Reduced-Order Modeling of Mistuned Bladed Disks in Contact with Dry Friction Ring Dampers

Turbomachinery;Mistuning;Friction damping;Reduced-order modeling;Structural dynamics;Mechanical Engineering;Engineering;Mechanical Engineering

Tang, WeihanWang, Kon-Well ;

University of Michigan

关键词: Turbomachinery;    Mistuning;    Friction damping;    Reduced-order modeling;    Structural dynamics;    Mechanical Engineering;    Engineering;    Mechanical Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/137043/weihant_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Bladed disks (blisks) used in turbomachinery applications frequently operate under severe forcing conditions, which can lead to high levels of dynamics responses and pre-mature high cycle fatigue (HCF). Small blade-to-blade variations in structural properties, referred to as mistuning, result in strain energy localization, drastically amplifying blisk forced responses, and accelerate HCF. To quantitatively capture the effect of mistuning, it is necessary to develop efficient computational methods to predict the free and forced responses of blisks with various types of mistuning patterns. Due to the high geometric complexity of commercial blisks, full-order finite element (FE) blisk models contain many degrees of freedom (DOFs). Direct structural analyses with such FE models are computationally cumbersome or practically infeasible. Moreover, to prevent blisks from reaching HCF, frictional damping sources are introduced to dissipate vibrational energy and reduce the level of forced responses. Frictional damping is nonlinear in nature, and adds complexity into the blisk systems. Thus, robust and accurate reduced-order models must be developed to predict fast the dynamic responses of blisks with various mistuning and frictional damping sources. The main objective of this study is to develop a framework that involves several novel reduced-order modeling techniques. This framework is capable of efficiently and accurately capturing linear and nonlinear dynamic responses of blisks with small blade material variations, large changes in blisk mass, stiffness, and geometry, and dry friction ring dampers. Moreover, this framework serves as a powerful tool in designing friction dampers with optimal design parameters.