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Abstract
This paper applies the frequency response methodology to characterize and analyze the flying qualities of longitudinal and lateral axes of a rotary-wing aircraft, AS355-F2. Using the results, it is possible to check the suitability of the aircraft in accordance with ADS-33E-PRF standard, whose flying qualities specifications criteria are based on parameters in the frequency domain. The key steps addressed in the study involve getting, by means of flight test data, the closed-loop dynamic responses including the design of the instrumentation and specification of the sensors to be used in the flight test campaign, the definition of the appropriate maneuvers characteristics for excitation of the aircraft, the planning and execution of the flight test to collect the data, and the proper data treatment, processing and analysis after the flight. After treatment of the collected data, single input-single output spectral analysis is performed. The results permit the analysis of the flying qualities characteristics, anticipation of the demands to which the pilot will be subjected during closed-loop evaluations and check of compliance with the aforementioned standard, within the range of consistent excitation frequencies for flight tests, setting the agility level of the test aircraft.
Highlights
The aircraft flying qualities, for both rotary and fixed-wing aircraft, determine the easiness and precision with which the pilot is able to perform the operational tasks that constitute the mission proposed for that air vehicle (Williams et al 1995)
Flying qualities evaluations can be conducted in qualitative and quantitative ways. They are assessed by testing in closed-loop form, in which the pilot effectively acts on the flight controls to fulfill certain task
The pilot observes the aircraft response, determines the error between the actual and desired response and, if the error exists, he performs an additional control input to reduce or eliminate it. He considers all actions applied on flight controls and the performance reached to determine the overall workload due to the compensation of the aircraft deficiencies added by that due to the properly execution of the task (Brasil 2003)
Summary
The aircraft flying qualities, for both rotary and fixed-wing aircraft, determine the easiness and precision with which the pilot is able to perform the operational tasks that constitute the mission proposed for that air vehicle (Williams et al 1995). The pilot observes the aircraft response, determines the error between the actual and desired response and, if the error exists, he (she) performs an additional control input to reduce or eliminate it In the end, he (she) considers all actions applied on flight controls and the performance reached to determine the overall workload due to the compensation of the aircraft deficiencies (effort and attention required) added by that due to the properly execution of the task (Brasil 2003). He (she) considers all actions applied on flight controls and the performance reached to determine the overall workload due to the compensation of the aircraft deficiencies (effort and attention required) added by that due to the properly execution of the task (Brasil 2003) He (she) employs the handling qualities rating (HQR) like the Cooper-Harper scale (Cooper and Harper Junior 1969). Other factors influence the final rating given by the pilot, such as the interface with the cabin (displays, commands and controls), the environment
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