Vibration testing apparatus and method using acoustical waves

G - Physics – 01 – M

Patent

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G01M 7/00 (2006.01)

Patent

CA 2377578

A vibration testing apparatus using acoustical waves comprises a testing unit including a main enclosure defining a main acoustical cavity and having a baffle provided with a main opening which is aligned with a set of acoustical insulation bands receiving an article to be tested that are clamped on a fixture secured to the baffle, so that the main opening is substantially closed by the article and the acoustical insulation bands. The apparatus includes a main acoustical source comprising a main acoustical transducer such as a loudspeaker which is acoustically coupled to the main acoustical cavity, and a subsystem for driving the loudspeaker which generates acoustical waves imparting vibration to the article accordingly. The apparatus preferably comprise a further acoustical source in the form of one or more further loudspeakers facing the main loudspeaker with the baffle extending therebetween, showing complementary frequency operating ranges. The apparatus is particularly useful for ESS testing of one or more printed circuit boards.

L'invention concerne un appareil pour essais de vibration au moyen d'ondes acoustiques, qui comporte une unité d'essai comprenant une enceinte principale définissant une cavité acoustique principale et ayant un écran acoustique muni d'une ouverture principale qui est alignée avec un ensemble de bandes d'isolation acoustique conçues pour recevoir un article à tester qui est fixé à un dispositif attaché audit écran acoustique, de sorte que l'ouverture principale est sensiblement fermée par l'article et les bandes d'isolation acoustique. Ledit appareil comporte une source acoustique principale comprenant un transducteur acoustique principal tel qu'un haut-parleur qui est acoustiquement couplé à la cavité acoustique principale, et une source acoustique supplémentaire se présentant sous la forme d'un ou de plusieurs autres haut-parleurs qui font face au haut-parleur principal de sorte que l'écran acoustique soit disposé entre cette source supplémentaire et le haut-parleur principal, ladite source acoustique supplémentaire présentant des plages fonctionnelles de fréquences complémentaires.

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