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I see the difference b/w analytic solution and analytic function. Wasn't trying to ruffle any feathers, just help out. jdm "Education is what remains after one has forgotten everything he learned in school." Albert Einstein

quote: "If one of you is aware of a possible existance of an analytical solution (even if approxinate)." From MathWorld: A real function is said to be analytic if it possesses derivatives of all orders and agrees with its Taylor series in a neighborhood of every point. By this definition if...

You can formulate your finite element equations using Galerkin expansion (some finite element formulations are based on this). A Galerkin expansion is basically just minimizing the residual wrt to a weight function. The weight function is basically a shape function, and it can be anything that...

Could you use a Galerkin expansion? Regards, jdm "Education is what remains after one has forgotten everything he learned in school." Albert Einstein

Thanks for your replies. I think on the first run I am going to try and use a plug. My only concern is the operator having difficulties taking it in and out of each part (400 pcs). I would consider a mandrel type set up, but I am not sure if this would be most cost effective. Regards, jdm...

I have a problem and am not sure what to do. I have a part and it is to be made from stainless steel round bar stock. The wall thickness that is called out is .030" and the length is 1.00". The id tolerance is +/- .001. Any ideas on how this can be machined without crushing the part? The...

I figured it out. You can use fnval in the manner which I said could not be done. ie.. m(1:n) = fnval(t(1:n),f1) + fnval(t(1:n),f2) not sure what I was doing wrong before, but this does work, and my time to compute on cycle went from 2.4sec to .35sec. Regards, jason m. "Education is what...

Hello all, I am writing a code for some data analysis, and I have to fit a spline to the local max and min points in data. To fit the spline I am using fun1 = csape(x1,y1) fun2 = csape(x2,y2) I then have to find the mean of the two splines. For that I use the following code. (I did not want...

Greg, Thanks for the info. I will experiment with the methods you outlined. I have been reading some papers on time series analysis and found a good paper outlining a method for decomposing signals into there intrinsic modal frequencies or "IMF". This shows some promise. It can be used to...

Hello all, I am working a problem, and am not sure how to proceed. Hoping someone can point me in the right direction. I have a system response that is made up of many modes of vibration. The system is nonlinear (Modal Analysis Fails!), due to the inclussion of of a series of coulomb...

I have updated from fedora 2 to fedora 3 and had no loss of data. I believe fedora and red hat are basically the same operating system. Just you get the tech support with red hat and fedora gets none. Anyways you should be fine. I believe it will ask you if you are upgrading during...

If everything is linear and you know the stress from the impact load could not back out the strain from this as a first order approximation? Regards, jm "Education is what remains after one has forgotten everything he learned in school." Albert Einstein

Does anyone know where I can find any information on the threas sizes of gas meter fittings. Specifically the 45LT, 30LT, and 10LT fittings? I have searched google and looked in the machinist hand book but have found very little. Only info so far is the pitch 11 1/2. If anyone has any...

Maple is and excellent program, I use it regulary to simplify long expressions, solve system of equations, and some calculus. I use specifically for symbolic math, not sure how well it works for numerics, for that I use MATLab. There is a program that is very similar to Maple called XMaxima...

Thank you all for your insight. I have a much better understanding. Here is how I take it: Ralieghs Quotient R is the ratio of the potential to the kinetic energy. So if the forcing does not show up in the boundary conditions it will not affect the Natural Frequency. A force in the boundary...

I have a question regarding natural frequencies of cantilever beams. Under what conditions does loading affect the natural frequencies of the beam? Does this happen when the loading shows up in the boundary condition (ie an axial load applied to the free end)? What about when the beam is...

In the MATLab command window type help for The information you want should be there. jdm "Education is what remains after one has forgotten everything he learned in school." Albert Einstein

If you are running a Linux machine, LaTeX is an excellent tool to display equations in text. "Education is what remains after one has forgotten everything he learned in school." Albert Einstein

I was always under the impression that goverment agencies were very willing to pay for continuing education. I have even heard of people working for goverment research institutions getting there PhD. at a school away from were they work while still recieving there salary. I did several...

I heard somebody today refer the "speed" of gravity. In the context of interstellar space travel. It was stated that, and I am quoting this, that "When we have computers that can conquer the speed of gravity we can travel anywhere in the universe because time stops." Anyone no what the...