A History of Low Order Equivalent Systems for Aircraft Handling Qualities Analysis and Design

Hodgkinson, J.

doi:10.2514/6.2003-5466

Cited by 5 publications

(8 citation statements)

References 6 publications

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“…Furthermore, this increase in RMS error was even more pronounced with a zero location further into the left half plane for lower frequencies (Fig. 15)  [13,14]. In fact, the interaction between the zero location and frequency was significant (F (1,207) =10.001, p≤0.01) and η 2 was 0.0242.…”

Section: Zero Location Effects On Rms Errormentioning

confidence: 75%

Piloting changes to changing aircraft dynamics: What do pilots need to know?

Trujillo¹,

Gregory²

2011

2011 IEEE/AIAA 30th Digital Avionics Systems Conference

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An experiment was conducted to quantify the effects of changing dynamics on a subject's ability to track a signal in order to eventually model a pilot adapting to changing aircraft dynamics. The data will be used to identify primary aircraft dynamics variables that influence changes in pilot's response and produce a simplified pilot model that incorporates this relationship. Each run incorporated a different set of second-order aircraft dynamics representing short period transfer function pitch attitude response: damping ratio, frequency, gain, zero location, and time delay. The subject's ability to conduct the tracking task was the greatest source of root mean square error tracking variability. As for the aircraft dynamics, the factors that affected the subjects' ability to conduct the tracking were the time delay, frequency, and zero location. In addition to creating a simplified pilot model, the results of the experiment can be utilized in an advisory capacity. A situation awareness/prediction aid based on the pilot behavior and aircraft dynamics may help tailor pilot's inputs more quickly so that PIO or an upset condition can be avoided.

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Section: Zero Location Effects On Rms Errormentioning

confidence: 75%

Piloting changes to changing aircraft dynamics: What do pilots need to know?

Trujillo¹,

Gregory²

2011

2011 IEEE/AIAA 30th Digital Avionics Systems Conference

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“…As indicated earlier, the effective vertical path control for safe and high rate boarding depends on aircraft control capability, 15–17 rapid engine response 18 and pilot training level. 13,18 The carrier guidance system, controlled by the LSO, helps the pilot in performing all necessary trajectory corrections in glideslope, angle of attack and lineup during the last 15–20 s 15,17,18 Adequate pilot and LSO training plus improved guiding equipment have reduced accidents and mishaps by a factor of 10 since the 60s (see Rudowsky et al.…”

Section: Final Approach Guidance To An Aircraft Carriermentioning

confidence: 94%

“…Equations (6) and (7) are coupled through C D = f ( C L ). Moreover, the actual airplane behaviour is coupled through its dynamic stability, 15–19 and the pilot must keep fine control of the airplane speed and attitude by means of the elevator (and therefore the angle of attack) and throttle. 15,18…”

Section: Final Approach Guidance To An Aircraft Carriermentioning

confidence: 99%

“…Due to the limited scope of the present research work, the manuscript does not address the Flight Dynamics of the approach that could be covered in a subsequent paper. Interested readers can refer to literature 13–20 for a detailed account of evolving naval fighter stability and control. On another side, the arresting manoeuvre analysis includes the comparison between airfield arrested landings and real on-deck recoveries, taking Eurofighter Typhoon and Saab Gripen as case studies, because these aircraft are potential candidates, and exhibit adequate combat capabilities.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary suitability analysis of carrier approach guidance and recovery of land-based aircraft

Hernando

Martínez‐Val

2015

Proceedings of the Institution of Mechanical Engineers, Part G:

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Due to geopolitical, technical and economic reasons, Harrier V/STOL airplanes will soon be retired from service. Since many Navies rely on these aircraft for their combat capability, this will imply a severe operational trouble. One of the replacement possibilities is to modify ground-based designs and make them compatible with carrier operations. This paper presents the initial results of a study aimed at assessing existing ground-based combat airplanes from the point of view of their approach guidance and recovery compatibility with midsize aircraft carriers. The analysis includes operational and performance aspects, describes the complexity of these manoeuvres, and identifies the key variables intervening, crucial for carrier suitability.

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“…A mismatch above about 100 is usually interpreted as an indication of a poor equivalent system and is often associated with poor handling qualities. 31 In summary, the equivalent system approach was supposed to represent the complete airplane dynamics and guide flight control designers to produce a system with good classical types of response modes that would be natural to a pilot. There are nuances that remained, but it is our opinion that this approach for classical response modes is still the most valid one in general terms.…”

Section: Evolution: Airplane Handling Qualities Specifications and Thmentioning

confidence: 99%