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Control Applications
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UCON covers the entire test range of control applications for both electro-dynamic and servo-hydraulic shakers. DSP hardware processes real-time responses and equalization calculation, while PC implements test preparation, test data indication, test report generation and other auxiliary applications.
| Available control applications include | Auxiliary applications (optional) include | ||
| 1 | Random | 11 | Profile Editor |
| 2 | Sine on Random (SoR) | 12 | Spectrum Analysis |
| 3 | Random on Random (RoR) | 13 | MATLAB Interface |
| 4 | Sine and Random on Random (SRoR) | 14 | Multi-layer Password Security System |
| 5 | Swept Sine | 15 | Automatic Drive Notching/Limiting Control |
| 6 | Resonance Search Track & Dwell (RSTD) | 16 | High Frequency Random Control (up to 18 kHz) |
| 7 | Classical Shock | 17 | High Frequency Sine Control (up to 10 kHz) |
| 8 | Shock Response Spectrum (SRS) | 18 | Low Frequency Sine Control (low to 0.01Hz) |
| 9 | Transient Time History (TTH) | 19 | Digital I/O interfaces |
| 10 | Long Time History for Road Simulation (LTH) | 20 | Multi-channel Control Strategies |
Random
Random performs fast, accurate, real-time multi-channel close-loop control of PSD profiles. Based on advanced adaptive control algorithm, the system responds quickly and precisely to changes of non-linear characteristics, resonance frequency and loading.
Specifications:
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0 to 4,680 Hz, extendable to 18, 750 Hz |
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100, 200, 400, 800, 1600, 3200, 6400 lines, extendable to 6400 lines |
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Up to 95 dB |
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Equal to frame time |
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Up to 1000 Degree of Freedom |
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±1dB at 99% confidence within 200 DOFs |
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VT-9002: Single Channel VT-9008/VT-9016: Single Channel, Weighted Average, Minimum, Maximum |
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3 to 6 Sigma |
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True Gaussian distribution |
Profile
| Breakpoints | Breakpoint table with unlimited combination of PSD levels with slope (dB/octave) at user-defined frequencies. |  Random Test |
| Units | English, Metric, User-defined. | |
| Abort/Alarm | High and low profile limits specified at each breakpoint in dB with respect to reference. RMS high and low limits calculated automatically from profiles or user-defined. | |
| Profile View | Profile graphics shown and updated as profile is created. Automatic listing of RMS acceleration and displacement values for profile. Profile operating levels are compared to the shaker parameter table. |
Configurable Safety Limits
To protect the test article and shaker system, configurable acceleration limits can be set as dB/sec by the user. The control input is also verified against shaker acceleration and displacement limits.
Sine on Random (SoR)
SoR performs with up to 12 sine tones superimposed on the background random spectrum. Each tone is independent, swept back-and-forth between frequencies at an user programmable rate. The amplitude and sweep parameters (in Oct/min or Hz/sec) are both user programmable.
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Specifications
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Test & Level Scheduling
Tests can be scheduled to run a user-defined length of time, the spectrum level can be scaled by a specified dB-level, percentage or scaled for a specified RMS acceleration. Level schedules can be entered to run various durations at different acceleration levels.
Configurable Safety Limits
To protect the test article and shaker system, configurable acceleration limits can be set as dB/sec by the user. The control input is also verified against shaker acceleration and displacement limits.
Random on Random (RoR)
RoR performs with up to 12 narrow spectral bands superimposed on the background broad random spectrum. Each band is independent, the amplitude, bandwidth and frequency sweep parameters are all user programmable.
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Specifications
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Test & Level Scheduling
Tests can be scheduled to run a user-defined length of time, the spectrum level can be scaled by a specified dB-level, percentage or scaled for a specified RMS acceleration. Level schedules can be entered to run various durations at different acceleration levels.
Configurable Safety Limits
To protect the test article and shaker system, configurable acceleration limits can be set dB/sec by the user. The control input is also verified against shaker acceleration and displacement limits.
Sine, Random on Random (SRoR)
Analog sine sweeps and narrow band Gaussian random sweeps on continuous wide band Gaussian random distribution, with up to 12 sine tones and 12 narrow bands.Independent profile for each band.Parameters in each band are all user programmable.
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Specifications
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Test & Level Scheduling
Compliant with SoR and RoR.
