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Research Papers

Hydraulically Amplified Terfenol-D Actuator for Adaptive Powertrain Mounts

[+] Author and Article Information
Suryarghya Chakrabarti

Smart Vehicle Concepts Center, Department of Mechanical and Aerospace Engineering,  The Ohio State University, Columbus, OH 43210chakrabarti.3@osu.edu

Marcelo J. Dapino1

Smart Vehicle Concepts Center, Department of Mechanical and Aerospace Engineering,  The Ohio State University, Columbus, OH 43210dapino.1@osu.edu

1

Corresponding author.

J. Vib. Acoust 133(6), 061015 (Nov 28, 2011) (9 pages) doi:10.1115/1.4004669 History: Received November 11, 2010; Revised April 13, 2011; Published November 28, 2011; Online November 28, 2011

A magnetostrictive actuator with a stroke of ±1 mm and a blocked force of ±25 N has been developed based on a Terfenol-D driver and a hydraulic stroke amplification mechanism. A mechanical model for this magneto-hydraulic actuator (MHA) is formulated by combining linear piezomagnetic relations for Terfenol-D and a lumped parameter mechanical system model describing the system vibrations. Friction at the fluid seals is described by the LuGre model. The model accurately describes the frequency-domain behavior of the actuator in mechanically-blocked and mechanically-free conditions. The MHA is benchmarked against a commercial electromagnetic driver used in active powertrain mounts in terms of mechanical performance (blocked force and unloaded displacement) and electrical power consumption. Measurements show that the MHA achieves more than twice the frequency bandwidth of the commercial device in the free displacement response, along with comparable static displacements. The commercial device produces higher blocked forces in the frequency range of 10 Hz to 120 Hz beyond which the generated forces are comparable up to 400 Hz. Spectral analysis reveals significant second order components in the commercial actuator displacement response which are absent in the MHA. Further, the MHA achieves superior performance than the commercial actuator operated at maximum current (6 A) with power consumption identical to that of the commercial actuator operated at minimum current (4 A).

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of the active mount model (Lee [3])

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Figure 2

Magnitude of transfer function Xd /X(s)

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Figure 3

Magnitude of load stiffness transfer function F/Xd (s)

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Figure 4

Normalized stroke ue /uref versus kinematic gain G

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Figure 5

Physical actuator (left) and cutout (right)

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Figure 6

Vibratory model for the magneto-hydraulic actuator

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Figure 7

Bode plot of transfer function driven-piston displacement over drive current, mechanically-free condition

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Figure 8

Bode plot of transfer function Terfenol-D strain over drive current, mechanically-free condition

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Figure 9

Bode plot of electrical impedance transfer function, mechanically-free condition

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Figure 10

Bode plot of transfer function blocked force over drive current, mechanically-blocked condition

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Figure 11

Bode plot of transfer function Terfenol-D strain over drive current, mechanically-blocked condition

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Figure 12

Bode plot of electrical impedance transfer function, mechanically blocked condition

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Figure 13

Experimental setup used for current-controlled actuator tests

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Figure 14

Displacement in mechanically-free condition with both devices driven at full power

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Figure 15

Displacement in mechanically-free condition with the CMA driven at reduced power in order to allow for excitation through the 100 Hz resonance without damaging it

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Figure 16

Free-displacement orders of (a) MHA and (b) CMA

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Figure 17

Measured force response in mechanically-blocked condition

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Figure 18

Blocked force orders of (a) MHA and (b) CMA

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Figure 19

Electrical Impedance of the MHA and CMA in blocked conditions

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Figure 20

Power consumption of the MHA and CMA

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