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10Â¥: Originally posted by peterflyer at 2014-09-23 20:49:36
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2Â¥: Originally posted by feixiaolin at 2014-09-22 21:29:12
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A1*¦Å_m(s) + A2*s^2*¦Å_m(s)=B1*s^2*¦Å_f(s) - ¦Å_f(s)
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8Â¥: Originally posted by tod2006 at 2014-09-23 10:21:32
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11Â¥: Originally posted by Àä±ùhh at 2014-09-23 21:59:43
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A1*U+A2*[s^2*U-s*¦Åm(0)-¦Å'm(0)]=B1*[s^2*V-s*¦Åf(0)-¦Å'f(0)]-V
[A1+A2*s^2]*U=A2*[s*¦Åm(0)+¦Å'm(0)]+[B1*s^2-1]*V-B1*[s*¦Åf(0)+¦Å'f(0)]
U=[A2*¦Åm(0)-B1*¦Åf(0)]*s/[A1+A2*s^2]+[A2*¦Å'm(0)-B1*¦Å'f(0)]/[A1+A2*s^2]+B1/A2*V-B1/A2*[1/B1+A1/A2]/[s^2+A1/A2]*V
=[¦Åm(0)-B1/A2*¦Åf(0)]*s/[s^2+A1/A2]+[A2*¦Å'm(0)-B1*¦Å'f(0)]/[A2*sqrt(A1/A2)]*sqrt(A1/A2)/[s^2+A1/A2]+B1/A2*V-B1/A2*[1/B1+A1/A2]/sqrt(A1/A2)*sqrt(A1/A2)/[s^2+A1/A2]*V
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¦Åm(x)=[¦Åm(0)-B1/A2*¦Åf(0)]*Cos[sqrt(A1/A2)*x]+[¦Å'm(0)-B1/A2*¦Å'f(0)]/sqrt(A1/A2)*Sin[sqrt(A1/A2)*x]+B1/A2*¦Åf(x)-B1/A2*[1/B1+A1/A2]/sqrt(A1/A2)*Integral{¦Åf(t)*Sin[sqrt(A1/A2)*(t-x)]*dt ,0,x}
14Â¥2014-09-23 23:05:58
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14Â¥: Originally posted by peterflyer at 2014-09-23 23:05:58
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A1*U+A2*=B1*-V
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U=*s/+/+B1/A2*V-B1/A2*/*V
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15Â¥: Originally posted by Àä±ùhh at 2014-09-25 15:32:50
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16Â¥2014-09-25 16:53:35
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16Â¥: Originally posted by peterflyer at 2014-09-25 16:53:35
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