摘要
为了探究航空发动机失调叶盘结构的固有频率在不同随机参数下的分布规律,建立了叶盘结构的有限元模型,对各随机变量选取了不同的失调程度。利用拉丁超立方抽样与响应面相结合的方法,对不同结构参数、工况下的叶盘固有频率进行了概率分析,得到了其在不同失调情况下的分布特性以及对各输入参数的灵敏度。利用工程振动理论建立了结构共振失效的极限方程,给出了叶盘结构在随机频率的激振力下的抗共振可靠度的计算方法,并对不同材料属性参数失调程度下的叶盘抗共振可靠度进行了计算,得出了叶盘抗共振可靠度在不同程度的材料属性失调下的变化规律。
In order to explore the regularities of distribution of mistuned bladed disk assemblies with different random input parameters, finite element model of the bladed disk was built and different misalignment of each parameter was selected. By response surface method combined with Latin hypercube sampling method, probabilistic analysis about natural frequency of bladed disk with different material and working condition parameters was made. The natural frequency distribution and its sensitivity to each input parameter was obtained. Based on engineering vibration theory, a limit equation about structure resonance fatigue was established and a computational method of anti-response reliability of bladed disk under vibration force with different frequency was given. Simulation calculation with regard to anti-response reliability of mistuned bladed disk with distinct material parameters was made. The results indicate the anti-response reliability change regularity of bladed disk with different mistuned material parameters.
出处
《航空发动机》
2016年第3期48-53,共6页
Aeroengine
基金
国家自然基金(51375032)资助
关键词
失调叶盘
模态特性
有限元模型
概率分析
抗共振可靠度
航空发动机
mistuned bladed disk
modal characteristics
finite element model
probabilistic analysis
anti-resonance reliability
aeroengine