Modal analysis of thin cylindrical shells with cardboard liners and estimation of loss factors

Körük, Hasan; Dreyer, Jason T.; Singh, Rajendra

doi:10.1016/j.ymssp.2013.10.026

Cited by 13 publications

(26 citation statements)

References 8 publications

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“…Koruk et al [1] recently examined the modes of a thin cylindrical shell containing a cardboard liner. This study developed controlled laboratory experiments to estimate the modal loss factors based on 2 measured vibratory and acoustic transfer functions, and also investigated the effect of liner thickness on the natural frequencies and loss factors.…”

Section: Introductionmentioning

confidence: 99%

“…There has been considerable interest in the use of cardboard and other liners for damping of shell vibration modes, driven by the need to reduce noise and vibration from drive shafts in the automotive industry [2][3][4][5]. Koruk et al [1] and Sun et al [5] both cite wide usage of cardboard, rolled paper, and other hybrid treatments such as tuned absorbers to dampen beam, torsional, and shell modes. However, much of the prior literature addresses the "design-of-experiment" type of study and most investigations use finite element analyses with empirical damping values; a more extensive literature survey of such publications is available from Koruk et al [1].…”

Section: Introductionmentioning

confidence: 99%

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A new analytical model for vibration of a cylindrical shell and cardboard liner with focus on interfacial distributed damping

Plattenburg

Dreyer

Singh

2016

Mechanical Systems and Signal Processing

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This paper proposes a new analytical model for a thin cylindrical shell that utilizes a homogeneous cardboard liner to increase modal damping. Such cardboard liners are frequently used as noise and vibration control devices for cylindrical shell-like structures in automotive drive shafts. However, most prior studies on such lined structures have only investigated the associated damping mechanisms in an empirical manner. Only finite element models and experimental methods have been previously used for characterization, whereas no analytical studies have addressed sliding friction interaction at the shell-liner interface. The proposed theory, as an extension of a prior experimental study, uses the Rayleigh-Ritz method and incorporates material structural damping along with frequencydependent viscous and Coulomb interfacial damping formulations for the shell-liner interaction. Experimental validation of the proposed model, using a thin cylindrical shell with three different cardboard liner thicknesses, is provided to validate the new model, and to characterize the damping parameters. Finally, the model is used to investigate the effect of the liner and the damping parameters on the modal attenuation of the shell vibration, in particular for the higher-order coupled shell modes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new analytical model for vibration of a cylindrical shell and cardboard liner with focus on interfacial distributed damping

Plattenburg

Dreyer

Singh

2016

Mechanical Systems and Signal Processing

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“…4 is separated into real and imaginary parts, which fit onto a line when plotted against ω 2 . The modal parameters are then estimated by determining the best lines that provide the best fits for the measured data (Kennedy 1947;Dobson 1987;Ewins 2000;ICATS 2009;Koruk and Sanliturk 2011a;Koruk et al 2014).…”

Section: Extraction Of Modal Parametersmentioning

confidence: 99%

“…Although the modal loss factors of the first modes of the bio-composite plates were a bit higher, the damping variation with respect to the frequency was low. A few potential reasons for the higher levels and larger variations for the damping of the first mode are the mass loading effect of the accelerometer, the adverse effect of the frequency resolution and the additional damping due to the air around the structure being more apparent at lower modes (ICATS 2009;Koruk and Sanliturk 2011a;Sanliturk and Koruk 2013;Koruk 2014b;Koruk et al 2014). Overall, the average loss factors of the Luffa-1, 2, and 3 bio-composite plates in the frequency range of interest were η = 2.62, 2.53, and 2.57%, respectively.…”

Section: Extraction Of Modal Parametersmentioning

confidence: 99%

Identification of the Dynamic Characteristics of Luffa Fiber Reinforced Bio-Composite Plates

Genc¹,

Körük²

2017

BioResources

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Luffa cylindrica plant fiber is a new biodegradable engineering material. However, the dynamic behaviors of these new green materials or their composites should be explored to consider them for practical applications. The dynamic characteristics including modal behavior and the elastic and sound isolation properties of luffa-based bio-composite plates were explored in this study. Structural frequency response function measurements were conducted using a few luffa bio-composite plates to identify their modal behavior. The modal frequencies and loss factors of the luffa bio-composite plates were identified by analyzing the frequency response function measurements using a few modal analysis methods such as half-power, circle-fit, and line-fit. The same luffa bio-composite structures were modelled using a finite element formulation with damping capability, and the elastic moduli of the composite plates were identified. In addition, the transmission loss levels of the same luffa composite samples were measured using the impedance tube method. The results showed that luffa composite structures have considerably high stiffness (elasticity modulus: 2.5 GPa), damping levels (loss factor: 2.6%), and transmission loss level (25 to 30 dB for a 1 cm thickness), and their mechanical properties are promising as an alternative disposable material for noise and vibration control engineering applications.

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“…The literature review clarifies that the number of publications concerning with experimental modal analysis of thin cylindrical shells are not as notable as those conducted on computational methods. Also, most of the related experimental investigations have been performed on isotropic cylindrical shells [23][24][25][26][27]. A few studies can be found dealing with experimental modal analysis of composite cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Experimental, numerical and analytical investigation of free vibrational behavior of GFRP-stiffened composite cylindrical shells

Hemmatnezhad

Rahimi

Tajik

et al. 2015

Composite Structures

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Modal analysis of thin cylindrical shells with cardboard liners and estimation of loss factors

Cited by 13 publications

References 8 publications

A new analytical model for vibration of a cylindrical shell and cardboard liner with focus on interfacial distributed damping

A new analytical model for vibration of a cylindrical shell and cardboard liner with focus on interfacial distributed damping

Identification of the Dynamic Characteristics of Luffa Fiber Reinforced Bio-Composite Plates

Experimental, numerical and analytical investigation of free vibrational behavior of GFRP-stiffened composite cylindrical shells

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