中文摘要：

割草机刀盘的旋转变形是导致其产生机械振动噪声的主要因素之一。利用高速数码摄像机分别拍摄了割草机刀盘在无保护端盖和有保护端盖状态下的旋转变形图像,获得了刀盘的高速旋转变形曲线,分析了产生变形的原因;并在试验的基础上建立了刀盘的有限元模型,通过ANSYS分析软件,模拟了刀盘的径向变形情况,分析了径向变形与刀盘结构和电动机转速之间的关系。减小刀盘大孔面积能使刀盘最大径向位移减小（在12000 r/min时,减小约30%）;维持电动机转速在8000 r/min左右,可使最大径向位移不超过0.2 mm,刀盘运转平稳。

英文摘要：

The cutter＇s rotating deformation plays an important role which caused the vibration noise of grass trimmer.High-speed video camera was applied to get the deformation images of grass trimmer＇s cutter with protecting cover and without it.The tendencies and reasons of deformation were proposed.The finite element model of cutter based on experiment was established,the radial deformation was simulated by ANSYS,and the relations of the radial deformation between the cutter structure and rotational speed were analyzed.Reducing the area of big hole in the cutter could decrease the maximum radial deformation（in 12000r/min,the value decreased by about 30%）;Maintaining the motor speed at 8000r/min around could control the maximum radial deformation below 0.2mm and keep a smooth moving.