“Y”型果树动力学模型仿真及试验的研究

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

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。

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 L0, major branch L1, lateral branch L2 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 L0, major branch L1 , lateral branch L2 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.