超声行波微流体驱动模型动力学分析  

Controlling and Dynamic Analysis of Ultrasonic Traveling Wave Micro-fluid Driving Model

作　　者：姜春香[1] 魏守水[1] 白光磊[1] 邹楠[1] 

机构地区：[1]山东大学控制科学与工程学院,山东济南250061

出　　处：《应用基础与工程科学学报》2008年第1期144-151,共8页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(10572078);山东省优秀中青年科学家基金(2004BS05006)

摘　　要：超声行波微流体驱动与目前的微流体驱动技术不同,在超声行波的驱动下,借助摩擦力、声流和声辐射压驱动流体,具有无可移动部件的优点,可望在微流体散热、生化分析和药物释放领域得到应用.本文首先讨论了模型的模态选择及控制方法,然后基于有限元分析,讨论了模型固有频率与模型的结构参数之间的关系,分析了沟道尺寸对固有频率的影响.通过谐响应分析,在谐振频率处成功激励出我们所需的模态,得到幅频响应特性,最后对模型进行声固耦合分析,得出声场流体密度和声速对模型固有频率的影响及声压分布规律,为模型的进一步优化设计提供指导.Ultrasonic traveling wave micro-fluid driving is different from the present micro-fluid driving techniques in principle. Under the ultrasonic traveling wave, fluid is driven by friction, acoustic streaming and acoustic radiation pressure. It has no moveable components, then will be widely applied in the areas of micro-fluid heat dissipating ,biochemical analysis and medicament release. In this paper, the mode choice and controlling method of the model is discussed firstly. Based on the analysis of the Finite Element Method （FEM）, it discusses the relation between model＇s natural frequency and elastic body parameters, and analyzes how the channel size affects the natural frequency. By the harmonic response analysis based on the anti-piezoelectric effect, the anticipated vibration mode is successfully excited at the point of resonance frequency, and the frequency characteristic of response amplitude is obtained. Finally, according to the acoustic-structure analysis, the effect on the natural frequency of fluid density and sound velocity and acoustic pressure distribution are obtained. It provides guidance for further optimization.

关 键 词：微流体 行波 有限元 模态分析 谐响应分析 声固耦合分析 

分 类 号：TM38[电气工程—电机]