Analysis Of Control Transfer Function Of Guided Missile

In this dissertation, a research has been made on the analyzing the guided missile control transfer function by using the analysis of the frequency response of the transfer function. The chief method employed herein is based upon frequency-response analysis and depends upon the Nyquist criterion of stability. The method consists essentially in drawing a block diagram of the system, determining the transfer functions of each individual block, and determining the open-loop transfer function for the system. First derive the transfer function of each component of the system and then combine them to get the complete open loop system transfer function. After that check the stability of the system by using bode frequency response curves and the Nichols chart. Phase and amplitude characteristics as functions of forcing frequency are obtained from the open-loop transfer function. These are then plotted on the rectangular coordinates of a Nichols log-modulus- angle chart. The location of the resulting curve relative to the center point of the Nichols chart, which is intersection of -180 degree phase lag and 0 db gain lines, and the shape of the curve determine the stability of the system and its natural frequency. After checking the stability and according to the result, make a modification by adding stabilization network to meet the required stability margins and transient and steady state response specifications. At last derive the closed loop transfer function and recheck unit step time response of the system.The components of the guided missile and brief notes of the system control engineering are presented in section (1). Plotting system logarithmic frequency response curves are presented in section (2). Drawing the constant logarithmic magnitude curve and constant phase curve in the complex plane and on the Nichols chart are presented in section (3). The nature of time response and the time response characteristics of the second order system are presented in section (4). Finally, the analysis of transfer function of missile control system is presented in section (6).