H°°-design and the improvement of helicopter handling qualities
<p>This thesis presents the results of a study into the use of <em>H</em><sup>ꝏ</sup>-optimization for the design of feedback control laws for improving the handling qualities of a Lynx helicopter. An important improvement to the <em>H</em><sup>ꝏ</...
| Auteurs principaux: | , |
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| Autres auteurs: | |
| Format: | Thèse |
| Langue: | English |
| Publié: |
1988
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| _version_ | 1826316492925304832 |
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| author | Yue, A Yue, Andrew |
| author2 | Postlethwaite, I |
| author_facet | Postlethwaite, I Yue, A Yue, Andrew |
| author_sort | Yue, A |
| collection | OXFORD |
| description | <p>This thesis presents the results of a study into the use of <em>H</em><sup>ꝏ</sup>-optimization for the design of feedback control laws for improving the handling qualities of a Lynx helicopter. An important improvement to the <em>H</em><sup>ꝏ</sup>-optimization procedure is the reduction in the number of iterative steps in the γ-iteration before convergence to the optimal γ. Some new algorithms are derived which significantly reduce the computation time for the γ-iteration. Both 2-block and 4-block cases are considered.</p> <p>Control laws are designed for precise control of pitch and roll attitude, yaw rate and heave velocity. Analysis of the raw helicopter showed the need for a stability augmentation system as the dynamic characteristics of the unaugmented helicopter do not comply with military helicopter handling qualities requirements. Results from current research on helicopter handling qualities were used as guidelines in order to define the required dynamic characteristics. A six-degree of freedom nonlinear simulation was used to analyse the helicopter dynamic time histories.</p> <p>A possible solution to the problem of incorporating helicopter handling qualities in the design of robust controllers is to use a two-degree of freedom controller structure. This is illustrated using both <em>H</em><sub>2</sub> and <em>H</em><sup>ꝏ</sup>-optimization.</p> <p>A piloted simulation study to assess the effectiveness of advanced control laws was initiated at RAE, Bedford.The trials were carried out in the single seat cockpit flight simulator, at the Flight Research Division and represent the first ever real-time piloted simulation using a <em>H</em><sup>ꝏ</sup>-controller.</p> |
| first_indexed | 2024-03-06T21:30:06Z |
| format | Thesis |
| id | oxford-uuid:4468a3ab-7297-4363-b605-b3e1f301d11b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:46:05Z |
| publishDate | 1988 |
| record_format | dspace |
| spelling | oxford-uuid:4468a3ab-7297-4363-b605-b3e1f301d11b2024-12-07T18:02:17ZH°°-design and the improvement of helicopter handling qualitiesThesishttp://purl.org/coar/resource_type/c_db06uuid:4468a3ab-7297-4363-b605-b3e1f301d11bDesign and constructionHandling characteristicsHelicoptersEnglishPolonsky Theses Digitisation Project1988Yue, AYue, AndrewPostlethwaite, IPostlethwaite, I<p>This thesis presents the results of a study into the use of <em>H</em><sup>ꝏ</sup>-optimization for the design of feedback control laws for improving the handling qualities of a Lynx helicopter. An important improvement to the <em>H</em><sup>ꝏ</sup>-optimization procedure is the reduction in the number of iterative steps in the γ-iteration before convergence to the optimal γ. Some new algorithms are derived which significantly reduce the computation time for the γ-iteration. Both 2-block and 4-block cases are considered.</p> <p>Control laws are designed for precise control of pitch and roll attitude, yaw rate and heave velocity. Analysis of the raw helicopter showed the need for a stability augmentation system as the dynamic characteristics of the unaugmented helicopter do not comply with military helicopter handling qualities requirements. Results from current research on helicopter handling qualities were used as guidelines in order to define the required dynamic characteristics. A six-degree of freedom nonlinear simulation was used to analyse the helicopter dynamic time histories.</p> <p>A possible solution to the problem of incorporating helicopter handling qualities in the design of robust controllers is to use a two-degree of freedom controller structure. This is illustrated using both <em>H</em><sub>2</sub> and <em>H</em><sup>ꝏ</sup>-optimization.</p> <p>A piloted simulation study to assess the effectiveness of advanced control laws was initiated at RAE, Bedford.The trials were carried out in the single seat cockpit flight simulator, at the Flight Research Division and represent the first ever real-time piloted simulation using a <em>H</em><sup>ꝏ</sup>-controller.</p> |
| spellingShingle | Design and construction Handling characteristics Helicopters Yue, A Yue, Andrew H°°-design and the improvement of helicopter handling qualities |
| title | H°°-design and the improvement of helicopter handling qualities |
| title_full | H°°-design and the improvement of helicopter handling qualities |
| title_fullStr | H°°-design and the improvement of helicopter handling qualities |
| title_full_unstemmed | H°°-design and the improvement of helicopter handling qualities |
| title_short | H°°-design and the improvement of helicopter handling qualities |
| title_sort | h°° design and the improvement of helicopter handling qualities |
| topic | Design and construction Handling characteristics Helicopters |
| work_keys_str_mv | AT yuea hdesignandtheimprovementofhelicopterhandlingqualities AT yueandrew hdesignandtheimprovementofhelicopterhandlingqualities |