A computational study of vibration delocalization in cyclic structures using adaptive stiffness elements

Andres M. Rodriguez; Jeffrey L. Kauffman

doi:10.1117/12.2514395

21 March 2019 A computational study of vibration delocalization in cyclic structures using adaptive stiffness elements

Andres M. Rodriguez, Jeffrey L. Kauffman

Proceedings Volume 10967, Active and Passive Smart Structures and Integrated Systems XIII; 109671J (2019) https://doi.org/10.1117/12.2514395
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

This paper investigates potential approaches to delocalize the vibration that result from mistuning in certain cyclic structures. To achieve this delocalization, this paper analyzes a cyclic structure with embedded, adaptive stiffness elements. Cyclic structures are ideally built using identical subsection, mistuning refers to the frequent occurrence that subsections contain some deviations from nominal design parameters. These deviations between otherwise identical subsections can generate localized vibrations. This paper examines using the adaptive structure to achieve different stiffness configurations with the goal of: (1) retuning the structure or (2) decreasing the amplitude of vibration of the localized mode(s). Using a new analysis method developed to identify localized modes of vibration on mistuned cyclic structures, this paper considers a low-order model of a turbine engine blisk with attached adaptive elements. Two method are consider to show the possibility of delocalization. The first method changes the stiffness configuration of the system so that all subsections resonate at the identical frequency. The second method uses a minimization procedure developed to identify the stiffness configurations that minimizes the potential for confined modes of vibration. A mistuned system containing two localized modes was used to test out the delocalization capabilities of each method. Both methods were capable of delocalizing this mistuned system, with method one faring better than method two. Results not only show delocalization, but also that mistuned mode shapes can be distorted back to those of the tuned system.

Conference Presentation

Citation Download Citation

Andres M. Rodriguez and Jeffrey L. Kauffman "A computational study of vibration delocalization in cyclic structures using adaptive stiffness elements", Proc. SPIE 10967, Active and Passive Smart Structures and Integrated Systems XIII, 109671J (21 March 2019); https://doi.org/10.1117/12.2514395

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