【Key words】 non-stationary signal; time-frequency representation; parametric basis; adaptive signal decomposition; adaptive time-frequency distribution; Gaussian function; linear chirp; time-shear; frequency-shear; noise; instantaneous frequency;
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On the basis of Feature Modeling and 3d Solid Geometry Modeling, with the idea of Object-Oriented Product Design, a 3d Parametric Feature Modeling Method is applied to develop manifold.
采用特征对象化的设计思想,在特征造型和3维实体几何造型的基础上,研究液压集成块的3维参数化设计方法。
On the above algorithm basis, according to theory of data structures, the intersection of any parametric surfaces is found and three-dimensional graphs are given.
在此算法的基础上,利用数据结构的理论,实现了任意参数曲面的求交及拼合,并绘出了相应的三维视图。
The kind of virtual simulation provides basis for the verification of dynamic and static interference, path planning, and the parametric design of the grinder.
文中的虚拟仿真与分析也为机床结构设计中的动静态干涉、轨迹规划的合理性及参数设计的合理性评价提供了依据。
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