提出一种基于FFT与DFT相结合的频域分析方法,对采集到的汽车振动信号进行分析,从而提取发动机的转速信息.实车测试验证了该方法的可行性与有效性.最后基于发动机转速的高阶频率,对所提取的发动机转速进行修正,取得了很好的效果.
A frequency domain analysis method based on the combination of FFT and DFT is proposed,with which the vibration signals of a vehicle collected is analyzed and the information of engine speed is extracted.The results of real vehicle test verify the feasibility and effectiveness of the method.In the end the engine speed extracted is corrected based on the high-order frequencies of engine speed.