Abstract: Take one micro-vehicle’s transmission shaft as the research object, and based on Euler-Bernoulli beam theory, the differential equation of single shaft pipe with different lengths and shaft pipes with different length matching are built. Natural bending frequency and corresponding first critical speed is calculated, which is verified that the maximum rotational speed of researched transmission shaft is lower than the first critical speed, as a result, it can avoid resonance. To confirm the best kinetic performance series, five prototypes of transmission shaft are built, and analyze their kinetic performance, which will give a theoretical basis and simulation reference for the length matching of shaft pipe.

Key words: shaft pipe, Euler-Bernoulli beam theory, length matching, virtual prototype