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Author Topic: programm for fourier synthesis  (Read 8617 times)
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tim88
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on: June 05, 2009, 04:52:37 pm » posted from:Wittenstein,Nordrhein-Westfalen,Germany

hello together,

I'm studying mechanical engineering in Germany. For a project work I'm analysing vibrations of a rack and pinion actuator. to minimize the vibrations I'm adjusting the geometry of the pinion.

the programs that I'm using gives me a Fourier analysis of the vibration. so i have the frequency spectrum. but that i can compare different adjustments i need the maximum amplitude of the vibration. and i haven't found any program that can give me the maximum amplitude just by entering the Fourier coefficients.

you would help me allot, if such a program would be possible.

greetings from germany,
Tim

PS: let me know, if you don't understand my English. i do my very best, but speaking technical in English isn't that easy for me.
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Fu-Kwun Hwang
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Reply #1 on: June 05, 2009, 06:16:55 pm » posted from:Taipei,T\'ai-pei,Taiwan

Please check out Fourier Synthesis or  EJS version of Fourier Synthesis, and let me know :Is it what you need?
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tim88
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Reply #2 on: June 08, 2009, 12:24:25 pm » posted from:Wittenstein,Nordrhein-Westfalen,Germany

the first link could be a basic for what i need.

my fourier coefficents reach from 0 to 10. In the first applet the highest possible value is 0.985. I also need the maximum aplitude in numbers. so that i can compare different results.
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Reply #3 on: June 08, 2009, 06:02:09 pm » posted from:Taipei,T\'ai-pei,Taiwan

That applet was written with JDK1.0.2. The source code is available as attachement file.
You can download it and modify it for your need!
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tim88
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Reply #4 on: June 09, 2009, 12:24:13 pm » posted from:Wittenstein,Nordrhein-Westfalen,Germany

OK, I will try but I never programmed anything before! So I first have to look for Java-code instructions...
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Fu-Kwun Hwang
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Reply #5 on: June 09, 2009, 01:01:37 pm » posted from:Taipei,T'ai-pei,Taiwan

the first link could be a basic for what i need.

my fourier coefficents reach from 0 to 10. In the first applet the highest possible value is 0.985. I also need the maximum aplitude in numbers. so that i can compare different results.

Do you just need the above two chanegs? coefficient range and maximum amplitude?
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Reply #6 on: June 09, 2009, 01:16:12 pm » posted from:Wittenstein,Nordrhein-Westfalen,Germany

yes, only those two changes. It would be great if you could do that for me.
If you have a technical problem I can propably help you sometime.
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Reply #7 on: June 09, 2009, 05:09:37 pm » posted from:Taipei,T'ai-pei,Taiwan

Did you check out EJS version of Fourier Synthesis?
It is almost the same as the first one but it has more options.

You can find out the coordinate of the wave if you click the mouse (and you can find out maximum amplitude easily).
The coefficient can be changed from -1 to 1. , but you can also change the over all amplitude (slider range from 1-20).
It means that the coefficient can be changed from -20 to 20.
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tim88
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Reply #8 on: June 09, 2009, 05:41:04 pm » posted from:Wittenstein,Nordrhein-Westfalen,Germany

yes I did. But after your explanations it is clear. yes I can use that tool, but there I have only the slidebars. It would be perfect if there where boxes to type in the values. like in the first link.
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Reply #9 on: June 09, 2009, 08:21:32 pm » posted from:Wittenstein,Nordrhein-Westfalen,Germany

hi guys,

i just solved my problems with excel. so you don't have to put any further work in this applet.

thanks.
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Reply #10 on: June 09, 2009, 09:34:43 pm » posted from:Taipei,T\'ai-pei,Taiwan

I just added the javascript to EJS version so that you can set/get those values.
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"Nothing in life is to be feared, it is only to be understood." ..."Marie Curie 1867-1934, Polish born French Physicist, Twice Nobel Prize Winner- Physics and Chemistry)"
 
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