{"id":612017,"date":"2024-03-09T15:20:01","date_gmt":"2024-03-09T12:20:01","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/an-oscillating-robot-can-propel-itself-via-the-reflection-of-water-waves\/"},"modified":"2024-03-09T15:20:01","modified_gmt":"2024-03-09T12:20:01","slug":"an-oscillating-robot-can-propel-itself-via-the-reflection-of-water-waves","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/an-oscillating-robot-can-propel-itself-via-the-reflection-of-water-waves\/","title":{"rendered":"#An oscillating robot can propel itself via the reflection of water waves"},"content":{"rendered":"
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\n Wave-generating robot boat. (a)\u00a0Photo of boat generating 17.1\u00a0Hz waves. (b)\u00a0Schematic of the eccentric motor vibrating the boat to generate waves; propellers shown in (a) are not used in this study and thus omitted in (b). (c)\u00a0Diagram of the tank wherein all experiments were performed. A backlit checkerboard enables Fast Checkerboard Demodulation for spatiotemporal surface reconstruction. (Inset) Fast Checkerboard Demodulation determines fluid surface height using the instantaneous distortion of a checkerboard by surface perturbations. (d1)\u2013(d2)\u00a0Time series<\/a> of repulsion from (17.1\u00a0Hz) and attraction toward (33.5\u00a0Hz) wall, respectively. (e)\u00a0Evolution of perpendicular hull-wall distance for repeated repulsive and attractive trials at 17.1\u00a0Hz and two different initial distances. Credit: Physical Review Letters<\/i> (2024). DOI: 10.1103\/PhysRevLett.132.084001
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Odd things can happ<\/a>en when a wave meets a boundary. In the ocean, tsunami waves that are hardly noticeable in deep water can become quite large at the continental shelf and shore, as the waves slow and their mass moves upward.<\/p>\n

The Casimir effect is the attraction of two uncharged, parallel plates because virtual quantum mechanical waves with wavelengths greater than the plate separation are excluded between them, so virtual fields outside the plates push them inward. Parallel plates partially submersed in water attract one another<\/a> as longer wavelength momentum-carrying water waves are excluded from the central region. (Speculation about a maritime Casimir effect between docked ships is still under<\/a> debate<\/a>.)<\/p>\n

Now scientists have shown that a floating, symmetric oscillating robot will experience forces when it comes close to a boundary. These forces can be used for self-propulsion without the need for more typical mechanisms such as a propeller.<\/p>\n

The study is published<\/a> in the journal Physical Review Letters<\/i>.<\/p>\n

Led by Ph.D. student Steven W. Tarr at the Georgia Institute of Technology<\/a>, the team built a 3D-printed circular float 12 cm in diameter with a mass of 368 g. Onboard, they attached battery-operated motors that vibrate the boat with a controllable frequency, producing a vibrating motion along the fore-aft (roll) axis. When powered on, the craft produced a series of symmetrical waves on the water surface, all the same wavelength, radiating away from it.<\/p>\n


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