- #1
DuckAmuck
- 238
- 40
Minimal surfaces are sort of the "shortest path" but in terms of surface shapes.
So I figured I could characterize the shape of a hammock by adding the influence of gravity, much like you can get the shape of a catenary cable (y=cosh(x)).
The equation of motion I get from the Lagrangian is:
[tex] z_x^2 + z_y^2 + 1 = z ( z_{xx} (z_y^2 + 1) + z_{yy} (z_x^2 +1) - 2 z_x z_y z_{xy} )[/tex]
where z is the height of a point on the surface mapped to (x,y).
Of course, this is likely to have non-unique solutions just like other minimal surfaces.
One of the solutions I found is a cone:
[tex] z = \sqrt{x^2 + y^2} [/tex]
What does *not* work as a solution is a "2-d catenary", which is what I initially suspected as solution
[tex] z = cosh(x)cosh(y) [/tex]
Anyone else attempt this kind of problem? What were your findings? I'm basically just plugging things into the equation of motion and seeing if they work.
So I figured I could characterize the shape of a hammock by adding the influence of gravity, much like you can get the shape of a catenary cable (y=cosh(x)).
The equation of motion I get from the Lagrangian is:
[tex] z_x^2 + z_y^2 + 1 = z ( z_{xx} (z_y^2 + 1) + z_{yy} (z_x^2 +1) - 2 z_x z_y z_{xy} )[/tex]
where z is the height of a point on the surface mapped to (x,y).
Of course, this is likely to have non-unique solutions just like other minimal surfaces.
One of the solutions I found is a cone:
[tex] z = \sqrt{x^2 + y^2} [/tex]
What does *not* work as a solution is a "2-d catenary", which is what I initially suspected as solution
[tex] z = cosh(x)cosh(y) [/tex]
Anyone else attempt this kind of problem? What were your findings? I'm basically just plugging things into the equation of motion and seeing if they work.