Method of measuring propagation characteristics of mechanical waves in spatial structure, esp. for tubular or beam structures, - involves stimulating mechanical waves in structure at first point and deriving transfer function from vibration values measured at other points at distance from stimulation point and each other

摘要

The method involves stimulating (5) mechanical waves in the structure (20) at a first point, measuring the vibrations at other points at a distance from the stimulation point and from each other and deriving the transfer function of the waves from the measured values. The waves are produced by a striking pulse whose pulse shape, esp. the pulse width and height, are set automatically according to a Fourier synthesis. The structure has stimulated mechanical waves with sufficient energy at each frequency whereby the difference between a theoretical dispersion relationship and a value derived from the measurements is minimal.