In this paper we offer a general theory of rotorcraft trim. The theory is set in the context of control theory. It allows for completely arbitrary trim controls and trim settings for multi-rotor aircraft with tests to ensure that a system is trimmable. In addition, the theory allows for 'optimal trim' in which some variable is minimized or maximized rather than set to a specified value. The theory shows that sequential trim cannot work for free flight. The theory is not tied to any particular trim algorithm; hut, in this paper, it is exercised with periodic shooting to show how free-flying rotorcraft can be trimmed in a variety of ways (zero yaw, zero pitch, zero roll, minimum power, etc.) by use of the general theory. The paper also discusses applications to harmonic balance and auto-pilot trim techniques.
General Theory of Rotorcraft Trim
1996
35 pages
Report
No indication
English
Aerodynamics , Aircraft , Rotary wing aircraft , Trim(Aerodynamics) , Algorithms , Control , Optimization , Theory , Harmonics , Sequences , Balance , Control theory , Automatic pilots , Free flight , Reprints
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