*Aerodynamics*

waiting time of 5 s (average of about 1000 instant values) using the Keyence pressure measurement. The standard deviation of the Keyence pressure measurement errors was within 0.001 Pa. Moreover, flutter of wing was captured with help of high performance camera.

At T0 instant, the normal stress had important value near the wing tip. During flutter behaviors of wing, this important normal stress propagated from the tip of the wing to the root of the wing. The maximum value of the normal stress was

With the same airfoil, the rectangular wing was found to be more distorted and have higher maximum deformation and higher maximum normal stress than the trapezoid wing. Thus, 3D-shape wing contributed significantly to the deformation

With the same 3D-shape wing, the maximum deformation and maximum normal stress of NACA65A004 rectangular wing were higher than those of the rectangle supercritical wing. Meanwhile, the maximum deformation and maximum normal stress of NACA65A004 trapezoidal wing were less than those of the supercritical trapezoidal wing. It could be concluded that the 3D shape of wing played an

**Wing IBM method (mm) Experiment method (mm) Relative error (%)**

NACA65A004-rectangular 0.119 0.131 9.7 NACA65A004-trapezoidal 0.030 0.033 8.6 Supercritical-rectangular 0.035 0.039 9.9 Supercritical-trapezoidal 0.034 0.037 9.2

found out at the root of the wing and at T2 instant.

*DOI: http://dx.doi.org/10.5772/intechopen.91748*

*Research on Aeroelasticity Phenomenon in Aeronautical Engineering*

of wing when aeroelasticity phenomenon occurred (**Table 7**).

important role in the durability of the structure (**Table 7**).

**Figure 18.**

**Table 7.**

**73**

*Instant normal stress—Trapezoidal wing.*

*Maximum deformation of the wing tip.*
