System Identification for Large Flexible Spacecraft Using Accelerometers

A Flexible Object Oriented Spacecraft Operating System (FOS)

Design of Nonlinear Robust Controller and Observer for Control of a Flexible Spacecraft

Two robust nonlinear controllers along with a nonlinear observer have been developed in this study to control a 1D nonlinear flexible spacecraft. The first controller is based on dynamic inversion, while the second one is composed of dynamic inversion and µ-synthesis controllers. The extension of dynamic inversion approach to flexible spacecraft is impeded by the non-minimum phase characteristi...

A Practical Application of an On-orbit Instrumentation System for Model Verification of a Large Flexible Spacecraft

The model verification of large flexible spacecraft is a new field of experimentation that expands the envelope of instrumentation systems wilh heretofore unseen performance and environmental demands. This paper will describe the hardware and software implementation of an on-orbit instrumentation system to be flown on the International Space Station (ISS) for the purpose of gathering structural...

Active Vibration Suppression of a Nonlinear Flexible Spacecraft

In this article, the issue of attitude control and active vibration suppression of a nonlinear flexible spacecraft is assessed through piezoelectric patches as actuator and sensors. Two controller loops are applied: the inner loop, to make the panel vibration damped through piezoelectric patches; and the outer loop, to perform spacecraft maneuver using the reaction wheel acting on the hub. An o...

Vibration Control of Flexible Spacecraft Using Adaptive Controller

The aim is to develop vibration control of flexible spacecraft by adaptive controller. A case study will be carried out which simulates planar motion of flexible spacecraft as a coupled hybrid dynamics of rigid body motion and the flexible arm vibration. The notch filter and adaptive vibration controller, which updates filter and controller parameters continuously from the sensor measurement, a...