Description
Visual SDM Pro™ Features
Structural Dynamics Modification
- Interactive graphical addition of structural modification elements to a structure model
- All visible FEA elements on a structure model are used by SDM. All hidden elements are ignored
- Modifications can be modeled using the following FEA elements; Point masses, linear springs and linear dampers, rod and beam elements, triangular and quadrilateral plate elements, tetrahedrons, prisms, and brick solid elements
- All FEA element properties are displayed and edited in property spreadsheets
- Modal Sensitivity Analysis: Define a solution space of FEA properties, and calculate new modes that minimize differences with target modal properties
- Sub-Structuring: Two or more substructures can be connected together with FEA elements, and the modes of the combined substructures calculated
- Tuned Absorbers: Multiple mass-spring-damper vibration absorbers can be attached to a structure model, and the new modes of the structure calculated
Modal Analysis
- Mode Indicators: Either a Complex Mode Indicator Function (CMIF), Multivariate Mode Indicator Function (MMIF) or a Modal Peaks Function (MPF) can be used to count resonance peaks above a scrollable noise threshold
- Frequency & Damping Curve Fitting: Either the Local or the Global MDOF Orthogonal Polynomial method can be used, with extra polynomial terms to compensate for out-of-band modes
- Residue Curve Fitting: Either the MDOF Orthogonal Polynomial method or the SDOF Peak cursor method can be used
- Quick Fit: Automatically executes all three curve fitting steps with minimal user interaction
- Frequency & damping estimates are graphically indicated on the Mode Indicator graph
- A curve fit function is synthesized and overlaid on each measurement to graphically confirm each curve fit
- Selected measurements and frequency bands can be used to improve modal parameter estimates
- All modal parameter estimates and curve fitting functions are saved with each measurement
- FRFs can be synthesized using modal parameters
- Modal Assurance Criterion (MAC): A bar graph and spreadsheet 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 bar graph and spreadsheet 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: Displays 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 and UMM mode shapes
- Modal parameters can be imported & exported using the Universal File Format (UFF)
- Mode shapes can be imported from Ansys, Emerson Process Management (CSI), FEMAP, LMS, I-DEAS, NASTRAN, Ono Sokki, Rockwell Automation Emonitor, Spectral Dynamics Star disk files
Multi-Reference Modal Analysis
- Multi-Reference Mode Indicators: Mode counting to identify closely coupled modes & repeated roots using either a Multi-Reference Complex Mode Indicator Function (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
- Stability Diagram 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-defined minimum number of poles that lie within user-defined 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 is curve fit to one or more shapes with few DOFs, to create one or more new shapes with many DOFs in them
- Measurement Decomposition: Decompose time or frequency waveforms into resonance curves using mode shapes
- Measurement Expansion: Expand experimental data into more DOFs using mode shapes
Operational Modal Analysis
- 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: Either a Complex Mode Indicator Function (CMIF), Multivariate Mode Indicator Function (MMIF) or a Modal Peaks Function (MPF) can be used to count resonance peaks above a scrollable noise threshold
- Frequency & Damping Curve Fitting: Either the Local or the Global MDOF Orthogonal Polynomial method can be used, with extra polynomial terms to compensate for out-of-band modes
- Residue Curve Fitting: Either the MDOF Orthogonal Polynomial method or the SDOF Peak cursor method can be used
- Quick Fit: Automatically executes all three curve fitting steps with minimal user interaction
- Frequency & damping estimates are graphically indicated on the Mode Indicator graph
- A curve fit function is synthesized and overlaid on each measurement to graphically confirm each curve fit
- Selected measurements and frequency bands can be used to improve modal parameter estimates
- All modal parameter estimates and curve fitting functions are saved with each measurement
- FRFs can be synthesized using modal parameters
- Modal Assurance Criterion (MAC): A bar graph and spreadsheet 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 bar graph and spreadsheet 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: Displays 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 and UMM mode shapes
- Modal parameters can be imported & exported using the Universal File Format (UFF)
- Mode shapes can be imported from Ansys, Emerson Process Management (CSI), FEMAP, LMS, I-DEAS, NASTRAN, Ono Sokki, Rockwell Automation Emonitor, Spectral Dynamics Star disk files
Interactive 3D Structure Model
- Create 3D structure model for displaying ODS’s and mode shapes in animation using Points, Lines, Surface Triangles, and Surface Quads
- No limits on the model size
- Each Point on the 3D model has its own local measurement axes (in Rectangular, Cylindrical, Spherical or Machine coordinates). Measurement axes are graphically oriented at each Point to match the sensor measurement directions
- The animated display of all un-measured Points & directions is interpolated from the animated motion of nearby measured Points & directions
- Light sources are used to make solid models look more realistic
- Photo realistic models (3D models made from digital photographs) provide more realistic animations
- Transparent surfaces allow better clarity of the motion of hidden portions of the structure
- 2D Structure model outlines can be traced from digital photographs or drawings.
