Paper
16 August 2001 Use of active structural control for isolation
Betsy M. Marsh, David J. Warkentin, Mansour Ashtiani
Author Affiliations +
Abstract
Active structural control using the ACX QuickPack piezoelectric strain actuators has been proven to be an effective method for controlling vibration. However there are structures where the optimal strain actuator location is either inaccessible or undesirable. Under such circumstances, a solution can be an active isolation system where strain actuators are placed along the direct transmission path of the vibration. The feasibility of an active isolation system was demonstrated using a cantilevered beam with a tip mass. Vertical acceleration at the tip was used as the performance metric, and a force near the clamp as the disturbance source. Thin aluminum flexures sandwiched by QuickPack strain actuators were placed between the beam end and the mass to isolate the mass from the beam. A finite element model was built and a state-space representation derived for the transmissibility between disturbance and performance to optimize the flexures and actuators, as well as to predict performance. Once the system was built, transfer functions were taken and a PPF controller was implemented. The amount of vibration transmitted to the mass was reduced by 22 dB overall, with a 5 dB reduction due to the passive isolation effects, and 17 dB due to the active control.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Betsy M. Marsh, David J. Warkentin, and Mansour Ashtiani "Use of active structural control for isolation", Proc. SPIE 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems, (16 August 2001); https://doi.org/10.1117/12.436568
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CITATIONS
Cited by 4 scholarly publications.
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KEYWORDS
Optical isolators

Actuators

Control systems

Sensors

Active isolation

Feedback signals

Beam shaping

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