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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Flying qualities and flight control system design for a fly-by-wire transport aircraft

Gautrey, Jim January 1998 (has links)
Fly-by-wire flight control systems are becoming more common in both civil and military aircraft. These systems give many benefits, but also present a new set of problems due to their increased complexity compared to conventional systems and the larger choice of options that they provide. The work presented here considers the application of fly-by-wire to a generic regional transport aircraft. The flying qualities criteria used for typical flying qualities evaluations are described briefly followed by analysis of several past transport aircraft flying qualities programmes against these criteria. From these results, some control law independent design requirements are formulated for a civil aircraft for the approach and landing task. These control law independent flying qualities criteria are intended to be used with any generic rate-like control law for a transport aircraft and enabled a number of different control laws to be designed. The results of a number of flying qualities evaluations are presented. Both an ILS approach task and a formation flying task were used. The effects of windshear were also considered. It was found that control laws which maintain flight path are suitable for the ILS approach task, while most rate-like response characteristics give good flying qualities for the formation flying task. Finally, the conclusions drawn from these evaluations are presented, and both the Civil and Military current airworthiness requirements are assessed. In addition to the flying qualities work, a study is made of the management issues associated with fly-by-wire design. A fly-by-wire aircraft design programme was proposed and the project management issues associated with this were considered. A timescale was proposed for the design process for a generic regional aircraft, and the critical path for this process is presented.

The vibrational response of dynamically-tuned gyroscopes using a new analytical model

Wilson, Sarah Louise January 1993 (has links)
No description available.

Experimental evaluation of the performance and robustness of advanced rotor control schemes

Mullen, Gerald John January 1998 (has links)
No description available.

Nonlinear flight control system for lateral manoeuvres in wind shear

Indriyanto, Toto January 2000 (has links)
No description available.

Active control of aerodynamic instabilities

Huang, X. January 1988 (has links)
No description available.

Adaptive nonlinear modelling of the W30 helicopter using neural networks

Thomas, Stephen Malcolm January 1996 (has links)
No description available.

Modelling simulation and control of a remotely piloted vehicle

Linehan, Rory Daniel January 1995 (has links)
No description available.

A method for specifying complex real-time systems with application to an experimental variable stability helicopter

Bradley, Roy January 1992 (has links)
No description available.

On-line identification investigation

Ture, M. January 1992 (has links)
No description available.

An investigation into the use of multivariable control theory in multi-channel structural testing

Tsavdaras, Serafim January 1990 (has links)
The aim of this project is to investigate the potential use of multivariable control theory in multi-channel dynamic structural testing. The ideal behaviour of a control system for dynamic testing is analysed and this is used to provide the specifications for control schemes for both sinusoidally derived and random loadings. The need for an integrated multivariable control system approach is shown. An experimental test rig is used to test the applicability of multivariable control methods to dynamic testing. The rig consists of a cantilever beam which can be excited into vibration by two electrodynamic shakers. The displacement on two locations on the beam is measured by Linear Variable Displacement Transducers (LVDTs). The rig is configured to provide the worst possible cross-coupling between different input-output pairs. Analytical modelling of the test is accomplished by regarding the cantilever beam as continuous elastic body. The order of the models, which can be either in state-space or in transfer function matrix form, is a function of the frequency range over which accurate modelling is required. The output variable can be displacement, velocity or force. The analytical modelling led to programs for the simulation of the beam for any given input time series and for a varying number of vibrators and output measurement transducers. The locations of both shakers and output sensors can be varied at will by a procedure which is transparent to the user. The multivariable control methods used for controller design are the characteristic locus and the Nyquist array method with recent extensions. Emphasis waS given during the design process to producing robust performance and stability. Both the characteristic locus and the Nyquist array designs were assessed using singular value decomposition analysis and were found to perform satisfactorily. The merits of both designs are analysed and compared. In the initial stages of the project a considerable amount of time was devoted to developing a C.A.D. package for multivariable control. The features of this package are described. Also software development based on the MATLAB package is discussed.

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