“Y”型果树动力学模型仿真及试验的研究

为了在研究分析果树振动特性时使问题简化,提出了用质量—弹性元件系统来建立果树力学模型的方法。为验证该方法的有效性,选择将"Y"型果树主干L0、主枝L1、侧枝L2视为3个质量块,建立三自由度果树振动模型,并运用Mat Lab中Simulink子系统封装技术对所建立的振动模型进行仿真运算,将得到的仿真结果与试验结果进行比较,得出主干L0、主枝L1、侧枝L2的加速度时域变化曲线。结果表明:仿真与试验结果吻合程度较好,建立的果树三自由度模型能够比较好地反映果树振动情况,用质量—弹性元件系统来建立果树力学模型的方法是切实可行的。同时,通过对果树共振频率的研究,确定25Hz左右为较合适的采摘激振频率,可为林果振动采摘收获机的参数优化提供必要的理论基础。

"Y"Ttype of Fruit Tree Dynamic Model Simulation and Experimental Research

When we study the vibration characteristic of the fruit trees , in order to make the problem to simplify , this pa-per puts forward with a method to builed fruit tree mechanics model with quality -elastic element systemis .To verify the effectiveness of the method , we consider the "Y"fruit tree trunk L 0 , major branch L 1 , lateral branch L 2 as three mass piece to establish three degrees of freedom of fruit trees vibration model , and by using the Matlab Simulink subsystem in packaging technology to establish the vibration model of simulation calculation , the simulation results will be compared with the test results , it is concluded that the trunk L 0 , major branch L 1 , lateral branch L 2 acceleration curves of time do-main simulation is consistent with the experimental results , the establishment of fruit trees three degree of freedom model can better reflect the fruit trees vibration situation , with quality-so elastic element system to establish the mechanical models of fruit tree method is feasible.Through the research on fruit resonant frequency around 25Hz determined to pick a more suitable excitation frequency , to provide the necessary theoretical basis for the optimization parameters fruit picking vibration harvester .