Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Replies: 1   Last Post: Dec 2, 1996 6:58 PM

 Messages: [ Previous | Next ]
 Mick Jones Posts: 1 Registered: 12/10/04
Posted: Dec 1, 1996 1:25 PM

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 off-centre(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)-v-t] 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 (ÃÂ£34-95) 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.

Date Subject Author
12/1/96 Mick Jones
12/2/96 James A Mccann