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建立摩托车车架三维有限元模型,计算得到前七阶模态频率和振型,并和实测的实验模态进行对比,依据动态响应分析对车架货架加强板和车头管加强板进行改进,并对改进前后的车架进行模态分析和对比。结果表明,和实验相比,样车的有限元模型模态频率误差最大仅为-6.64%,不超过7%,改进后的前十阶模态频率有了较大幅度的提高,最大达25.73%,发生在第六阶,最小也提高了11.23%,发生在第三阶,整车振动性能得到很大提高。
The three-dimensional finite element model of the motorcycle frame was established, the first seven modal frequencies and vibration modes were calculated, and compared with the experimental mode measured. Based on the dynamic response analysis, the frame reinforcement plate and the front pipe reinforcement plate were improved, The modal analysis and comparison of the frame before and after the improvement were made. The results show that the modal frequency error of the finite element model is only -6.64% and less than 7% compared with the experimental ones, and the improved first ten modes modal frequencies have been greatly improved up to 25.73 %, Occurred in the sixth order, the minimum also increased by 11.23%, occurred in the third order, the vehicle vibration performance has been greatly improved.