Piezoelectric control of flexible vibrations in rotating beams: An experimental study

摘要

Abstract Active control of flexible vibrations by distributed piezoelectric actuators and sensors plays an increasing role in engineering, especially in light‐weight structures. Exemplarily, in this contribution a rotating beam is studied which can be found in many practical applications, e.g. as robot arms or flexible manipulators in production processes. It has been intensively shown in the literature that it is possible to completely suppress the flexible vibrations by an appropriate distribution of piezoelectric actuation strains. In order to compensate the inertial forces in the considered rotating beam, a complex distribution is obtained, such that a practical realisation would be very extensive. To overcome the problem, a discrete approximation by piezoelectric patches is applied. In order to find an optimal configuration for an experimental setup, and to investigate several control strategies, a numerical simulation model has been implemented based on Bernoulli‐Euler beam theory. The numerical results are verified by an experimental set‐up, in which 48 piezoelectric patches have been attached on a beam with rectangular hollow cross‐section. Each patch can be used either as an actuator or a sensor. Additionally, strain gauges can be used as sensors. For monitoring, acceleration sensors are used. The control system is implemented within a dSpace environment. The results show a significant reduction of the flexible vibrations. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)