| Tip of the
Month |
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Air bearing
shakers dramatically improve the quality of the calibration
mechanical input and the uncertanties of corresponding results
compared to traditional flexure-based shakers. By minimizing
or eliminating transverse motion due to lateral resonances, the
air bearing design provides increased stiffness properties compared
to mechanical flexures. The increased stiffness effectively
shifts lateral resonances to much higher frequencies and out of the
calibration response range. |
| Newsletter
Archive |
ICP triaxial accels aid vehicle field diagnostics; New
transverse methods of cal
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Smart Wind
Turbine Blades |
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With the enormous
infrastructure investment in renewable energy sources and wind
power, it's clear that performance monitoring and health/maintenance
will be "behemoth" areas of importance. Researchers at
the Purdue Center for
Systems Integrity have been working on
a performance, health and prognostics system that imbeds a small
array of rugged, high fidelity, piezoelectric dynamic ICP
accelerometers and capacitive DC accelerometers within the turbine
blades for continuous monitoring. Click on the link below for
an article, published in the July 2009 issue of Power
Magazine, on the development and benefits of smart wind turbine
blades.
http://www.powermag.com/issues/departments/global_monitor/"Smart-Turbine-Blades"-to-Improve-Wind-Power_2014.html |
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Is my
calibration shaker still good
enough? |
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After years of "wear
and tear" on your calibration shaker does it still meet the ISO16063-21 transverse
performance recommendations? Most flexure based calibration
exciters have resonances so that at certain frequencies your sensor
under test is moving more in the lateral direction than it is in the
primary axis of sensitivity. You may be surprised by what you
don't know and how it may not be properly accounted for in your measurement system
uncertainty budget. In some cases the ignored cross-axis
motion can more than double the true uncertainty budget...
Click on the link below to learn the effects of high transverse
inputs on accelerometer calibration.
http://www.modalshop.com/filelibrary/The%20Effect%20of%20High%20Transverse%20Inputs%20on%20Accel%20Calib.pdf |
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We hope
that you've enjoyed our newsletter and its educational content over
the last few years. No where like the calibration field is
certainty and reliability more important. We've been around for
20 years. We're part of the PCB Group which is going on 45
years. We're here to serve you with all your dynamic sensor
and calibration needs... whenever you need
help!
Sincerely, |
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Michael J. Lally The Modal Shop
A PCB Group Company
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