Design of a stability augmentation system for a helicopter using LQR control and ADS-33 handling qualities specifications

Kumar, Vijaya M and Sampath, Prasad and Suresh, S and Omkar, SN and Ganguli, Ranjan (2008) Design of a stability augmentation system for a helicopter using LQR control and ADS-33 handling qualities specifications. In: Aircraft Engineering and Aerospace Technology, 80 (2). pp. 111-123.

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Abstract

Purpose – This paper aims to present the design of a stability augmentation system (SAS) in the longitudinal and lateral axes for an unstable helicopter. Design/methodology/approach – The feedback controller is designed using linear quadratic regulator (LQR) control with full state feedback and LQR with output feedback approaches. SAS is designed to meet the handling qualities specification known as Aeronautical Design Standard (ADS-33E-PRF). A helicopter having a soft inplane four-bladed hingeless main rotor and a four-bladed tail rotor with conventional mechanical controls is used for the simulation studies. In the simulation studies, the helicopter is trimmed at hover, low speeds and forward speeds flight conditions. The performance of the helicopter SAS schemes are assessed with respect to the requirements of ADS-33E-PRF. Findings – The SAS in the longitudinal axis meets the requirement of the Level 1 handling quality specifications in hover and low speed as well as for forward speed flight conditions. The SAS in the lateral axis meets the requirement of the Level 2 handling quality specifications in both hover and low speed as well as for forward speed flight conditions. The requirements of the inter axis coupling is also met and shown for the coupled dynamics case. The SAS in lateral axis may require an additional control augmentation system or adaptive control to meet the Level 1 requirements. Originality/value – The study shows that the design of a SAS using LQR control algorithm with full state and output feedbacks can be used to meet ADS-33 handling quality specifications.

Item Type:	Journal Article
Publication:	Aircraft Engineering and Aerospace Technology
Publisher:	Emerald Group Publishing Limited
Additional Information:	Copyright of this article belongs to Emerald Group Publishing Limited.
Keywords:	Helicopters;Flight dynamics;Control systems.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	15 Jul 2008
Last Modified:	19 Sep 2010 04:47
URI:	http://eprints.iisc.ac.in/id/eprint/14983

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