Options
Options add various features to the basic VT-620 ME'scopeVES package. Options can be combined to upgrade to more powerful packages and can be ordered based upon your individual needs.
VES-3000 Signal Processing
VES-3000 contains an FFT & Inverse FFT that make it easy to analyze signals and animate ODS's from either time or frequency domain data. It also includes Notch, Band & Exponential windowing so that selected ranges of data can be analyzed, and unwanted portions removed. It also includes waveform Cut, Copy & Paste, waveform integration & differentiation, and other waveform math functions. This Option also calculates Fourier Spectra, Auto & Cross Spectra, PSDs and ODS FRFs using windowing, triggering, averaging and overlap processing. A set of ODS FRFs provides a true measure of the amplitude & phase of each measured DOF and can be used for ODS animation and Operating Modal Analysis.
Prime Factor FFT, allows simultaneous FFT or Inverse FFT on all measurements in a Data Block letting you analyze data in either the time or frequency domain. The Prime Factor FFT supports large blocks of data and non power of 2 blocks of data.
Time and frequency domain integration & differentiation.
Waveform Cut, Copy & Paste.
Notch & Band Pass windows for removing unwanted data.
Exponential window for removing noise or sharpening resonance peaks.
Overall Power, Power in Band and Average Value in Band calculations.
- Signal Processing
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- Calculates Linear (Fourier) Spectra, Auto Power Spectra, & PSDs from time waveforms, using time windows, spectrum averaging and overlap processing.
- Calculates ODS FRFs from time waveforms or from Auto & Cross Power Spectra.
- Choice of Rectangular, Hanning & Flat Top time windows.
- Choice of Linear or Peak Hold spectrum averaging with overlap processing.
- Processes order tracked measurements to display Order Tracked ODS's (running modes).
VES-4000 Modal Analysis
VES-4000 estimates modal parameters (frequency, damping & mode shape) by curve fitting a set of FRFs. It includes several types of mode indicator functions for locating and counting resonance peaks, plus several curve fitting methods, including the MDOF rational fraction polynomial method and the SDOF peak and co-quad methods. FRFs can also be synthesized from modal parameters for comparison with experimental data.
Features Include:
- Interactive curve fitting of measurements using a variety of methods
- SDOF Co-Quad and Peak curve fitters.
- MDOF Rational Fraction Polynomial curve fitter with residual mode compensation.
- Operating Modes - Curve fit operating data (when excitation forces cannot be measured) and extract modal parameters.
- Quick Fit - one step MDOF curve fitting to rapidly obtain mode shapes.
- Mode Indicator (Modal Peaks Function) for determining where and how many modes are represented in a set of measurements.
- Synthesize FRFs from either experimental or analytical modal parameters.
VES-4550 Multi-Reference Modal Analysis
Includes all of the features of the Modal Analysis Option, plus several advanced multiple reference methods for identifying closely coupled modes and repeated roots. It also includes Stability and Pole diagrams for finding stable pole estimates from
a set of multi-reference measurements. It also includes the Modal Assurance Criterion
(MAC for correlating mode shapes, a mode shape Complexity plot, and more.
Features Include:
- Advanced Curve Fitting
- MDOF Complex Exponential time domain curve fitting.
- Multiple Reference curve fitting.
- CMIF (Complex Mode Indicator Function) and MMIF (Multivariate Mode Indicator Function) to indicate closely coupled modes or repeated roots.
- Stability Diagram to show mode frequency & damping estimate stability.
- MAC and CoMAC Tables and Manhattan Plots.
- Complexity Plot for mode shapes or ODS's.
- Measurement and ODS Magnitude Ranking
VES-4750 Operating Modal Analysis
For cases where excitation forces cannot be measured and only operating responses can be acquired, modal parameters can be extracted from a set of specially processed Cross Spectra or ODS FRFs. This option adds special windowing and other features to the Multi-Reference Modal Analysis Option, and provides a complete set of capabilities for extracting modal parameters from measurements made in any type of testing environment.
VES-3550 (MIMO) Modeling & Simulation
VES-3550 uses a Multi-Input Multi-Output (MIMO) matrix model to calculate structural responses due to multiple excitation forces. FRFs or modal parameters can be used in the model. Force path analysis can also be done by calculating excitation forces that cause measured structural responses. MIMO FRFs, multiple and partial coherences can also be post-processed from acquired response & excitation time signals or Auto & Cross Power spectra.
VES-5000 Structural Dynamics Modifications
VES-5000 allows you investigate the effects of physical changes to a machine or structure on its modes of vibration. Physical changes are modeled by adding springs, masses, dampers, rods, bars, plates, and solid finite elements to a structure model.
SDM also allows you to model the effects of tuned vibration absorbers (mass, spring, dampers), and perform sub-structuring. This option also includes Resonance Specification for determining how much modification is necessary to change the modal parameters of a structure to prescribed values.
Features Include:
- Structural Modifications
- Modal Sensitivity Analysis
- Substructuring
- Mode Shape Scaling using known modifications
- Solves for modes of simple FEA models
- Elements available
- Point Mass, Linear Spring & Damper elements
- Rod and Beam elements
- Triangular and Quadrilateral plate elements
- Tetrahedron, Prism and Brick solid elements
- Tuned Absorber
VES-6000 allows you to post-process and display Acoustic Intensity, Sound Pressure Level (SPL), Sound Power, Octave and Narrow Band measurement data. You can also display acoustic shapes and vibration data together in the same picture, so that surface vibrations can be correlated with acoustic field measurements.
Features Include:
- Interactive Drawing of 3D Acoustic Surfaces including shoe box and exploded view surfaces.
- Drawing Assistant to automatically generate Acoustic Surfaces.
- Interactive animated display of acoustic data on an Acoustic surface using contour lines, color maps, arrows or text.
- Display narrow band or 1/1/, 1/3, 1/12 or 1/24 octave band measurements.
- Calculate Acoustic Intensity from Cross Power Spectrum or time domain microphone data.
- Convert narrow band to octave band measurements.
- A, B & C weighting of narrow band or octave band measurements.
- Noise source ranking based on Sound Power, SPL or Intensity.
- Magnitude and phase tone calibration.
- Combined animated display of multiple data types (vibration & acoustic), (intensity & sound power), etc.
VES-8000 Finite Element Analysis (FEA) Option
VES-8000 calculates the normal or complex modes of a structure from a finite element model. It contains a library of finite elements which includes springs, masses, dampers, rods, bars, plates, and solid elements. It also includes the FEA assistant for quickly populating any structure model with finite elements. Mode shape expansions are also obtained from an FEA model and experimental data. FEA models can also be imported and exported in several popular FEA file formats, including the NASTRAN format.
VES-9000 FEA Model Updating Option
VES-9000 finds the 10 Best solutions that update properties of an FEA model so that its modes more closely match a set of experimental modes. Property changes include mass, spring, and damper changes, rod element cross sectional area, beam element cross sectional area and inertias, plate element thicknesses and material properties (elasticity, Poissons ratio, & density).