Abstract: In order to protect the commercial forest resources and forest ecological environment in the north, people expanded the cutting of southern Eucalyptus plantation. For better harvesting the plantation, it is necessary to clean up the forestland before harvesting. So this paper designed and studied a new type of clearing device for forestland. The woodland cleaning device was mainly composed of cutter shaft, cutter head, cutter, etc.. The working head structure of forest clearing device was determined through analyzing the measurement data of tree spacing, weed and shrub species, shrub diameter and shrub density in the study area. Using the measured data, this paper analyzed and determined the key parameters: dimension parameters of the tool shaft, cutter head and cutter, speed of tool shaft and power consumption; and built SolidWorks model of forest land cleaning device. By transient analysis function of ANSYS, this paper simulated and analyzed the cutting tool, and made clear that the instantaneous stress and strain of cutting tool in cutting shrubs were well. ANSYS and Adams were used to analyze the model and dynamic balance of tool shaft, proving that the design of speed and size of tool shaft was reasonable. The results of analyzing cutter deformation indicated that cutter design was reasonable and within the prescribed range. Finally, the dynamic balance test of the cutter shaft and shrub cutting experiment on the prototype were all carried out. The results showed that the maximum effective vibration speed of cutter shaft was 0.13 mm/s and the maximum noise was 87.7 dB. The prototype could successfully cut within 16 shrubs, meeting all relevant standards and design requirements. The simulation and experimental results proved that the key parameters were correct and designed clearing device could complete the scheduled clearing work.

Key words: Eucalyptus, plantation, woodland cleaning device, structural style, key parameters, simulation analysis, experimental verification

摘要： 为保护北方商业林资源及森林生态环境，人们加大了对南方桉树人工林的采伐。为更好的进行人工林采伐工作，需进行伐前林地清理，就此情况进行设计和研究新型清林装置。清林装置主要由刀轴、刀盘、刀具等组成。通过对研究区林木间距和杂灌种类、灌木直径、灌木密度等测量数据的分析处理确定了清林工作头的结构形式。利用测量数据对刀轴、刀盘和刀具的尺寸参数和刀轴转速，分析确定了消耗功率等关键参数并进一步对清林装置进行SolidWorks建模。利用ANSYS的瞬态分析功能，对刀具进行了仿真分析，明确了刀具在切削灌木的瞬间应力应变情况良好。应用ANSYS和Adams对刀轴进行了模态分析和动平衡分析，证明刀轴转速和刀轴尺寸设计是合理的。刀盘形变分析结果表明，在规定范围内，刀盘设计合理。最后对刀轴进行动平衡测试，对样机进行灌木切削实验，结果显示刀轴振动速度有效值最大为0.13 mm/s，最大噪音为87.7 dB，样机可对16根以内灌木进行成功切削，都符合相关标准和设计要求。仿真及实验结果证明了所确定的关键参数是正确的，也证明了所设计清林装置是可以完成预定清林工作的。

关键词: 桉树, 人工林, 清林装置, 结构形式, 关键参数, 仿真分析, 实验验证