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Two Degree-of-Freedom Parallel Mechanisms for High Bandwidth Vibration Suppression and Tracking

Carruthers, Dustin J.
O'Brien, John F.
Abstract
Description
Limited degree-of-freedom (DOF) parallel kinematic mechanisms (PKM) are capable of high bandwidth tracking and disturbance rejection with smaller actuators than are required for serial machines. A high performance Nyquist-stable (NS) controller with nonlinear dynamic compensation (NDC) applied to a new PKM is presented. The Popov criterion is used to show absolute stability (AS) of the closed loop system and experimental evidence of closed loop performance is provided. This novel approach to PKM control provides 38 dB of disturbance rejection below 10 Hz, an order of magnitude more than what is achieved by implementing an absolutely stable fixed gain (ASFG) controller.
Date
2011-04-27
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Publisher
University of Wyoming. Libraries
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Keywords
parallel kinematic mechanism , vibration suppression , disturbance rejection , nonlinear dynamic compensation , Nyquist stable , absolute stability , Popov criterion
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