电圆锯是重要的林间锯割作业工具，圆锯片振动特性直接影响了电圆锯的使用寿命和安全操作。为了便于圆锯片的安装和拆卸，圆锯片通过轴孔间隙配合与刀架进行连接，这种配合方式不能使用简支或者固支边界条件进行准确的表述。在具有随动坐标系的绝对节点坐标法（absolute nodal coordinate formulation, ANCF）框架下，利用空间环扇单元建立高速柔性高速旋转柔性圆锯片模型，并引入含径向间隙的弹簧约束单元对间隙配合边界条件进行模拟，考虑旋转运动中广义离心力和克氏力，根据达朗贝尔原理建立高速旋转柔性圆锯片模型的非线性动力学微分方程。通过与其他文献进行对比，验证高速旋转柔性圆锯片模型的有效性，并分析配合间隙，旋转速度和几何形状对圆锯片振动特性和临界转速的影响。

The electric circular saw is an important tool for forest sawing operations, and the vibration characteristics of the circular saw directly affects its service life and safe operation. In order to facilitate the installation and disassembly of the circular saw, the circular saw was connected to the tool holder through a clearance fit between the shaft holes. This fit cannot be accurately expressed using simple supported or clamped boundary conditions. Under the framework of the absolute nodal coordinated formula (ANCF) with a follower coordinate system, the high-speed flexible circular saw model was established by using spatial annulus sector elements, and spring constraint elements with radial clearance were introduced to simulate the boundary conditions of clearance fit. Based on the Darrell principle, taking into account the generalized centrifugal and Coriolis forces in rotational motion, the nonlinear dynamic differential equation of the circular saw model was established. By comparing with other references, the validity of the circular saw model was verified. The influences of fit clearance, rotational speed, and geometric shape on the vibration characteristics and critical speed of the circular saw were analyzed.