摘要
对飞行器、车辆的整体结构进行安全性分析时,考虑惯性载荷的计算模型显然更符合实际情况。笔者从结构可靠性分析的基本理论出发,提出了考虑动荷系数时,空间框架结构强度可靠性分析的方法,推导了梁板结构安全余量、惯性力和位移对随机变量灵敏度的计算公式。通过编制相应程序,用泰勒展开随机有限元设计验算点法研究了某客车车身结构的可靠性。算例表明:考虑惯性载荷的作用后,车身结构的失效概率有所增大,安全性降低,惯性力的影响不能忽略。
A more practical calculation model is provided when considering inertia load for the study of the safety of aircraft and vehicle frame structure.Based on the fundamental principle of structural reliability and dynamic load coefficient（DLC）,a method for analyzing the reliability of strength of spatial frame structures is proposed and the mathematical expressions of the sensitivities of safety margin,inertia load and node displacement to every random variable are derived.A program is developed and the reliability index for a bus body is calculated by using the design check point means of Taylor series stochastic finite element method（SFEM）.The results of a numerical example indicate that when considering the action of inertia load,the failure probability of the bus body increases and its safety decreases.It shows that the effect of inertia loads must be considered.
出处
《机械科学与技术》
CSCD
北大核心
2010年第5期574-577,共4页
Mechanical Science and Technology for Aerospace Engineering
基金
中航一集团航空基金项目(2007ZA54001)资助
关键词
动荷系数
框架结构
可靠性
灵敏度
随机有限元
强度
dynamic load coefficient（DLC）
frame structures
reliability
sensitivity
stochastic finite element method（SFEM）
strength
