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运用变质量系统的基本原理，建立轴流脱粒过程中谷物运动的非线性动力学模型。
Based on the principle of a varied mass system, the non linear mathematical model of the crop mechanics for an axial threshing process was set up.
重点考虑后坐部分变质量、多体动力学方程与内弹道方程的耦合等因素。
Some important factors are considered, which include variable mass of recoiling parts and coupling between multi body dynamic equations and interior ballistic equations.
其中某些方程可用于研究变质量非完整系的相对运动动力学。
Some of the equations can be used to investigate the dynamics of relative motion of non-holonomic system with variable mass.
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