UWE Bristol Engineering showcase 2015
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Cerys Evans<br />
MEng Aerospace Design <strong>Engineering</strong><br />
Project Supervisor<br />
Dr Rui Cardoso<br />
DEVELOPMENT OF A NUMERICAL CODE FOR STRUCTURAL ANALYSIS OF<br />
WING STRUCTURES<br />
Element Types Used<br />
Wing Spar<br />
Initial implementation<br />
Pin-join bar – Truss in 2D space<br />
Displacement in the X and Y axis<br />
Developed code<br />
Pin-join bar – Truss in 3D space<br />
Displacement in the X, Y and Z axis<br />
Wing Skin<br />
Developed code<br />
Thin plate - Membrane in 2D space<br />
User Interface<br />
Main wing box analysis graphical user interface<br />
Graphical user interface for creating the<br />
structural information file<br />
Testing and Results<br />
The space truss and membrane elements were<br />
both tested and compared to literature and<br />
Abaqus CAE with very good comparison of results.<br />
When the truss and membrane elements were<br />
combined in a two dimensional structure the<br />
results were also very good to the expected results<br />
from literature and Abaqus CAE.<br />
When a three dimensional membrane element is<br />
used in, the results are not a good comparison to<br />
the expected results in the Z-axis. Twisting of a box<br />
beam is found when a load is aplied to the two top<br />
nodes on the end of the beam in the –Y-axis.<br />
Project Summary<br />
To develop a numerical code in MATLAB to analyse<br />
structural components of an aircraft wing. The code<br />
should be able to calculate the displacement, strain,<br />
stress, rotation, twist, shear flow and bending critical<br />
loads and modes.<br />
Project Objectives<br />
• Understand the finite element method<br />
• Develop and implement the stiffness matrix of<br />
wing box structural elements<br />
• Produce structural analysis of shear flows,<br />
deflection, rotation and twist angles of wing box<br />
elements<br />
• Develop a clear and easy to read visual output of<br />
the results data<br />
• Automatic saving of results data and visual output<br />
in an appropriate format<br />
• Validate code by comparison of results with<br />
Abaqus CAE<br />
• Quantitative analysis of accuracy of the of results<br />
• Critical evaluation of the developed numerical<br />
code<br />
Project Conclusion<br />
A code has been developed that uses simplex<br />
triangular elements on a membrane plate to model<br />
wing skins, and a space truss has been implemented<br />
to model wing spars and ribs.<br />
The membrane and truss elements work well<br />
individually and together on any two dimensional<br />
plane. The code does not work for three dimensional<br />
membrane elements.
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