Experimental study on vibration displacement for coaxial counter-rotating rotors

This paper uses the transmission mechanism of a coaxial counter-rotating rotorcraft equipped with blade designs of different airfoils. The blades are all made of aluminum alloy 6061T6. To study the deformation of the aluminum alloy blades of the rotorcraft when it hovers. It investigates the deformation and vibration displacement of the blade under the influence of aeroelasticity under the condition of fixed angle of attack and different rotation speeds. The airfoils used for study mainly consider the NACA0012 symmetrical airfoil and the other improved design Viper-X asymmetrical airfoil (A0) as test objects. The angle of attack used in the study is 10°, and the rotational speeds used are medium rotational speed ranges such as 400rpm, 450 rpm, 500 rpm, 550 rpm, and 600 rpm. A non-contact laser displacement sensor was used as the experimental measurement method for data measurement in this study. Finally, when the rotational speed exceeds 500rpm, the improved design of the asymmetric airfoil A0 is indeed more stable than the symmetrical airfoil NACA0012.