Hello everyone
I am a mechanical engineering student currently working on a project,
wich involves working with an AD22302 Dual-Axis accelerometer.
It is capable of measuring +/- 70g on the x-axis wich is the one I am currently using.
My question is:
what is the accuracy of the device? I am able to find the non-linearity in the datasheet (attached to the post)
but that is about it and I need the overall accuracy. Any kind of help will be highly appreciated
- Jesper
OK, this helps! Thank you. On this type of signal, 70g/50ms, shape probably between a pulse and a half-sine, is the peak acceleration the key objective?
If we were being very conservative, I would say that the difference in the peak shock, with respect to the no-shock output, should be better than 10% accurate, assuming that the majority of the energy…
Hi Mark
Today's testing went really well. The output only deviated from the input by a max of 9.2 % and I had an average deviation of 4.9 % So thank you a lot for the help everything seems to be working…
Hi Mark,
Thank you for the fast response, I am trying to measure the impact force of a punch. I have built a device for this purpose and the basic idea is that you:
1. Hit the black black plate (Wooden plate with 2.5 inch soft padding to increase contact-time between fist and plate).
2. The arm will swing back and the accelerometer (yellow plate on top) will measure the acceleration.
3. The spring under the axle will return the arm to it's original vertical position.
The magnitude is about 10 g's and I know this is a obvious problem, but my testing rig will not go much higher. I have thought about lowering the weight of the plate though.
The contact time of a punch is about 50 ms (measured using a highspeed camera), so to peak acc. there is roughly 20 ms.
Regarding frequency, I have assumed that the pulse from the punch is a step-input and calculated the step-response of the filter and everything seems to be okay with no loss in output signal. If you need futher details let me know and I will do my best to retrieve them.
Best regards - Jesper
Hi Mark,
Thank you for the fast response, I am trying to measure the impact force of a punch. I have built a device for this purpose and the basic idea is that you:
1. Hit the black black plate (Wooden plate with 2.5 inch soft padding to increase contact-time between fist and plate).
2. The arm will swing back and the accelerometer (yellow plate on top) will measure the acceleration.
3. The spring under the axle will return the arm to it's original vertical position.
The magnitude is about 10 g's and I know this is a obvious problem, but my testing rig will not go much higher. I have thought about lowering the weight of the plate though.
The contact time of a punch is about 50 ms (measured using a highspeed camera), so to peak acc. there is roughly 20 ms.
Regarding frequency, I have assumed that the pulse from the punch is a step-input and calculated the step-response of the filter and everything seems to be okay with no loss in output signal. If you need futher details let me know and I will do my best to retrieve them.
Best regards - Jesper
