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Engineering Mathematica Algebra

How to solve this DAE ?

Jie Li

Posted 10 years ago

I want to use the DAE to find an analytical model. But it always run out of memory (8GB), is there anyway can solve it? DSolve[{a[t] + c[t] - f[t] == 0, d[t] + e[t] + f[t] - i[t] == 0, 2 g[t] + h[t] == 0, a[t] - e[t] == 2 d[t] + e[t] - h[t] == 0, a'[t]/3 + c'[t] == N2 a[t], d'[t]/3 + e'[t]/2 + f'[t] == D(d[t] + e[t])- e[t], g'[t]/3 + h'[t]/2 + i'[t] == M*i[t] -A}, {a[t], d[t], g[t], e[t], h[t], c[t], f[t], i[t]}, t] Where D, M, N, and A is constant. Thanks a lot!

I want to use the DAE to find an analytical model. But it always run out of memory (8GB), is there anyway can solve it?

DSolve[{a[t] + c[t] - f[t] == 0, d[t] + e[t] + f[t] - i[t] == 0, 
  2 g[t] + h[t] == 0, a[t] - e[t] == 2 d[t] + e[t] - h[t] == 0, 
  a'[t]/3 + c'[t] == N*2 a[t], 
  d'[t]/3 + e'[t]/2 + f'[t] == D*(d[t] + e[t])- e[t], 
  g'[t]/3 + h'[t]/2 + i'[t] == M*i[t] -A}, {a[t], d[t], g[t], e[t], 
  h[t], c[t], f[t], i[t]}, t]

Where D, M, N, and A is constant.

Thanks a lot!

POSTED BY: Jie Li