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JAGUAR Mixed-Mode
Spectral Dynamics’ Mixed-Mode is a true
closed-loop controlled test in every respect. Tones, bands and
the broadband base are each controlled to the specified shapes
and tolerances.
A multi-dimensional least squares approach is used in which
Amplitude and Phase of Sine Tones are accommodated and true
digital Tracking Filters are invoked as eeded during Sine sweeps
or dwells.
Mixed-Mode Principal Features:
Independent definition of Broadband, Narrowband and Sine Tones.
Up to 50 controlled Narrowband or Sine Tone components.
Each Sine Tone can be defined with its own Profile of up to 40
breakpoints.
True Gaussian random signal generation for Broadband Random and
Narrowbands. True, continuous Sine sweeps;not FFT-based steps.
Tones and Bands may sweep in the same or opposite directions and
even cross each other during the sweeps. If a harmonic set of
Tones is defined as stationary, the Tone drives remain in-Phase
during a Mixed-Mode test.
Tones and Bands may have their sweeps stopped or reversed,
individually, during a test and have their test levels lowered
or shut off and then reestablished through operator control.
Automatic Test Scheduling of up to 100 Mixed-Mode test setups
can be performed.
Test results may be displayed in real-time and/or stored to disk
for all active channels.
Unique to JAGUAR, Mixed-Mode avoids the traditional problem of
“hole” creation in the broadband random, sometimes referred
to as a “traveling notch. ” By virtue of its ability to know
in advance when and where the tones and/or narrow bands were to
be located, Mixed-Mode modifies the reference at that unique
location to allow the introduction of the new energy. Similarly,
when the energy moves to a different location in the spectrum,
the reference is instantly restored. In this way the “hole”
never materializes.
Mixed-Mode is a Signature software package from Spectral
Dynamics which provides great flexibility and on-line control of
a wide variety of complex test scenarios.
Whether performing tests on automotive assemblies or recreating
profiles from MIL-STD 810-F, JAGUAR Mixed-Mode provides the
features, displays, real-time control and data results that are
traditionally associated with Spectral Dynamics.
There are some vibration responses encountered in wheeled or
tracked vehicles, helicopters and fixed-wing aircraft, airborne
missiles and rapid- fire guns that almost defy description.
These can create vibration levels of such a destructive nature
that they must be very carefully simulated, or correlation to
real-world events will be impossible and repeatability only a
myth. These simulations often require a vibration combination
which includes a broadband Random background, stationary or
moving narrow bands of Random with sweeping or fixed Sine tones
all mixed together. If sensitive electronics, such as
Command/Control transceivers are subjected to these
environments, it is crucial that a correct and repeatable
control strategy be employed lest uncontrolled drive levels
cause unwarranted damage to product and personnel.
The patented techniques employed by Spectral Dynamics assure
that every element of the test is fully controlled and
displayed. No open-loop summations here. Dynamic Signal
Processing with true, digital Tracking Filters invoked where
necessary creates an incredibly accurate simulation with
real-time displays. And, individual Tones and Bands may be
turned on and off or reversed in sweep direction during the live
test. |
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