tesi R. Valiante.pdf - EleA@UniSA

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$3Eterov e)ce(te/rou sofo\v to/ te pa/lai to/ te nu=n. Ou ... - EleA@UniSA$

4 Fig. 3.10 - Sampling grid and snapshots of the wavefront at various instants on the skin external side............................................................................... 62 Fig. 3.11 - RMS map on the skin external side........................................... 63 Fig. 3.12 - Sampling grid and snapshots of the wavefront at various instants on the skin internal side 1 ............................................................................ 64 Fig. 3.13 - RMS map on the skin internal side ........................................... 65 Fig. 3.14- Detail of the area with reducing thickness partially responsible for the energy concentration.............................................................................. 65 Fig. 3.15 - Sampling grid and snapshots of the wavefront at various instants on the webside 1........................................................................................... 66 Fig. 3.16 - RMS map on the web side 1...................................................... 67 Fig. 3.17 - Detail of the area potentially concerned by high porosity ......... 68 Fig. 3.18 - Sampling grid and snapshots of the wavefront at different instants on the skin internal side 2 ............................................................... 69 Fig. 3.19 - RMS map on the skin internal side 2 ......................................... 70 Fig. 3.20 - Sampling grid and snapshots of the wavefront at different instants on the web side 2 ............................................................................ 71 Fig. 3.21 - Map of the mean square recorded during the time of the vibration velocities measured on web side 2 ............................................... 72 Fig. 3.22 - Wavelenght highlighted in a snapshot of the wavefront on the skin............................................................................................................... 73 Fig. 3.23 - Representation of the response measured in the domain wavenumber/frequency................................................................................ 74 Fig. 3.24 - Photograms of the whole wave field (incident waves plus reflected waves) on the external side of the skin at given time intervals. ... 77 Fig. 3.25 - Photograms of the field of reflected waves on the external side of the skin at given time intervals. ................................................................... 78 Fig. 3.26 - RMS of the field of reflected waves on the external side of the skin............................................................................................................... 79 Fig. 3.27 - Photograms of the whole wave field (incident waves plus reflected waves) on the internal side '1' of the skin at given time intervals. 80 Fig. 3.28 - Photograms of the field of reflected waves on the internal side '1' of the skin at given time intervals................................................................ 81 Fig. 3.29 - RMS of the field of reflected waves on the internal side '1' of the skin............................................................................................................... 82 Fig. 3.30 - Photograms of the whole wave field (incident waves plus reflected waves) on the internal side '2' of the skin at given time intervals. 83 Fig. 3.31 - Photograms of the field of reflected waves on the internal side '2' of the skin at given time intervals................................................................ 84
Fig. 3.32 - : RMS of the field of reflected waves on the internal side '2' of the skin......................................................................................................... 85 Fig. 3.33 - Photograms of the whole wave field (incident waves plus reflected waves) on the side '1' of the web at given time intervals.............. 86 Fig. 3.34 - Photograms of the field of reflected waves on the side '1' of the web at given time intervals .......................................................................... 87 Fig. 3.35 - RMS of the field of waves reflected on side '1' of the web........ 88 Fig. 3.36 - : Photograms of the whole wave field (incident waves plus reflected waves) on the side '2' of the web at given time intervals.............. 89 Fig. 3.37 - Photograms of the field of waves reflected on side '2' of the web at given time intervals.................................................................................. 90 Fig. 3.38 - RMS of the field of waves reflected on side '2' of the web........ 91 Fig. 3.39 - Analysis grid used on the side 1 of the web (WEB1) overlapped to the RMS map of the whole travelling wave on the same side................. 92 Fig. 3.40 - Analysis grid used on the side 2 of the web (WEB2) overlapped to the RMS map of the whole wave travelling on the same side................. 93 Fig. 3.41 - Diagrams velocity-time in correspondence to symmetrical points of sides 1 and 2 of the web, properly vertically offset................................. 94 Fig. 3.42 - Fourier transform (FFT) of the signals shown in pic. 3.40, properly vertically offset.............................................................................. 95 Fig. 3.43- Total energy versus positions graphs (WEB 1 and 2)................. 96 Fig. 3.44 - Polytec test setup........................................................................ 97 Fig. 3.45 - Impact locations. ........................................................................ 98 Fig. 3.46 - Measurements of the delaminations........................................... 99 Fig. 3.47 - Excitation signal in time representation................................... 100 Fig. 3.48 - Zoomed view of the excitation signal in time representation .. 100 Fig. 3.49 - Excitation signal in spectral representation.............................. 100 Fig. 3.50 - Response of a stiffened plate at a 270 kHz excitation applied through piezoelectric actuators on the bottom: vibrations in Z (a) directions and vibrations in Y (b) directions. The locations of real damages have been highlighted with black circle, while areas of incorrect damage indications have been highlighted with red ones.......................................................... 102 Fig. 3.51 - Photograms of the whole wave field (incident wave plus reflected wave) at given time intervals ...................................................... 105 Fig. 3.52 - Photograms of the whole wave field (incident wave plus reflected wave) at given time intervals ...................................................... 106 Fig. 3.53 - Damage index map with detailed indication of damaged zones (yellow ovals)............................................................................................. 107 Fig. 4.1 - Explicit scheme .......................................................................... 111 5
Page 1: Unione Europea Università degli St
Page 5 and 6: RINGRAZIAMENTI E’ per me doveroso
Page 7: Vorrei, infine, disporre del vocabo
Page 11 and 12: CONTENTS Abstract of dissertation .
