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-3600 Advanced Signal Processing

VES-3600 contains an FFT & Inverse FFT that make it easy to analyze signals and animate ODS’s directly from either time or frequency domain measurements. It includes Notch, Band & Exponential windowing so that selected ranges of data can be analyzed, and unwanted portions removed. It includes waveform Cut, Copy & Paste, waveform integration & differentiation, and a large variety of waveform math and statistics functions.

This option also can be used to calculate Fourier spectra, Auto & Cross spectra, Power Spectral Densities (PSDs), and Spectrograms from time waveforms, using time domain windowing, triggering, averaging and overlap processing.

ODS FRFs, which provide a true measure of the amplitude & phase of each measured structural response, can also be calculated. A set of ODS FRFs can be used for displaying ODS’s in animation and for Operational Modal Analysis.

**Signal Processing** **Features**:

**Simultaneous FFT**& Inverse FFT 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 & Exponential**windows to remove noise and leakage from impulse response measurements**Flat Top**window for obtaining accurate narrow band signal amplitudes**Hanning**window for minimizing leakage effects in frequency spectra- Calculation of
**Fourier spectra, Auto & Cross spectra, Spectrograms, Power Spectral Densities (PSDs)**, and**ODS FRFs**from time domain operating data - Time domain signal processing includes,
**Rectangular**,**Hanning**, or**Flat Top**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**Waveform Math**functions include complex scaling, add, subtract, multiply, divide, conjugate, invert, square, square root, smooth, sum, average, and more on measurement Traces in a Data Block**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 Processing Features:**

- Shape
**Integration & differentiation** - Shape
**Cut, Copy & Paste** **Sort & Select**of shapes and shape components (DOFs)**Shape Product**. Shows nodal lines among all shapes when displayed on the structure model

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.

**Acoustics** **Features**:

- 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

The VES-3600 option 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

**Modeling & Simulation Features:**

**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**Sinusoidal ODS**. Calculates and displays and ODS caused by multiple sinusoidal excitation forces (Inputs), using either FRFs or mode shapes to model the system dynamics**Force Path Analysis**. Calculates multiple excitation force (Input) time or frequency waveforms from multiple responses (Outputs), using either FRFs or mode shapes to model the system dynamics**MIMO****FRFs (Transfer functions)**. These frequency functions are calculated from simultaneously acquired multiple excitation forces (Input) time waveforms, and the multiple response (Output) time waveforms caused by the Inputs. Rectangular or Hanning windowing, triggering, linear or peak hold spectrum averaging, and overlap processing can be chosen during signal processing**Multiple & 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), at each frequency. Partial Coherence measures the contribution of each measured excitation force (Input) to each measured response (Output), at each frequency.**MIMO****FRFs (Transfer functions)**can also be calculated from multi-channel Auto & Cross spectrum measurements

## VES-4000 Basic Modal Analysis

The **Basic Modal Analysis** option provides all of the tools you need for extracting modal parameters from experimental vibration measurements (FRFs). With this option you can identify the ** frequency, damping & mode shape** of the modes of a structure from experimental data.

Modal parameter estimation (curve fitting) is done in three steps; 1) count the number of modes using a Mode Indicator function, 2) estimate the modal frequency & damping for each mode, 3) estimate a modal residue (a mode shape component) for each mode & each measurement.

