Sine Wave Vibration Testing

SineVIEW Test Module

Searching for those resonances have never been easier with our Sine testing module. Here are some of the main features:

Easy test entry

Enter frequency/amplitude breakpoints in an easy to read table form. Operator can select to control constant or ramped acceleration, velocity, or displacement. Automatically calculate and enter the frequency of intersection between any combination of constant acceleration, velocity, or displacement lines. Over 1024 separate frequency/amplitude breakpoints can be entered, allowing entry of virtually any test spec.

Sweep type

Either linear (Hz/minute or minutes/sweep) or logarithmic (octave/minute, decade/minute, minutes/sweep) sweeps can be specified. Sweep rate can be changed in the test while running.

Test duration

Test duration can be entered in terms of length of time, number of sine wave cycles, or number of sweeps.

Tone tests

Sequences of fixed-frequency tones of a specified acceleration, velocity, or displacement can be run. Looping functions allow easy entry of repeating tone sequences.

Control channels

The control signal can be a single input channel, or configured from 2 to 128 input channels with either multi-channel averaging or multi-channel extremal control.

Frequency Range

Standard frequency range is DC-4,990Hz. The frequency range can be extended up to 50,000Hz with the VR9103 High Frequency option.

Sine Resonance Phase Track & Dwell - SRTD (Optional) VR9105

Transmissibility peaks can be automatically detected from a sine sweep, and then dwell tests run at the detected resonance frequencies for a specified time duration or number of sine wave cycles. In a sine dwell test, the controller can automatically track the resonance frequency to keep the output on resonance even when fatigue damage causes the resonance frequency to shift. Track High Q or sharp resonances with an advanced phase tracking controls that allow you to 'dial in' on a resonance and maintain peak amplitude by way of Phase vs Transmissibility.

Configurable safety limits

The controller can be configured to abort if the controlled acceleration goes above or below the desired level by an operator-configured number of dB. Abort limits can also be enabled for individual monitoring channels. Drive limits can be configured to protect from overdriving your shaker in case of failed accelerometers.

Tracking filters

Input channels have individually selectable tracking filters to remove harmonics and out-of-band noise from the measurements. The tracking filter bandwidth and signal averaging is user configurable.

Data Storage

All of the test data can be stored to the disk for later retrieval. Data storage can be done manually, or programmed to automatically save at user-defined intervals.

Multi-channel Extremal

Allows more than one input channel for control in a control strategy where the highest, lowest or an average of accelerometer readings will be used for control of the test

Large Numerical Readout

A configurable large numeric readout displays the current test frequency and channel amplitudes.

Manual Control

The frequency sweep and amplitude level can be manually controlled through the mouse.

Reference Output-COLA

The second output channel supplies a 1-volt constant amplitude reference signal. The phase of this signal relative to the main output can be fixed at any phase or set to shift at a configurable rate. This signal may be used to trigger a strobe light or other measurement device requiring triggering lock with the output signal.

Data plots

A multitude of graphical display options are available, including peak acceleration, peak velocity, peak-to-peak displacement, output drive, cycle counts, channel-to-channel transmissibility, and phase as a function of either frequency or time. Graphs can be easily auto-scaled or zoomed, and cursors displayed. Data and text annotations can be easily placed on the graphs, with data values updated live as the data changes.

Independent Channel Notching Profiles

Assigns maximum limiting breakpoint profiles to individual channels. The drive output will be limited (or ´notched´) if necessary to keep the input amplitude for that channel below the defined profile. Up to 1024 breakpoints can be entered for each channel, or the limit can be entered simply as a dB level relative to the demand profile. In addition, minimum limits may be defined to boost the drive output if a channel is below a defined profile. The notching profiles may also be used as spectrum abort limits, so that abort limit breakpoint profiles can be assigned to each individual channel, and if that channel reaches the defined limit the test will safely shut down.

Stepped-frequency tests (Optional) VR9107

Stepped frequency sine tests such as those used in MIL-STD-167 are supported. The on and off duration and the step size are programmable.

Accelerometer Calibration Package (Optional) VR9106

Provides an easy interface to calculate accelerometer sensitivity. This will allow the user to perform a sine sweep, controlling on a reference accelerometer, and produce a calibration report suitable for calibration record keeping. Automatically calculates the accelerometer sensitivity at the chosen frequency. Read more...

Dual Phased Output (Optional) VR91-SDP

Dual axis with phase control. The drive output and the aux (COLA) output are both used to drive different shakers. The same profile drives both shakers. Adjustable phase angle between the two outputs +/- 360 degrees. Read about multi shaker control here.

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