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Any vibration analysts in the house?

rbmgf7

Aluminum
Joined
Oct 18, 2017
I'm trying to upgrade an old, antiquated analog vibration analyzer in our facility to something modern. I'm doing this based on a few reasons but mostly because our products get retested by the customer so I wanted to mimic their testing equipment and procedures to eliminate discrepancies (we've recently had problems so I'm trying to get ahead and resolve before it gets worse). I'm not a vibration specialist nor know anything about it. Just learning as I go.

Customer uses IFM equipment so I got IFM to build me a nearly identical setup. It's also using IFM's VES004 software. The test specifications for the customer are not to exceed 0.05 mils from 0-32000 CPM and 0.005 in/s at 32000-90000 CPM. These seem pretty tight since at rest, the sensors generate at least 0.02 mils.

Well, to just calibrate the sensors, we have a handheld vibration generator that creates 1g at 159.2Hz. When I calibrate the sensors, I get the correct Hz but only seems to read 920-970mg and then can have a spread of 30-50mg between the sensors. I'm talking to IFM about how to adjust the gain but at the moment, it doesn't seem like you can. Their software couldn't even scale to 0.00X units for velocity which leads me to think these specs are pretty tight (0.01 is the lowest).

Apparently these sensors come calibrated from the factory. They also claim to have a 0.2% accuracy which 950mg from 1g is 5%, correct?

Thanks.
 

specfab

Titanium
Joined
May 28, 2005
Location
AZ
If you have a setup which duplicates your customer's equipment, I'd suggest you get together with your contact there and try to have a detailed discussion about their usage of the software, and how they do their calibrations, and their test environment including what sort of fixturing and test bench they have. Vibration testing is something of an art within the basic science, and like FEA, setup has a great deal to do with results.
 








 
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