Y型果树动力学模型假设与分析

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The analysis on fruit trees ＇ vibration mechanical model is the foundation of the research on fruit trees＇ vibra- tion mechanical characteristics. The mechanical model is analyzed in the case of free vibration of Y-trellis trees （fruit trees＇ trunk turn to be tree limbs ） which is in from external load and forced vibration of Y-trellis trees which is under vibration forces. In reference to the morphological characteristics of Y-trellis trees, by simplifying the model , then the ing the model to be unaltered, the vibration mechanical model of Y-trellis trees＇ forced vibration is established, then the vibration differential equation is established and the methods of solving differential equation is given, thus , the expression of vibration function and the dynamic response of Y-trellis trees＇ forced vibration is given, which provides the theoretical data for the research on fruit trees＇ dynamic characteristics and setting working parameters of vibration harvest machine.果树振动动力学模型分析是果树振动动态特性研究的基础。通过对Y型果树（变侧主干形果树）在不受外部载荷作用下的自由振动及受激振力作用下的受迫振动,进行动力学模型分析;在参考Y型果树形态特征的前提下,对模型进行简化,建立振动微分方程,并给出求解微分方程的方法,得到了Y型果树自由振动下振型函数的解析解表达式及系统的各阶响应。在此基础上,对模型进行等截面处理,建立Y形果树受迫振动的动力学模型,对其建立微分方程,给出求解微分方程的方法,得到了Y型果树受迫振动下振型函数的解析解表达式及受迫振动的各阶响应,为果树动态特性研究和果树振动采收机械的工作参数设定提供理论数据。