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Structural Health Monitoring Damage Detection Systems for Aerospace

為了解決Defect detection的問題，作者 這樣論述：

This open access book presents established methods of structural health monitoring (SHM) and discusses their technological merit in the current aerospace environment. While the aerospace industry aims for weight reduction to improve fuel efficiency, reduce environmental impact, and to decrease ma

intenance time and operating costs, aircraft structures are often designed and built heavier than required in order to accommodate unpredictable failure. A way to overcome this approach is the use of SHM systems to detect the presence of defects. This book covers all major contemporary aerospace-rel

evant SHM methods, from the basics of each method to the various defect types that SHM is required to detect to discussion of signal processing developments alongside considerations of aerospace safety requirements. It will be of interest to professionals in industry and academic researchers alike,

as well as engineering students. This article/publication is based upon work from COST Action CA18203 (ODIN - http: //odin-cost.com/), supported by COST (European Cooperation in Science and Technology). COST (European Cooperation in Science and Technology) is a funding agency for research and innova

tion networks. Our Actions help connect research initiatives across Europe and enable scientists to grow their ideas by sharing them with their peers. This boosts their research, career and innovation.

Key Technologies of Intelligentized Welding Manufacturing: Visual Sensing of Weld Pool Dynamic Characters and Defect Prediction

為了解決Defect detection的問題，作者Chen, Zongyao,Feng, Zhili,Chen, Jian 這樣論述：

Introduction.- Monitoring of Weld Pool Surface with Active Vision.- Visual Sensing of 3D Weld Pool Geometry with Passive Vision.- Penetration prediction with data driven models.- Penetration Control for Bead-on plate weld.- Penetration Detection and Control Inside U-groove.- Lack of fusion detect

ion inside narrow U-groove.- Measuring Material Deformation using Digital Image Correlation.- Conclusions.

基於曲電與介電效應之三穩態切換負型膽固醇液晶元件的光電響應

為了解決Defect detection的問題，作者陳冠然 這樣論述：

本研究於負型液晶DV10001中添加右旋手性分子R5011形成負型膽固醇液晶，接著經由摻雜不同配比濃度之彎曲型液晶分子CB7CB使配製完成之液晶材料具有不同程度的曲電特性，筆者藉此探討負型膽固醇液晶在摻雜彎曲型液晶分子後於不同電場條件下的紋理形成種類以及其光電響應。實驗結果分析中，對於形成紋理之介電頻譜進行首要之探討，透過均勻橫向螺紋態（ULH）紋理於介電實部之曲電鬆弛訊號判斷此材料之曲電特性，接著將其鬆弛強度90%與10%所對應於介電頻譜上之頻率點進行紋理切換頻率區間的劃分，並作為此研究之三穩態紋理切換中操作頻率區間的依據。當操作頻率f < fL，液晶分子因強烈的電流體效應及曲電強度而得以

形成ULH態；在頻率fL < f < fH區間中，曲電特性隨著頻率的增加逐漸變小，漸漸的由介電效應主導，此時液晶分子於電場驅動下形成焦錐態（FC）；當頻率f > fH，此時曲電效應幾乎完全消失，液晶分子受介電效應主導而形成平面態（P）。筆者藉由本研究提供了讀者一套於負型膽固醇液晶達成三穩態紋理切換的分析方法，並透過介電頻譜與光電特性量測詳細地說明其紋理背後的形成機制與應用。