Abstract
Taken into consideration of the effect of rotor downwash and shrouding duct, the Pitt-Peters' first harmonic non-uniform dynamic inflow model is extended to modeling the rotor/ducted fan propellant system. Combined with the data of wind tunnel experiment of assembled fan and duct fuselage, a practical nonlinear mathematical model of a full-scale rotor/ducted-fan helicopter is derived. The derived nonlinear model is linearized and the analysis of flight dynamics of the rotor/ducted-fan helicopter is conducted. The analysis results are compared with the flight dynamics of a conventional helicopter. It is indicated that the distinguishing features of the rotor/ducted-fan helicopter from the conventional helicopter are predominantly in the stability of lateral-directional motion modes at different flight speeds and the coupling characteristics of response to control inputs.
| Original language | English |
|---|---|
| Pages (from-to) | 144-149 |
| Number of pages | 6 |
| Journal | Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology |
| Volume | 41 |
| Issue number | 7 |
| State | Published - Jul 2009 |
Keywords
- Coaxial helicopter
- Coupling characteristics
- Ducted fan
- Dynamic inflow
- Motion modes
- Stability and control
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