Performance Evaluation of Piezoelectric Synthetic Jet Actuators Using Design Parameters Approach
楊育彰、羅正忠
E-mail: 9314532@mail.dyu.edu.tw
ABSTRACT
The primary objective of active flow control research is to develop a cost-effective technology that has the potential for revolutionary advances in aerodynamic performance and maneuvering compared to conventional approaches. The development of such systems have many implications for aerospace vehicles including: reduced mechanical complexity and hydraulic failure, reduced noise and weight, lower energy and fuel consumption, lower downtime and maintenance, enhanced maneuvering and agility with enhanced aerodynamic performance and safety. Interest in active flow control for aerospace applications has stimulated the recent
development of innovative actuator designs that create localized disturbances in a flow field. The primary objective of this thesis is to set up a finite element model of piezoelectric synthetic jet actuators and two experiment devices to research the optimization of designing parameters of influences in flow speed. The designing parameters are the area of piezoelectric synthetic jet, flow field volume, cavity depth and slot size. Characteristics of system (frequency, amplitude and flowing speed) will be measured
experimentally when the designing parameters are changed. By system model, the designing parameters will be optimized and the performance of piezoelectric synthetic jet will be evaluated. Natural frequencies and parameters of equivalent circuit of piezoelectric actuator will be measured by impedance analyzer, to provide a useful tool to make studies of the relation of dimensions and flowing speed of piezoelectric synthetic jet.
Keywords : piezoelectric actuators, synthetic jet actuators, impedance model Table of Contents
簽名頁 授權書...iii 中文摘要...v 英文摘
要...vi 誌謝...vii 目錄...viii 圖目錄...x 表目錄...xiii 符號說
明...xiv 第一章 問題描述 1.1壓電性質...1 1.2壓電致動 器...3 1.3研究背景...3 1.4國內外有關本問題之研 究...7 1.4.1在應用於提昇空氣動力效率方面...7 1.4.2在主動式氣流控制的應
用...8 1.4.3在有關壓電噴射氣流器特性研究方面...9 1.4.4壓電噴射氣流器的最佳化設計方面...10 1.4.5在應用於MEMS方面...11 1.4.6在阻抗模型方面...12 1.5設計因
素...12 1.6本文目的...13 第二章 設計與有限元素分 析 2.1實驗模具設計...15 2.2阻抗模型...26 2.2.1阻抗分析 儀...34 2.3有限元素法分析...36 2.3.1圓形薄
板...36 2.3.2壓電片...41 2.3.3致動圓
板...43 第三章 實驗方法與實驗量測 3.1實驗架構...45 3.2 模型(1)和模型(2)的比較...48 3.2.1三種實驗條件下的頻率響應...48 3.2.2四種實驗條件下 的RMS...54 3.2.3三種實驗條件下的流速比較...57 3.2.4氣室深度的比
較...61 第四章 結論與未來工作 4.1目前研究結果...66 4.2未來工 作...68 參考文獻...69
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