1,339 research outputs found

    FORMATION OF SECONDARY VORTEX DURING VORTEX-WEDGE INTERACTION

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    This work was supported in part by Korea Science and Engineering Foundation 891-0916-01 1-2

    YMGYSYLLTU Â GOROESWYR TRAIS YN ERBYN MENYWOD, CAM-DRIN DOMESTIG, A THRAIS RHYWIOL (VAWDASV) CYMRU:Adroddiad Terfynol

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    Nod yr ymchwil hon oedd deall arferion o ran ymgysylltu â goroeswyr ar hyn o bryd o fewn sector Trais yn erbyn Menywod, Cam-drin Domestig a Thrais Rhywiol (VAWDASV) Cymru, achlywed ganddyn nhw.Gweithiodd Prifysgol De Cymru (PDC) gyda thîm VAWDASV Llywodraeth Cymru (LlC) mewn partneriaeth a sefydlwyd trwy Rwydwaith Ymchwil VAWDASV Cymru. Arweiniwyd tîm yr astudiaeth gan Dr Sarah Wallace (Prifysgol De Cymru) gyda'r Athro Emily Underwood-Lee (PDC), Amy Jones (LlC), a Rebecca Griffiths (LlC). Mae Rhwydwaith Ymchwil VAWDASV Cymru wedi ymrwymo i archwilio'r ffordd orau y gallwn ymgysylltu â goroeswyr yn ein gwaith, a chlywed ganddyn nhw. Mae LlC hefyd wedi amlinellu eu hymrwymiad i greu Glasbrint Ymgysylltu â Goroeswyr yn Strategaeth Genedlaethol VAWDASV LlC (2022-26). 2 Oherwydd ein diddordeb cyffredin mewn deall arferion ymgysylltu â goroeswyr, daeth tîm VAWDASV LlC a Rhwydwaith Ymchwil VAWDASV Cymru at ei gilydd i gynnal arolwg gyda'r darparwyr gwasanaethau a gweithwyr proffesiynol sector VAWDASV. <br/

    High-Resolution Wavenumber Bandpass Filtering of Guided Ultrasonic Wavefield for the Visualization of Subtle Structural Flaws

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    Guided ultrasonic wavefield propagation imaging (GUPI) is useful for visualizing hidden flaws in aerospace thin-walled structures, but the need for subjective signal processing involving three-dimensional Fourier transformation to increase the visibility of subtle flaws hinders its wider acceptance. A high-resolution wavenumber bandpass filter capable of consolidating subtle flaw-relevant information from a wide frequency band using only two-dimensional Fourier transformation was proposed. The filter overturns the long-standing belief that modes must be separated based on narrow-band data acquisition or processing to achieve high flaw visibility. Its characteristics and advantages were experimentally demonstrated through enhanced visualization of hidden wall-thinning flaws of a plate specimen. Its strength was further demonstrated through the first GUPI visualization of a partially loosened bolt, with unprecedented clarity to discern bolt tightness levels. The results conclusively proved that the proposed filter significantly enhances the resolution of GUPI within a structured processing framework
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