论文部分内容阅读
在参数化建模、求解的基础上重点研究了叶盘结构盘片耦合振动频率转向特性、由结构参数随机失谐引起的振动局部化特性对结构设计参数变化的敏感性.对盘片耦合振动频率转向特性的研究发现,随着轮盘扇区间耦合刚度或叶片刚度的变化,频率转向间隙曲线的改变具有碗状形式;对振动局部化特性的研究表明,以轮盘扇区间耦合刚度和结构参数失谐强度为自变量的失谐响应放大因子曲面呈类马鞍形;响应放大阈值现象存在与否,与轮盘扇区间耦合刚度的大小直接相关.若选择位于鞍部的轮盘扇区间耦合刚度-失谐强度组合参数设计,失谐响应放大因子最多能够被减小37.5%.
On the basis of parametric modeling and solving, this paper focuses on the frequency-steering characteristics of disc-coupled vibration of disc structure disc and the sensitivity of the vibration localization characteristics to structural design parameters caused by the random detuning of structural parameters. The research on the frequency steering characteristics shows that with the change of coupling stiffness or blade stiffness, the change of the frequency steering clearance curve has the shape of a bowl. The study on the vibration localization shows that the coupling stiffness and structure The parametric detuning strength is the detuning response of the independent variable. The enlargement factor surface is saddle-shaped. The existence of the response amplification threshold is directly related to the coupling stiffness between the sectors. If the coupling stiffness - Detuning strength combination of parameter design, detuning response amplification factor can be reduced by up to 37.5%.