Browsing by Author "Steer, Anthony J."

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    An analysis of the flight dynamics of a second generation SST aircraft
    (1999) Steer, Anthony J.
    This interim report covers an initial overview of delta-wing aircraft static, dynamic and control characteristics, collated from publications within the public domain and the authors related research. This is to give the reader an overall understanding how a delta-winged supersonic transport aircraft’ s characteristics differ to those of a conventional civil transport aircraft. This is followed by identifying the aircraft’s static and dynamic stability, with the effect of speed and CG location on the aircraft dynamic modes specifically addressed. Following this, a comprehensive investigation and analysis of the open loop response of a SCT baseline aircraft, in both low-speed cruise and approach and landing conditions, has been carried out. Both time and frequency domain techniques have been utilised. Finally, conclusions are made based on the results of the work presented.
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    On minimizing maximum transient energy growth
    (2005-06-27T00:00:00Z) Whidborne, James F.; McKernan, John; Steer, Anthony J.
    The problem of minimizing the maximum transient energy growth is considered. This problem has importance in some fluid flow control problems and other classes of non-linear systems. Conditions for the existence of static controllers that restrict the maximum transient energy growth to unity are established. An explicit parametrization of all linear controllers ensuring monotonic decrease of the transient energy is derived. It is shown that by means of a Q-parametrization, the problem of minimizing the maximum transient energy growth can be posed as a convex optimization problem that can be solved by means of a Ritz approximation of the free parameter. By considering the transient energy growth at an appropriate sequence of discrete time points, the minimal maximum transient energy growth problem can be posed as a semidefinite problem. The theoretical developments are demonstrated on two numerical problems.