摘要：【中文】本发明公开了一种面向平面散点数据的沿流向沟槽叶栅自动生成方法，输入数据为吸力面和压力面上截取的两条曲线的散点数据，先将散点按照逆时针的顺序连接，得到多边形用于表示叶栅的平面轮廓；计算多边形的每一条边的向外的法向量，取每一个顶点所在的两条边的法向量，计算出顶点的向外的法向量；设置沟槽深度，将多边形各顶点沿法向量平移沟槽深度，得到沟槽最凸处的平面投影多边形；根据沟槽的形状和深度计算出每一层的点的三维坐标，将相邻层的点连接成三角面片；最后将两个底面的平面多边形三角剖分，得到布置有沿流向沟槽的叶栅三角网格模型。实验结果表明，本发明的方法能够在叶栅上画出高精度的沟槽，且计算效率高。 【EN】The invention discloses a method for automatically generating a blade cascade along a flow direction groove facing to plane scattering point data, which comprises the steps of inputting scattering point data of two curves intercepted on a suction surface and a pressure surface, connecting the scattering points according to a counterclockwise sequence to obtain a polygon for representing a plane outline of the blade cascade; calculating an outward normal vector of each edge of the polygon, taking the normal vectors of the two edges where each vertex is located, and calculating the outward normal vector of the vertex; setting the depth of the groove, and translating the depth of the groove along the normal vector at each vertex of the polygon to obtain a plane projection polygon at the most convex position of the groove; calculating the three-dimensional coordinates of the points of each layer according to the shape and the depth of the groove, and connecting the points of the adjacent layers into a triangular patch; and finally triangulating the plane polygons of the two bottom surfaces to obtain a cascade triangular mesh model with flow direction grooves. Experimental results show that the method can draw high-precision grooves on the blade cascade and is high in calculation efficiency.

摘要：【中文】本发明公开了一种基于对数几率函数的数控加工的进给率规划方法，定义进给率调整因子为误差限制与计算误差之比的二分之一次方，取等间隔的参数序列，对每个参数依照弓高误差限制，不断利用调整因子调整得到最终进给率；定义判别值为前后差分之间差的绝对值，计算已知参数处的判别值，判别值较大时为所求拐点，拐点、起始点和终止点将曲线分为若干段，每段为加速、减速或匀速过程；利用Sigmoid函数做加减速过程的进给率控制，按照加速度、加加速度及光滑性要求求出适应该过程的进给率表达式；使用前向扫描过程和后向扫描过程将加减速过程拼接起来。上述方法能在保证加速度和加加速度的前提下降低加工误差，实现连续的进给率规划。 【EN】The invention discloses a feed rate planning method for numerical control machining based on a logarithmic probability function, which defines a feed rate adjustment factor as a half power of the ratio of error limit to calculation error, takes an equally spaced parameter sequence, and obtains a final feed rate by continuously utilizing the adjustment factor to adjust each parameter according to the bow height error limit; defining a discrimination value as an absolute value of the difference between the front difference and the rear difference, calculating the discrimination value at a known parameter, wherein the discrimination value is a calculated inflection point when being larger, the inflection point, the starting point and the end point divide a curve into a plurality of sections, and each section is an acceleration, deceleration or uniform speed process; utilizing a Sigmoid function to control the feed rate in the acceleration and deceleration process, and solving a feed rate expression suitable for the process according to the requirements of acceleration, acceleration and smoothness; the acceleration and deceleration processes are spliced by using a forward scanning process and a backward scanning process. The method can reduce the processing error on the premise of ensuring the acceleration and the jerk, and realize continuous feed rate planning.

摘要：【中文】本发明公开了一种面向叶片的基于热扩散的沟槽型减阻结构自动生成方法，针对三角网格叶片模型，在叶片表面自动布置大量微尺度沟槽。首先，寻找叶片的三角网格模型中每个顶点所在的三角面片，根据各三角面片的法向量，通过加权平均计算每个顶点对应的法向量；然后，选定任一边界，该边界的顶点为起点，利用热扩散方程求解其他各顶点到起点的测地距离；最后，根据沟槽形状、尺寸和间距，综合各测地距离，计算每个顶点沿着对应的法向量方向移动的距离，顶点坐标修改完毕后的三角网格即为带有沟槽型减阻结构的叶片。实验结果表明，本发明提供的上述沟槽型减阻结构自动生成方法，能够在叶片上布置较高精度的沟槽，且计算效率高、算法的鲁棒性好。 【EN】The invention discloses a blade-oriented groove type resistance reducing structure automatic generation method based on thermal diffusion. Firstly, searching a triangular patch where each vertex is located in a triangular mesh model of the blade, and calculating a normal vector corresponding to each vertex through weighted average according to the normal vector of each triangular patch; then, selecting any boundary, taking the vertex of the boundary as a starting point, and solving geodesic distances from other vertexes to the starting point by using a thermal diffusion equation; and finally, according to the shape, the size and the distance of the grooves, the geodesic distances are integrated, the moving distance of each vertex along the corresponding normal vector direction is calculated, and the triangular mesh after the coordinate modification of the vertex is the blade with the groove type drag reduction structure. Experimental results show that the groove type drag reduction structure automatic generation method provided by the invention can arrange grooves with higher precision on the blades, and has high calculation efficiency and good robustness of the algorithm.

摘要：【中文】本发明提供一种点云的多重轮廓生成方法、装置及系统，该方法，包括：将三维点集中的点投影到切平面上，得到位于所述切平面上的投影点集；根据预设的规则，将所述投影点集划分为n个分类子集；其中n为自然数；根据所述分类子集生成所述三维点集对应的分层轮廓。本发明实现了基于点云生成更高精度的分层轮廓，降低了轮廓生成的复杂度，同时提高了3D打印的效率。 【EN】The invention provides a method, a device and a system for generating multiple outlines of point clouds, wherein the method comprises the following steps: projecting the points in the three-dimensional point set onto a tangent plane to obtain a projected point set positioned on the tangent plane; dividing the projection point set into n classification subsets according to a preset rule; wherein n is a natural number; and generating a hierarchical outline corresponding to the three-dimensional point set according to the classification subset. The invention realizes the generation of the high-precision layered contour based on the point cloud, reduces the complexity of contour generation and simultaneously improves the efficiency of 3D printing.