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Abstract

Effective piezoelectric sensitivity of bimorph strip actuators was enhanced by negative structural stiffness. Negative stiffness was achieved in brass strips post-buckled in compression to an “S” shape; the brass strip was placed in series with the bimorph. The negative stiffness was tuned by adjusting the brass strip length. The effective piezoelectric sensitivity in units of displacement per volt input increased as the inverse of the overall stiffness of the series element. The maximum observed enhancement in effective piezoelectric sensitivity was at least a factor of 6 at 1 Hz in comparison with the value when no negative stiffness was used. This corresponds to a maximum effective sensitivity of about 36 µm/V in comparison with the baseline effective sensitivity of about 6.1 µm/V at 1 Hz. The value is several orders of magnitude (almost 40,000 times) higher than the typical value of sensitivity for the material comprising the individual bimorph strip actuator.

Keywords

piezoelectric negative stiffness enhancement sensitivity

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References

Bazant

Cedolin

(1991) Stability of Structures. Oxford: Oxford University Press.

Bos

Janssen

Kauba

. (2008) Active vibration reduction applied to the compressor of an air-conditioning unit for trams. Journal of the Acoustical Society of America 123(5): 3873.

Dong

Lakes

(2013) Advanced damper with high stiffness and high hysteresis damping based on negative structural stiffness. International Journal of Solids and Structures 50: 2413–2423.

Dong

Stone

Lakes

(2012a) Advanced damper with negative structural stiffness elements. Smart Materials and Structures 21: 07502.

Dong

Stone

Lakes

(2012b) Enhanced dielectric and piezoelectric properties in xBaZrO₃- (1-x)BaTiO₃ ceramics. Journal of Applied Physics 111: 084107.

Falangas

Dworak

Koshigoe

. (1994) Controlling plate vibrations using piezoelectric actuators. IEEE Control Systems Magazine 14(4): 34–41.

Kalathur

Lakes

(2013) Column dampers with negative stiffness: high damping at small amplitude. Smart Materials and Structures 22(8): 084013.

Lakes

(2001) Extreme damping in compliant composites with a negative stiffness phase. Philosophical Magazine Letters 81(2): 95–100.

Lakes

(2014) Piezoelectric composite lattices with high sensitivity. Philosophical Magazine Letters 94(1): 37–44.

10.

Newnham

Skinner

Cross

(1978) Connectivity and piezoelectric-pyroelectric composites. Materials Research Bulletin 13: 525–536.

11.

Nye

(1976) Physical Properties of Crystals. Oxford: Oxford University Press.

12.

Rodriguez

Kalathur

Lakes

(2014) A sensitive piezoelectric composite lattice: experiment. Physica Status Solidi 251(2): 349–353.

13.

Smith

(1991) Optimizing electromechanical coupling in piezocomposites using polymers with negative Poisson’s ratio. In Proceedings of the IEEE ultrasonics symposium, vol. 1, pp. 661–666. New York: IEEE.

14.

Wang

Chan

. (2010) Enhanced ferroelectric and piezoelectric properties in doped lead-free (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ thin films. Applied Physics Letters 97(21): 212901-1–212901-3.

15.

Wang

Liu

(2008) Piezoelectric properties of low-temperature sintered Li-modified (Na, K)NbO₃ lead-free ceramics. Applied Physics Letters 93(9): 092904-1–092904-3.

16.

Wang

Lakes

(2001) Extreme thermal expansion, piezoelectricity, and other coupled field properties in composites with a negative stiffness phase. Journal of Applied Physics 90: 6458–6465.

17.

Shih

(2002) Effect of length, width, and mode on the mass detection sensitivity of piezoelectric unimorph cantilevers. Journal of Applied Physics 91(3): 1680–1686.

Enhancement in piezoelectric sensitivity via negative structural stiffness

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