A methodology to assess robust stability and robust performance of automatic flight control systems

Abstract

RESUMOUma metodologia para avaliar a estabilidade e o desempenho robustos de sistemas automáticos de comando de voo Esse artigo apresenta uma metodologia para avaliar a estabilidade robusta e o desempenho robusto de sistemas automáticos de comando de vôo. A ferramenta matemática utilizada na metodologia proposta é o valor singular estruturado, µ. Para fins de comparação, o artigo utiliza uma metodologia largamente utilizada na indústria aeronáutica para mensurar as características mencionadas. Os problemas dessa metodologia são discutidos e é mostrado que o método proposto é uma elegante alternativa para contornar as desvantagens do método industrial. Um procedimento passo a passo é apresentado, incorporando as vantagens da abordagem atualmente utilizada na indústria e eliminando suas fraquezas.Artigo submetido em 09/11/ABSTRACT This article presents a methodology to assess the robust stability and the robust performance of automatic flight control systems (AFCS). The mathematical tool used in the proposed methodology is the structured singular value, µ. For comparison purposes, the paper uses a method largely employed in the aircraft industry to measure the quoted AFCS attributes. The issues existing in this methodology are discussed and it is shown that the proposed method presents one elegant path to deal with the mentioned drawbacks. A step by step procedure is provided, incorporating the advantages offered by the approach currently used in the industry and eliminating its weaknesses.

Aircraft control design with linear and non linear techniques: comparative aspects

“…Research of gain scheduling applications in civil aircraft and other areas developed gradually since then, examples of its implementation in aircraft control are Dagfinn Gangsaas, John Hodgkinson et. al, (2008), and Alex S. F. da Silva et. al, (2011).…”

Longitudinal stability and control augmentation with robustness and handling qualities requirements using the two degree of freedom controller

“…Recently, [10] presented the use of advanced flight controls research and development applied to business jet aircraft. [11] propose a methodology to assess the robust stability and robust performance of Automatic Flight Control Systems (AFCS) using gain scheduling and optimization and [12] add the quantum particle swarm optimization (QPSO) to improve the LQR. However, all the mentioned works use the LQR in the time domain employing a considerable number of linear models to guarantee a specific performance and robustness in the overall flight envelope; this process generates several gain scheduling tables.…”