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Frequency Response Function (FRF) Measurements

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FRF Measurement Software by SINUS Messtechnik GmbH

Multi-Channel Data Acquisition System + SAMURAI Software + Option: Transfer FRF

Structural Dynamics Software

All data acquisition systems by SINUS Messtechnik GmbH can be used with an impact hammer and one or more accelerometers to measure the transfer function (FRF) of structures, machines or other objects.

In acoustic and other oscillatory processes, relations between signals of different origins are often of interest (e.g. coherence of two signals, relationship between excitation and response of a structure).

The frequency-dependent transfer function (or Frequency Response Function, FRF), and related values are all calculated from the FFTs of the signals.

This option is applied when measures are being taken for vibration damping or noise reduction by a targeted influencing of the vibration transfer.

The software option includes two analysis alternatives: the investigation of two quasi-stationary signals, or the analysis of structures via impulse excitation (using accelerometers and an impulse hammer). For impulse excitation, the software supports the organization of the measurement points on a linear or planar grid. The visualization of the oscillation modes is not included in this software option but the measurement data can be imported into the ME’scope software where visualization can be provided..

FRF Software Option features

  • Bandwidth, number of lines, windowing and averaging mode selectable
  • Configurable exponential window for force excitation
  • Simultaneous calculation of the transfer values between arbitrarily selectable pairs of channels (e.g. Ch2 versus Ch1, Ch3 versus Ch1, Ch3 versus Ch2)
  • Values calculated include: autospectrum reference/response, coherence and Coherent Output Power, transfer functions (H1, H2, 1/H1 and 1/H2), cross-correlation and cross-spectrum, impulse response, autocorrelation reference/response, Cepstrum reference/response
  • Display of complex values as either Amplitude / Phase / Nyquist or Real / Imaginary / Nyquist
  • Operator guidance via an intuitive graphical user interface for the whole measurement process
  • Instructions and overload notification via speech output
  • Export to ME’scope via UFF, Excel, or NWWin
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