MODAL AND HARMONIC ANALYSIS OF AIRCRAFT WING

Modal analysis is as important as carrying out a static structural analysis, because our aircraft will always experience exposure to different gust wind (which can cause turbulence) and vortex with different force frequency. If our structure is not properly design to with stand such frequencies (i.e. for the force frequency not to be equal to the natural frequency of our structure), it will lead to catastrophic failure of the structure. Natural frequency of structure will vary, depending on three key parameters. Which is the shape of the structure (stiffness/aero elasticity), the material used in the structure and its damping ratio. We know that the higher the response of our structure to force frequency, the lower is its natural frequency, while damping ratio tend to increase The Study is to be carried in different comparison cases, in other to obtain a better structural result. The function of stringers and spars, the longitudinal stiffeners in the wing. The designing of spars in a wing is also shown with the help of screenshots in CATIA V5 software. Load representative of an aircraft will be considered in this study.