Article | 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden | Test Rig Landing Gear Free-Fall System Model Simulation and Design Optimization Using Matlab
Göm menyn

Title:
Test Rig Landing Gear Free-Fall System Model Simulation and Design Optimization Using Matlab
Author:
Mário Maia Neto: Department of Mechanical Engineering, Aeronautical Institute of Technology, S√£o Joså dos Campos, SP, Brazil Luiz Carlos Sandoval Góes: Department of Mechanical Engineering, Aeronautical Institute of Technology, S√£o Joså dos Campos, SP, Brazil
DOI:
10.3384/ecp1392a23
Download:
Full text (pdf)
Year:
2013
Conference:
13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
Issue:
092
Article no.:
023
Pages:
229-238
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2013-09-09
ISBN:
978-91-7519-572-8
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


Export in BibTex, RIS or text

In order to comply with the safety level demanded by civil certification requirements and military standards; alternative methods of extending retractable landing gear are provided in practically all airplanes of this type currently flying throughout the world. However; the emergency extension operation system design is not unique and architectures comprising simpler systems like free-fall or spring-assisted up to more complex systems like auxiliary hydraulics-assisted or pneumatics-assisted ones can be found in different airplanes. The airplane landing gear free-fall operation comprises a redundant; dissimilar and independent mechanically operated method of extending airplane landing gear due to a main hydraulic system failure or an electrical system malfunction. This paper aims at describing the modeling and simulation of a general landing gear emergency extension system built in a test rig; for a non-assisted type system; applying only an extension by gravity. Due to the low associated cost; satisfactory results and capability of easily assessing the trade-offs between different systems configurations; modeling applying computational software has become a frequent practice in aeronautical industries with the purpose of reducing product development cycle. Therefore; a parametric model of the landing gear emergency extension system was created in MATLAB Simulink and the system performance at nominal and particular operational conditions could be predicted by running several model simulations. Afterwards; through the assistance of MATLAB tools; discrete and continuous optimization processes were accomplished to illustrate the benefits of applying these techniques to improve system operation response. An optimum damping condition permits the attenuation of the impact effects suffered by aircraft structure when landing gear falls by gravity in an emergency operation; as well as the assurance of sufficient energy for landing gear locking at the end of its downward movement

Keywords: Landing Gear; Free-Fall; Modeling; Optimization

13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Author:
Mário Maia Neto, Luiz Carlos Sandoval Góes
Title:
Test Rig Landing Gear Free-Fall System Model Simulation and Design Optimization Using Matlab
DOI:
http://dx.doi.org/10.3384/ecp1392a23
References:

[1] N S Currey. Aircraft Landing Gear Design: Principles and Practices; AIAA Education Series; Washington; 1998; p. 373. ISBN 0930403-41-X.


[2] E Kelly. Pictures: Australian General Dynamics F-111 approved for service re-entry after June wheels-up landing. Global International. July; 2006. < http:// www.flightglobal.com/news/articles/pictures-australian-general-dynamics-f-111-approved-for-service-re-entry-after-june-wheels-up-landing-208102/>.


[3] Liebherr. Landing Gear Sub System: Extension / Retraction. <http://www.liebherr.com/AE/enGB/produc ts_ae.wfw/id-14726-0>.


[4] Federal Aviation Administration. Flight Test Guide for Certification of Transport Category Airplanes. AC 25-7C. Washington: U.S Department of Transportation; 2012.


[5] M Maia Neto. Modelagem; simula√ß√£o e otimiza√ß√£o de sistemas de extens√£o emergencial de trem de pouso de aeronaves. 2011; p. 241. Disserta√ß√£o de Mestrado em Sistemas Aeroespaciais e Mecatr√īnica ‚Äď Instituto Tecnol√≥gico de Aeron√°utica; S√£o Jos√© dos Campos.


[6] E O Doebelin; System Dynamics: Modeling; Analysis; Simulation; Design. Marcel Dekker; New York; 1998; pp. 54-75; 206-255. ISBN 0-8247-0126-7


[7] H E Merritt. Hydraulic Control Systems. John Wileys and Sons; Cincinnati; Ohio; 1967. ISBN 0-471-59617-5.


[8] M Maia Neto; L C S Góes and R C M Furtado. Landing gear free-fall simulation and damping optimization using Matlab. Inverse Problems; Design and Optimization Symposium. João Pessoa; pp. 55-62; 2010.


[9] M Maia Neto; L C S Góes and R C M Furtado. Landing gear free-fall simulation and kinetic energy optimization. SAE Technical Paper Series. São Paulo; 2010; p. 14. ISSN 0148-7191.


[10]Mathworks. SimHydraulics: User’s Guide. Natick: The MathWorks Inc; v. 1.8; 2010. <http://www. mathworks. com/help/pdf_doc/physmod/hydro/hydro_ug.pdf >.


[11]Mathworks. Matlab: The Language of Technical Computing (Matlab Help). Natick: The MathWorks Inc; 2007.N 0-471-34958-5.

13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Author:
Mário Maia Neto, Luiz Carlos Sandoval Góes
Title:
Test Rig Landing Gear Free-Fall System Model Simulation and Design Optimization Using Matlab
DOI:
http://dx.doi.org/10.3384/ecp1392a23
Note: the following are taken directly from CrossRef
Citations:
No citations available at the moment


Responsible for this page: Peter Berkesand
Last updated: 2017-02-21