eigendrum petal

A drum vibrating in its (8,2) mode

A round drum, struck so it rings in its (8,2) mode. Sixteen spokes and one ring stay still while the rest moves. The sand finds the still lines; the steel keeps the motion.

Δu + λu = 0u(r, θ) = J₈(16.04 r) cos 8θ

Finish

€49.00

No VAT charged under §19 UStG. Plus shipping.

Size
22 mm Ø, 3.4 mm deep
Weight
≈ 4.5 g
Material
316L stainless steel, PVD

A clamped disc vibrating in its (8,2) eigenmode: an eight-petal flower inside a ring of lobes. The back is turned by half a petal.

eigendrum petal

Worn and boxed

eigendrum petal eigendrum petal eigendrum petal

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