Recent content by jasonbot

I have a signal that I am able to calculate through an acoustic model for airfoil noise. I am told that the model solves for a narrowband frequency response, however, my measurement data is provided in third-octave band representation. How do I convert my current dataset to the third octave...

Thank you so much! It seems to be working! I guess the error shouldve been self explanatory but since I have no working knowledge of fortran I didnt know the syntax that I needed to get the programme working. Just to add, however, I was using gfortran not gcc. I don't know if that made a...

I have attached the file that is giving me problems. The file is compiled with a makefile

Hi, I'm having trouble with some FORTRAN code I'm trying to use. I receive an error: At line 769 of file ../src/mpolar.f (unit = 11, file = 'polarx.387') Fortran runtime error: Sequential READ or WRITE not allowed after EOF marker, possibly use REWIND or BACKSPACE Upon inspection...

Thank you Solkar. What do you mean by using non standard names? I'm new to fortran and wouldn't say I'm keen to learn it. I just need to use the programme for some work. After using your suggestion it seemed to have compiled correctly although now I have some problems with additional...

Hello, I'm trying to compile some software called MSES, its written by Mark Drela in some fortran flavour. I've successfully compiled a number of subroutines through make files but there is one subroutine giving me grief. It's called dplot.f. It has a strage syntax I can't seem to work...

I was thinking of joining the RAF as an Engineering Officer not a pilot so that I could use my undergraduate engineering degree? The reason I looked at the UK is because of my EU citizenship which I'd have thought would make it more accessible than say Canada or Australia.

I'm about to start my final year of Undergraduate Mechanical Engineering here is South Africa but as far as my options are for jobs in the Aeronautical field (which I'm interested in) they are limited to manufacturing and maintenance. Because of this I'm thinking of joining the RAF after my...

That makes sense actually. So assuming that I go delta_st=F0/k=(150+12)*9.81/3000=0.52974 X1=delta_st*-5,836x10^-4=-0.000309 so then I'm assuming the changed displacement amplitude will be the difference between measured and X1 from calculations. so X1'=-0.000309+0.0002=-0.000109mOh and...

Homework Statement An air compressor of mass m1 = 150 kg is mounted on a spring of stiffness k1= 3000 N/m. The measured displacement amplitude X1 = 0.0002 m at the operating speed of N = 1800 r/min. If an undamped isolation system with mass m2=12 kg and a natural frequency w2 = 105 rad/s...

Thanks. Its just that I had exactly the same question as the OP which I thought was interesting. Anywyas I figured it was just a different method of calculation.

I know this is really old but I have exactly the same issue! I'll be asking my lecturer within the week though. I think it has to do with the thickness value used though... lol

I did note that, it's just easier this way. Thanks CompuChip

Gah! My bad :( I feel quite stupid now... The exercise is on integrating factors and I didn't see that O_o Thanks vela for clearing up integrating factors for me :D so to continue... ∫1/(1-y)dy=∫cosxdx -ln(1-y)=sinx+c 1-y=Ae^(-sinx), A=e^c -y=Ae^(-sinx)-1 y=-Ae^(-sinx)+1 which according to...

Homework Statement Hi, I'm struggling with a differential equations: y'=(1-y)cosx Homework Equations The Attempt at a Solution y'=cosx-ycosx p(x)=e^(∫-cosxdx) =e^-sinx y'e^-sinx=e^(-sinx)cosx-e^(-sinx)ycosx then I get confused because of the derivative. I...