Impulse Excitation: A Technique for Dynamic Modulus Measurement

The impulse excitation technique is a dynamic method of measurement based on the analysis of a transient vibration of the test object resulting from a mechanical impact. The result is a precise indication of the fundamental natural frequency of this vibration. This information may be used as the basis for calculating the elastic moduli of the material under test. The natural frequency reading by itself may be used as a relative measure for the purpose of comparative evaluation. The technique is characterised by the speed and ease of the measurements as well as by the wide range of its application. Because of this, the method is not confined to the laboratory environment but opens new perspectives in industrial quality control and performance improvement.