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The designer who wants to predict or study the vibrations of a structure needs to know its dynamic characteristics. Determining these characteristics consists of locating and analysing the vibration modes of the structure.

Nearly all the modes are coupled, but by using an optimum combination of multiple excitation forces, P-Sys-Modal® allows you to dissociate them, using the "unique" appropriation method. Then the analysis consists of the isolation of each mode, in the recording of its own forms and in the automatic calculation of the generalised coefficients of mass, stiffness and damping.

Rich with 40 years of experience, P-Sys-Modal® system and P-Win-Modal® software represent the latest state of the art of PRODERA modal analysis systems.

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P-SYS-MODAL® , located in a compact 7 U rack, allows the force control of 16 or 32 channels of excitation as well as the acquisition of 256 channels of measurement up to a maximum of 1024 channels. P-SYS-MODAL® is supplied in a rack with casters to make easy both the transportation and the installation.


  • Power supply : 220 V ± 10 % 50 Hz
    or 115 V ± 10 % 60 Hz
  • Weight: 15 kg.
  • Dimensions of the rack:
    standard 19", 7 U, width: 480 mm


excitation.jpg (21624 octets) The appropriation method is based on the capacity to generate very stable pulse and sine excitations. With a frequency stability of 10-8 Hz, P-Sys-Modal® is perfectly adapted to do that.

Appropriation is not resumed in generating an excitation signal. P-Sys-Modal® generates up to 32 in phase or out of phase different signals.

  • Module "Appropriation"

16 channels (32 channels max.)

    • Output voltage : ± 5 V peak on 2 000 points

Phase : 0 or p


  • Module "Generator"
  • Frequency range :
    0 - 2 000 Hz
  • Stability :
    frequency : 10-8
    amplitude : 5.10-3
  • Signals :
    sine, random and impulse

Acquisition is the second part of P-Sys-Modal® system.
From 32 to 256 channels in the basic configuration (upgrade possible up to
1024 channels) P-Sys-Modal® will
cover all your requests.
Harmonic tests are based on the analysis of the real and imaginary parts of the acquired results. A specially developed digital board calculates in real time these two magnitudes, reducing computation time and increasing the accuracy of the results.
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  • Module "Acquisition"

32 channels (256 channels per rack, 1024 channels max.)
Input sensitivity : 5 V max.

  • Module "Digital multiplier"
  • Real part of the transducer signal: 0 - 5 V peak
  • Imaginary part of the transducer signal: 0 - 5 V peak

Real time mode shape visualisation


P-Sys-Modal® is controlled by a PC Pentium and P-Win-Modal® modal software.

A manual keyboard is available for a user-friendly operation.

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  • Random excitation
  • Multi-lissajous visualisation.


P-WIN-MODAL software - GVT on L-159 Trainer Aircraft (VZLU)




16 Channels multipoint PRODERA excitation and data acquisition system using P-WIN-MODAL® software.



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If P-Sys-Modal® represents the latest evolution in modal excitation and acquisition equipment, P-Win-Modal® represents its logical control and analysis software.

As a result of the requirements from PRODERA's customers, P-Win-Modal® allows an easy set-up of the test, as well as the quick and simple calculation of the different modal parameters.

By using the file "hardware inventory" of available exciters and transducers, no possible errors are made by defining the sensitivities.

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Data is organised following the structure under test.
As several geometries are available for each structure (introduced from a digitiser table), it is easy to change structure configuration without changing the complete test set-up.


Multi-point impulse test quickly gives a first approximation of the structure's behaviour and optimum excitation conditions.

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By using the appropriation method, the harmonic excitation allows effective isolation of the vibration modes. By using the Complex power and/or Quadrature methods the modal parameters are obtained.
Using P-Sys-Modal® digital multiplier board allows real-time visualisation of the structure's mode shape.


Calculated results:
  • Stabilisation time of structure
  • Identification of resonance frequencies
  • Generalised mass, stiffness and damping
  • Temporary responses
  • FRF acquisition
  • Direct link to DynaWorksâ
  • Direct link to Structural Dynamics Toolbox
  • UFF import/export functions (blocks 15, 55, 58, 82)
  • FemTools


dynaworks.gif (1681 octets) DynaWorks® software package for measurement, test, data management and analysis is used by P-Win-Modal® as an integrated data management utility.


P-Win-Modal® is integrated to a large modal analysis environment with other software packages in order to create a complete and competitive environment:

  • P-Win-Modal® : Modal analysis software
  • P-Flight-Modal® : Flutter prediction software
  • FEMTools® : Data analysis software (DDS – Belgium)
  • SDT Toolbox® : Modal analysis using Matlab®
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