介绍了机车在水阻试验中柴油机转速信号的测取方法,此方法利用主发电机整流电压的脉动频率转换为转速的原理,方法简单,测量准确。 This paper introduces the method of locomotive diesel engine speed signal measurement in water resistance test. This method uses the principle that the pulsating frequency of the rectified voltage of the main generator is converted to speed. The method is simple and the measurement is accurate.