Intentional mistuning blade dry friction model for vibration localization of the bladed disk
Xuanen Kan, Kai Wang, Guoliang Ma
Abstract
To effectively mitigate excessive vibration levels in these systems, this study introduces a novel approach termed the Intentional Mistuning Blade Dry Friction (IMBDF) model. This model integrates intentional mistuning with dry friction to establish a coupled dynamic framework aimed at reducing vibrations in the blade-disk system. By leveraging both intentional mistuning and multi-contact dry friction , the model effectively controls localized vibrations while enhancing energy dissipation. Additionally, the proposed model addresses the issue of local vibration being highly sensitive to factors that disrupt structural symmetry. To begin, this study establishes a multi-contact surface model that considers the micro-morphological characteristics of the blade contact surfaces. This is followed by the development of a multi-contact surface dry friction model . The second step involves creating an intentional mistuning bladed disk dynamic model that takes into account dry friction . To overcome the sensitivity of local vibration in the calculation process, an approximate symplectic algorithm is developed to solve the dynamic equations of the intentional mistuning bladed disk system with dry friction . Finally, the effects of key parameters on the dynamic behaviors of the proposed coupled dynamic model are discussed.