In some sewage plant, there is a water filtering system, which is composed of
the following equipments:
(1) 2(two) sets of long fabric sheets
(2) 2(two) sets of rollers for squeezing the fabric sheets.
(3) a series of some rollers for conveying garbage after filtration.
However, because of the slacking motion of the fabric sheet, wrinkle deformation
is generated at the stitches of the fabric sheets.
This wrinkle is pressurized by rollers, which causes the shortening of durability
of the fabric sheet.
In this case, the non-linear wrinkle deformation is simulated.
