eigendrum ripple

A drum vibrating in its (0,4) mode

The same drum in its (0,4) mode: four rings, no spokes. Sand settles on the three circles that never move; the steel keeps every wave.

Δu + λu = 0u(r) = J₀(11.79 r)

Finish

€49.00

No VAT charged under §19 UStG. Plus shipping.

Size
22 mm Ø, 3.6 mm deep
Weight
≈ 4.5 g
Material
316L stainless steel, PVD

A clamped disc vibrating in its (0,4) eigenmode: a central peak ringed by ripples. The back shows the opposite phase, a dimple.

eigendrum ripple

Worn and boxed

eigendrum ripple eigendrum ripple eigendrum ripple

The photos are AI-generated visualisations of the real design.