板位置对贮箱结构振动特性的影响,获得隔板位置与模型固有频率最大值的对应关系,为燃料贮箱结构设计、性能改进提供数值依据.