Vibration testing system and method using acoustical waves

Details Vibration testing system and method using acoustical waves Vibration testing system and method using acoustical waves

G - Physics

01

M

G01M 7/02 (2006.01) G01M 7/00 (2006.01) G01N 29/00 (2006.01)

Patent

CA 2276693

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 testing unit are preferably contained in an acoustic insulation chamber. The driving subsystem preferably comprises a controller for generating an excitation input signal having a desired frequency spectrum and an amplifier for generating therefrom an electrical output signal to be fed to the loudspeaker. The controller is preferably implemented in a feedback configuration using a transducer such as an accelerometer of a microphone for providing the required input control signal. 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, and being respectively fed by with first and second electrical output signals having respective complementary frequency spectrums adjacent a crossover cutoff frequency. The first and second electrical output signals are preferably in opposed phase relationship in the area of the crossover cutoff frequency to provide better power efficiency. The apparatus and method according to the invention provide improved control over the power spectral density profile of the imparted vibration. The apparatus is particularly useful for ESS testing a printed circuit board, or several PCB's simultaneously using a special fixture therefor.

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