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DAU FOR MODIFICATION AND CAPABILITY TESTING
AEROSPACETESTINGINTERNATIONAL.COM // JUNE 91
OPERATIONAL MODAL
ANALYSIS IS ON THE RISE
Traditionally, modal testing has been done
using an impact hammer or one or more
modal exciters to excite the structure with a
measured input force. In recent years, a
complementary method has become widely
used: Operational Modal Analysis (OMA).
In OMA, the excitation of the structure
comes from the unmeasured natural ambient
and operating forces. This makes it possible
to do accurate modal parameter identification
under actual operating conditions, and in
situations where it is difficult or impossible to
artificially excite the structure.
In the aerospace industry, OMA is today
used for a variety of tests where classical
modal analysis is impossible to do or would
produce erroneous results. This includes
engine testing and flight testing of aircraft and
Advancements in technology and new
platforms including hypersonic weapons
and unmanned autonomous systems have
opened up the need for small, lightweight
measurement capabilities.
Once simulation testing has run its course,
the next phase is physical testing. With a
single test taking days or weeks to set up, one
thing that current flight test instrumentation
(FTI) doesn’t readily support is last minute
changes. Once installed, most FTI systems
can’t easily be moved, many are too big for
small test articles, and tight schedules often
require pre-wired payload attachments.
California-based Diversified Technical
Systems specializes in miniature data
Curtiss-Wright ...........................................................................................................................................................17
Aerospace Testing International ...............................................................................................................37
AIM GmbH (c/o AIM UK) .................................................................................................................................69
Bruel & Kjaer Sound & Vibration Measurement A/S .........................Inside Back Cover
Climats ..........................................................................................................................................................................69
Dewesoft .....................................................................................................................................................................65
Dolphitech AS...................................................................................................................Inside Front Cover
dSpace GmbH .......................................................................................................................................................... 15
DTS - Diversified Technical Systems .....................................................................................................30
Elsys AG........................................................................................................................................................................66
FMV ................................................................................................................................................................................... 61
G Systems.....................................................................................................................................................................12
Glenn L. Martin Wind Tunnel .......................................................................................................................75
IMV Corporation .....................................................................................................................................................46
Instron ...........................................................................................................................................................................49
Kistler .............................................................................................................................................................................66
Lumistar Inc ............................................................................................................................................................... 41
M&P International Mess-und Rechnertechnik ........................................................................... 25
Marposs SPA ............................................................................................................................................................29
Meggitt Sensing Systems ..............................................................................................................................38
New Wave Design & Verification .............................................................................................................29
North Star Imaging Inc ........................................................................................................................................3
PCB Piezotronics Inc .......................................................................................................................................... 33
Photron USA Inc .....................................................................................................................................................22
Precision Filters Inc .............................................................................................................................................37
Scanivalve Corp .....................................................................................................................................................89
Siemens Industry Software NV .......................................................................Outside Back Cover
Space Tech Expo 2019 ...................................................................................................................................... 82
TEAC Europe GmbH ............................................................................................................................................38
Telspan Data ................................................................................................................................................................9
Test Fuchs GmbH ...................................................................................................................................................75
TESTIA (Formerly NDT Expert) .................................................................................................................... 61
Vector Informatik ....................................................................................................................................................21
Vibration Research..............................................................................................................................................45
Vision Research .....................................................................................................................................................30
Weiss Umwelttechnik GmbH ....................................................................................................................... 41
Zodiac Aerospace ................................................................................................................................................55
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helicopters. Tests are done
under operating conditions
as close as possible to reallife
conditions.
As natural input is used in
OMA, it is typically not
controllable. One challenge
can be the content of
harmonic components
originating from rotating
parts. If these components are close to the
natural frequencies of interest, they must be
removed prior to the modal parameter
identification. There are highly effective
techniques available today, but because the
harmonic components can be quite
dominant, a data acquisition system with a
high dynamic range is needed. \\
acquisition units (DAU). Each DTS system is
optimized for low size, weight and power
(SWaP), including the new SLICE6 AIR. The
42 x 42 x 13mm, 6-channel module weighs
50g and can be used standalone, networked
for higher channel counts or integrated into
existing Ethernet-based FTI.
Each SLICE6 AIR features analog signal
conditioning, a microprocessor, an Ethernet
switch and flash memory for quick setup,
independent from the central DAU typically
located on aircraft.
The SLICE6 AIR is designed to be
positioned near the sensors which eliminates
long cable runs and makes it ideal for quick
deployment. It also supports onboard
recording to flash memory and features
real-time streaming in IRIG formats for
added flexibility.
Huy Nguyen, DTS aerospace and
defense sales manager said,
“This DAU allows flight test
engineers to capture sensor
measurements in areas that
were previously size or space
prohibited, like rotorcraft or
unmanned systems.”\\
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