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Do you need to do classical modal analysis with an impact hammer or shakers?

All versions of ARTeMIS Modal support classical modal analysis also known as Experimental Modal Analysis1.

FRF’s can be uploaded using Universal File Format (UFF/UNV), or be internal estimated by uploading input and output time domain measurements in the Manage Measurement Task, or by using the Impact Testing Module2.

  • Multiple Input Multiple Output Modal Technology
    All methods for Experimental Modal Analysis in ARTeMIS Modal are born multiple input multiple output polyreference methods. This means that the techniques are capable of estimating closely space modes and even repeated modes with a high degree of accuracy. Below there is an example of a perfectly symmetric structure where the polyreference methods have been applied on a setup with two reference accelerometers and a rowing impact hammer.
  • All-in-one Solution for Selected Data Acquisition Hardware
    ARTeMIS Modal supports direct control of selected data acquisition hardware. If a data acquisition plugin is available along with the EMA plugin, then it is possible to perform a complete impact testing using ARTeMIS Modal. Below it is also shown how the above example has been created using impact testing.
  • Easy Import of Frequency Response Functions from Third Party Providers
    ARTeMIS Modal is designed to work with geometry information and Frequency Response Functions obtained from third party providers. Through the Universal File Format standard all can be uploaded from a single or multiple files. See the example below showing how a modal test of an Audi TT is imported from a third party provider in this way.

Two polyreference methods are available; CMIF Peak Picking and RFP-Z polynomial estimation.

Do you need to do classical modal analysis with an impact hammer or shakers?

All versions of ARTeMIS Modal support classical modal analysis also known as Experimental Modal Analysis1.

FRF’s can be uploaded using Universal File Format (UFF/UNV), or be internal estimated by uploading input and output time domain measurements in the Manage Measurement Task, or by using the Impact Testing Module2.

 

  • Multiple Input Multiple Output Modal Technology 

    All methods for Experimental Modal Analysis in ARTeMIS Modal are born multiple input multiple output polyreference methods. This means that the techniques are capable of estimating closely space modes and even repeated modes with a high degree of accuracy. Below there is an example of a perfectly symmetric structure where the polyreference methods have been applied on a setup with two reference accelerometers and a rowing impact hammer.

  • All-in-one Solution for Selected Data Acquisition HardwareARTeMIS Modal supports direct control of selected data acquisition hardware. If a data acquisition plugin is available along with the EMA plugin, then it is possible to perform a complete impact testing using ARTeMIS Modal. Below it is also shown how the above example has been created using impact testing.
  • Easy Import of Frequency Response Functions from Third Party ProvidersARTeMIS Modal is designed to work with geometry information and Frequency Response Functions obtained from third party providers. Through the Universal File Format standard all can be uploaded from a single or multiple files. See the example below showing how a modal test of an Audi TT is imported from a third party provider in this way.

Two polyreference methods are available; CMIF Peak Picking and RFP-Z polynomial estimation.

Complex Mode Indicator Function (CMIF) – Peak Picking

Benefits

 

  • Intuitive modal parameter estimation based on peak-picking in frequency domain.
  • Immediate results even in case of hundreds of measurement points and modes.
  • Extremely robust being based on the Singular Value Decomposition of the matrices of the Frequency Response Functions.
  • Handles single- or multiple test setups and single- or polyreference in exact same way.

 

Experimental Modal Analysis

 

Rational Fraction Polynomial in Z domain (RFP-Z)

Benefits

  • Estimates global modes from stabilization diagram of modes extracted from rational polynomials.
  • Estimates natural frequencies, damping ratios and mode shapes using Automatic Mode Estimation.
  • Cursors used to select the frequency range to use in the polynomial estimation.
  • Optional correction of damping estimates in case exponential windows are used during internal impact testing.2
  • Handles single- or multiple test setups and single- or polyreference in exact same way.

 

Experimental Modal Analysis