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mathematica 2.23, help please
Posted:
Dec 1, 1996 1:25 PM


can anybody out there please help me, i have a friend who's lecturer refuses to help her solve a mathematica problem and she is unable to find any written references to it. the problems are as follows:
PROBLEM VISUALISATION OF NORMAL MODE OSCILLATIONS OF A CIORCULAR DRUM MACHINE
Consider a set of solutions associated with a particular set Wi of the form J2(Wir/c)cos(2X)cos(tWi) which is a set of modes that might have been set up by striking the drum membrance offcentre(rnot equal to 0).If the membrance is held at z=0 around its circular perimeter r=a then J2(aWij/c)=0 and there are many different Wi's which satisfy the solution. Using MATHEMATICA examine the solutions for the two lowest values of Wi these correspond to the first two zeros of the Bessel function J2() and using Cylindrical Plot 3D calling the package Graphics'Parametric Plot 3D' plot[z(r,x)vt] for one complete period of each of the two frequencies W1 and W2 at intervals of 1/8 period.
I have to solve this problem by Friday the 6th of December.
I have already solved three similar problems but I can't seem to even understand what this problem involves.I have bought Stephen Wolfram's third edition book (ÃÂ£3495) which helped me up until now but it doesn't help me much in this particular problem.If there is somebody out there that knows what this problem is all about please do help me! And I don't mean solve the problem for me,just give me a start or an advice on how to start solving it. If you are not able or willing to help me thanks for reading my message anyway...
Ron Owen Technical Director Neatstep Consultancy Ltd.



