Recent content by hurcw

Thanks again for responding. The results of this analysis will not be used for anything, the idea of this exercise is to work through the original damage report and do some of my own analysis and see if anything can be added or any conclusions can be made. How would you start.?

Hi SteamKing, Thanks for the response much appreciated. The structure is fabricated from 275 grade steel and is a combination of welded box section style members and bolted 'I' beam connections. I know all the live loads and dead loads but would need to calculate the self-weight of the...

Hi all, I am having trouble with a work/course related issue. As part of a project assignment I have decided to research the failure of some of the roof structure members at my place of work. To do this I need to calculate the reactions forces in the roof supports, but some trusses have two...

Not really getting what you mean, i will have to look after work and see how i get on just to get me started i think. I appreciate the help

What i need to prove is that a) f(t) = e2t 0<t<1 = (e2-1)/2+Ʃ((4/(4+n2∏2))(e2COS(n∏)COSn∏t) b)f(t) = e2t 0<t<∏ = Ʃ(2n∏/(4+n2∏2))(1-e2COS(n∏))SIN n∏t If this make sense.

Thanks for the reply, what i ahve is two different questions, but one is a cosine series and the other a sine series, or at least that's how i understand it. I have the answers but i have to prove my method and i just keep getting lost. I sounds like i have messed up fro the beginning by...

Half wave Fourier series help ! I am trying desperately to figure out a Fourier series question i have been given and have hit a big mental wall can someone please help and maybe point me in the right direction. The problems i have been given are:- a) f(t)=e[^2t] 0<t<1 (cosine series)...

I need to then try and find the inverse Laplace transform of X & Y can anyone assist me in telling me if i am close with:- X=2e^(-3t)*cosh3t Y=e^(-18t)-2e^(-3t)*cosh3t This forum has been more than helpful so far and is highy recommended

I get the 2s & the 18-2s. Am i correct in thinking these sre complex roots and by definition are quite complex to solve especially the 18-2s one.? any help is appreciated

Can anyone offer any more assistance with his please, all the help so far has been greatly appreciated.

Thats great, thanks alot. Just out of interest where has the 2s in X come from and the 18 - 2s in Y come from, i can work out the bottom lines. sorry if i appear stupid but it is 5.20am. From there i can use partial fractions to determine the inverse Laplace transform (I think anyway).

Can you ellaborate a little please. Where did this all come from?

The '2' is from the original 2q. I don't get what you mean about my differentiation at the end, i have not differentiated yet. Where am i going wrong ? So is it this line that is wrong? q=(5(2e(2t)sin(t)+e(2t)cos(t))+C/2e(2t) Should it be q=5(2e(2t)sin(t)+e(2t)cos(t))+C/e(2t) which would...

I have to try and solve the following simultaneous Laplace transform problem and don't really know which path to take can someone give me a nudge in the right direction please. dx/dt=4x-2y & dy/dt=5x+2y given that x(0)=2, y(0)=-2 this is what i have so far for dx/dt=4x-2y sx-x(0)=4x-2y...

I have tried to use this example as a guide and just get lost in it all. am i right in thinking this?:- ∫udv=uv-∫vdu u=5sin(t) dv= e(2t) so:- du=-5cos(t) v=e(-2t) Therefore ∫udv=uv-∫vdu =5e(-2t)sin(t)-∫e(-2t)-5cos(t) Then i get stuck plus the 2 on the LHS is...