In order to study the dynamic performance of main frame of electric bicycle

it is analyzed that the modal behaviour of the main frame of an electric bicycle with complete suspension.The finite element model of the main frame is built by using ANSYS software

and the modal frequencies and vibration types are analyzed.The FEA results are in accordance with those obtained from experiments.By using the modal sensitivity analysis technology

as well as taking the vehicle vibration characteristics into account

the relationship between the thickness of each component of the main frame and the first-order modal frequency is investigated.The results show that the vibration performances of main frame can get better with the optimization of component thickness parameters.It provides a theoretical basis for the dynamic analysis of electric bicycle.