Authors

Abstract

Vibratory harvesting is to dislodge fruits by applying excitation force to fruit trees, so the vibration response characteristics of fruit trees are of great significance for vibratory forest and fruit harvesting machinery to realize efficient harvesting. The effects of different clamping points and vibration frequencies on vibration responsiveness and energy transfer in Broussonetia papyrifera branches are investigated in this study. The results show that the effects of different clamping point positions and vibration frequencies on the branch vibration response are mutual. The ideal distance between the clamping point position and the base of the main branch should be between 48% and 73% of the branch length, and the distance between the clamping point position and the base of the main branch increased with the increase of vibration frequency. This is because, when the clamping point is close to the base of the main branch, a higher excitation frequency increases the energy consumption at the base of the main branch, and the amount of ineffective vibration energy transferred to the base of the main branch also increases. Therefore, when the location of the clamping point is close to the base of the main branch, the suppression of high-frequency vibration at the base of the main branch is stronger than the suppression of low-frequency vibration. When the clamping point is located in the center of the branch, the overall response of the branch to vibration is better.

Abstract in English

振动采收是通过对果树施加激振力使果实脱落，因此果树的振动响应特性对振动林果采收机械实现高效采收具有重要意义。本研究探讨了不同夹持点和振动频率对构树枝条振动响应和能量传递的影响。结果表明，不同夹持点位置和振动频率对枝条振动响应的影响是相互的。理想的夹持点位置与主枝基部之间的距离应为枝条长度的 48% 至 73%，夹持点位置与主枝基部之间的距离随着振动频率的增加而增加。这是因为，当夹持点靠近主枝基部时，较高的激振频率会增加主枝基部的能量消耗，同时传递到主枝基部的无效振动能量也会增加。因此，当夹持点位置靠近主枝基部时，对主枝基部高频振动的抑制作用强于对低频振动的抑制作用。当夹持点位于树枝中心时，树枝对振动的整体响应效果较好。