摘要
在对某水下无约束航行体进行有限元静力分析的时候,由于无法限定结构的自由度而使刚度矩阵奇异,从而导致求解失败。为了解决这一问题,采用强迫约束法和准静态法(惯性释放)对此航行体进行了有限元静力对比计算,结果表明:用强迫约束法对水下航行体进行静力分析时,在施加强迫约束的部位出现了严重的应力集中现象,应力最大值为1.25×106Pa,应力集中使得整个结构的应力分布与实验数据相差较大,可认为计算结果错误;采用惯性释放法对其进行静力分析时,应力最大值为3.27×105Pa,整个结构的应力分布合理,与实验数据一致,计算结果正确。
The stiffness matrix would be singular when an unconstrained submerged vehicle was analyzed with finite elements method,so the analysis would fail.To solve this problem,forced-constraint and quasi-static（inertia relief） were used in this analysis.The results show that there have been serious stress concentration while using forced-constraint at its forced-constraint region,the maxstress is 1.25×106 Pa.The stress distribution was affected seriously by stress concentration throughout the structure,and it makes data have a larger difference between whole structure of the stress distribution and the experimental data,the result could be considered incorrect.When inertia relief was used in static analysis,the stress maximum is 3.27×105 Pa,the stress distribution throughout the structure is reasonable,and the results is correct and consistent with the experimental data.
出处
《火力与指挥控制》
CSCD
北大核心
2012年第1期138-140,147,共4页
Fire Control & Command Control
关键词
有限元
刚度矩阵
约束
惯性释放
水下航行体
finite elements
stiffness matrix
constraint
inertia relief
submerged vehicles