**Basic Modal Analysis Features:**

**Mode Indicators**for counting modes. Either a Complex Mode Indicator Function (**CMIF**) or a Multivariate Mode Indicator Function (**MMIF**) can be calculated and displayed. All of the resonance peaks above a scrollable noise threshold are automatically counted**Frequency & damping**curve fitting. Either the**Local**or the**Global Orthogonal Polynomial**method can be used, with extra polynomial terms to compensate for out-of-band modes**Residue**curve fitting. Either the**Orthogonal Polynomial**method or the**Peak Cursor**method can be used**Quick Fit.**With one command,are executed with minimal user interaction*all three curve fitting steps***Frequency & damping estimates**areon the Mode Indicator graph*graphically indicated*- A
**Curve Fit function**ison each measurement to graphically confirm each curve fit*overlaid* measurements and*Selected*can be used to improve your modal parameter estimates*frequency bands*is saved with each measurement*All curve fitting data*- FRFs can be synthesized using the parameters of
modes*selected* **Modal Assurance Criterion (MAC)**. A 3D bar chart or spreadsheet display of the MAC values between all mode shape pairs. If MAC = 1, two shapes are the same. If MAC < 0.9 two shapes are different.**Shape Difference Indicator (SDI)**. A 3D bar chart or spreadsheet display of the SDI values between all mode shape pairs. If SDI = 1, two shapes have the same values. If SDI < 0.9 two shapes have different values**Modal Participation**. A 3D bar chart or spreadsheet display of the Real part, Imaginary part, and Magnitude of the modal participation factors that result when a set of shapes is curve fit to another set of shapes.- Mode shapes can be re-scaled between
**Residue****mode shapes**and**UMM mode shapes** - Modal parameters can be imported & exported using the
**Universal File Format**(**UFF**) - Mode shapes can be imported from many third party disk files, including Ansys, Emerson Process Management (CSI), FEMAP, LMS, I-DEAS, NASTRAN, Ono Sokki, Rockwell Automation Emonitor, Spectral Dynamics Star

## VES-4600 Advanced Modal Analysis

The **Advanced Modal Analysis **option includes advanced Multiple Reference curve fitting methods for extracting the modal parameters of ** closely coupled modes or repeated roots** from multiple reference FRF data. This option also includes

**Stability**diagram methods for finding modes in data where two or more modes are represented by a single resonance peak on a Mode Indicator curve.

**Multi-Reference Modal Analysis Features:**

- Mode counting to identify
using either a Multi-Reference Complex Mode Indicator Function (*closely coupled modes & repeated roots***Multi-Ref CMIF**), or a Multi-Reference Multivariate Mode Indicator Function (**Multi-Ref MMIF**) - Curve fitting using the
**Multi-Ref Orthogonal Polynomial**method **Multi-Ref Quick Fit**. Automatically executes three curve fitting steps (count modes, estimate frequency & damping for each mode, estimate residues for each mode) with minimal user interaction- Multi-Reference curve fitting using either the
**Z-Polynomial**, the**Complex Exponential**, or the**Alias-Free Polynomial (AF Poly)**curve fitting method to estimate stable groups of modal frequency & damping (stable pole groups). All poles are displayed on a Stability diagram. **Stability****diagram**. A graphical display of frequency & damping estimates (poles) in differently colored stable pole groups. All poles are calculated using curve fitting model sizes ranging from*1 to a user-defined maximum model size***Stable Poles****diagram**. A graphical display of poles (frequency & damping estimates) in differently colored stable pole groups**Stable Poles Group**. A group of poles on a Stability or Poles diagram that satisfy a user-definedthat lie within user-defined*minimum number of poles**frequency & damping tolerances*- Shape
**Complexity Plot**. A graphical display of the complex shape components of one or more mode shapes - Shape
**Magnitude Ranking**. A graphical display of the ordered magnitudes of the shape components of each mode shape **Shape Expansion**. A set of shapes with many DOFs isto one or more shapes with few DOFs, to create one or more new shapes with many DOFs in them*curve fit*

The VES-4600 option also includes **Operational Modal Analysis** tools. For cases where the excitation forces cannot be measured and output-only responses are acquired, modal parameters can still be extracted from a set of specially processed Cross Spectra or ODS FRFs, thus providing a complete set of tools for extracting modal parameters from measurements made in any type of testing environment.

Modal parameter estimation (curve fitting) is done in three steps; 1) count the number of modes using a Mode Indicator function, 2) estimate the modal frequency & damping for each mode, 3) estimate a modal residue (a mode shape component) for each mode & each measurement.

