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C* Criterion
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TABLE 10.3 Handling Qualities Specified Values for Transient Response Parameters
Source: Shaik, I. and Chetty, S. HQPACKUser’s Guide, Vols. 1, 2. PC based SW package in MATLAB ver 5.2 for the prediction of handling qualities and pilot induced oscillation tendencies of aircaft. NAL Project document, PD-FC-9810, December 1998. |
combination of both types of responses. The criterion is used by control system designers. The C* boundaries are specified for various categories of the flight phases. C* is given as
C*(t) = normal acceleration in g’s + 12.4 q(rad/s)
The value of 12.4 is arrived at as crossover velocity (121 m/s) divided by “g.”
10.4.1.4 Gibson’s Criteria
Gibson’s criteria are based on both time and frequency responses of the aircraft [19,20]. The pitch attitude after following the stick command remains constant when the input is removed. The attitude dropback is defined as the condition in which the attitude goes back to its previous value after the stick input is removed. These criteria are applicable to linear systems and mainly to maneuvering type of aircraft, as the criteria do not consider flight path control. Since the criteria are generally used for flight control development and optimization, the HQ level boundaries are not
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TABLE 10.4 Handling Qualities Specified Values for Rise Time Terminal Flight Phase Nonterminal Flight Phase
Source: Shaik, I. and Chetty, S. HQPACK User’s Guide, Vols. 1, 2. PC based SW package in MATLAB ver 5.2 for the prediction of handling qualities and pilot induced oscillation tendencies of aircaft. NAL Project document, PD-FC-9810, December 1998. Note: All the rise time entries should be divided by the true velocity (in ft/s). |
really defined. The pitch attitude dropback should not be negative for Categories A and C flight phases. For Category A the frequency response specifications are = 0.55; <Bymax = 1.95. For approach and landing some boundaries are speci-
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fied. The frequency at —120° phase (lag) is required to be within 0.25 and 0.5 Hz. The pitch attitude frequency response should have gained attenuation greater than 0.1°fdB at —180° phase. The phase rate should be lower than 100°fHz. Many other aspects of Gibson’s criteria are discussed in Refs. [16,17].
