Computational and experimental studies of microvascular void features for passive-adaptation of structural panel dynamic properties

doi:10.1016/j.jsv.2017.09.024

Journal of Sound and Vibration

Volume 412, 6 January 2018, Pages 17-27

https://doi.org/10.1016/j.jsv.2017.09.024 Get rights and content

Abstract

The performance, integrity, and safety of built-up structural systems are critical to their effective employment in diverse engineering applications. In conflict with these goals, harmonic or random excitations of structural panels may promote large amplitude oscillations that are particularly harmful when excitation energies are concentrated around natural frequencies. This contributes to fatigue concerns, performance degradation, and failure. While studies have considered active or passive damping treatments that adapt material characteristics and configurations for structural control, it remains to be understood how vibration properties of structural panels may be tailored via internal material transitions. Motivated to fill this knowledge gap, this research explores an idea of adapting the static and dynamic material distribution of panels through embedded microvascular channels and strategically placed voids that permit the internal movement of fluids within the panels for structural dynamic control. Finite element model and experimental investigations probe how redistributing material in the form of microscale voids influences the global vibration modes and natural frequencies of structural panels. Through parameter studies, the relationships among void shape, number, size, and location are quantified towards their contribution to the changing structural dynamics. For the panel composition and boundary conditions considered in this report, the findings reveal that transferring material between strategically placed voids may result in eigenfrequency changes as great as 10.0, 5.0, and 7.4% for the first, second, and third modes, respectively.

Section snippets

Background and motivation

Harmonic or random excitations of structures can lead to large amplitude oscillations at the modes of vibration, which are significantly magnified when structures are driven around the natural frequencies. For aerospace structures, vibrations at resonance are particularly concerning. In turbine engines for instance, vibration response has been found to be magnified by 1000 times normal levels when driven at resonance [1]. For compressor blades of such turbines, it was found that oscillations at

Finite element model investigations

This section presents the finite element (FE) model investigations that are used to evaluate the ability of voids to tailor the vibration characteristics of structural panels. In all cases considered, the voids are positioned at the mid-plane of the panels. Void shape, number, size, and location are the parameters considered to be available for manipulation. Then, guidelines that enable changes in eigenfrequency via a material transition between voids are presented to direct experimental

Experimental validation

This section describes experimental efforts undertaken to validate the finite element model and explore opportunities for material transitions through internal voids to tailor the structural dynamics of panels. Following a description of fabrication methods for specimens considered, measurements taken with free-free and fixed-free panels are reported and discussed.

Conclusions

In this research, passive adaptation of structural panel dynamic properties is examined via the transmission of material in and out of voids at the mid-plane of the panel. From computational and experimental studies, it is found that, with respect to an unvoided panel, material voids in areas of higher modal displacement lead to an increase in eigenfrequency while material voids positioned in areas of higher stress correspond to a decrease in eigenfrequency. These effects are magnified using

Acknowledgements

The authors acknowledge helpful conversations about the motivations of this research with Dr. Jeff Baur of the Air Force Research Laboratory and Dr. Darren Hartl of the Texas A&M University. The authors also thank Dr. Jason Dreyer of The Ohio State University (OSU) for assistance during the impact hammer experiments. R.L.H. acknowledges start-up funds from the Department of Mechanical and Aerospace Engineering at The Ohio State University (OSU). N.C.S. acknowledges support from the OSU College

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Computational and experimental studies of microvascular void features for passive-adaptation of structural panel dynamic properties

Abstract

Section snippets

Background and motivation

Finite element model investigations

Experimental validation

Conclusions

Acknowledgements

Eng. Fail. Anal.

Eng. Fail. Anal.

Mech. Syst. Signal Process.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

Eng. Struct.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.

J. Sound Vib.