A general theory of rotorcraft trim

David A. Peters and Dinesh Barwey

Mathematical Problems in Engineering, 1996, vol. 2, 1-34

Abstract:

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; but, 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.

Date: 1996
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:232983

DOI: 10.1155/S1024123X9600021X

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