【作者】 肖良丰； 周兰伟； 李向东；

【Author】 XIAO Liang-feng;ZHOU Lan-wei;LI Xiang-dong;School of Mechanical Engineering, Nanjing University of Science and Technology;

【机构】 南京理工大学机械工程学院；

【摘要】 为研究典型机翼遭受爆炸冲击波损伤变形后的结构动力学特性,本文采用有限元方法计算了不同质量的炸药在不同位置处爆炸对机翼的损伤,并分析了机翼变形程度与结构强度和模态的关系。研究表明:随着炸药质量的增加,机翼结构变形程度增加;机翼损伤变形后其前四阶模态固有频率都降底,其中二阶模态固有频率的下降幅度最大;损伤变形机翼的模态频率变化与炸点位置有关,当炸点位于机翼中心正上方时,损伤变形机翼的一阶和二阶模态频率下降幅度最大,降幅分别达到11.77%和15.02%;损伤变形机翼的最大等效应力和位移增量随着炸药质量的增加而增加。更多还原

【Abstract】 In order to study the structural dynamics characteristics of a typical wing after being damaged and deformed by an explosion shock wave, this paper uses the finite element method to calculate the damage to the wing caused by the explosion of explosives of different masses at different positions, and analyzes the degree of deformation and structural strength of the wing. Modal relationship. Studies have shown that: with the increase of explosive mass, the degree of deformation of the wing structure increases;after the wing is damaged and deformed, the natural frequencies of the first four modes are all lowered, and the natural frequency of the second mode decreases the most; the wing is damaged and deformed The change of modal frequency is related to the position of the explosion point. When the explosion point is directly above the center of the wing,the first-order and second-order modal frequencies of the damaged deformed wing have the largest drop, reaching 11.77% and 15.02% respectively; damage deformation The maximum equivalent stress and displacement increment of the wing increase with the increase of the explosive mass.更多还原