Configurable Safety Limits
To protect the test article and shaker system, configurable acceleration limits can be set dB/sec by the user. The control input is also verified against shaker acceleration and displacement limits.
Sine
Sine performs close-loop control to sine vibration. The advanced adaptive control algorithm provides time and frequency calculations using floating point calculations, resulting in frequency changes as small as 1 milli-Hertz to generate a smooth and continuous sweep.
Specifications:
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1 to 5,000 Hz, extendable to10, 000Hz upwards and 0.01Hz downwards |
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Up to 95 dB |
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Typically 5 msec |
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±1dB through a peak-notch with a Q of 50, at 1 octave/min |
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Adaptive or fixed 0.3 to 3,000 dB/sec |
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Single Channel (VT-9002) Single Channel, Weighted Averaging, Minimum, Maximum (VT-9008, VT-9016) |
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Linear from zero to 6,000 Hz/min Logarithmic from zero to 100 octave/min. |
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User specified dwell frequency with duration in cycles or time. |
Profile
| Reference profile | Unlimited combination of amplitudes (A, V or D) and slopes (dB/octave) at user defined frequencies. |  Sine Test |
| Units | English, Metric, User-defined. | |
| Abort/Alarm | High and low profile limits specified at each breakpoint in dB with respect to reference. | |
| Profile View | Profile graphics shown and updated as profile is created. The test maximum peak acceleration, peak velocity, and peak to peak displacement values are displayed. | |
| Editing | Based on table, or calculate manually, constant value profile. | |
Safety |
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| Input Signal Checks | Rapid detection of open loop, input overload, and loss of signal and requiring a shut-down. Non-control channels can be also used with RMS monitor limits. | |
| Shutdown | Shutdown is at a smooth rate and Emergency stop is immediate. | |
Configurable Safety Limits
To protect the test article and shaker system, configurable acceleration limits can be set as dB/sec by the user. The control input is also verified against shaker acceleration and displacement limits.
Resonance Search Track & Dwell (RSTD)
RSTD performs resonance point track and dwell. Based on advanced transfer function adaptive control algorithm, the system responds to the change of the non linear characteristics, resonance frequency and load quickly and precisely.
Specifications:
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 Resonance Search Track & Dwell Control Test |
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Resonance Search
Set the test to generate a sweep, and then identify the resonance points based on Q (Quality factor) and/or amplitude ratio of transfer function.
Pick the Resonance Points
After the resonances are identified, the operator can select which ones to run, and the duration of the test.
Dwell
There are two dwell modes for RSTD: frequency lockup dwell and resonance track dwell.
Classical Shock
Classical Shock performs fast, accurate and real-time multi-channel close-loop control of transient waveforms. The entire transient period is sampled simultaneously without gap. Based on advanced transfer function adaptive control algorithm, the system responds to the change of the non linear characteristics, resonance frequency and load quickly and precisely.
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Specifications
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Shock Pulse
| Classical pulse types | Half-sine, Haversine, initial and terminal peak sawtooth, triangle, rectangle, and trapezoid. |
| Inverting | Pulses can be inverted in shape. |
| Pulse Compensation | Pre- and post-pulse, post-pulse only, or prepulse only; single or double sides for minimum acceleration and fully use of shaker stroke. |
| Pulse delay | User specified in seconds. |
| Profile View | Profile graphics shown and updated as profile is created. Profile operating levels are compared to the shaker parameter table. |
| Criterion | ISO, MIL-STD-810 |
Shock Response Spectrum (SRS)
Shock test has become one of the environmental simulation test to detect and unveil design flaws.SRS automatically generates the time-domain waveform, and exert control based on transmission characteristics, according to the Shock Response Spectrum, using the wavelet integrated approach.
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Specifications
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Transient Time History (TTH)
TTH can be used to simulate the seismic waves.TTH may output sine wave, chirp, white noise, and other measured data of the target waveform. TTH may the adjust amplitude and polarity of the waveform through ratio coefficient, and also intercepte of the waveform.
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Specifications
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Long Time History for Load Simulation (LTH)
LTH is able to define more complex test spectrums, and accurately reproduce the vibration environment. It can extract a vibration test spectrum from a vibration environment where the product is being used or in transition, which also called as road simulation.
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Specifications
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