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L25x - 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74...

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The Wave Equation The Guitar In the case of the guitar or the harpsi- chord, a string is pulled by a finger or hook to initial shape u (0 , x ) = f ( x ) and then released with zero initial velocity [ g = 0 ]. Then the solution is u ( t, x ) = X n =1 a n sin nπx L cos nπαt L , where a n def = 2 L Z L 0 f ( x ) sin nπx L dx , n = 1 , 2 . . .
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so that f ( x ) = X n =1 a n sin nπx L . Observe f ( x + at ) = X n =1 a n × sin nπx L cos nπαt L + sin nπαt L cos nπx L f ( x - at ) = X n =1 a n × sin nπx L cos nπαt L - sin nπαt L cos nπx L and u ( t, x ) = ˇ f ( x + αt ) + ˇ f ( x - αt ) 2 , 2
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where ˇ f is the 2 L –periodic extension of the odd extension of f to [ - L, L ] . 3
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Unformatted text preview: 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183...
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