High-speed video of the resonance shapes of a smart beam

This video shows the first five vibration mode shapes of a "smart" cantilever beam, filmed by a high-speed video microscope (Keyence VW-9000 series).

The first two and the fourth modes are transversal, meaning that the movement is out of plane. The deformation patterns are clearly visible for the first three transversal modes, for which the latter two are the more interesting and complex. Note the locations, where the beam does not seem to move (modes 2,4) - these are the so called resonance nodes. Only a very slight movement is detectable for the third vibration mode, which is deformed sideways.The fifth mode has a twisting resonant shape and this cannot be detected on the video presented here. Resonance frequencies are located at 8.1, 50.1, 100.0, 139.1, 192.2, 274.4 and 448.1 Hz.

The aluminum cantilever is equipped with piezoelectric transducers. These transducers are working as actuators (only the two closer to the fixed end) and are driven by a sinusoidal signal with a frequency equal to the resonant frequency of the structure. The actuators are supplied with the sinusoidal excitation signal through an operational amplifier, connected to the xPC Target rapid software prototyping platform.

This video is made for the "Noise and Vibration: Emerging Methods" conference, see http://www.novem2012.unina.it for more information. You may find additional detail in the following conference paper: Gergely Takács and Boris Rohaľ-Ilkiv. High-Speed Video Microscopy of the Resonant Modes of a Smart Beam. In: Proceedings of the NOVEM2012 - Noise and Vibration: Emerging Methods conference. 1-4 April, 2012. Sorrento, Italy. Paper number 078.

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Science & Technology

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