提出利用电云进行模型重构的算法，该算法基于点云的几何形状特征，很好的算法。-Proposed the use of electric cloud model reconstruction algorithm based on the geometric shape of the point cloud, a good algorithm.

作者在本文中提出了一种层析成像的正演和反演方法。首先对求解区作网格剖分, 由给定的正演速度模型在网格点上双线性插值, 获得整个网格节点的速度分布。然后, 对波阵面作一近似, 在此基础上, 用最小走时最短路径射线追踪法完成正演。反演则是通过正演的方法实现的。理论模型算例表明, 本方法效果较好。-In this article, the author proposed a forward and inversion of the tomography method. The mesh for sol

对稠密点云或者Mesh模型进行降采样，以获得更加具有代表性的模型来减少点的数量和面的个数。(The dense point cloud or Mesh model is sampled down to obtain a more representative model to reduce the number of points and the number of faces.)

以齿轮系统动力学和非线性动力学理论为基础,针对齿轮系统时变啮合刚度和齿侧间隙耦合作用的具体特点,建立了齿轮系统非线性模型,并用数值积分和数值仿真方法对其在某些参数域中进行了非线性振动研究(Based on the dynamics of a gear system and the theory of nonlinear dynamics, co nsidering characteristics of coupling action of the time-varying mesh stiffn