**Operational Modal Analysis Features:**

**Deconvolution window**. When this window is applied to a set of Cross Spectra or ODS FRFs, operational modal parameters can be extracted from them using FRF-based curve fitting methods**Modal Model from OMA modes**. A modal model (a scaled set of mode shapes) can be created from a set of output-only operational mode shapes**Mode Indicators**for counting modes. Either a Complex Mode Indicator Function (**CMIF**) or a Multivariate Mode Indicator Function (**MMIF**) can be calculated and displayed. All of the resonance peaks above a scrollable noise threshold are automatically counted**Frequency & damping**curve fitting. Either the**Local**or the**Global Orthogonal Polynomial**method can be used, with extra polynomial terms to compensate for out-of-band modes**Residue**curve fitting. Either the**Orthogonal Polynomial**method or the**Peak Cursor**method can be used**Quick Fit.**With one command,are executed with minimal user interaction*all three curve fitting steps***Frequency & damping estimates**areon the Mode Indicator graph*graphically indicated*- A
**Curve Fit function**ison each measurement to graphically confirm each curve fit*overlaid* measurements and*Selected*can be used to improve your modal parameter estimates*frequency bands*is saved with each measurement*All curve fitting data*- FRFs can be synthesized using the parameters of
modes*selected* **Modal Assurance Criterion (MAC)**. A 3D bar chart or spreadsheet display of the MAC values between all mode shape pairs. If MAC = 1, two shapes are the same. If MAC < 0.9 two shapes are different.**Shape Difference Indicator (SDI)**. A 3D bar chart or spreadsheet display of the SDI values between all mode shape pairs. If SDI = 1, two shapes have the same values. If SDI < 0.9 two shapes have different values**Modal Participation**. A 3D bar chart or spreadsheet display of the Real part, Imaginary part, and Magnitude of the modal participation factors that result when a set of shapes is curve fit to another set of shapes.- Mode shapes can be re-scaled between
**Residue****mode shapes**and**UMM mode shapes** - Modal parameters can be imported & exported using the
**Universal File Format**(**UFF**)

## VES-5000 SDM (Structural Dynamics Modification)

Once you have identified and quantified a resonance problem in a machine or structure, the next question is, *“How can the structure be modified to fix the problem?”*

The **SDM (Structural Dynamics Modification) **method allows you to examine the effects of a variety of potential structural modifications on the resonances of a structure without actually having to make physical modifications.

The resonances (modes of vibration) of a machine or structure depend on its physical properties (geometry, density, elasticity, boundary conditions, etc.). Changing the physical properties of a structure by adding modifications such as stiffeners, brackets, tuned absorbers or other modifications, will directly affect its modes. The **SDM** method uses industry standard finite elements such as springs, masses, dampers, bars, plates, and solids to model structural modifications. These modifications, together with the modes of the original (unmodified) structure, are used to calculate the new modes of the modified structure.

Because SDM solves an eigenvalue problem in modal space, it calculates new solutions much faster than an FEA Eigen solution method, which solves for modes in physical space. Hence, thousands of SDM solutions can be evaluated in minutes, which is impossible with an FEA method.

**Structural Dynamics Modification Features:**

- Model real world modifications to the structure by adding
of FEA elements to a 3D model of the structure*any number* - All
on the structure model are used by SDM. All hidden elements are ignored*visible FEA elements* - Either
*experimental***(EMA)**or*analytical***(FEA)**modes can be used to model the dynamics of the structure. - Modifications are modeled using the
; Point*following FEA elements***masses**, linear**springs**, linear**dampers**,**rods**,**beams**, triangular and quadrilateral**plates**, tetrahedrons, prisms, and brick**solid elements** - All FEA
are displayed and edited in property spreadsheets*element properties* **Modal Sensitivity Analysis**. Define a solution space of FEA properties, and calculate new modes that minimize differences between target modal parameters and the new modal parameters**Sub-structuring**. Connect togetherusing FEA elements, and calculate the modes of the overall combined substructures*two or more substructures***Tuned absorbers**. Model the addition ofto a structure, and calculate the new modes of the structure with the tuned absorbers attached*multiple mass-spring-damper vibration absorbers*

## VES-8000 Finite Element Analysis (FEA) & FEA Model Updating

With the **FEA Model Updating** option you can create an FEA model by adding FEA elements to the same 3D model that is used to display ODS’s and mode shapes in animation.

