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

M. Vijaya Kumar (Rotary Wing Research and Design Centre, Hindustan Aeronautics Limited, Bangalore, India)
Prasad Sampath (Rotary Wing Research and Design Centre, Hindustan Aeronautics Limited, Bangalore, India)
S. Suresh (Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India)
S.N. Omkar (Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India)
Ranjan Ganguli (Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Publication date: 21 March 2008

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.

Keywords

Citation

Vijaya Kumar, M., Sampath, P., Suresh, S., Omkar, S. and Ganguli, R. (2008), "Design of a stability augmentation system for a helicopter using LQR control and ADS‐33 handling qualities specifications", Aircraft Engineering and Aerospace Technology, Vol. 80 No. 2, pp. 111-123. https://doi.org/10.1108/00022660810859337

Download as .RIS

Publisher

:

Emerald Group Publishing Limited

Copyright © 2008, Emerald Group Publishing Limited

Please note you might not have access to this content

You may be able to access this content by login via Shibboleth, Open Athens or with your Emerald account.
If you would like to contact us about accessing this content, click the button and fill out the form.
To rent this content from Deepdyve, please click the button.