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Statements

Subject Item
dbr:Impulse_excitation_technique
rdf:type
dbo:Software
rdfs:label
Impulserregungstechnik Impulse excitation technique
rdfs:comment
Die Impulserregungstechnik ist eine Methode zur zerstörungsfreien Bestimmung elastischer Materialeigenschaften. Ein zu messender Prüfling wird zerstörungsfrei und durch einmaligen elastischen Stoß in einer definierten Schwingung erregt. Das Schwingungssignal wird durch ein geeignetes Medium aufgenommen und analysiert. Ein speziell für diese Methode entwickeltes Messgerät analysiert die Schwingung und zeigt die Frequenz der gezielt erregten Schwingung an. Form und Größe des Prüflings sind theoretisch keine Grenzen gesetzt, solange der Prüfling reproduzierbar in der gewünschten Schwingung zu erregen ist. The impulse excitation technique (IET) is a non-destructive material characterization technique to determine the elastic properties and internal friction of a material of interest. It measures the resonant frequencies in order to calculate the Young's modulus, shear modulus, Poisson's ratio and internal friction of predefined shapes like rectangular bars, cylindrical rods and disc shaped samples. The measurements can be performed at room temperature or at elevated temperatures (up to 1700 °C) under different atmospheres.
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The impulse excitation technique (IET) is a non-destructive material characterization technique to determine the elastic properties and internal friction of a material of interest. It measures the resonant frequencies in order to calculate the Young's modulus, shear modulus, Poisson's ratio and internal friction of predefined shapes like rectangular bars, cylindrical rods and disc shaped samples. The measurements can be performed at room temperature or at elevated temperatures (up to 1700 °C) under different atmospheres. The measurement principle is based on tapping the sample with a small projectile and recording the induced vibration signal with a piezoelectric sensor, microphone, laser vibrometer or accelerometer. To optimize the results a microphone or a laser vibrometer can be used as there is no contact between the test-piece and the sensor. Laser vibrometers are preferred to measure signals in vacuum. Afterwards, the acquired vibration signal in the time domain is converted to the frequency domain by a fast Fourier transformation. Dedicated software will determine the resonant frequency with high accuracy to calculate the elastic properties based on the classical beam theory. Die Impulserregungstechnik ist eine Methode zur zerstörungsfreien Bestimmung elastischer Materialeigenschaften. Ein zu messender Prüfling wird zerstörungsfrei und durch einmaligen elastischen Stoß in einer definierten Schwingung erregt. Das Schwingungssignal wird durch ein geeignetes Medium aufgenommen und analysiert. Ein speziell für diese Methode entwickeltes Messgerät analysiert die Schwingung und zeigt die Frequenz der gezielt erregten Schwingung an. Form und Größe des Prüflings sind theoretisch keine Grenzen gesetzt, solange der Prüfling reproduzierbar in der gewünschten Schwingung zu erregen ist.
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