- 2D models can be extruded or revolved to create 3D models
- On screen sizing, shaping, positioning and rotation of all drawing objects
- Create Substructures of selected Points, Lines and Surfaces to break complex models into components with simpler geometries. Substructures can also be moved, hidden, and made transparent for better clarity
- Drawing Assistant. Rapidly build 3D models using a library of editable and user-built Substructures
- The 3D model can be displayed in Quad View (X, Y & Z and user interactive 3D View), or in a single View
- Zoom, Pan, Rotate, and change the Perspective distance from the model
- Cut, Copy and Paste drawing objects
- Copy and paste properties in the drawing objects spreadsheet
- The speed of rotational Substructures is synchronized with the speed of order-tracked ODS’s
- Imports Structure models from over 14 different third party disk files
Time and Frequency Domain Measurements
- Data imported from most popular single or multi-channel analyzers, recorders, data acquisition systems and portable data collectors
- All popular types of time and frequency domain measurements can be imported
- No limits on the number of measurements or the number of samples per measurement
- Measurements can be displayed in Real, Imaginary, Magnitude (Linear, Log, dB), Phase, CoQuad (Real & Imaginary), Bode (Magnitude & Phase), Nyquist (Real vs Imaginary) and Orbit Plots
- Measurements can be displayed in Peak, Peak-to-Peak and RMS format
- Order cursors and cursors display in Displacement, Velocity or Acceleration units
- Measurements can be displayed in Row/Column, Strip Chart, Waterfall, Overlaid or Overlaid by DOF, and Color Map formats
- The measurement display can be Zoomed & Scrolling
- Line, Peak and Band Cursors can be displayed on each measurement
- All graphics can be copied to the Clipboard either as a Bitmap or Metafile
- All spreadsheet properties can be copied and pasted using the Windows Clipboard
- Imports Peak & Phase data for animation of order-based ODS’s
- Imports measurement data from over 40 different third party disk files
Animated Display of ODS’s & Mode Shapes
- Interactive sweep, dwell, or static display of ODS’s directly from time or frequency measurements, using the Line, Peak or Band Cursor
- Interactive sweep, dwell, or static display of mode shapes or ODS’s from a shape table
- Shape Interpolation. Geometrically weighted calculation of shape values for unmeasured DOFs using data from nearby measured DOFs
- Comparison display of ODS’s and mode shapes from two Data Blocks or Shape Tables in Side-by-Side or Overlaid format
- Animated shape display using Deformation, Arrows, Text values, or surface Contour Colors with Node Lines
- Animation with persistence for displaying orbit data at each Point.
- Hidden line and transparent surface display for greater clarity
- Video Recordings can be created during shape animation. Recorded animations can be imbedded in MS Power Point presentations.
- ODS’s and mode shapes can be imported from over 10 different third party disk files
Advanced Signal Processing
- 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 based on a variety of criteria
- 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 Processing
- 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
Acoustics
- 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
MIMO Modeling & Simulation
- 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
VES-700 Multi-Channel Acquisition
- Acquires multi-channel time waveforms directly from supported front end hardware
- Supports Impact, Output-Only, and Multi-Shaker testing: Post-processing includes Auto & Cross spectra,
Auto & Cross Correlation, Multi-Reference FRFs, Ordinary, Multiple & Partial Coherence,
ODS-FRFs, TRN Chain measurement & seeding - Pre-recorded data: Post-processes pre-recorded time waveforms from a Data Block
- Graphical Display: Each test point & direction displayed on a 3D model of the test article
- Shaker testing: Outputs 1 to 6 burst random or burst chirp signals through compatible DAC hardware
Multiple signals are uncorrelated
Scripts with Hot Keys
- Scripts make it easier to execute repetitive tasks, and to execute a sequence of commands for demonstration purposes.
- A script is a spreadsheet of MEscope window names and commands. Each line of a macro-program contains an MEscope data file window and a command to be executed in that window
- When a script is executed, all commands in the script are executed in sequence from top to bottom
- Hot Keys. Any script can be executed by pressing its Hotkey on the MEscope menu bar