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# Problem to resolve ODE of a Circular Membrane of Science of Construction

Posted 9 years ago
 Hi I'm Giovanni and I 'm a new user.I want to ask you why when i try to resolve my ODE of circular membrane in circular coordinate placed in a centre of circular membrane: DSolve[{w''[r] + (1/r) w'[r] + p == 0, w[R] == 0, w' == 0}, w[r], r]  r=indipendent variable ,w = spostament membrane ,p=uniform pression R= radius of circular membrane and I impone my boundary condition , in Mathematica 10 as out ,appears to me an error : "DSolve::deqn: Equation or list of equations expected instead of True in the first argument {p+w'[r]/r+w''[r]==0,w[R]==0,True}. " What I'm wrong??? I try the error but i don't understand the error...I hope I was clear. In the image is the first line. Attachments:
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Posted 9 years ago
 Thanks Marco!!! I solved the error with your command.Thanks again.
Posted 9 years ago
 Hi,I might be misunderstanding your problem, but if you use w[r] instead of w, it appears that you get the expected result.  v = DSolve[{\!$$\*SubscriptBox[\(\[PartialD]$$, $$r, r$$]$$w[r]$$\) + 1/r \!$$\*SubscriptBox[\(\[PartialD]$$, $$r$$]$$w[r]$$\) + p == 0, w[R] == 0, w' == 0}, w[r], r] You get and no error message. You might want to execute ClearAll["Global*"] `first.Cheers,Marco