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VT-620 Visual ODS

An ODS shows how your machine or structure is moving, and whether or not there are excessive vibration levels. ME'scopeVES has been specifically designed to make it easier for you to observe and analyze a variety of vibration and acoustics problems in machines and structures. By animating the ODS's of a structure in slow motion, you can see what can't be seen any other way; a structure's overall motion and the motion of one part relative to another. Excessive vibration levels and loose or damaged parts are easily identified from an ODS display.

Visual ODS lets you see how a machine or structure is moving by animating ODS's directly from a set of time domain of frequency domain experimental data.

As an example of the practical use of Visual ODS, a blower fan located on the roof of a building was experiencing severe vibrations, throwing off belts, and creating high noise and vibration levels throughout the building. All attempts to balance the fan had not solved the problem.

A set of ODS data was taken while the fan was running, using a single channel analyzer with a tachometer signal. A set of Peak & Phase data at the operating speed of the motor was acquired. The animating ODS shows that the base of the motor at the end opposite the belt was moving out of phase with the motor . Removing some paint from the base of the motor revealed a previously undetected crack in the motor mount. After repairing the crack, the fan was re-balanced and the severe vibration and noise problems were eliminated.

VT-620 Visual ODS is the base for all ME'scopeVES Packages

All Packages Include:

Time and Frequency Domain Measurements Shape Data Animation of ODS's

VT-420 Visual ODS Pro

Visual ODS Pro includes all of the features of Visual ODS, plus VES-3000 Signal Processinng which provides advanced signal processing and analysis features. Visual ODS Pro includes an FFT for analyzing data in either the time or frequency domain. If also contains the unique capability to process operating (response only) data to obtain a set of ODS FRFs measurements. ODS's can be displayed directly from a set of ODS FRFs. They can also be curve fit (using a Visual Modal option) to obtain operating mode shapes.

Additional Features:

VT-570 Visual Modal

Visual Modal includes all of the features of Visual ODS Pro, plus VES-4000 Modal Analysis which provides features for processing vibration measurements to obtain modal parameters. With Visual Modal you can identify the frequency, damping & mode shape of the modes of a structure from experimental data.

Additional Features:

VT-550 Visual Modal Pro

Visual Modal Pro adds features to Visual Modalwith both VES-3500 MIMO Modeling & Simulation and VES-4500 Multi-Reference Modal Analysis.

Visual Modal Pro includes advanced curve fitting methods like Multiple Reference curve fitting. This gives you the power to isolate repeated roots or closely coupled modes. Visual Modal Pro also includes advanced processing features such as MIMO Analysis. With MIMO Analysis you can calculate Multiple Reference FRFs even if your analyzer does not include this functionality.

For example, a bridge in Europe was tested using multiple shakers. Using Visual Modal Pro, the acquired time domain force and response data was post-processed to calculate a set of multiple reference FRFs. The resulting FRFs were the curve fit and the mode shapes of the bridge displayed in animation. A typical mode shape display is shown here.

Additional Features:

VT-540 Visual SDM & VT-560 Visual SDM Pro

VT-540 Visual SDM includes all of the features of Visual Modal, plus VES-5000 Structural Modifications. VT-560 Visual SDM Pro includes all of the features of Visual Modal Pro, plus VES-5000 Structural Modifications.

Once you've determined that there is a resonance problem in your machine or structure, the next question is, "How can the problem be fixed?"

Visual SDM & Visual SDM Pro help you investigate alternative solutions to resonance problems. Visual SDM & Visual SDM Pro adds additional tools for investigating structural modifications to all of the ODS and modal analysis features of either Visual Modal or Visual Modal Pro. The Structural Dynamics Modification (SDM) method lets you simulate the effects that a variety of potential modifications will have on the resonances of a structure without having to actually make them.

The resonances (modes) of a machine or structure depend on its physical properties (geometry, density, elasticity, boundary conditions, etc.). Changing the physical properties by adding brackets, stiffeners, tuned absorbers or other modifications, will affect the modes. Using Visual SDM or Visual SDM Pro, modifications are modeled using standard finite elements such as springs, masses, bars and plates. Then, using the mode shapes of the original (unmodified) structure, SDM calculates a new set of mode shapes for the modified structure.

For example, a stiffener was added across the bottom of an aluminum panel. Adding the stiffener replaces the first mode of the structure (a bending mode at 73Hz) with a torsional mode at 94Hz. The torsional mode was the second mode of the unmodified structure but was not affected by the rib stiffener. Without the stiffener, machinery operating at 4000-4500 RPM would excite the first bending mode of this panel causing it to resonate. Adding the stiffener not only eliminated the first mode at 73Hz, but also removed another mode at 143Hz, thus removing a potential resonance problem at 2X RPM as well.

Additional Features:

VT-910 Visual OMA

Includes VT-550 Visual Modal Pro plus the VES-4700 Operating Modal Analysis option. 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.

VT-920 Visual Experimental FEA

Includes the VT-570 Visual Modal package plus the VES-8000 Finite Element Analysis Option.This package 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.

Additional Features:

VT-930 Visual Model Updating

Includes the VT-560 Visual SDM Pro package plus VES-9000 Finite Element Model Updating Options. This package 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).

VT-710 Visual Acoustics

VT-620 Plus VES-6000 Acoutics option. This package 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.

Additional Features:

VT-740 Visual Vibro-Acoustics & VT-750 Visual Vibro-Acoustics Pro

VT-740 Visual Vibro-Acoustics adds VES-6000 Acoustics to VT-570 Visual Modal. VT-750 Visual Vibro-Acoustics Pro adds VES-6000 Acoustics to VT-550 Visual Modal Pro. 

These packages provides you with the tools necessary to analyze both vibration and acoustic problems in structures or machinery and correlate surface vibrations with acoustic measurements. With acoustics, you can display and post-process Acoustic Intensity and Sound Pressure Level (SPL) data, calculate the P-I Index, and perform a variety of others tasks.

VT-950 Visual STN 2010

The package that does it all. Includes VT-620 package plus:

ME'scopeVES version 5.0 Brochure - MEscopeVES.pdf