tesi R. Valiante.pdf - EleA@UniSA

More documents

Recommendations

Info

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

The The present present work, work, carried carried out out at at Alenia Alenia Aeronautica, Aeronautica, contains contains sensitive sensitive information information and and data data covered covered bby b y the Intellect Intellectually Intellect ually Property Property Rights. Rights. Therefore, Therefore, the the use use use of of such such information information and and data data is is allowed allowed only only under under under permission permission permission of of of Alenia Alenia Alenia Aeronautica. Aeronautica. Aeronautica.
Page 1: Unione Europea Università degli St
Page 6 and 7: Dico grazie infinite a Pierpaolo D
Page 9: A PAPÀ, MAMMA E PINA, RISPETTIVAME
Page 12 and 13: 2 3.5. First Conclusions ..........
Page 14 and 15: 4 Fig. 3.10 - Sampling grid and sna
Page 16 and 17: 6 Fig. 4.2 - Explicit scheme diagra
Page 18 and 19: 8 The aim is to obtain a comprehens
Page 20 and 21: 10 1. INTRODUCTION All civil, mecha
Page 22 and 23: 12 1.1. GENERAL SHM PARADIGM Damage
Page 24 and 25: 14 damage mechanisms in composite p
Page 26 and 27: 16 diagnostics have associated adva
Page 28 and 29: 18 however, complicated by the mult
Page 30 and 31: 20 ∆ i 2 where { ( ) } n φi ω =
Page 32 and 33: 22 the damaged region and that dama
Page 34 and 35: 24 Most structural elements of aero
Page 36 and 37: 26 This equation is known as the wa
Page 38 and 39: 28 Another solution to the wave equ
Page 40 and 41: 30 ⎛ ⎜ ⎜− k ⎝ 2 − K F 2
Page 42 and 43: 32 2 2 On the other hand, if ω c <
Page 44 and 45: 34 the Re ( k) > 0 and Im ( ) > 0 k
Page 46 and 47: 36 This velocity is called group ve
Page 48 and 49: 38 cL for the longitudinal mode and
Page 50 and 51: 40 ν = 2 λ ( λ + µ ) (1.40b) To
Page 52 and 53:
42 wavenumbers. In a plate, in addi
Page 54 and 55:
44 Furthermore, full wavefield meas
Page 56 and 57:
46 EI EI * p p U ≈ U x p + 1 * 2
Page 58 and 59:
48 2.3. STRAIN ENERGY DISTRIBUTUION
Page 60 and 61:
50 i ( −) r ( −) t ( + ) u& ( x
Page 62 and 63:
52 structural damages and discontin
Page 64 and 65:
54 Fig. 3.1 - Laser Vibrometer used
Page 66 and 67:
56 3.1. DESCRIPTION OF THE MEASURE
Page 68 and 69:
58 − The frequency intervals with
Page 70 and 71:
60 Fig. 3.7 - Signal recorded corre
Page 72 and 73:
62 3.3.1. SKIN EXTERNAL SIDE The vi
Page 74 and 75:
64 Analysis grid, 2009 points t=0.0
Page 76 and 77:
66 3.3.3. WEB SIDE ‘1’ The vibr
Page 78 and 79:
68 Fig. 3.17 - Detail of the area p
Page 80 and 81:
70 RMS Fig. 3.19 - RMS map on the s
Page 82 and 83:
72 Fig. 3.21 - Map of the mean squa
Page 84 and 85:
74 Fig. 3.23 - Representation of th
Page 86 and 87:
76 acoustic (travelling) waves over
Page 88 and 89:
78 (a) t = 166ms (c) t=215ms (b) t
Page 90 and 91:
80 (a) t = 68ms (c) t = 117ms (b) t
Page 92 and 93:
82 Fig. 3.29 - RMS of the field of
Page 94 and 95:
84 (a) t = 68 ms (b) t= 93ms (c) t
Page 96 and 97:
86 (a) t = 44ms (c) t = 117ms (b) t
Page 98 and 99:
88 Fig. 3.35 - RMS of the field of
Page 100 and 101:
90 (a) t = 142 ms (b) t= 166 ms (c)
Page 102 and 103:
92 and points 19, 89 and 614 on the
Page 104 and 105:
94 than to what is observed on side
Page 106 and 107:
96 extremity of the abscise axe) an
Page 108 and 109:
98 runs automatically over a larger
Page 110 and 111:
100 Fig. 3.47 - Excitation signal i
Page 112 and 113:
102 (a) (b) Fig. 3.50 - Response of
Page 114 and 115:
104 - it show exactly the reflectio
Page 116 and 117:
106 t = 107ms t = 117ms Fig. 3.52 -
Page 118 and 119:
108 1. The Lamb waves (or guided wa
Page 120 and 121:
110 very fine grid coming from the
Page 122 and 123:
112 The Leap-frog scheme results in
Page 124 and 125:
114 4.2. GEOMETRY OF MODEL The firs
Page 126 and 127:
116 Fig. 4.7 - Panel geometry (late
Page 128 and 129:
118 Fig. 4.8 - Cut-off of the total
Page 130 and 131:
120 4.4. LOADS AND CONSTRAINTS For
Page 132 and 133:
122 Fig. 4.12 - Loads and constrain
Page 134 and 135:
124 Composite properties, whose det
Page 136 and 137:
126 4.7. MODELING OF THE EXAMINED P
Page 138 and 139:
128 shape, but in frequency too is
Page 140 and 141:
130 t= 0.04.2578 ms t=0.071094ms t=
Page 142 and 143:
132 technique, as historical data m
Page 144 and 145:
134 i.e. loading the model with the
Page 146 and 147:
136 [13] Stubbs, N., Osegueda, R.,
Page 148 and 149:
138 [27] Cornwell, P., Doebling, S.
show all

tesi R. Valiante.pdf - EleA@UniSA

Create successful ePaper yourself

Delete template?

Save as template?