【Key words】 mathematic programming； mode searching method； uniformity design method； oil well orbit； oil well orbit curve； unitary design model； azimuth angle compare method.；
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Therefore a new design method with varying spiral angles of volute was proposed by means of focus on improving the uniformity of pressure field near the tongue of the volute.
因此，提出了一种通过改善蜗舌附近压力区的均匀性的、新的变螺旋角蜗壳设计方法。
The preform design applying the method for preform optimization based on FEM can improve the deformation uniformity within forgings effectively.
应用基于正向有限元数值模拟和最优化方法进行坯料预成形设计的新方法，可显著提高锻件各部位的变形均匀性。
The preform design applying the method for preform optimization based on FEM can improve the deformation uniformity within forgings effectively. The fundamental of this method is formulated firstly.
应用基于正向有限元数值模拟和最优化方法进行坯料预成形设计的新方法，可显著提高锻件各部位的变形均匀性。
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