手扶插秧机手传振动评价及振动传递特性试验

Hand vibration transmission evaluation and vibration transmission characteristics test of hand-held rice transplanter

以某手扶插秧机手柄和接振人员手臂为研究对象,采用基于振动总值的日振动暴露量的评价方法对手扶插秧机在2种不同工况下的手传振动进行了复合试验评价,计算结果显示,该手扶插秧机日振动暴露量为2.442 m/s^2,满足欧盟指令规定的要求。对人体手臂进行了振动响应分析和振动传递特性分析,结果表明,在2种工况下手扶插秧机手柄处的振动传递到手臂上时,振动呈逐渐衰减的趋势;操作手扶插秧机时,手腕对振动能量的吸收最多;手部对8~16 Hz和100 Hz附近的振动能量吸收较差,考虑到100 Hz左右的中频振动是造成雷诺氏症的主要原因,因此,100 Hz左右的中频振动应为今后插秧机扶手振动研究控制的重点。

Taking the handle of a hand-held rice transplanter and the arm of a vibration receiver as the research object,the hand-transmitted vibration of the hand-held rice transplanter under two different working conditions was evaluated by using the method of daily vibration exposure based on the total vibration value.The results of calculation showed that the daily vibration exposure of the hand-held rice transplanter was 2.442 m/s^2,meeting the requirements of the EU directive.The results of analyzing the vibration response and transmission characteristics of human arm showed that when the vibration at the handle of the hand-held rice transplanter was transmitted to the arm under two working conditions,the vibration was gradually attenuated.When operating the hand-held rice transplanter,the wrist absorbed the most vibration energy.The hand had poor absorption of vibration energy around 8-16 Hz and 100 Hz.Considering that the middle frequency vibration around 100 Hz is the main cause of Raynaud’s disease,the medium frequency vibration of about 100 Hz should be the focus of research and control of the hand-transmitted vibration of the transplanter in the future.