Abstract:
The use of lightweight, compact deployable systems for the large space structures (LSS) leads to the difficulties that they are very flexible and structural vibrations are easily excited due to disturbances in the space environment. Therefore vibration suppression in flexible long structures has been the focus of many studies in the present decade. Vibration causes high amplitude oscillation near their lower natural frequencies, this bad behavior can also be problematic in flexible space structures such as the supports for a solar array or the lightweight trusses used in the space station. Space structures do not need to support a high load in space hence loads are supported with light structure but in consequences loads are subject to damaging vibrations that persist due to the absence of an atmosphere or gravity to provide a damping effect. Active vibration control using smart materials could provide a reliable means to reduce this damaging vibration. This paper is aimed to develop an integrated controller design procedure for uncertainty rejection and performance optimization of different constraints such as disturbance rejection and actuator force. In this paper we have made model structure in a pendulum configuration with three blocks are fixed on light Aluminum strips. The top of the structure is clamped with steel frame and the bottom is free to oscillate in the plane. In the model 2 piezoceramics (PZT - Lead Zirconate Titanate) actuators pairs are fixed on the strips, this kind of material has piezoelectric properties, that is, applying a voltage gradient, it will have an output strain as result. As there is lot of constraints we have accommodated and obtained multiobjective function in the terms of Linear Matrix Inequalities(LMI) and problem is solved efficiently by convex .optimization. Different types of the vibration excitations are applied on the steel frames with/ without changing in real parameters of the model to accommodate the uncertainties, and observed its responses on hanged loads attached wit h the flexible structure with and without robust controller.
Page(s):
1-9
DOI:
DOI not available
Published:
Journal: Proceedings of 4th International Bhurban Conference on Applied Sciences and Technology, Volume: 0, Issue: , Year: 2005