Test waveform

[valpe]

Hello everybody,
I have to make a shock test, the specification says:
Maximum absolute acceleration 10 g´s
Maximum spectral velocity 1.3 m/s
Maximum relative displacement 20 milimeters
Does anyone know how to generate a test waveform that fullfil this requirements?
Thank you
Regards

 

[FeX32]

What are you testing?



Fe

 

[valpe]

Is a box with inner electronics devices. Weight about 15 kgrs. Dimensions 500x300x300.

 

[GregLocock]

What does it mean by spectral velocity?

I wouldn't be amazed if a half sine displacement with a 20mm amplitude and an appropriate duration worked.



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[valpe]

Thank you Greg,
I have been looking for information and I have find tha it could be the datum for a "tripartite papper" or four coordinate papper, but I don´t know how generate a waveform (excitation) which I can manage to the shaker, and which fulfill the requirements. If it could be a half sine, how could I calculate it?
Regards

 

[GregLocock]

Until you can define spectral velocity you can't do it.

You just need to integrate your acceleration waveform once to get velocity, and again to get displacement.

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.