الفهرس 
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Abstract
thesis is concerned with the performance of. linear time- output feedback control systems. The system is by finite word length microprocessor with floating-point The effect of choosing the sampling period on sampling. ’and total errors is investigated to determine the optimal under various word lengths. t. is noticed that the error resulting from iscretizing the while that resulting from the effect of length is stochastic in nature. formulation of the continuous control problem and its br>are offered. Three important lemmas and a novel calculate the mean-value for multiplication of threebeen completely developed with their necessary at proves. These lemmas are used to calculate the roundoff the controller.Also.general methods to calculate the or for different operations are introduced. discrete controller with sampling and roundoff has been ietails.A computer algorithm to find out the output is presented with the required modifications.
proves of three different methods for the output feedback control system, with one sample- delay are given in detail with the error analysis and the modifications of the computer algorithm used to calculate ’lftt110d3 in each of these methods. A comparison among these three 13 pre5ented. ,hen taking into account the delayed resulting from computation time f the microprocessor and when neglecting it, is presented. The analysis of the resul ts obtained for an illustrative !xample applied to nondelayed and delayed controller is presented for simulation and approximate solution of the average equations. Thedigital simulation results are summarized as, for 24 - and 32-bit microprocessors the optimalsampling period (represents minimum total error) liesat the boundary of the constraints determining the permissible microprocessor speeds for all applied methods. This result is also obtained for 16-bit microprocessor of the delayed cGlse using the second method. On the other hand, for 16-bit microprocessor the optimal sampling period is found to be between 0.015 and 0.025 sec. for nondelayed and delayed controller using the third method (part 1) which is within existing technology of microprocessor speeds.However, if the available technology is above this level (say above 0.025 sec.) the optimal sampling period will be taken as the minimum feasible total error.Alsothe results revealed that the simulation and approximate solution of the average equations are comparable for the different employed methods.