SVXMPL_Advanced Impact Test (DAQmx).vi

[bww]

I've been using the example vi "SVXMPL_Advanced Impact Test (DAQmx).vi" from the sound and vibration tool box to perform a roving accelerometer test. The vi works very well however it starts to bog down as more nodes and measurements are taken. In my setup, I am using and impact hammer and a triaxial accel to record data at 15 points on a structure. I performed 5 taps, in the x,y,z directions at each node. For the first third of the test the program responds very quickly, I can tap and see the response almost immediately. Then as the number of tested points grows, it starts to take longer and longer between the tap and seeing the results. In fact near the end of the experiment it was taking +5 minutes to see the results of a tap, to decide to accept or reject. Is this a result of memory running low or? Anybody have any suggestions to improve performance?

Thanks in advance.

Bryan

[JaredRo]

bww,

I did some tests with the example and noticed that my memory usage in Windows Task Manager slowly increases over time as I take more and more measurements.  This implies that there may be a memory leak in the example.  Does your memory usage behave similarly?  A quick solution may be to close any unnecessary programs running on your machine during your tests to free up as much memory as possible.  This will help prevent your system from thrashing.

Adjusting your settings to reduce the number of data points written to file per impact should also help.  This may or may not be an option for you depending on your application.

Corrective Action Report (CAR) #354203 has been filed in our system documenting the performance loss over time as you take measurements.  Which version of the Sound and Vibration Toolkit are you using?  The CAR states that this issue has been resolved in Sound and Vibration Toolkit 2012.

[bww]

Hi Jared,

I am using Sound and Vibration Toolkit 2011. I'll upgrade and try your suggestions.

Regards,

Bryan