分析了不同车速工况下车内噪声的分布状况及主要频率成分。
Analyze the distribution of internal noise and main frequency ingredient with different speed.
平地效应使干涉纹图中的主要频率不在零频，不能反映实际地面高程的变化。
The flat-earth makes the main frequency of the interferogram not at the zero frequency, and can't reflect the change of the topographic altitude.
目的：建立心血管变异性的数学模型，探讨变异性频谱的主要频率成分机理。
Purpose: To establish a simple mathematical model for investigating the mechanism of frequency components in cardiovascular variability.
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