This paper describes the development of an active isolation mat for cancelation of vibrations on sensitive devices with a mass of up to 500 gram. Vertical disturbing vibrations are attenuated actively while horizontal vibrations are damped passively. The dimensions of the investigated mat are 140 × 140 × 20 mm. The mat contains 5 dielectric elastomer stack actuators (DESA). The design and the optimization of active isolation mat are realized by ANSYS FEM software. The best performance shows a DESA with air cushion mounted on its circumference. Within the mounting encased air increases static and reduces dynamic stiffness. Experimental results show that vibrations with amplitudes up to 200 μm can be actively eliminated.
This paper describes the theoretical analysis for changing the stiffness in dielectric elastomer stack actuators (DESA) by
electric voltage and investigates the influence of the mounting of DESA. The theoretical calculations are validated by the
experimental measurements. The tuning of the stiffness by electrical voltage can be used for small adaptive absorbers to
attenuate varying resonance frequencies of a system for example caused by the temperature variations.
The best experimental results were reached for the structure with unbonded DESA between stiff plates. The resonance
frequency was shifted from 129 Hz to 108 Hz. Besides, the selective mounting of DESA is a promising approach for the
adaptive absorber applications.
A promising application for dielectric elastomer actuators (DEA) is the active vibration control in the low frequency
range (0 - 200 Hz). The active and passive properties of the actuator can be joined to eliminate the disturbances in the
whole frequency range. These actuators can be used for protection of lightweight sensible equipment like optic e. g.
components. This paper describes the dynamic modeling of dielectric elastomer actuators (DEA) and the design of
control algorithms for applications like active suspensions. The used least mean squares parametric estimation method
for dynamic modeling of DEA shows a good accordance with the real system. Moreover, the developed feedback
controller improves the isolation characteristics of passive dielectric elastomer.
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