Design of dry friction dampers for thin-walled structures by an accelerated dynamic Lagrange method. (22nd December 2020)

• Record Type: Journal Article
• Authors: Ma, H.Y.; Li, L.; Wu, Y.G.; Fan, Y.; Gao, Q.
• Is Part Of: Journal of sound and vibration. Volume 489(2020)
• Publication Date: 2020-12-22
• Subjects: Friction patch -- Thin-walled structures -- Dynamic Lagrange frequency-time(DLFT) method -- Optimization -- Experimental study; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2020.115550
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: The low inherent damping for thin-walled structures often leads to prominent vibrational problem. This paper proposes a friction patch to enhance the damping for thin-walled structures. The damping patch is simple in structure and easy to adjust the normal preload. Based on a beam finite element model, parameters including geometry, stiffness and position of the proposed damper are optimized numerically. The steady-state response of the system is calculated by the DLFT in the frequency domain efficiently with high accuracy. The damping performance of the friction patch is quantified by the resonant amplitude for the target mode. The design guidelines summarized from numerical simulation are experimentally verified through a cantilever beam. Four optimized friction patches are implemented to a complex industrial thin-walled structure. Results show that the well-designed friction patches provide over 40% vibration reduction with less than 0.83% additional mass of the host structure for different modes. Highlights: A new friction damper for thin-walled structures is proposed. The velocity-based DLFT is accelerated by providing the analytical Jacobian matrix. The damper has simple structure and is easy to adjust the normal preload. It provides over 40% vibration reduction with less than 0.83% additional mass.