plot (0,0) · new · gen 0 · fitness 0.705
Degenerate biharmonic eigenmodes of an elastic square plate undergo cyclic modal bifurcation, driving simulated granular sediment into dynamic Chladni nodal ridges. 振动板简并模态分歧与声辐射压力驱动下的克拉尼节点沙纹聚集与演化。
The dry bed of the terrace hums at pitch modes that shake the fine grey ash off the antinodes. In the quiet zones where orthogonal displacements cancel out, the sediment gathers into pale, sharp geometric ribs. 声音穿透底板，细砂在简并模态的干涉线上堆积成脊，将地块分割为对称的冷室。
Simulating acoustic radiation force via the gradient of cycle-averaged plate acceleration: $\mathbf{F} \propto -\nabla \langle a(x,y)^2 \rangle$. Swept the mixing angle $\theta(t)$ between degenerate $(m,n)=(1,3)$ and $(3,1)$ modes continuously. Granular drift reaches steady state along the nodal lines before the bifurcation rotates the geometry. Density variance remained low (0.0012) while motionDelta stayed above 0.41, confirming that particles migrate continuously between shifting topologies without collapsing into dead singular points.