The ** normal** or

**FEA modes of the structure can be calculated from the FEA model. This option includes a library of FEA elements, including springs, masses, dampers, rods, bars, plates, and three types of solid elements. It also includes the**

*complex***FEA Assistant**for quickly populating any structure model with FEA elements.

**FEA Model Updating Features:**

**FEA Materials**Contains material properties (elasticity, Poisson’s ratio, density)**FEA Properties**Contains properties that can be assigned to FEA elements**FEA Assistant**. Populates a geometric model with FEA elements.- Calculates
**Normal Modes**for models with no damping - Calculates
**Complex Modes**for models with damping - Calculates
**Stress & Strain**for an FEA model deformed with ODS data. **Point matching**between FEA and EMA models**FEA Model Updating**. Define a solution space of FEA properties, and calculate new FEA mode shapes which minimize differences with EMA modal parameters**Imports & exports FEA models**in a variety of popular third party disk file formats

## VES-700 Multi-Channel Acquisition & Multi-Shaker Signal Output

This option adds multi-channel data acquisition to any ME’scope package. It provides setup and control of third party multi-channel acquisition hardware from within ME’scope and supports non-triggered data acquisition.

This option also includes **Impact testing**, if it is supported by the front end hardware. Time waveforms are simultaneously acquired with the front end hardware, and post-processed by one of these options. All acquisition and post-processing is set up in a special Acquisition window.

Post-processing includes calculation of Auto & Cross spectra, FRFs & Coherence, ODS FRFs, MIMO (multi-input multi-output) FRFs with Multiple & Partial Coherence, Auto & Cross correlations, Impulse responses.

**Acquisition Features**:

**Block-based data acquisition**.**Number of Samples**and**Sampling Rate**are user-specified but hardware dependent**Frequency domain functions**. Fourier spectra, Auto & Cross spectra, FRF (Transfer function), Coherence, ODS FRF**Time domain functions**. Auto & Cross correlation, Impulse response**DC removal**. Frequency domain removal**Spectrum averaging**. Stable or peak hold with overlap processing**Triggering**. Trigger level, double hit line, pre-trigger delay, accept/reject**Channels spreadsheet**. Acquisition channel properties include transducer sensitivity, transducer units, DOFs, AC/DC coupling, transducer power, time domain window, and more

**Multi-Shaker Signal Output**

Multi-Shaker Signal Output requires front end hardware that outputs signals to a shaker. It can output up to six (6) random or chirp signals for performing a multi-shaker modal test. Multi-shaker excitation is very effective for testing non-linear structures, and structures that cannot be excited sufficiently with one exciter. MIMO FRF plus Multiple & Partial Coherence functions are calculated by the VES-7XX option that is compatible with this option.

**Multi-Shaker Signal Output** **Features**:

- Outputs 1 to 6
**block-based random or chirp**(fast sine sweep) signals **Starting & ending frequency**of the signals is user-specified**Number of samples**and**sampling rate**are user-specified in the VES-7XX option**Burst random & burst chirp**. User-specified signal shutoff as percentage of block (10 to 100 %)- Output signals synchronized with block-based acquisition by the VES-7XX option
- Output signals time delayed to make them uncorrelated.
- MIMO FRF plus Multiple & Partial Coherence function calculation done by the VES-7XX option compatible with multi-shaker excitation.