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# how to generate random accelerometer signal in SIMULINK?

## how to generate random accelerometer signal in SIMULINK?

(OP)
Hello,

This is Julia and I am new to SIMULINK.

Can I ask if anyone know how to generate random accelerometer signal in SIMULINK?

I need to use the generated signal for human movement recognition algorithm test purpose.

### RE: how to generate random accelerometer signal in SIMULINK?

Is there anything special about the accelerometer signal? Or is random, random? If so, just look in the Sources library: White Noise, Random Number, Signal Generator can all give you a random signal, for various definitions of random.

If by "random", you don't mean mathematically random and instead mean an arbitrary human movement acceleration signal, then there might be a bit more work to do. In that case, the Band-Limited White Noise might still do the trick, or you might even plug the Random Number into an Integrator or two to get a smoothed random signal.

If even that is too unrealistic, perhaps a number of Signal Generators set to sine function into a Sum block might do the trick?

Anything there close to the mark?

### RE: how to generate random accelerometer signal in SIMULINK?

(OP)
Dear "LiteYear",

Thank you very much for the reply! And my "random" means an arbitary human movement acceleration signal (x, y, z axes).
My project is to develop a software system which detect elderly fall and distinguish normal activities (walking, stand up, sit down, fall).

I need to implement by simulation: Get activity acceleration signals in xyz axes and use those signals in the fall detection algorithm. As there is no hardware included, I guess I need to generate my own random acceleration signal.
According to your suggested ways, I guess I will try to get 3 siganl generators (sine wave function) and sum them together to create my acceleration signal.
Regarding Band-Limited White Noise, I will look into it too!

I don't know whether I ask too much, regarding human movement model (walking, standing up, sitting down, falling), any idea how can I get the equations of the model? Any references that can reconmmend to me?

Thanks!

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