【摘要】 基于有限元法，对农机中常见的凸轮从动件进行瞬态动力学分析。以某型旱作播种机凸轮驱动机构为例，建立凸轮从动件有限元模型，定义45#钢的材料属性，并施加相应的边界条件与载荷，设置多个载荷步，模拟凸轮从动件在作业时的动态响应，求解凸轮从动件速度、加速度时程曲线，以及在不同时间点的位移、应力与应变分布。结果表明，凸轮从动件顶面中点和底面尖点周围应力和应变最为集中，Y方向应力、应变显著高于X、Z方向，最大应力9.57 MPa、最大应变2.98×10^-5，结构最大变形量2.08×10^-6 m。该结果为农机中凸轮从动件的可靠性评估、潜在隐患识别及结构优化提供了有效依据，有助于提升农机作业稳定性、降低故障率，并减少田间试验成本。更多还原

【Abstract】 Finite element method was used to conduct a transient dynamic analysis of cam follower commonly found in agricultural machinery.Taking cam drive mechanism in a specific dry-land seeder as an example,a finite element model of cam follower was established.Material properties for 45# steel were defined,and corresponding boundary conditions and loads were applied.By setting multiple load steps,dynamic response of cam follower during sowing operations was simulated to determine velocity and acceleration time history curves,as well as distribution of displacement,stress,and strain at different time points.Results showed that stress and strain were most concentrated around top surface midpoint and bottom surface sharp point of cam follower.Stress and strain in Y direction were significantly higher than those in X and Z directions,with a maximum stress of 9.57 MPa,a maximum strain of 2.98×10^-5,and a maximum structural deformation of 2.08×10^-6 m.This analysis have provided an effective basis for reliability assessment,potential hazards identification,and structural optimization of cam followers in agricultural machinery,contributing to improved agricultural machinery operational stability,reduced failure rates,and lower field testing costs.更多还原