TABLE 11 ROLL AXIS DISTURBANCE TORQUES As discussed earlier, the transient performance requirements for the roll axis called for a damping ratio of 0.5 and an undamped natural frequency equal to a factor of 10 less than the lowest roll-axis anti-symmetrical bending mode frequency. From the model data given in Table 10, this corresponds to an undamped natural frequency of 0.00492 rad/sec. Using Equations (1) and (2), the roll-axis control parameters which satisfy these performance requirements were found to be: With the above set of baseline parameter values, the dynamic performance of the roll axis was evaluated using the parametric performance indices defined in Tables 1 and 5 in Reference 35. The results of this performance analysis are summarized below:
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