Perpustakaan Digital ITB

A method of improving the positioning accuracy of deployable space structures using vibrations was developed, and its effectiveness was demonstrated. The effects of vibration characteristics on improvements to shape repeatability were investigated via experiments and numerical simulations. An experimental model consisting of a beam, spring, and ball joint was developed, and it was used to simulate a portion of a deployable structure. Macro-fiber composite actuators were attached to the beam to generate vibrations. Experiments were conducted while changing the vibration characteristics, including the applied voltage for the actuator, the actuator position, and the frequency and duration. Positions of the beam, after applying vibrations, were measured using a laser displacement sensor, and the results were compared. A corresponding numerical simulation model was developed, and shape repeatability was investigated. The results indicated that the shape repeatability was improved by applying vibrations using an actuator at the natural frequency. The applied voltage had a large impact on shape repeatability, and the effective actuator position was investigated by considering the model force. © 2018 Elsevier Masson SAS. All rights reserved