FDTD法模拟二维弹性模型中冲击波的传递  

Simulating the Propagation of Shock Wave Through Two-dimensional Elastic Model by a Finite Difference Time Domain Method

作　　者：金若鹏[1] 傅增祥[1] 浮德海 卜毅男[1] 姚远[1] 

机构地区：[1]西北工业大学生命科学院,西安710072 [2]北方光电科技集团有限公司,西安710065

出　　处：《机械科学与技术》2011年第3期463-465,470,共4页Mechanical Science and Technology for Aerospace Engineering

摘　　要：基于液电冲击波效应的碎石机在治疗尿路结石和矿业碎石等方面都已经很好地应用。目前的碎石机,不能根据石头特征产生最佳的冲击波特征和次数,医疗中容易对机体组织产生损伤,矿业中容易导致效率低。发展一种能够实时检测目标石头特征,并产生对应最佳冲击波和冲击次数的智能型碎石机是本项目研究的最终目的。为此,需要建立冲击波在目标中的传递和致裂模型。笔者采用时域有限差分法(finite difference time domain,FDTD),数值模拟了冲击波在二维线弹性模型中的传播过程。结果表明:在目标远端的内部,由于冲击波的再次聚焦,产生最大的拉应力和剪应力,这是导致结石最初碎裂的主要原因和位置。Extracorporeal shock wave lithotripter is the main nondestructive means of curing urinary calculi. The current lithotripter and method of curing can not produce the optimum characteristics and the number of the shock waves according to the characteristics of stones. The overall shock pressure and shock number generally result in tissue injury. To develop an intelligent lithotripter which can generate optimum shocks based on real-time detection and judgment of the stone characteristics is necessary. Thus the modeling and prediction of the shock propagation and fragment in the stone are the fundamental works with a finite difference time domain （FDTD） method, this article simulate the propagation within a acrylonitrile butadiene styrene（ABS） model. The results show that the maxi- mum stress occurs at the wave outgoing area of the target because of the refocusing, which is the main reason for the initial fragmentation.

关 键 词：体外冲击波碎石机 线弹性 时域有限差分法 

分 类 号：TD921.2[矿业工程—选矿]