Chladni Patterns

By observing the two-dimensional standing wave oscillation and resonance patterns, we can understand the famous Kraney pattern. The exhibit consists of a microphone device, a groove booth, thin plates, fine sand, vibration devices, and buttons. In this exhibit, sand scattered on large metal blocks will jump according to the vibration of participants' voices. The speaker transmits the vibration generated by visitors' voice to the center of the metal block, and the vibration radiates outward from the center, reflects back at the edges of the square, and superimposes a pattern of stillness and vibration. When participants reach the exact pitch, the sand spontaneously forms elegant geometric patterns. Target audience: Adolescents aged 6-15. Display format: Electromechanical interactive device operation instructions (audience experience) 1 Visitors press the "Start" button at the exhibit area; 2. When visitors speaks loudly into the microphone, sand scattered on large metal blocks will vibrate and jump according to the sound; 3. Dangshen.

Interaction type: Interactive installation. The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

In the 18th century, German physicist Ernst Cradny conducted an experiment in which he placed a wide metal sheet and evenly sprinkled sand on it. Then, using the bowstring to pull, these fine sands automatically arrange into different beautiful patterns, and as the rhythm of the bowstring pulling increases, the patterns also constantly change and become more complex - the famous Craney pattern. Reference materials.

Every unit leaves the factory after a running test: mechanisms cycled, electronics burned in, edges dressed, fixings torqued and marked. Wear parts — bearings, sliders, lamps, belts, touch panels — are modular and listed on the spare-part sheet, so a venue technician can replace them without returning the exhibit. Crating is plywood with foam blocking; the loading plan and packing list travel with the shipment.