风筛式清选装置上物料的非线性运动规律  

Nonlinear motion law of material on air-and-screen cleaning mechanism

作　　者：李耀明[1] 赵湛[1] 陈进[2] 徐立章[1] 

机构地区：[1]江苏大学江苏省现代农业装备与技术重点实验室,镇江212013 [2]江苏大学机械工程学院,镇江212013

出　　处：《农业工程学报》2007年第11期142-147,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：江苏省农业科技攻关项目(BE2005302)

摘　　要：根据联合收割机风筛式清选装置的工作情况,建立了物料与简谐振动筛面的碰撞运动模型,推导出n-1周期运动的二维Poincaré映射。以振动频率为控制参数,计算得到映射Jacobi矩阵特征值的变化曲线,根据其穿越复平面单位圆的位置,分析了映射不动点的稳定性,获得了碰撞运动通过典型的倍周期分岔通向混沌的过程。给出了系统运动状态与工作参数的关系,并通过数值模拟验证了理论分析结果。获得了清选筛面上物料的非线性运动规律,为风筛式清选装置的结构调整和参数优化设计提供了理论依据。Based on the analyses with actual working conditions of air-and-screen cleaning mechanism in combine harvester, a vibro-impact motion model of material on harmonic vibration sieve was established and then a two- dimensional Poincar6 map of n-1 periodic motion was derived. With the increase of vibration frequency, the variation process of Jacobi matrix eigenvalue was calculated. According to the position of eigenvalue crossing the unit circle in the complex plane, the stability of fixed point of the map was discussed and the route from periodic motion to chaos via period-doubling bifurcation was received. The system motion states dependence on working parameters were provided and the results were numerically simulated. The theoretical basis of nonlinear motion law of material on vibration sieve which is beneficial to adjustment of cleaning mechanism structure and optimization of working parameters was perfected.

关 键 词：风筛式清选装置 碰撞运动模型 POINCARÉ映射 倍周期分岔 混沌 

分 类 号：S226.5[农业科学—农业机械化工程] O322[农业科学—农业工程]