Structural Design Of Side-by-side Helicopter Wing

The side-by-side helicopter has more stability and higher take-off weight than conventionalsingle-rotor helicopter with tail rotor. The side-by-side helicopter wings need to under take heavy loadand require high ratio of stiffness to weight. Thus it is very important for the development ofside-by-side helicopter to study wing structures with high ratio of stiffness to weight.The stiffened thin-walled structures are characterized by shells which are integrally stiffened by aseries of ribs or stiffeners arranged in combinations of lateral, longitudinal and angular patterns. Suchconfigurations possess excellent resistence to damage, delamination and crack propagation whileexhibiting high ratio of stiffness to weight. In aerospace, the stiffened thin-walled structures arecommonly used in fuselage structures, wing structures and space vehicle structures.Considering the loading characteristics of wing and the potential advantages of stiffenedthin-walled structures, by means of the finite element method, the design method for using stiffenedthin-walled structures for the wing of side-by-side helicopter is investigated in this thesis. At first, theCatis and Ansys was employed to creat the models of wing of side-by-side helicopter with wing spanstiffeners and orthogonal stiffeners; Then, the analytical solution code Ansys was used to calculate thestructural behaviors of these wings under bending and torsional loads to get their ratio of stiffness toweight; The ratio of stiffness to weight of these wings were compared and analyzed; Finally, theAnsys was used to calculate modal of these wings to obtain the frequencies and modes of vibration. Itis demonstrated that the stiffened thin-walled structures can be used for the wing for side-by-sidehelicopter and increase the ratio of stiffness to weight of wing effectively.