Stability Analysis in Conceptual Design Using SDSA Tool

Goetzendorf‐Grabowski, Tomasz; Mieszalski, Dawid; Marcinkiewicz, Ewa

doi:10.2514/6.2010-8242

Cited by 5 publications

(1 citation statement)

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“…Dynamic stability analysis was performed in a number of computational cases. We considered not only the level flight but also non-horizontal flight conditions (both, steady climbing and descending) at different altitudes, airspeeds, take-off weights and positions of centre of gravity (Goraj, 2014; Goetzendorf-Grabowski et al , 2010). The outcomes of all calculations show a negligible influence of gyroscopic effects induced by small disturbances of steady-state flight.…”

Section: Assessment Of Influence Of Gyroscopic Effectsmentioning

confidence: 99%

Influence of weak and strong gyroscopic effects on light aircraft dynamics

Goraj

Cichocka

2016

AEAT

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Purpose The purpose of this study is to investigate the influence of gyroscopic effects on the dynamic stability and the response of light aircraft to manoeuvres following either a rapid deflection of the control surfaces or wind gust. Design/methodology/approach The analyses were conducted for several different mathematical models of aircraft motion, which allowed for the investigation of the relationship between introduced simplifying assumptions and the aircraft response, including non-linear terms in equations of motion expressing the influence of inertial coupling. The analytical and experimental methods (measurements in the wind tunnel for the scaled model and during flight tests of I-31T prototype aircraft) were used. Findings It was found that gyroscopic moments are induced mainly by the propeller, and their influence on dynamic stability of a light aircraft is negligible. However, these phenomena in manoeuvring flight investigation should not be excluded, although for general aviation (GA) aircraft, they are not strong. Hence, two types of gyroscopic effects depending on the level of steady flight disturbances were distinguished. The authors differentiated weak gyroscopic effects, corresponding to classical dynamic stability, and strong gyroscopic effects, corresponding to rapid manoeuvres. Practical implications Conclusions include some findings on the nature of gyroscopic effects (i.e. sensitivity of flight stability versus turboprop power unit parameters) and practical recommendations for aircraft designers dealing with new configurations of GA aircraft. Originality/value The analysis focuses on the assessment of the flight dynamics of light aircraft with a novel, compact, lightweight, fast-rotating turbopropeller engine and strong/weak gyroscopic effects.

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Section: Assessment Of Influence Of Gyroscopic Effectsmentioning

confidence: 99%