Length Optimization for Constrained Viscoelastic Layer Damping

Plunkett, R.; Lee, C. T.

doi:10.21236/ad0859392

Cited by 23 publications

(27 citation statements)

References 2 publications

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“…In the case of beams, υ is set to zero. Plunkett and Lee [17] have shown that the maximization of the loss factor for a constrained layer treatment requires a specific combination of parameters. That combination may be identified by differentiating the expression for the loss factor, Eq.…”

Section: Beams and Plates With Constrained Layer Dampingmentioning

confidence: 99%

Modifications to the Method of Modal Strain Energy for Improved Estimates of Loss Factors for Damped Structures

Torvik

Runyon

2007

Shock and Vibration

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The method of Modal Strain Energy (MSE) enables predictions of modal loss factors for vibrating systems from finite element analyses without evaluation of a complex-valued frequency response or a complex-valued frequency. While the method is simple, some error results; especially if the dissipative material has the high loss factor characteristic of materials added to increase system damping. Several methods for reducing this error through modifications to MSE have been suggested. In this work, the exact loss factor for a simple mechanical system is found. The method of Modal Strain Energy (MSE) is then used to find the loss factor for that prototype system and errors are evaluated in terms of system parameters. Comparisons are also made to predictions with several modifications to MSE. A modification due to Rongong is found to provide significant improvement. The use of this modification together with MSE is shown to lead to lower and upper bounds for the system loss factor. As the prototype system is shown to be mechanically equivalent to constrained layer damping configurations, the findings are applicable to the analysis and design of optimized sandwich beams, plates, and damping tapes. Results are given for beams and plates with constrained layer treatments.

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Section: Beams and Plates With Constrained Layer Dampingmentioning

confidence: 99%

Modifications to the Method of Modal Strain Energy for Improved Estimates of Loss Factors for Damped Structures

Torvik

Runyon

2007

Shock and Vibration

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“…11,34 Thus, further noise reduction by damping the warm bore wall was considered. Here the constrained damping treatment was applied on inner surface of the warm bore wall, as constrained damping treatment has obvious advantage than the free damping treatment on thin structure, 35 which has smaller bending stiffness compared with a thick one. Figure 9 shows the damping treatment installation on the warm bore wall with an enlarged view of a small section.…”

Section: B Spl Comparison Between Coil I and Coil Iimentioning

confidence: 99%

A numerical study of the acoustic radiation due to eddy current-cryostat interactions

Wang

Zhou

et al. 2017

Med. Phys.

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“…Such phenomenon is called edge effect. Plunkett and Lee [41] invented the concept of segmenting the constraining layer and derived an expression for optimum distance of equidistant cuts arrangements assuming pure extension of the treated structure. Trompette and Fatemi [42] determined an optimal distribution of cuts for maximum damping of a flexural sandwich beam with selected parameters.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless Analysis of Segmented Constrained Layer Damping Treatments with Modal Strain Energy Method

Tian

et al. 2016

Shock and Vibration

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Constrained layer damping treatments promise to be an effective method to control vibration in flexible structures. Cutting both the constraining layer and the viscoelastic layer, which leads to segmentation, increases the damping efficiency. However, this approach is not always effective. A parametric study was carried out using modal strain energy method to explore interaction between segmentation and design parameters, including geometry parameters and material properties. A finite element model capable of handling treatments with extremely thin viscoelastic layer was developed based on interlaminar continuous shear stress theories. Using the developed method, influence of placing cuts and change in design parameters on the shear strain field inside the viscoelastic layer was analyzed, since most design parameters act on the damping efficiency through their influence on the shear strain field. Furthermore, optimal cut arrangements were obtained by adopting a genetic algorithm. Subject to a weight limitation, symmetric and asymmetric configurations were compared. It was shown that symmetric configurations always presented higher damping. Segmentation was found to be suitable for treatments with relatively thin viscoelastic layer. Provided that optimal viscoelastic layer thickness was selected, placing cuts would only be applicable to treatments with low shear strain level inside the viscoelastic layer.

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Length Optimization for Constrained Viscoelastic Layer Damping

Cited by 23 publications

References 2 publications

Modifications to the Method of Modal Strain Energy for Improved Estimates of Loss Factors for Damped Structures

Modifications to the Method of Modal Strain Energy for Improved Estimates of Loss Factors for Damped Structures

A numerical study of the acoustic radiation due to eddy current-cryostat interactions

Dimensionless Analysis of Segmented Constrained Layer Damping Treatments with Modal Strain Energy Method

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