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Volume 40 Issue 6
Jun.  2014
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Journal of Beijing University of Aeronautics and Astronautics  > 2014  >  40(6): 732-736.
Wei Xiaohui, Song Xiaochen, Li Lirong, et al. Dynamic critical friction of landing gear shock absorber binding[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(6): 732-736. doi: 10.13700/j.bh.1001-5965.2013.0418(in Chinese)
Citation: Wei Xiaohui, Song Xiaochen, Li Lirong, et al. Dynamic critical friction of landing gear shock absorber binding[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(6): 732-736. doi: 10.13700/j.bh.1001-5965.2013.0418(in Chinese)
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Dynamic critical friction of landing gear shock absorber binding

doi: 10.13700/j.bh.1001-5965.2013.0418

  • State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

  • Received Date: 17 Jul 2013
  • Publish Date: 20 Jun 2014
    Abstract
  • In order to explore the design criterion of landing gear shock absorber binding, based on the method in aircraft design manual, takeoff and landing system design, the static and dynamic critical friction coefficients of a certain unmanned aerial vehicle's main landing gear were analyzed. The analysis shows that the dynamic critical friction in yaw landing load condition and maximal spring back drag in tail sinking load condition are prone to bind. And then combined with the landing gear drop dynamic response curve, the physical meaning of shock absorber dynamic binding was studied. Research shows that the argument foundation of the dynamic critical friction analysis does not hold and oleo-damping force should not be included when calculating the critical friction coefficient. For the analysis of landing gear shock absorber binding in the state of a moment, it is more accurate that taking the method of static critical friction in aircraft design manual-takeoff and landing system design to check.

     

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