Propeller Design and Modal Analyses

    In order to determine the natural frequency,pre-stress and stress-free behaviors of a five-bladed propeller, Ansys-Modal was used. Firstly, the propeller was designed and rendered in solidworks (basically-not detailed propeller datas), then it was set up in modal program. 6 natural frequencies were obtained. Rotational accelerations were added as increasing of 20 rpm values between 100 to 2000, stress and total deformation were calculated. When rpm of propeller increase, stress and deformation values increase as well. When the frequency of propeller and the calculated natural frequency of propeller are compared, no resonance risk determined at the design rpm value-600 rpm. However, at higher rpm values above 1200 rpm resonance can occur due to the coincidence of frequencies.The figures belove demostrate the natural frequencie (table-11), stresses-time (figure-4), total deformation-time (figure-5), rpm-time (figure-3).