Assessment of flying-quality criteria for air-breathing aerospacecraft

Summary Good flying qualities for approach and landing depend on the selection of a proper response type,and the achievement of dynamic characteristics which fall in the desirable region of certain definedFQ criteria. The concept of response type has been developed to quantify the generic output and inputcharacteristics of the aircraft plus flight-control system (ref. 22). Several response types applicable to theflared landing task include rate command, attitude hold; attitude command, attitude hold; and flightpathcommand, flightpath hold. Experience has shown that the following factors must be considered toachieve desirable approach and landing FQ for the flared landing task.1. Precision control of pitch attitude.2. Precision control of flightpath angle.3. Consonance between flightpath angle and pitch attitude.4. Proper control sensitivity.5. Sufficient authority to change the flightpath with pitch attitude and with adequate margin fordisturbances and pilot error.As described in reference 22 and many previous papers, the aircraft bandwidth WBW and phasedelay parameter -rpare useful metrics to codify and predict FQ for tasks where small amplitude, precision,closed-loop tracking, or regulation is a primary requirement on the pilot-vehicle system. These quantitiesare defined for the case of airplane pitch response to elevator in figure 14. The 45°-phase margin26

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