Visual ODS ProTM

VT-420

Credit: Full Spectrum Diagnostics

The Visual ODS Pro™ package lets you see how a machine or structure is moving by animating ODS’s directly from a set of time of frequency domain experimental and combines the features of the VES-3600 Advanced Signal Processing option. The Advanced Signal Processing option includes an FFT for analyzing data in either the time or frequency domain, plus waveform cut, copy and paste, and many other signal processing, acoustics analysis, and Multiple Input, Multiple Output (MIMO) features.

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Visual ODS Pro™ Features

  • Simultaneous FFT & IFFT on all measurements in a Data Block. The FFT will transform any number of samples, and is not restricted to a power-of-2
  • Integration & differentiation of time or frequency signals
  • Cut, Copy & Paste of time or frequency signals
  • DC Removal of time or frequency signals
  • Sort & Select waveforms
  • Notch & Band windows for removing unwanted data from time or frequency waveforms
  • Force and exponential windows to remove noise and leakage from impulse response measurements
  • A flat top window for obtaining accurate narrow band signal amplitudes
  • A Hanning window for minimizing leakage effects in frequency spectra
  • Calculation of Fourier Spectra, Auto Spectra, PSDs & ODS-FRFs from time domain operating data
  • Signal processing includes, Rectangular, Hanning, or Flat Top time domain windows, triggering, linear or peak hold spectrum averaging, and overlap processing
  • ODS-FRFs can be calculated either from Auto & Cross Spectra or from Transmissibility’s and reference Auto Spectra
  • Order-tracked ODS’s can be displayed directly from multi-channel Order-tracked response only data
  • Block Math functions include complex scaling, add, subtract, multiply, divide, conjugate, and more
  • Units conversion and scaling between Linear (RMS) and Power (MS)
  • Measurement scaling between Peak, Peak to Peak, and RMS
  • Waveform statistics (Minimum, Maximum, Mean Squared, RMS, Variance, Standard Deviation, Absolute Deviation, Power, Linear Power, Crest Factor, Skew, Kurtosis)
  • Shape Integration & differentiation
  • Shape Cut, Copy & Paste
  • Sort & Select of shapes and shape components (DOFs)
  • Calculates a shape product, for locating nodal points and lines among all shapes
  • Acoustic Intensity, Sound Pressure Level (SPL), Sound Power, and ODS’s from either Octave or Narrow Band measurements can also be calculated and displayed in animation.  Vibro-acoustic data (acoustics & vibration), can be displayed on the same structure model, thus allowing you to correlate surface vibration with acoustic field measurements.
  • Animated display of vibro-acoustic data (acoustic & vibration)
  • 1/1, 1/3rd, 1/12th, 1/24th octave band measurements are displayed in bar chart format
  • Magnitudes can be displayed in Linear, Log, dB, dB Reference units
  • Acoustic Intensity is calculated from Cross Spectra or time waveforms
  • Sound Power through a surface is calculated from Acoustic Intensity
  • Narrow band can be converted to octave band measurements
  • A, B & C weighting can be applied to narrow band or octave band measurements
  • Noise sources can be ranked in a bar chart based on percentage of overall, dB, or watts.
  • Measurements can be tone-calibrated, using tone magnitude & phase
  • VT-420 also includes advanced processing features for calculating multiple Inputs, multiple Outputs or MIMO FRFs.  It utilizes a Multiple-Input Multiple-Output matrix model to calculate the following:
  • Multiple Forced Responses. Multiple time or frequency Outputs waveforms are calculated from multiple time or frequency Input waveforms
  • Force Path Analysis. Multiple time or frequency Input waveforms are calculated from multiple time or frequency Outputs
  • MIMO FRFs. FRFs are calculated from simultaneously acquired multiple Input & Output time waveforms. Multiple & Partial Coherence can also be calculated with MIMO FRFs
  • MIMO Forced Response: Calculates multiple response time or frequency waveforms (outputs) caused by multiple excitation forces (inputs), using either FRFs or mode shapes to model the system dynamics
  • MIMO Sinusoidal Forced Response. Calculates and displays response (output) shapes caused by multiple sinusoidal excitation (input) forces, using either FRFs or mode shapes to model the system dynamics
  • MIMO Force Path Analysis. Calculates multiple excitation force time or frequency waveforms from multiple response (outputs), using either FRFs or mode shapes to model the system dynamics
  • MIMO FRFs (Transfer functions). These frequency functions can be calculated from multiple excitation (input) and response (output) time waveforms, using Rectangular or Hanning time domain windows, triggering, linear or peak hold spectrum averaging, and overlap processing
  • Multiple and Partial Coherences. These frequency functions can also be calculated together with MIMO FRFs. Multiple Coherence measures the overall contribution of all measured excitation forces (inputs) to each measured response (output), for each frequency. Partial Coherence measures the contribution of each measured excitation force (input) to each measured response (output), for each frequency.
  • MIMO FRFs (Transfer functions) can be calculated from multi-channel Auto & Cross frequency spectra

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