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System of differential equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128970] System of differential equations
  • From: hazem.abdelhafiz at gmail.com
  • Date: Thu, 6 Dec 2012 04:58:13 -0500 (EST)
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  • Delivered-to: l-mathgroup@wolfram.com
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Dear all,
I want to solve this system of equations but I always get an error

NDSolve::ndnum:Encountered non-numerical value for a derivative at t==0

can any one help me on this 

s=NDSolve[{
ph1''[t]+ph1'[t]+sin[ph1[t]]-mu[t]-mu'[t]==0.005,
ph2''[t]+ph2'[t]+sin[ph2[t]]+mu[t]+mu'[t]==0.005,
0.2mu'[t]+mu[t]==ph1'[t]-ph2'[t],
ph2[0]==0,
ph1[0]==0,
ph2'[0]==0,
ph1'[0]==0,
mu[0]==0
},
{ph1[t],ph2[t],mu[t]},
{t,0,5000}
]

thanks in advance,



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