（School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China）


Abstract: Aiming at the problem of setting the frequency range of vibration friction welding machine in the welding process, the electromagnetic vibration system in vibration friction welding machine were studied. The relationship between the frequency of external excitation force and the natural frequency of damped forced vibration system was summarized, electromagnetic vibration system based on Matlab in modeling and simulation was proposed. The simplified model of electromagnetic vibration system was established, and the model of electromagnetic vibration system was analyzed by Matlab. The relationship between vibration frequency, amplitude and voltage of the electromagnetic vibration system was tested by using the vibration friction welding test bench. The results indicate that the vibration energy of the electromagnetic vibration system is the largest near the resonance point, the amplitude is about 0.3 mm, and the corresponding frequency is about 227 Hz, which provides a basis for the frequency setting of the vibration friction welding machine.
Key words: electromagnetic vibration system; model; frequency; simulation