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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.
1

The application of robust inverse dynamics estimation to the control of a thrust vectoring fighter aircraft

Muir, Ewan Andrew McPherson January 1996 (has links)
No description available.
2

Estimating projected controllable sets for dynamical control systems.

Wu, Zong Yeng. January 1988 (has links)
A method is developed to estimate the projection of a higher dimensional (three or more) controllable set onto a lower dimensional (usually one or two) space. This method requires that an n-dimensional dynamical system subject to a scalar control be transformed into two lower dimensional subsystems by choosing a proper transformation matrix. It is shown that such a transformation can always be determined for an n-dimensional linear I/O system. For some nonlinear dynamical system problems such as an aircraft missile avoidance problem, a proper transformation matrix still can be determined. From the transformed system, both an overestimate and an underestimate for an actual projected controllable set in the state space of interest can be provided by using the method presented in this dissertation. With these information, the actual projected controllable set can be estimated. Two linear I/O systems subject to a scalar control and an aircraft missile avoidance problem are used to illustrate the method.
3

Adaptive nonlinear modelling of the W30 helicopter using neural networks

Thomas, Stephen Malcolm January 1996 (has links)
No description available.
4

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.
5

Lateral pulse jet control of a direct fire atmospheric rocket using an inertial measurement unit sensor system

Jitpraphai, Thanat 19 July 2001 (has links)
Impact point dispersion of a direct fire rocket can be drastically reduced with a ring of appropriately sized lateral pulse jets coupled to a trajectory tracking flight control system. The system is shown to work well against uncertainty in the form of initial off-axis angular velocity perturbations as well as atmospheric winds. For an example case examined, dispersion was reduced by a factor of one hundred. Dispersion reduction and mean miss distance are strong functions of the number of individual pulse jets, the pulse jet impulse, and the trajectory tracking window size. Proper selection of these parameters for a particular rocket and launcher combination is required to achieve optimum dispersion reduction to the pulse jet control mechanism. For the lateral pulse jet control mechanism that falls into the category of an impulse control mechanism, the trajectory tracking flight control law provides better reduction in dispersion and mean miss distance than the proportional navigation guidance law especially when small number of individual pulse jets is used. Estimation of body frame components of angular velocity and angular acceleration of a rigid body projectile undergoing general three-dimensional motion using linear acceleration measurements is considered. The results are comparable to those obtained from a conventional Inertial Measurement Unit (IMU) that composes of accelerometers and gyroscopes. From the study of the effect of sensor errors to the measurement and the control performance, the sensitivity of the angular rate estimation to the sensor noise is a strong function of the constellation of these three accelerometers. When more than three point measurements are used, the most effective method to fuse data is with one cluster that contains all sensors. In the conventional IMU, the dispersion and miss distance are less sensitive to the errors from accelerometers than to the gyroscopes. The estimation of angular rates plays essential roles in the performance of the control system in the reduction of dispersion and miss distance. The use of many accelerometers does not guarantee to reduce the sensitivity to errors. The selection of constellation among accelerometers in the data fusion process must be carefully taken into account. / Graduation date: 2002
6

Computational environment for the development of an FAA compliant level 6 flight training device

Mullins, Steven January 2009 (has links)
Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains xii, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 76-77).
7

Evolutionary design of robust flight control for a hypersonic aircraft

Austin, K. J. Unknown Date (has links)
No description available.
8

Evolutionary design of robust flight control for a hypersonic aircraft

Austin, K. J. Unknown Date (has links)
No description available.
9

Evolutionary design of robust flight control for a hypersonic aircraft

Austin, K. J. Unknown Date (has links)
No description available.
10

Evolutionary design of robust flight control for a hypersonic aircraft

Austin, K. J. Unknown Date (has links)
No description available.

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