3-D Numerical Simulation for Low Specific-speed Centrifugal Pump with Multi-phase Position Positive number for 'above' predicate positioning, negative number for 'below' predicate positioning. 低比转数离心泵多相位定常全三维数值模拟正数表示高于谓词位置,负数则表示低于谓词位置。
In Shanghai Jiaotong University, a numerical method has been established to predicate the steady performance of POD propulsion, which the propeller blades are calculated by a vortex lattice method and the pod including its strut by a boundary element method for non-lifting bodies. 上海交通大学曾应用升力面理论涡格法和无升力体面元法,探索了POD推进器的定常水动力性能预报理论方法。
Based on the theory of welding shrinking force, a new numerical analysis method was put forward to predicate welding deformation. 基于焊接收缩力理论,本文提出了一个预测焊接变形的数值新方法。
Adopting the concept of distance and using length of numerical value interval to different predicate truths as norm, thereby the function of distance ratio and its special transformation are defined, and from this the individual truth grad function in one-dimensional is found. 采用距离概念,并以对应谓词真值的数值区域的长度为基准,定义了距离比率函数及距离比率的特殊变换,并由此建立了一维情形下个体真值程度函数。