The flight control system designer is increasingly concerned with the problem of providing adequate stability of the elastic modes of the flight vehicle. The problem of stabilizing bending modes can be solved by the use of different bending filters. But continuously changing behavior of the elastic modes frequencies makes it impossible to suppress the elastic modes. In this paper, adaptive tracking filter is used to solve this problem. Where it can track the frequency of predominant oscillatory component of its input signal and automatically adjust the shaping characteristics as a function of this frequency. Simulation results are presented to show the frequency tracking accuracy and response of the flight launch vehicle, which are based on the assumption that, only first bending mode is selected at a time. Comparison with the second order band pass filter is carried out in order to emphasis the effectiveness of this design methodology.
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