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Modal Testing & Modal Analysis - SIMO, MIMO and ODS

Effective and affordable modal testing and analysis solution for SIMO, MIMO and ODS testing methods. The modal test is an indispensable tool to determine natural frequencies and mode shapes of any structure. With Dewesoft solution, you are able to excite the structure with an impact hammer or modal vibration shakers and easily measure the responses. Import or draw your geometry for rich visualization and animation of your structures.
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Multi-Input Multi-Output (MIMO) Calculation

MIMO measurement techniques are a well-proven and well-established method for collecting FRF data sets. They offer some distinct advantages for the measurement and extraction of basic modal parameters especially while testing larger structures.

The main advantage of MIMO is that the input-force energy is distributed over more locations on the structure. This provides a more uniform vibration response over the structure, especially in cases of large and complex structures and structures with heavy damping.

​Excitation in more locations often also provides a better representation of the excitation forces that the structure experiences during real-life operation.

Easy & Quick Setup

In the case of a high number of measured channels, adding and removing the excitation and response channels is a very simple process with autofill setup.

Autofill functionality is enabled for:
​
Autofill for uniaxial and triaxial sensors (response channels)
Start node index and index increment selection
Define the direction and sign of added channels
Group the sensors and define the number of groups​

Auto-generated Visualization Screens

For an easier start, Dewesoft software offers auto-generated displays for modal analysis. The predefined display already come with the most often used instruments and an arrangement that makes sense according to the modal testing.

One screen is generated for the acquisition and measurement process and the second screen is defined for the post-analysis of the measured data.

Of course, the flexibility of Dewesoft data acquisition software allows you to easily change and customize the default displays or define unlimited new ones.
Picture

Structure Geometry Animation & Projection

Inside Dewesoft DAQ software, you can quickly draw simple 3D structures as well as import more complex ones using UNV file format. The cartesian and cylindrical coordinate system is supported, which is great for drawing circular objects.

You can animate the structure at a single frequency in all three directions. During the measurement, the color of the points is changing, for easier identification of the excitation point and the response points.

The structure can be shown in different projections:
3D perspective / 3D orthographic / Several 2D projections
Picture

Merge Multiple Data Files Together

Dewesoft software makes it very easy to record one data file for each point or group in your subject under the modal test.

After the measurements are done, you can easily merge separate data files into one to analyze and animate the structure and observe the behavior.

Each transfer function contains information about response, node, response direction, reference node and reference direction.

Operating Deflection Shapes (ODS)

In ODS analysis, the structure is only excited by the machine, like in real operation, whenever it is not possible to vary the excitation frequency. ODS is the simplest way to see how a machine or structure moves during its operation at a specific frequency.

​Dewesoft software modal test module, one of the acceleration sensors has to be defined as excitation (this one is the reference, normalized to 1), and others as a response. Animation can be displayed as usual but only makes sense in areas with good coherence.

OMA - Operational Modal Analysis

​The operational modal analysis is used for large civil engineering structures, operating machinery, or other structures, making use of their output response only. These structures are always loaded by natural loads that cannot easily be controlled and measured, for instance wave load (offshore structures), the wind loads (buildings) or traffic loads (bridges).

Dewesoft can be used to perform all the necessary time-domain measurements which can be exported to various file formats in order to make calculations in external software (e.g. ME' scope)
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Exporting Data

After the measurement is done the data can be exported to a lot of different file formats, e.g. UNV/UFF, Diadem, Matlab, Excel, Text...The transfer function can be separately exported by Real. Imag, Ampl or Phase part.

The Universal File Format (also known as UFF or UNV format) is very common in modal analysis. Depending on the header, it can contain either transfer functions, coherence, geometry, ... or various other data. We modified the UNV/UFF export, especially for the modal test.
Picture

