not rigid, but has some mass spring damper system.

But I argue that,

in the area far

away from the boundary.

For example, one Lambda

apart from the boundary,

the vibration characteristics of

this area will be quite similar with or

approximately similar with what we obtained using

this homogeneous boundary condition based Eigenfunction.

Okay for bending case,

as I said before only difference is

the mode shape at the boundary is different,

because bending has to satisfy

the boundary condition over

here asking the derivative.

Derivative has to be zero to

satisfy the momentum boundary condition.

So in this case,

instead of sin the function would be sinh hyperbolic.

Hyperbolic sin, some depending on

the boundary condition that can

go to the hyperbolic cosine.

Expanding this to the membrane

and plate can be

conceptually easily implemented.

Okay, this is very briefly explained.

What I meant by the what I observed,

the vibration of stream beam

so on and so on, then mathematical domain.