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Research Papers

Active Vibration Control of Beams By Combining Precompressed Layer Damping and ACLD Treatment: Theory and Experimental Implementation

[+] Author and Article Information
Sanjiv Kumar

Department of Mechanical Engineering, B.B.S.B.Engineering College, Fatehgarh Sahib, (Pb) 140407, Indiasanjivsharma2001@yahoo.com

Rakesh Sehgal

Department of Mechanical Engineering, NIT, Hamirpur, (HP) 177005, Indiarakeshsehgal.nitham@gmail.com

Rajiv Kumar1

Department of (I & P) Engineering, NIT, Jalandhar, (Pb) 144011, Indiarajivsharma1972@yahoo.com

1

Corresponding author.

J. Vib. Acoust 133(6), 061013 (Nov 28, 2011) (17 pages) doi:10.1115/1.4005028 History: Received September 18, 2009; Revised July 28, 2011; Accepted July 29, 2011; Published November 28, 2011; Online November 28, 2011

By attaching initially stressed poly vinyl chloride (PVC) layers on the flexible structures, necessary passive damping can be provided. Using passive constrained layers on these PVC layers, the efficiency can be made even better than ordinary passive constrained layer damping (PCLD) treatment. By using stressed PVC layers, a rich performance in case of circuit failure conditions is always available. An active constraining layer further enhances the damping performance of this passive technique. Precompressed layer damping treatment augmented with active constrained layer damping (ACLD) treatment has been suggested, which has many desirable features as compared to existing pretensed layer damping treatment. Such enhancement in damping performance is not possible by conventional ACLD as well as PCLD techniques. The effect of initial strain (compressive or tensile) and other parameters of the PVC layers on the vibration characteristics of flexible structure have been investigated. The Hamilton principle in conjunction with finite element method is used to derive the differential equations of motion. Using proportional feedback controllers, the complex closed loop eigenvalue problem is developed and solved numerically. The effectiveness of the proposed technique has been validated experimentally using a digital linear quadratic Gaussian controller.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematics of structure with ACLD combined with CoLD treatment

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Figure 2

Beam with ACLD treatment augmented with SLD treatment

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Figure 3

Constrained layer damping treated beam

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Figure 4

Comparison of loss factors by positive and negative strain to base beam (partial and full treatment)

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Figure 5

Comparison of natural frequencies by positive and negative strain to base beam (partial treatment)

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Figure 6

Comparison of loss factors by PCLD + CoLD and CoLD treatment (partial) at different location of the patch

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Figure 7

Comparison of natural frequencies by PCLD + CoLD and CoLD treatment (partial)

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Figure 8

Comparison of loss factors by PCLD + CoLD and CoLD treatment (partial) at other different location of the patch

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Figure 9

Comparison of loss factors by ACLD + CoLD and CoLD treatment (partial) at other different location of the patch

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Figure 10

Comparison of loss factors by ACLD + CoLD and PCLD + CoLD treatment (partial) at different location of the patch

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Figure 11

Schematics of the experimental setup (for identification)

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Figure 12

Photograph of the experimental setup

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Figure 13

Young’s modulus and shear modulus with corresponding loss factor as a function of frequency

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Figure 14

Comparison of experimental and theoretical vibration characteristics of the beam system using ACLD + CoLD treatment

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Figure 15

Time domain system response (simulations and experimental)

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Figure 16

Frequency domain system response (simulations and experimental)

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