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Lateral Stability of Aircraft Nose-Wheel Landing Gear with Closed-Loop Shimmy Damper

DSpace at IIT Bombay

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Title Lateral Stability of Aircraft Nose-Wheel Landing Gear with Closed-Loop Shimmy Damper
 
Creator SURA, NK
SURYANARAYAN, S
 
Subject models
 
Description Shimmy of aircraft nose-wheel landing gear is a coupled lateral and torsional dynamic instability that may occur during take off, taxi, and landing. The potential for shimmy is often discovered when the aircraft undergoes taxi (runway) tests. At this stage the options available to the designer are limited, often to introducing a damper in the steering degree of freedom. This paper presents modeling and analysis of shimmy of a 3 degrees-of-freedom linear nose-wheel landing gear model with a closed-loop shimmy damper mechanism attached to its hydraulic steering. A typical control law is considered for representing the closed-loop hydraulic control in the steering rack and pinion system. The stability of the system is studied using root locus plots. The results for critical velocity obtained for different values of gain in the closed-loop shimmy damper show that it can he simulated by an equivalent open-loop shimmy damper with appropriate value of damping. This suggests that an equivalent open-loop shimmy damper model can be used in place of the closed-loop shimmy damper to simplify the modeling of integrated airframe-landing gear dynamics.
 
Publisher AMER INST AERONAUT ASTRONAUT
 
Date 2011-07-15T09:35:32Z
2011-12-26T12:49:24Z
2011-12-27T05:42:39Z
2011-07-15T09:35:32Z
2011-12-26T12:49:24Z
2011-12-27T05:42:39Z
2009
 
Type Article
 
Identifier JOURNAL OF AIRCRAFT, 46(2), 505-509
0021-8669
http://dx.doi.org/10.2514/1.37626
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4223
http://hdl.handle.net/10054/4223
 
Language en