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Articles by Mohammed Qasim Taha
Total Records ( 2 ) for Mohammed Qasim Taha
  Mohammed Qasim Taha , Mustafa Hamid AL-Jumaili and Abdullah Khalid Ahmed
  In this research, mathematical modeling for the coaxial cable has been used to analyze transmission line performance under three different dielectric mediums which are propagation medium in the coaxial cable and to illustrate their role in the amount of Characteristic Impedance (Char Imp) of the transmission line. Polyimide, polyethylene and Teflon dielectric materials have been examined to extract the values of the electrical model elements, hence, the total reluctance and attenuation of the line. Also, this analysis is related to dielectric mediums with respect to dielectric heat losses and its influences on coaxial cable inner and outer conductors. Therefore, the mathematical model assembled by MATLAB is used to examine coaxial cables performance according to the above effects of (dielectrics) insulators performance. Extracted results have demonstrated the losses and attenuation in the propagation of electromagnetic waves.
  Mohammed Qasim Taha , Zaid H. Ali and Amer T. Saeed
  In this research, Four-Quadrant DC Motor (FQDCM) operation is managed by determining alternating referenced speed command to a DC motor with a fixed ramp. The proposed speed controller is utilized to trace the instantaneous reference speed. A Simulink Model of the system has been built to match the hardware connections for the motor and DSpace equipment which interfaces the MATLAB Simulink with the motor monitoring probes. The operator DC-motor is coupled to the FQDCM. Also, current, terminal voltage and speed-torque relation equations are modeled using MATLAB code to regulate the experimental parts and extract the instantons values to be used in the analysis to observe the motor and control it under torque-control. This study will also address the monitoring of the speed controlled as well as torque-controlled motors to monitor and analyze the motor performance under the influence of stepped changing torque.
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