Abstract:

With the increasing number of foreign trees introduced into landscape greening construction in various regions， wrapping cold resistant trees with bandages is an important measure to avoid frostbite in cold weather. In order to achieve efficient， high-quality and low energy consumption in bandage wrapping， this article calculated the optimal overlap of bandages， designed and optimized the parameters of the circular winding mechanism. A bandage model was established using the discrete element method， and the heat conduction module in EDEM was used to simulate the heat transfer of tree trunks at an ambient temperature of -19 ℃（253 K） for 8 h， multiple sets of different bandage overlaps were set， and the bandage overlap required for tree trunks not to be frostbitten was obtained as 1/2. Solid works software was used to model the C-shaped rotating ring， a key component of the winding mechanism， and the model was imported into ADAMS for dynamic simulation of winding rotation. A response surface test was designed based on the design factors of ring width， ring thickness， and modulus， with the stress and mass as the response values. Based on the data obtained from ADAMS simulation， a regression equation for stress and mass was constructed and variance analysis was performed on the experimental data to obtain the optimal structural parameters： ring width of 109.352 mm， ring thickness of 70 mm， modulus of 4.5 mm. Under this parameter combination， the stress was 15.589 MPa and the mass was 51.905 kg. The feasibility of kinematic simulation and optimization design was verified through verification test and prototype test. The above results provided some references for the design and development of tree insulation protection and bandage wrapping devices.

Key words: tree insulation, bandage, thermal energy analysis, ADAMS, response surface methodology

摘要：

随着各地风景绿化建设引入外来树木数量的增多，对不耐寒树木进行绷带包裹是避免其在寒冷天气下冻伤的重要举措。为实现绷带包裹的高效、高质量和低能耗，计算了绷带最优重叠量，设计了环形缠绕机构，并优化了参数。通过离散元法建立绷带模型，借助EDEM中的Heat Conduction模块对树干在-19 ℃（253 K）的环境温度下进行8 h的热传递仿真，设置多组不同绷带重叠量，得到树干不被冻伤所需的绷带重叠量的最小值为1/2。利用Solid Works软件对缠绕机构关键部件C形转动环进行建模，将模型导入ADAMS进行缠绕转动的动力学仿真。以环宽、环厚和模数为设计因素，以所受应力和质量为响应值，设计响应面试验方案。根据ADAMS仿真得到的数据，构建应力和质量的回归方程并对试验数据进行方差分析，得到最优结构参数：环宽为109.352 mm、环厚为70 mm、模数为4.5 mm，此参数组合下应力为15.589 MPa、质量为51.905 kg。通过验证试验和样机试验证明了运动学仿真和优化设计的可行性。以上研究结果可为树木保温防护和绷带缠绕装置设计研发提供一定参考。

关键词: 树木保温, 绷带, 热能分析, ADAMS, 响应面法