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Finite Element Analysis of Ultrasonic Traveling Wave Micro-fluid Driving Annular and Cylinder Model

Author: ChenZuo
Tutor: WeiShouShui
School: Shandong University
Course: Biomedical Engineering
Keywords: Ultrasonic traveling wave Microfluidic Modal Analysis Acoustic Coupling Analysis Fluid-structure interaction analysis
CLC: R318.0
Type: Master's thesis
Year: 2009
Downloads: 79
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Abstract


With the wide application of MEMS technology in the field of biomedical engineering, drive and control technology microfluidic MEMS research has gradually become a hot topic. Ultrasonic traveling wave microfluidic drive technology in principle different from the current the various microfluidic drive technology, the traveling wave ultrasonic vibration generated by the inverse piezoelectric effect of piezoelectric ceramics aroused in the pipeline, and fluid medium in the pipeline traveling wave sound field generated under the joint action of the acoustic streaming and acoustic radiation pressure, the liquid along the direction of the traveling wave. Drive technology as a new type of microfluidic ultrasonic traveling wave drive has no moving parts, low drive voltage required, the control method is simple, conducive to miniaturization, etc., with a wide range of application prospects. This article provides an overview of the micro-electromechanical systems (MEMS) and microfluidic system development status, made a presentation on the current drive and control several microfluidic technology. Based on the inverse piezoelectric effect of the piezoelectric ceramic material characteristics and frequency characteristics, briefly traveling wave synthesis, through the study of the flow generating mechanism of the acoustic radiation pressure and acoustic, to draw the drive mechanism and the relationship of the model parameters, for ultrasound The traveling wave microfluidic drive control foundation in theory. The ultrasound traveling wave microfluidic drive the theoretical basis of finite element analysis. Based on the finite element method, finite element model of the piezoelectric ceramic is derived, coupled field analysis, modal analysis and harmonic analysis theory, the ideal medium basic equations, finite element analysis theory of sound waves and Acoustic Coupling. Using ANSYS finite element analysis software, the establishment of a circular microfluidic drive model, finite element modal analysis, model natural frequencies and mode shapes, and discuss the relationship between model natural frequency and size parameters, such as the model of the inside and outside diameters , the thickness of the elastic body, the piezoelectric ceramic thickness, etc.; by harmonic analysis, and excite the desired vibration mode, verify that the frequency characteristics, and analyzed the relationship between the displacement and the frequency of the amplitude variation in the comparison of three modal, for fluid unit analysis lay the foundation. Acoustic Coupling of ultrasound traveling wave microfluidic drive model modal analysis, comparative analysis of the coupled model with non-coupling model obtained the natural frequency of the model of the sound field; harmonic response analysis comparing B ( 0,5) mode amplitude sound pressure distribution. Ultrasonic traveling wave driven cylinder model, modal analysis, the need to get the mode shapes and natural frequencies. Filled with fluid medium in the cylinder model, Acoustic Coupling Analysis, each modal shapes, frequency and sound pressure distribution, analysis the sound pressure nephogram modal analysis of the relationship of the displacement contours; further analysis of the different fluid media The natural frequency of air and water. Select the air cylinder model as a fluid medium for fluid-structure interaction analysis, outlining the principles of fluid-structure interaction, fluid-structure interaction model establishment and analysis steps; obtained by analyzing the flow chart of the speed of the fluid in the cylinder inside speed cloud images, can understand the fluid movement inside the cylinder model, further analysis of the microfluidic sports and mixed to provide a reference, and further optimize the design of the model structure.

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues
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