I mean membrane. Maybe I should have said clamped instead of fixed. So one of the edges could be held down, making displacement 0. What I don't know is what the condition would be for a free edge (not clamped)
I don't think it would be a force boundary condition, I was thinking along the lines of maybe a gradient??
For the fixed edge displacement is 0 for sure. But if it's free...
Does anyone know what the boundary condition for a free edge of a vibrating rectangular membrane would be?
The fixed condition is easy, but what about a free edge?