中文摘要：

圆锥指数仪是农业上用于测量土壤压实度的专用设备。基于机／电能量守恒原理，定量分析了测量过程中直流电动机输出功率与锥杆作用力之间的能量传递关系，提出了一种根据电动机电流来测量土壤圆锥指数的方法。试验结果证实了该方法的可行性。

英文摘要：

Cone index penetrometer is a special apparatus widely used for assessing soil compaction in agriculture. In this paper a current sensor was used to determine soil cone index. Unlike that of the conventional penetrometer, the measurement principle was based on the energy transformation of the output power of DC motor and the penetration force. In order to better understand this method, a theoretical analysis was discussed in terms of the penetrating process. Furthermore, a laboratory test was conducted and the results demonstrated that the method can be employed to renovate the conventional penetrometers.