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Design For Practice |
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Northern Arizona University |
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Constrained Layer Damping |
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Active constrained-layer damping for controlling resonant vibration by Azvine, Tomlinson, and Wynne in the Journal of Smart Materials and Structures. In their experiments using piezoelectric materials attached to metallic vibration damping tape they were able to achieve an 82% reduction in amplitude of the frequency of the vibrations. See Figure 1 for a diagram of their setup. The most ideal placement of the system located at the maximum deformation point on the beam. The increased damping effect is caused by the piezoceramic controlling the stress experienced in the viscoelastic material by changing its shape, which in turn forces the material to return to its unstressed shape. The cost of this solution varies based on the thickness of the tape. The 3M Vibration Damping Tape 436 Silver, 3 in x 36 yd 12.0 mil is $884 while the 3M Vibration Damping Tape 436 Silver, 8 in x 36 yd 12.0 mil costs $589 due to the selling of cases rather than a single unit. The piezoceramics have been found to cost under $20. This vibration dampening solution proves to be very capable, but the cost of the products could prove to be too expensive for practical use. |
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Setup for Constrained Layer Damping |
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Azvine, B, G R Tomlinson, and R J Wynne. “Use of active constrained-layer damping for controlling resonant vibration.” Smart materials structures 4.1 (1994): 1-6. Compendex. Web. 17 Nov. 2009. |