This paper presents the analysis and study of common shimmy dampers used today for main landing gears with the use of analytical and numerical tools. The shimmy phenomenon is studied by using the tire stretched string theory model and by developing linear approximations of the dynamics of a single tire landing gear. The dynamics of commonly used shimmy dampers are then incorporated into the model. The objectives of this paper are to study already developed shimmy damper designs and to develop tools to design a new innovative and better shimmy damper for main landing gears, those which have nonsteerable wheels. Two shimmy damper designs are studied in this paper, one developed by Boeing and another by UTC Aerospace Systems (UTAS). A linear approximation of the dynamics of these dampers is obtained, omitting the freeplay, saturation, and nonlinear dynamics. Stability plots are then created by changing the system's parameters, such as the velocity, caster length, and the shimmy damper stiffness and damping coefficients. These plots show the comparison of using a UTC two-arm design against the Boeing damper, for which the former spans larger zones of stability but requires higher damping coefficients due to the UTC damper's geometry which is very impractical. In addition, a multibody model is developed in MSC adams (from MSC Software Corporation) to study the dynamic response of these systems and to create a modeling tool that can be used to design a new and improved shimmy damper for main landing gears. The simulation results from the model show the disadvantages of using the UTC two-arm damper, which include an asymmetrical vibration response. Further recommendations are given to design an improved shimmy damper.
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August 2016
Research-Article
Linear Stability Analysis and Dynamic Response of Shimmy Dampers for Main Landing Gears
Carlos Arreaza,
Carlos Arreaza
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: arreaza.c@gmail.com
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: arreaza.c@gmail.com
Search for other works by this author on:
Kamran Behdinan,
Kamran Behdinan
Mem. ASME
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: behdinan@mie.utoronto.ca
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: behdinan@mie.utoronto.ca
Search for other works by this author on:
Jean W. Zu
Jean W. Zu
Mem. ASME
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: zu@mie.utoronto.ca
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: zu@mie.utoronto.ca
Search for other works by this author on:
Carlos Arreaza
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: arreaza.c@gmail.com
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: arreaza.c@gmail.com
Kamran Behdinan
Mem. ASME
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: behdinan@mie.utoronto.ca
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: behdinan@mie.utoronto.ca
Jean W. Zu
Mem. ASME
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: zu@mie.utoronto.ca
Mechanical and Industrial Engineering,
University of Toronto,
5 King's College Road,
Toronto, ON M5S 3G8, Canada
e-mail: zu@mie.utoronto.ca
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received September 10, 2015; final manuscript received April 19, 2016; published online May 20, 2016. Assoc. Editor: Alexander F. Vakakis.
J. Appl. Mech. Aug 2016, 83(8): 081002 (10 pages)
Published Online: May 20, 2016
Article history
Received:
September 10, 2015
Revised:
April 19, 2016
Citation
Arreaza, C., Behdinan, K., and Zu, J. W. (May 20, 2016). "Linear Stability Analysis and Dynamic Response of Shimmy Dampers for Main Landing Gears." ASME. J. Appl. Mech. August 2016; 83(8): 081002. https://doi.org/10.1115/1.4033482
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