Efficient Plant November 2017 - 49

feature | solution focus
low-frequency proximity probe data would
provide a more complete picture of machinery health. High-frequency vibration is
particularly useful in diagnosis and analysis
of several classes of problems in high-speed
turbomachinery. The most widely known
phenomenon involves the set of signals
generated by a pair of meshing gears in a
gearbox. A high-frequency accelerometer
is the preferred sensor for measuring this
important information.
The general guideline for gearbox analysis
is to look at three harmonics of gear mesh
frequencies and their sidebands. Increases
in gear-mesh harmonics and natural gear
frequency are primary indications of a gearing problem, such as gear wear, misalignment, eccentricity, or improper backlash.
The presence of and changes in these
signals are important diagnostic indicators
in assessing the cause and cure of gearing
problems.

FREQUENCY RESPONSE
AND MOUNTING
Vibration literature had previously explained that the frequency response of an
installed accelerometer was highly dependent upon the method used to attach the
sensor to the structure. The contention
was that, of the four common methods for
attaching sensors to mounting locations for
PdM (stud-mounted, adhesive-attached,
magnet-mounted, and hand-held), the first
approach-stud-mounting-provided the
widest frequency response and the most
secure and reliable attachment. The other
methods reduced the upper frequency range
of the sensor.
Yet, despite its performance under ideal
conditions, stud-mounting was not a realistic option for a vibration program that
demanded measurements at hundreds of
points on a monthly basis. The drawbacks
were related to the time- and labor-intensive
nature of this technique.

NOVEMBER 2017

SEARCH FOR A
'QUICK' SOLUTION
As the vibration analysts saw it, their program required a quick-connect/disconnect
strategy that provided accurate readings at
high frequencies. In support of their interest
and needs, PCB offered a variety of sensors
for evaluation, as well as access to its own
test facilities.

PCB's inventory included low-mass,
high-response accelerometers with frequency ranges exceeding 20 kHz, when
properly installed, and rare-earth magnets
for accelerometer mounting. Despite the
general opinion that magnet mounts were
useful only in low-frequency applications
(less than 3 kHz), the vibration analysts
felt it was possible to achieve the desired

STATEMENT OF OWNERSHIP, MANAGEMENT, AND CIRCULATION
Publication Title: EFFICIENT PLANT formerly MAINTENANCE TECHNOLOGY
Publication Number: 0899-5729
Filing Date: September 30, 2017
Number of Issues Published Annually: 12
Annual Subscription Price: $140
Complete Mailing Address of Known Office of Publication:
Applied Technology Media, 535 Plainfield Road, Suite A, Willowbrook, IL 60527
Contact Person: Glen Gudino, President/CEO; Telephone: 630-325-2497
Complete Mailing Address of Headquarters or General Business Office of Publisher:
Applied Technology Media, 535 Plainfield Road, Suite A, Willowbrook, IL 60527
Full Names and Complete Mailing Addresses of Publisher, Editor, and Managing Editor:
Phil Saran, Publisher; Gary L. Parr, Editor; Jane Alexander, Managing Editor;
Applied Technology Media, 535 Plainfield Road, Suite A, Willowbrook, IL 60527
Owner: Glen Gudino; Applied Technology Media, 535 Plainfield Road, Suite A, Willowbrook, IL 60527
Known bondholders, mortgagees, and other security holders owning or holding 1 percent
or more of total amount of bonds, mortgages, or other securities: None
Issue data for circulation data below: September 2017
Extent and nature of circulation:
Avg. no. copies
No. copies of
each issue during
single issue published
preceding 12 months nearest filing date
Total no. copies
40,604
37,912
Paid and/or requested circulation
(1) Paid/Requested Outside County
Mail Subscriptions Stated on Form 3541
30,690
27,600
(2) Paid In-County Subscriptions
Stated on Form 3541
0
0
(3) Sales Through Dealers and Carriers,
Street Vendors, Counter Sales, and
Other Non-USPS Paid Distribution
0
0
(4) Other Classes Mailed Through the USPS
0
0
Total paid and/or requested circulation
30,690
27,600
Free distribution by mail
(1) Outside-County as stated on Form 3541
8,811
9,011
(2) In-County as Stated on Form 3541
0
0
(3) Other Classes Mailed Through the USPS
0
0
Free distribution outside the mail
88
100
Total free distribution
8,899
9,111
Total distribution
39,589
36,711
Copies not distributed
1,016
1,201
Total
40,604
37,912
Percent paid and/or requested circulation
77.52%
75.18%
Requested and Paid Electronic Copies
9,839
12,080
Total Requested and Paid Print Copies +
Requested Paid Electronic Copies
40,259
39,680
Total Requested Copy Distribution +
Requested/Paid Electronic Copies
49,340
48,791
Percent Paid and/or Requested Circulation
(Both Print & Electronic Copies)
82.14%
81.33%
I certify that all information furnished on this form is true and complete. I understand that anyone who
furnishes false or misleading information on this form or who omits material or information requested
on the form may be subject to criminal sanctions (including fines and imprisonment) and/or civil
sanctions (including civil penalties). (signed) Glen Gudino, Owner

EFFICIENTPLANTMAG.COM |

49


http://www.EFFICIENTPLANTMAG.COM

Table of Contents for the Digital Edition of Efficient Plant November 2017

Efficient Plant November 2017 - 1
Efficient Plant November 2017 - Cover1
Efficient Plant November 2017 - Cover2
Efficient Plant November 2017 - 1
Efficient Plant November 2017 - 2
Efficient Plant November 2017 - 3
Efficient Plant November 2017 - 4
Efficient Plant November 2017 - 5
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Efficient Plant November 2017 - Cover3
Efficient Plant November 2017 - Cover4
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