Journal of Aeronautics & Aerospace Engineering
Open Access

Development of continualized models for the analytical study of nano-plates in buckling and vibration: principles and perspectives

5^th International Conference and Exhibition on Mechanical & Aerospace Engineering

October 02-04, 2017 Las Vegas, USA

Florian Hache

Florida Atlantic University, Florida

Scientific Tracks Abstracts: J Aeronaut Aerospace Eng

Abstract :

Three adaptive approaches for a non-linear feedforward controller are combined with and sinusoidal trajectory planners in a spacecraft attitude control system. Physics-based feedforward control, trajectory generation, observers, feedback control, and system stability are discussed in relation to the nonlinear dynamics under simulation. The adaptive feedforward controllers compared include an adaptive controller, a Recursive Least Square (RLS) Method, and an Extended Least Squares (ELS) Method. A novel approach to incorporate ELS in adapting an idealized feedforward controller was developed and compared to the standard RLS optimal estimator. For a large slew maneuver, the controller configuration with ELS feedforward, PID feedback, and sinusoidal trajectory outperformed the baseline adaptive controller. Mean error was decreased by 23.4%, error standard deviation by 34.0%, and maximum error by 33.0%. Mean control effort was similar for all controller configurations. This improvement is due to corrections for miss-modeled dynamics, which occur during spacecraft launch, collisions with debris, or due to fuel slosh and loose components

Biography :

Florian Hache is pursuing 3rd year of his PhD at Florida Atlantic University (USA) and University of South Brittany (France). He works on the development of analytical models to describe the mechanical behavior of carbon nanotubes and graphene nano-plates in vibration.