Elastic Bar Transfer Function Determination Using Two-Point Strain Measurements

This paper presents an experimental method of determining the elastic bar´s transfer functions in the form of formulas. The method is based on the two-point measurement of the elastic strain waves propagating inside the bar, the spectral analysis of these waves, and making use of the general solution of the equation of movement of the bar in the frequency domain. The determined transfer functions of the bar are used for impulsive strain waveform reconstruction by means of deconvolution in the frequency domain and for the validity check of the reconstruction. The application of this method to the reconstruction of impact pressure waveforms is presented.