Abstract
In order to improve the vibration of a 125 Motorcycle, the structural dynamic characteristics of its body were analyzed. The results showed that the first six order natural frequencies were relatively low and large deformation exists on the rear. In combination with the analysis results, the influence of road irregularity and engine excitation on the vibration of the 125 motorcycle body was discussed. It was found that the first order reciprocating inertial force excitation of the engine goes in the same direction and has frequency coupling with the first order vertical bending, which was likely to cause the resonance of the car body. Based on the vibration pattern analysis of the car body, the improvement scheme of increasing the wall thickness of the supporting pipe as well as thickening the rear reinforcement pipe was put forward. The structural dynamic characteristics of the modified body were analyzed using analytical methods. The result demonstrated that the vertical bending frequency greatly increased, keeping away from the excitation frequency of the first order reciprocating inertial force of the engine, on the other hand, the vibration mode of the rear part was also improved. The effectiveness of the improvement plan was also validated by prototype test drive.
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