measure vibration using sb rio

[irfan789]

hello

i have tried to measure the vibration suing NI SOUND AND VIBRATION SIGNAL SIMULATOR OF sensitivity 175mv/g and 6000rpm

using BNC connectors i have acquired X and Y axis accelerometer readings... but i feel the values doesnt vary and most of it doesnt have any kind of pattern so how can i know are those values right or wrong ...

here is the VI execcuted on Real time using sbRIO and measurement is done using unbalanced fan in the simulator..\

please find the attachment

kindly suggest where i ahve gone wrong and i would like to control the vibrations by controlling the fan speed

[preston_johnson]

Thanks for posting your question. 

For waveform acquisition, consider using the waveform acquisition reference library and design:

https://www.ni.com/en/support/documentation/supplemental/09/ni-compactrio-waveform-reference-library...

For controlling the fan speed,  you will want to put your control in the FPGA, and use speed as the process input to control. 

https://forums.ni.com/t5/Example-Code/Decoding-Tachometer-Signals-Using-CompactRIO-and-LabVIEW-FPGA/...

I have found using a PID with analog output as my control this works pretty well.  consider a very high gain and execute the PID each time a tachometer pulse arrives. 

hope this helps. 

[irfan789]

i am using fpga and RT for controlling the fan..

so i have few steps like 

1.acquiring vibrations and measuring the speed of the fan

2.control of fan speed 

may i know which code i have to keep in RT and FPGA... please help me out