Abstract:

The highaccuracy parameterized involute spur gear model was established by using Pro/e software. Based on the engineering bionics and the finite element theory, the effect of the bionic surface morphology on the improvement of the dynamic performances of the gear was analyzed using MSC.Nastran software. By comparison of the modal analyses of ordinary gear and the gear with bionic surface morphology, the anterior 10 ranks of natural frequencies and mode shapes were calculated. The results show that the maximum amplitude of any rank of the anterior 10 ranks of the gear with bionic surface morphology is smaller than that of the ordinary gear. The natural frequency of the gear with bionic surface morphology decreases obviously and the trend of the natural frequency is much smoother than that of ordinary gear. The dynamic characteristics and the reliability of the gear have been ameliorated effectively.

Key words: engineering bionics;spur gear;natural frequency, bionic surface morphology, modal analysis