The effect of varying stiffness in CH-47 rotor blades on Rotor Track and Balance

This work is a part of the Automated Rotor Blade Inspection (ARBI) project. ARBI aims to improve the rotorcraft RTB process with novel rotor blade measurement equipment. The objective of this research is to investigate how the variation in structural properties of the rotor blades composite structure affects the dynamical response during the RTB...

GOCE Spacecraft Attitude Control: A magnetic attitude controller simulator

Given the difficulty that is normally associated with tuning highly nonlinear control systems, such as seen in LEO spacecraft, it is interesting to evaluate how new controller types perform. The measured data from the GOCE mission has led to the creation of high fidelity torque models describing the angular perturbations acting on a spacecraft....

Fault-Tolerant Flight Control with Sensor-Based Nonlinear Dynamic Inversion

A worldwide civil aviation accident survey for the period of 2002 till 2011, conducted by the CAA-UK shows that in this time period nearly 40% of all the aircraft accidents involved loss of control. Despite the fatal outcomes, reconfigurable flight control might have been able to recover the aircraft by efficiently utilizing the remaining...

Robust flight control using incremental nonlinear dynamic inversion and angular acceleration prediction

This paper presents a flight control strategy based on nonlinear dynamic inversion. The approach presented, called incremental nonlinear dynamic inversion, uses properties of general mechanical systems and nonlinear dynamic inversion by feeding back angular accelerations. Theoretically, feedback of angular accelerations eliminates sensitivity to...