干摩擦阻尼对失谐叶盘系统受迫振动的影响

Effects of Dry Friction Damping on Forced Vibration Response of Mistuned Bladed Disk

针对目前含非线性干摩擦阻尼结构的失谐叶盘系统振动特性研究中,非线性干摩擦接触模型的建立及高自由度非线性系统的求解问题,采用抗混叠时频域融合算法和三维微滑移摩擦接触模型,对某含有非线性干摩擦阻尼结构的失谐叶盘系统的受迫振动响应进行计算分析,研究了干摩擦阻尼结构对失谐叶盘系统受迫振动响应的影响,并对含接触面非线性干摩擦失谐和叶盘系统失谐耦合作用下的双重失谐叶盘系统的振动特性进行了研究。结果表明:非线性摩擦阻尼结构对失谐叶盘系统的振动有抑制作用,在文中参数条件下振幅平均下降了9.53%;摩擦阻尼结构对失谐叶盘中每支叶片的减振效果存在差异,每支叶片达到最佳减振效果时所对应的最优初始正压力不同;接触产生的摩擦失谐对失谐叶盘系统同样有减振的作用;当接触面法向刚度失谐与叶盘系统的失谐强度和失谐量分布相同时,摩擦阻尼减振作用比摩擦力协调时减弱,在文中参数条件下振幅平均下降量减少了3.45%。

In the existing vibration characteristics research of mistuned bladed disk system with nonlinear dry friction damping structures,we have to encounter establishment of nonlinear friction contact model and solution of high degree of freedom nonlinear systems.Here the antialiasing hybrid frequency-time domain method and three-dimensional microslip friction contact model are chosen to evaluate the forced vibration response of a mistuned bladed disk with dry friction damping structure.The friction damping effect on forced vibration response of mistuned bladed disk,and the vibration characteristics of mistuned bladed disk under the condition of friction mistuned are investigated.It is found that the nonlinear friction vibration damping structure enables to inhibit vibration of mistuned bladed disk system with a 9.53% average amplitude decrease.The friction damping effect on each blade is different,and the corresponding optimal initial normal load of each blade reaching the optimal damping effect is not identical too.The normal contact stiffness mistuning and initial normal load mistuning also have the damping effect on the mistuned bladed disk.When the mistuned strength and mistuned distribution of the normal contact stiffness mistuning are the same as those of mistuned bladed disk,the friction damping effect attenuates in comparison with the situation of friction tuned,and the average decline of vibration amplitude reduces by 3.45%.