多源不确定性条件下气动弹性系统颤振可靠性分析方法  

Flutter reliability analysis method of aeroelastic system under multi-source uncertainty

作　　者：郑宇宁 ZHENG Yuning(Key Lab of Space Physics,China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]中国运载火箭技术研究院,空间物理重点实验室,北京100076

出　　处：《振动与冲击》2021年第3期54-62,共9页Journal of Vibration and Shock

摘　　要：传统的气动弹性系统颤振分析模型大多是在确定性参数条件下建立的,当系统中存在不确定因素时,按确定性方法设计的气动弹性系统存在颤振失效风险。以概率和非概率区间模型为基础,建立了单源不确定性条件下颤振可靠性分析模型;在此基础上,针对含随机和区间多源不确定参数的气动弹性系统颤振可靠性分析问题,提出一种基于分步求解策略的新型混合可靠性分析与度量法,获取多源不确定性条件下气动弹性系统的颤振可靠度,实现了对多源不确定性条件下颤振可靠性的有效评估。数值算例表明,该方法与蒙特卡洛模拟法相吻合,且具有显著的计算效率优势。Traditional flutter analysis models of aeroelastic system are mostly established under the condition of deterministic parameters.When there are uncertainties in the system,the aeroelastic system designed with the deterministic method has a risk of flutter failure.Here,based on probabilistic and non-probabilistic interval models,a flutter reliability analysis model under the condition of single-source uncertainty was established.On this basis,a new hybrid reliability analysis and measurement method based on the step-by-step solving strategy was proposed for flutter reliability analysis of aeroelastic systems with random and interval multi-source uncertain parameters.The flutter reliability of aeroelastic system under the condition of multi-source uncertainty was obtained,and the effective evaluation of flutter reliability under the condition of multi-source uncertainty was realized.Numerical examples showed that the results obtained using the proposed method agree well with those obtained using Monte Carlo simulation method;the proposed method has a significant advantage of computational efficiency.

关 键 词：气动弹性系统 颤振 多源不确定性 可靠性 区间 

分 类 号：V215.3[航空宇航科学与技术—航空宇航推进理论与工程]