Method and arrangement for nondestructive classification

Details Method and arrangement for nondestructive classification Method and arrangement for nondestructive classification

G - Physics

01

N

G01N 3/30 (2006.01) B07C 5/34 (2006.01) G01M 7/08 (2006.01) G01N 29/04 (2006.01) G01N 33/46 (2006.01)

Patent

CA 2258514

Method and device for nondestructive determination of rigidity, strength and/or structural properties of preferably oblong and/or plate-shaped objects (11), alternatively determination of the geometrical dimensions of the object, through impact excitation and registration of resonance frequencies of natural modes of the object. According to the invention resonance frequency from at least one of the natural modes of the object is used, which resonance frequency is achieved by bringing the object (11) in vibration by means of a stroking body (24, 31, 38), and substantially controlling the initiation of the motion of the stroking body (24, 31, 38) and subsequent physical impact in time and space by motion of the object (11).

Procédé et dispositif servant à déterminer de façon non destructive les propriétés de rigidité, de résistance ou de structure d'objets (11) de préférence oblongs ou plats ou, dans un autre mode de réalisation, les dimensions géométriques de l'objet au moyen de techniques d'excitation par impact et de concordance de fréquences de résonance de modes naturels de l'objet. Selon l'invention, on utilise la fréquence de résonance émise par au moins un des modes naturels de l'objet, ladite fréquence étant obtenue en mettant l'objet (11) en vibration au moyen d'un corps de frappe (24, 31, 38) et en commandant sensiblement le déclenchement du déplacement du corps de frappe (24, 31, 38) et l'impact physique subséquent dans le temps et l'espace par déplacement de l'objet (11).

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