玉米茎秆往复切割力学特性试验与分析

为了研究玉米切割器切割茎秆的切割力与切割功耗，提高切割性能，研制了摆切式茎秆切割试验台。采用悬臂梁称重传感器、高频数据采集卡和LabVIEW软件组成的测试系统进行切割力学性能影响因素试验研究。根据测得的切割力连续变化曲线求得切割功耗，并分析了削切角、切割速度、切割位置、茎秆外皮与节点等因素对切割力及功耗的影响。试验结果表明：峰值切割力和切割功耗随着切割速度的增大和切割位置的增高而逐渐减小，且在削切角为20°左右时较小，切割性能较好；峰值切割力和切割功耗在节点处比节间增加56%，外皮所需切割力占63%～83%。该研究为提高切割器的切割性能提供了理论依据。

Experiments and analysis on mechanical property of corn stalk reciprocating cutting

In order to reduce the cutting force and power consumption and improve the cutting property, a cornstalk cutting test-rig composed of mechanical equipment and measurement system was developed. Then a cantilever weigh sensors, a high frequency digital acquisition card and the software of LabVIEW were applied in the measurement system. Cornstalk experiments were carried out on the test-rig. According to the measuring cutting force, the cutting power consumption were calculated, and the influence of cutting angle, cutting speed, cutting position, the epidermal and node of cornstalk on the cutting force and consumption were analyzed. The better cutting property and the smaller values of cutting force and consumption were obtained with the cutting angle closed to 20°, with the increasing of cutting position and speed, the peak cutting force and the cutting power consumption were both decreased gradually. The epidermal cutting force accounted for about 63%-83%, and the cutting force for the node increased about 56% compared with that for the internode. The research can provide theoretical basis for improving the cutting property.