Page 13: LIST OF FIGURES AND TABLES Fig. 1.1
Page 17 and 18: ABSTRACT OF DISSERTATION 7 ABSTRACT
Page 19 and 20: ABSTRACT OF DISSERTATION 9 are: The
Page 21 and 22: INTRODUCTION 11 Ideally, routinely
Page 23 and 24: INTRODUCTION 13 Feature extraction
Page 25 and 26: INTRODUCTION 15 1.3. GLOBAL VERSUS
Page 27 and 28: INTRODUCTION 17 damage. These inves
Page 29 and 30: INTRODUCTION 19 between shifts at v
Page 31 and 32: INTRODUCTION 21 Space Shuttle Orbit
Page 33 and 34: INTRODUCTION 23 1.6. GUIDED WAVES-B
Page 35 and 36: INTRODUCTION 25 Fig. 1.3 - Differen
Page 37 and 38: INTRODUCTION 27 Considering the arg
Page 39 and 40: INTRODUCTION 29 Fig. 1.6 - Differen
Page 41 and 42: INTRODUCTION 31 2 ω c 2 k = 2 ω
Page 43 and 44: INTRODUCTION 33 Fig. 1.8 - Frequenc
Page 45 and 46: INTRODUCTION 35 where 1 1 p1 c k =
Page 47 and 48: INTRODUCTION 37 Fig. 1.12 - Group v
Page 49 and 50: INTRODUCTION 39 Fig. 1.13 - Directi
Page 51 and 52: INTRODUCTION 41 for very simple cas
Page 53 and 54: INNOVATIVE SHM TECHNIQUES BASED ON
Page 63 and 64: EXPERIMENTAL ANALYSIS 53 3. EXPERIM
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EXPERIMENTAL ANALYSIS 55 Fig. 3.3 -
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EXPERIMENTAL ANALYSIS 57 same point
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EXPERIMENTAL ANALYSIS 63 of the ene
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EXPERIMENTAL ANALYSIS 65 Fig. 3.13
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EXPERIMENTAL ANALYSIS 69 Analysis g
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EXPERIMENTAL ANALYSIS 71 Analysis g
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EXPERIMENTAL ANALYSIS 73 and in spa
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EXPERIMENTAL ANALYSIS 75 and are tr
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EXPERIMENTAL ANALYSIS 77 obtained w
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EXPERIMENTAL ANALYSIS 81 (a) t = 68
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EXPERIMENTAL ANALYSIS 97 The data p
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EXPERIMENTAL ANALYSIS 101 To increa
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EXPERIMENTAL ANALYSIS 103 Both of t
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EXPERIMENTAL ANALYSIS 107 Complete
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FINITE ELEMENT MODELING OF WAVE PRO
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CONCLUSIONS AND FUTURE WORK 131 5.
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CONCLUSIONS AND FUTURE WORK 133 cas
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REFERENCES 135 [6] Rose, J. L. “A
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REFERENCES 137 [20] Ko, J. M., Wong
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REFERENCES 139 [35] J. D. Achenbach
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