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  • Home
  • Products
    • DEWESoft Test & Measurement Instruments & Software
    • CAE Acoustic & Vibration
    • PCB Sensors & Instrumentation
    • Endevco Sensors for Challenging Test & Measurement Applications
    • IMI Industrial Vibration Sensors, Switches & Instrumentation
    • OMS Laser Vibrometer & Scanner
    • Resensys Remote Monitoring Sensors
    • Larson Davis Noise & Vibration Measurement
  • APPLICATIONS
    • DEWESOFT >
      • Acoustics >
        • Sound Level Meter
        • Octave Band Analysis
        • Sound Intensity
        • Sound Power
        • Reverberation Time RT60
      • Structural Dynamics >
        • FFT Analyzer
        • Fatigue Testing
        • Modal Testing
        • Shock Response Spectrum
        • Sine Reduction Test (COLA)
        • Bridge Monitoring
      • Monitoring >
        • Condition Monitoring
        • Condition Monitoring Software
      • Vibration Analysis >
        • FFT Analyzer
        • Human Body Vibration
        • Octave Analysis
        • Order Tracking Analysis
      • Vehicle Testing >
        • ADAS >
          • Collision Avoidance Testing
          • Blind Spot Detection Testing
          • Lane Departure Warning & Lane Assist System Testing
          • Adaptive Cruise Control Testing
          • Autonomous Vehicles Testing
        • Brake Testing >
          • Flexible Brake Testing System
          • Brake Testing Calculations
          • Automated Testing Workflow
          • Brake Test System Configuration Examples
          • Supported Automated Brake Testing Standards
          • Free Online Brake Test Training & Resources
        • Brake Noise Testing >
          • Brake Noise Detection
          • Brake Noise Input Channel Configuration
          • Brake Noise Analysis Results
        • Combustion Analysis >
          • In-car and Testbed Data Acquisition System
          • Internal Combustion Engine R & D
          • Simple & Intuitive Configuration
          • Heat Release Calculation
          • IC Engine Knocking Detection
          • Combustion Noise Measurement & Analysis
          • Additional Math Calculations & Statistics
          • Combustion Analysis Features
          • Raw Data Storage, Post Processing & Reporting Capabilities
          • Free Online Training Course
        • E-Mobility >
          • Electric Vehicle Testing
          • Hybrid Vehicle Testing
          • Hydrogen Vehicle Testing
          • Battery Testing
          • EV Charging Analysis
          • Testbed & On-road Testing
          • Synchronized Measurement of Several Vehicle Parameters
          • Exemplary E-Mobility
          • Analyzing Different Driving Situations
          • Charging Profile, Time & Efficiency
          • EMC Test
        • Harsh Environment Testing >
          • Vehicle Environmental Tests
          • Distributed Data Acquisition
          • Heating & Air Condition Testing
          • Climate Comfort Testing
        • Roadl Load Data / Durability >
          • Durability Testing Overview
          • Compact All-in-one DAQ System
          • Powerful DAQ Software
          • Digital Interface to 3rd Party Durability Test Benches
        • Vehicle Dynamics >
          • Vehicle Dynamics Test Suite
          • Vehicle Dynamics DAQ System Overview
          • Standard Vehicle Test Maneuvers
          • Data Processing
          • Vehicle Test Suite Applications
          • Easy Controls for Test Driver
      • Power & Energy >
        • Power Analyzer >
          • Motor & Inverter
          • Power Transformer
          • Standby Power
          • Electrical Equipment
        • Power Quality Analyzer >
          • Railway
          • Renewable Energy
          • Wind Power
    • CAE ACOUSTIC & VIBRATION >
      • First Handheld Sound Camera
      • Simplest Way to Image Sound Sources
      • Room / Building Acoustic
      • Compressed Air Leak Detection
      • SoundCam in Automotive Industry
      • Noise at Construction Site
      • Acoustic Applications
    • PCB PIEZOTRONICS >
      • General Test Labs & Universities
      • Aerospace & Defense
      • Automotive
    • ENDEVCO SENSORS >
      • Aerospace
      • Auto Safety
      • Automotive
      • Infrastructure
      • Laboratory
      • Transportation
      • Weapons
    • IMI INDUSTRIAL SENSORS >
      • Energy
      • PDM & Process Monitoring
    • OMS LASERPOINT & SCANNER >
      • Aerospace
      • Audio & Musical Instruments
      • Automotive
      • Electronics
      • Medical
      • Structural Integrity
  • VIBRATION TESTING & CALIBRATION SYSTEM
    • DEWESoft Vibration Shakers
    • PCB Portable Handheld Shaker
    • IMI Industrial Portable Handheld Shaker & Calibrator
    • ECON Vibration Testing System >
      • Miniature Shaker
      • Air Cooled Shaker
      • Water Cooled Shaker
      • Climate Chamber Combined Shaker
      • Hydraulic Shaker
      • Multi-Axis Shaker
      • Vibration Controller >
        • VT-6 Series Servo-vibration Controller
        • VT-8 Series MIMO Vibration Controller
        • VT-9 Series Vibration Controller
      • Power Amplifier >
        • VSA-L Series Linear PA
        • VSA-H Series Switching PA
      • Slip Table
      • Head Expander
    • Dewesoft & PCB Instrument Calibration Service >
      • DEWESoft
      • PCB Sensors & Instrumentation
  • INFORMATION
    • DOWNLOAD >
      • DEWESoft
      • CAE Acoustic & Vibration
      • PCB Piezotronics >
        • Accelerometers
        • Force Sensors
        • Impact Hammers
        • Microphones
        • Signal Conditioners
      • ENDEVCO Sensors
      • IMI Industrial Sensors
      • Resensys Wireless Sensors
      • OMS Laser Vibrometer
      • Calibration Instruments
    • VIDEOS >
      • DEWESoft
      • CAE Acoustic & Vibration
      • PCB Piezotronics >
        • PCB Piezotronics Virtual Tour
    • TRAINING >
      • Getting Started with DEWESOFT
      • How to Measure Signals
      • How to Analyze Data
      • Case Studies
    • WEBINARS
  • Contact