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How-do-i-c​onvert-tim​e-domain-d​ata-into-f​requency-d​omain of an mems accelerometer ?

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Anshul Sharma
Anshul Sharma on 25 Mar 2018
Edited: Walter Roberson on 26 Mar 2018
I have to get modal parameters as output. #excluding fft, stft, packet wavelet transfom

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Anshul Sharma
Anshul Sharma on 26 Mar 2018
The sensors used were dual channel microelectromechanical systems (MEMS) accelerometers having natural frequency of 150 Hz and sensitivity of 1 V/g. Accelerometers provide voltage output, which is proportional to the acceleration of the points of placement.
Modal parameters will be- frequencies,mode shapes,modal energy,damping ratios. of the structure.
Walter Roberson
Walter Roberson on 26 Mar 2018
How many of these two axis devices are being used on the same structure? If multiple are being used are they all aligned on the same plane or are some of them rotated to give three dimensional data?
To confirm, there are multiple such sensors on the structure and you wish to analyze the movement characteristics of the structure? Movement in a plane? Movement in 3d? Movement for each point in the structure since different points could be reacting differently?
What else is known? It is not easy to talk about measuring reactions if you do not know what you are reacting to.
Like is this a test rig setup where you have a number of different runs where you start with the object at rest in a known position and you know the characteristics of the signal to be applied for a time and you know where it is being applied, and you take measurements over these conditions and later try to derive the parameters you mention? Or is this a situation like handling a kid an odd shaped object and the kud is told to go play with it, and the task is to figure out all about how the various parts are connected together and their elasticity and spring constants and so on just by looking at the measurements but without information about exactly what the kud was doing at the time?
Anshul Sharma
Anshul Sharma on 26 Mar 2018
@Walter_Roberson
Sir, In order to answer your queries I am attaching url of a rasearch article from which I hope many of them will be clarified.This is the same problem I wish to work on. https://link.springer.com/article/10.1186/2008-6695-5-25

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Answers (1)

Abhishek Ballaney
Abhishek Ballaney on 26 Mar 2018
https://in.mathworks.com/help/matlab/ref/fft.html

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Anshul Sharma
Anshul Sharma on 26 Mar 2018
@Abhishek_Ballaney Sir,Thanks for reply. Can u suggest some other approach excluding the above mentioned,that would be much helpful.

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