一种用于软组织变形仿真的支撑球弹簧模型  

A SUPPORTING BALL-SPRING MODEL FOR SIMULATION OF SOFT TISSUE DEFORMATION

作　　者：史双瑶[1] 沈建新[1] 梁春[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《计算机应用与软件》2013年第1期103-106,共4页Computer Applications and Software

基　　金：中央高校基本科研业务费专项(南航NJ20120007);江苏省科技支撑计划项目(BE2010652)

摘　　要：基于经典的质点弹簧模型原理,提出一种用于软组织变形仿真的物理模型——支撑球弹簧模型。定义一系列具有质量、惯性以及体积特征的六自由度弹性支撑球,贴近软组织面模型下表面排布,支撑球之间由弹簧连接,共同构成软组织的支撑骨架来控制软组织的整体变形。软组织面模型的网格节点通过独立的弹簧与支撑骨架相连,当支撑骨架发生变形时将带动整个软组织发生变形。将此模型运用到角膜变形仿真中,获得了快速、稳定的变形效果,可进一步用于角膜虚拟手术。理论与实践均表明,该模型简单实用,效果良好。A supporting ball-spring model is proposed for the physics model of soft tissue simulation based on classic mass-spring model ra- tionale. A set of 6 DOF elastic supporting balls defined with mass, inertia and volumetric properties are arranged pressing close to the lower surface of soft tissue whose centres are connected by a set of springs, they jointly compose a supporting skeleton of soft tissue to control the whole deformation of it. The mesh nodes of soft tissue surface model connect to the supporting skeleton through a number of individual springs. When the supporting skeleton deforms, the whole soft tissue will be brought to deformation as well. We have applied this model in the simulation of cornea deformation and acquired fast and stable deformation effect, which can be used in cornea virtual surgery. The model is verified to be simple and effective in both theory and practice.

关 键 词：软组织变形 物理建模 支撑球弹簧模型 角膜变形仿真 力反馈技术 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]