Structural Optimization of Damping Groove Based on Valve Plate Dynamic Cavitation Response Model

To reduce cavitation occurring on valve plate of piston pump,an optimization design method was introduced to quantitively analyze the accurate relationship between structural jet groove parameters and cavitation. Using the computational fluid dynamics（ CFD） method,the absorbing and discharging processes in piston pump were simulated dynamically. The damping groove＇s structure effects on both jet angle and pressure shock were analyzed visually with a series of different parametrical grooves. By establishing parametrical damping groove model,the piston pumps＇ dynamic analysis was integrated with CFD analysis,experimental design and approximation model, etc. The mathematical model of plunger pressure during oil back period,jet angle and structural parameters of damping groove were established in the form of second-order response surface method（ RSM） model. The damping groove structure of valve plate was optimized on the basis of the RSM model. Test data shows that the anti-cavitation performance of optimized valve plate was obviously improved. And this method provides theoretical foundation for the structure design of damping groove.     

关于板弯曲问题友解的研究

为了把无网格局部边界积分方程方法应用于求解板弯曲问题中 ,给出了板弯曲问题无网格局部边界积分方程方法所需要的友解及其全部公式 .     

利用DICOM图片优化脑部三维成像

医学影像三维重建具有重大的临床诊断价值，但由于原有医学影像文件格式的缺陷，致使基于该影像文件的三维重建结果存在着信息不全、噪声偏多的缺陷，直到医学DICOM影像文件格式的出现，这一状况得到极大改观．首先阐述了医学DICOM图片格式，随后着重探讨了在用OpenGL进行脑部三维重建中如何充分利用DICOM的优点，从而使得三维重建既快速又准确．①