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结合机械振动原理方程分析计算了不同结构参数下的3自由度的1/4汽车结构的振动响应理论曲线及振动频谱图;运用激光外差技术测量原理设计搭建了汽车振动信息实验测量方案;针对外形近似、发动机输出信息相同的情况,采用视频成像法对存在识别盲点的两车进行了振动信息采集实验。通过分析采集到的振动信号的时域、频谱曲线,成功地找到了甲乙两车频谱的标志特征点,很好地对两车进行了标志与区分,弥补了视频成像车型识别法的盲点,为基于激光检测汽车振动信号的车辆识别技术提供了理论和实验基础依据。
Combined with the principle of mechanical vibration principle, the theoretical response curve and vibration spectrum of the 1/4 automobile structure with 3 degrees of freedom under different structural parameters were analyzed and calculated. The experimental measurement scheme of the vehicle vibration information was designed based on the principle of laser heterodyne measurement. Approximate shape, the same output information of the engine, the use of video imaging on the presence of two vehicles to identify the blind spot vibration information acquisition experiments. By analyzing the time-domain and frequency-spectrum curves of the collected vibration signals, we successfully found the feature points of the spectrum of A and B vehicles and marked and distinguished the two vehicles well, making up the blind spots of the video imaging vehicle type identification method. Based on the laser detection of vehicle vibration signals of vehicle identification technology provides theoretical and experimental basis.