ApplicationsDynamic Signal Analysis › Structural Analysis

Structural Analysis

Structural analysis applications



Main features


  • Frequency response function (FRF)
  • Coherence
  • Excitation and response spectra, windowing
  • Double hit detection
  • Reject hits
  • Averaging of hits
  • SISO, MISO, SIMO, Response group alignment
  • Mode indicator function (MIF)
  • Circle-fit method for extracting modal
  • parameters (to check with simulation)


MODAL ANALYSIS, IMPACT TEST

Modal analysis, impact test

DEWESoft provides an efficient solution, time for setup and measurement is very short. The structure can be imported or drawn in the geometry editor, hereby the points are defined. For measurement move the modal hammer or the response accelerometers, whatever you prefer. In analyse mode click on the resonant frequencies and check the animated shape.

MODAL ANALYSIS, SWEEP SINE

Orbit graph

For a running FRF the structure is usually excited with a shaker. For bigger structures DEWESoft supports the generation of multiple shaker signals (amplitude, phase, waveform and frequency). Shaker control have to be done externally.

DEWESoft® offers an integrated function generator (OPT-FGEN), which is fully software controlled. Various time patterns like fixed, sweep, step sweep, burst, chirp, noise and arbitrary table are configurable. Alternatively the FRF also works when the shaker is remotely controlled.

LARGE STRUCTURES, HIGH CHANNEL COUNT

High channel count

For a running FRF the structure is usually excited with a shaker. For bigger structures DEWESoft® supports the generation of multiple shaker signals (amplitude, phase, waveform and frequency). Shaker control have to be done externally.

DEWESoft® offers an integrated function generator, which is fully software controlled. Various time patterns like fixed, sweep, step sweep, burst, chirp, noise and arbitrary table are configurable. Alternatively the FRF also works when the shaker is remotely controlled.

OPERATING DEFLECTION SHAPES (ODS)

Orbit graph

The spectral ODS measurement is useful wherever it‘s not possible to measure the excitation source, and the structure is excited by the machine and it‘s operation state(s).

SHOCK AND DROP TESTS (SRS)

Shock and drop test

The Shock response spectrum (SRS) shows the maximum responses of a series of uniformly damped single degree-of-freedom (SDOF) systems caused by a shock waveform applied on the structure. After setting damping, resolution (1/3, 1/6, 1/12, 1/24, 1/48 octave) and primary section, the spectra are calculated out of the time domain signals. After the time domain signals are recorded, the data is analysed by the DEWESoft® SRS plugin. The simple user interface offers a convenient straight forward procedure for fast results.

BUMP TEST

Bump test

This is a quick test done to determine the resonance (natural) frequencies of a structure. No modal hammer is need- ed, only one accelerometer, just knock on the structure. Of course the impact tip influences the usable frequency range, but for a quantification measurement this is fine.

With the FFT Analyser the FFT spectra over a certain time window (impact +/- pre/post time) can be averaged.

SHORT-TIME FFT

Short-time FFT

High frequency bursts are almost impossible to accurately analyse by standard FFT, because the calculation takes too long (during calculation the signal is quickly changing). For this reason DEWESoft® mathematics offers the STFT - short term Fourier transform, which can have smaller blocks but still the same resolution as standard FFT. Therefore it’s much faster.

FINITE ELEMENT ANALYSIS

ME-scope

For further investigation and analysis in modal packages, like ME-Scope, the FRF complex data (Real/Imag/Ampl/ Phase), coherence, excitation and responses can be exported to the UFF (Universal File Format).

Feature matrix



DEWESoft X DSA
Data acquisition
STRUCTURAL MODELLING
Interactive Geometric Modelling
UFF geometry import
IGES geometry import
DATA INPUT / OUTPUT
Time- and frequency-domain data import
Time- and frequency domain data and 2D graphics output
Modal frequency and damping tabular output
Mode shapes animation AVI output
SIGNAL PROCESSING
Trend removal
Signal extraction
Windowing (Hanning, exponential, power windows, etc.)
ODS RESPONSE MODAL ANALYSIS
Time ODS
Frequency ODS
EMA EXPERIMENTAL MODAL ANALYSIS
Single-point hammering / multi-point response
Single-point response / point-by-point hammering
Single shaker excitation / multi-point response
SIMO Circle-Fit estimation
SIMO algorithm: EMA SelBand
SIMO FRF estimate
SIMO FRF curve fitting
Multi reference point hammering MRIT separate measurements
Multi shaker excitation / multi-point response
MIMO frequency response estimate
MIMO frequency response curve fitting
Narrow Band: MIMO algorithm (FSDD)
Selective Band: SelBand1 MIMO Algorithm 1 (FDPR)
Selective Band: SelBand2 MIMO Algorithm 2 (FDPR)
Broadband: BroBand MIMO algorithm (p-LSCF)
Wideband frequency/damping Automatic Identification
Modal stabilisation diagram
Wideband curve fitting
OMA OPERATIONAL MODAL ANALYSIS
Narrowband OMA NarBand Full (FSDD)
Environmental excitation at full power spectral density estimation
Broadband OMA BroBand (p-LSCF)
Semi-h-PSD power spectral density estimation
Wideband h-PSD curve fitting
Wideband frequency/damping Automatic Identification
Mode indicator factor MIF
Modal Animation
MAC modal correlation matrix technology
MAC dimensional and three-dimensional graphics display
MAC table shows
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