Helicopter Flight Control by Individual Channel Design

[摘要] Using the multivariable analysis framework known as Individual Channel Design (ICD), the analysis and design of a flight control system for a typical single main rotor helicopter is presented. As the ICD approach is more in the spirit of classical control theory (analysis followed by design), first the helicopter system model is analysed in order to determine the structural characteristics that can facilitate or impede the subsequent control design. Aspects such as loop interaction and right half plane poles and zeros are analysed. Three flight regimes are studied: Forward flight at 80 and 30 knots, and hover. The models for these flight conditions are initially given in the form of linear state space representations. The structural problems associated to these models, which cannot be remedied by simple feedback, are easily removed by ICD techniques resulting in control systems which are compatible with Level 1 handling qualities requirements. Additionally, assessments are performed on the basis of linear higher-order models. Also, the 30 knots design is assessed along a range of different speeds (20 to 40 knots), in order to determine the possibilities to derive scheduling control systems using ICD.

[发布机构] University:University of Glasgow

[关键词] Electrical engineering, Aerospace engineering