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Technology for advanced morphing structures

Başlık çevirisi mevcut değil.

  1. Tez No: 401252
  2. Yazar: MEHMET FATİH ÖKTEM
  3. Danışmanlar: PROF. GIUSEPPE SALA
  4. Tez Türü: Doktora
  5. Konular: Havacılık Mühendisliği, Aeronautical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2013
  8. Dil: İngilizce
  9. Üniversite: Politechnico di Milano (Technical University of Milan)
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 101

Özet

Özet yok.

Özet (Çeviri)

The objective of the morphing concept is to provide continuous controllable deformations thus changing the stiffness of the structure. A possible solution to design morphing structure can exploit the peculiar characteristics of chiral topologies, which are a relatively new design concept for composite aerospace materials. A honeycomb based on a chiral topology shows auxetic features which leads to negative Poisson coefficients This thesis investigates the design of a technological demonstrator of a morphing wing that uses the auxetic features of chiral cells. The research is concentrating on the manufacturing of the chiral composite cell network inside a rib. The design of the technological demonstrator is composed of two ribs connected to each other by means of corrugated flexible skin. The Leading edge (LE) and Trailing Edge (TE) provide housing for two ribs. The ribs are connected to the corrugated flexible skin by means of pin – hinge mechanisms. LE and TE are filled with a foam material to provide shear and pressure resistance. The foam material thought to be utilized is Rohacell and this material offers high strength/weight ratio. The morphing wing has the property of increasing the camber when subjected to a gust load. The aeroelastic performances have been studied in previous works, where the topology of the chiral honeycomb has been optimized. Basing on the knowledge of the aerodynamic loads this study presents the basic aspects of the technological solutions and the development of the structural design of the demonstrator. The manufacturing of the ligaments and assembly of these specific parts to form chiral cells are described. Finite element analyses are carried out based to verify the rib design and choose the best configuration. Experiments are also performed to validate the design and to verify the manufacturing techniques. The manufacturing phase started from the production of the ligaments and then assembling them in the assembly mold. The experiments were carried out on four chiral unit cells. This phase also includes the design and manufacturing of the molds of the ligaments which are used for the production of the chiral unit cells and rib. Another mold was also designed and produced for the assembly of the ligaments to form the chiral unit cell. The production of the rib started after the exploitation of the chiral unit cells was proven. The previous production phase also gave some hints on how to proceed for the assembly of the full rib which is composed of up to three hundred ligaments. Compared with the chiral unit cell, a full rib is relatively a more complex structure and more attention is needed for the assembly of the ligaments to create defect free structure. After the production phase is completed static testing was performed on the rib. That was realized by suspending loads to the nodes of the rib and measuring the deflection by means of laser and comparator. The recent technological demonstrator is designed as a passive structure but the next step of this research could employ the use of sensing elements and actuators to create a controllable aerodynamic surfaces. The researcher also investigated the possible use of sensing elements and polymeric materials that could change their shape under several stimulus effects. The best polymeric material to be utilized should include both the shape memory effect and self healing effect.

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