Numerical Investigation of a Slider Canopy Locking Mechanism

Creative Commons License

İpekoğlu F., Orhan S.

4thInternationalCongress of Engineering and Natural Sciences (ICENSS 2024), Ankara, Türkiye, 24 - 25 Mayıs 2024, sa.71374, ss.986-994, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Ankara
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.986-994
  • Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
  • Ankara Yıldırım Beyazıt Üniversitesi Adresli: Evet

Özet

Slider   mechanisms,   providing   an   alternative   to   conventional   tilt-up   mechanism interfaces in aerospace applications, are highly preferred in aviation structures because of their lightweight design, extended maintenance intervals, and improved fatigue life.On the other hand, geometric tolerances between components are crucial for the proper assembly  of  the  sliding  mechanism.  Particularly,  precise  placement  of  bearings  and  slides ensures smooth operation of the mechanism.Impact  forces  are  a  known  source  of  concern,  as  they  not  only  increase  vibration amplitude but also reduce system reliability, stability, life, and precision.In  this  study,  three  different  mechanism  models  of  a  closed  and  fully  locked  sliding canopy mechanism under the static loads were designed, and the displacements and stresses corresponding to eccentricity were investigated by the finite element method.The first model studied was equipped with a fixed pin structure. However, applying the fixed model to such a sliding system requires narrow tolerances, and these narrow tolerances are  only  available  with  a  special  tool  design  for  assembly  process.  Deviations  in  tolerances during  mechanism  operation  may  require  an  extra  trimming  process  for  the  pin  diameter. However, the reduction in pin diameter leads to a loss of rigidity and a decrease in the load-bearing  capacity.  This  leads  to  critical  fatigue  life  and inability  to  fully  absorb  loads  in  the opposite direction on the structure.As the second model, an eccentric pin composed of a single web was considered due to its  simpler  and  more  feasible  application,  design,  and  manufacturing  compared  to  other solutions. In  the  third  model,  a  design  with  a  double  web  whose  front  web  was  designed  in accordance  with  the  eccentric  pin  was  discussed.  With  this  design,  it  was  thought  that  the double web solution would be effective against the moments applied to the pin body.