基于高精度DHPTV的磁流变微观结构与机理的三维可视化研究

项目名称： 基于高精度DHPTV的磁流变微观结构与机理的三维可视化研究

项目编号： No.11272368

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 杨岩

作者单位： 重庆理工大学

项目金额： 86万元

中文摘要： 研究磁流变液(MRF)的流变机理就要准确解读其微观形态与演化过程。目前对MRF的微观观测基本属于静态研究(2D或3D),不能判断粒子成链运动过程及响应速度，对多链结构向柱状或块状结构的转化过程也不能准确观测。 数字全息粒子跟踪测速(DHPTV）技术可以实时采集粒子场三维信息，但CCD像素尺寸限制了其测量精度，目前实用性不强。 本研究将非线性晶体引入到DHPTV中，利用其光学折变和能量增强作用提高测量精度。研究相应的重建公式、晶体选型原则、粒子焦平面定位方法，辅以相应的图像处理技术，得到一种高精度DHPTV技术。 将该技术用于MRF微观结构和流变特性的可视化测量研究，确定优化实验方案与参数，得到精确结果，利用该结果对推导的力学预测模型进行对比修正。 最终建立基于高精度DHPTV的磁流变微观结构及作用机理的三维可视化测量技术体系，并得到能精确描述MRF流变特性的力学预测模型。

中文关键词： 磁流变液；数字全息粒子跟踪测速；非线性晶体；高精度；三维可视化

英文摘要： The rheological mechanism of MR fluids is based on its microstructure and transformation. In present, all research on microstructure of MRF are in static state(2D or 3D). They can not show the train process, the responding velocity, and the transform process from muti-chain to pillar and wad. Digital holographic particle tracking velocimetry is a technique which can capture 3D informations of particle fields. But its resolution is lower because of the pixel size of CCD. This study introduce the linear crystal into the DHPTV. The measurment precision is improved by the optical effect and the power enhancing. Base on the reconstruction equation, the selection principle of crytal, the method of focal plane determiantion, and the image processing methods, a high precision DHPTV technique is abtained. The DHPTV is use in visualization of MRF microstructure and rheological mechanism. The optimal experimental scheme and parameters are obtained and the high precision measurement result is yielded.The measurment result is compare to the numerical result, and both of them are corrected. At last, the technical system of measurment for microstructure and rheological mechanism of MRF base on high precision DHPTV is obtained. The exact numerical result which presents the heological mechanism MRF is achieved.

英文关键词： MR Fluids；DHPTV；Linear crystal；high resolution；3D visualization