Development of an Ultralight with a Ducted Fan

Noise Source Identification for Ducted Fan Systems

Understanding combustion noise source mechanisms, designing efficient acoustic liners and optimising active control algorithms for noise reduction requires the identification of the frequency and modal content of the combustion noise contribution. Coherence-based noise source identification techniques have been developed which can be used to identify the contribution of combustion noise to near...

Comparison of Nonlinear Control Designs for a Ducted Fan Model

In this paper we compare diierent nonlinear control design methods by applying them to the planar model of a ducted fan engine. Those design can be divided into two steps. The rst step requires the derivation of a Control Lyapunov Function (CLF), while the second involves using an existing CLF to generate a controller. The main premise of this paper is that by combining the best of these two ph...

Development of a Dynamic Model of a Ducted Fan VTOL UAV

Linear Parameter-Varying Control of a Ducted Fan Engine

Parameter-dependent control techniques are applied to a thrust vectored ducted fan engine. The synthesis technique is based on the solution of Linear Matrix Inequalities and produces a controller which achieves speci ed performance against the worst-case time variation of measurable parameters entering the plant in a linear fractional manner. Thus the plant can have widely varying dynamics over...

Investigation of the Aerodynamic Characters of Ducted Fan System

This paper investigates the aerodynamic characters of a model ducted fan system, analyses the basic principle of the effect of thrust promotion and torque reduction, discovers the relationship between the revolutions per minute(RPM) of the fan and the characters of thrust, as well as system torque. Firstly a model ducted fan has been designed and manufactured according to the specific structure...