A cellular structure (400), comprising:;a thickness dimension defined by cell walls and a surface plane defined by the edges of interconnecting cells, wherein the rotor and stator define a rub path (402) on the surface plane where a rotor tip of the rotor moves past the surface plane;;the surface plane comprising a first cellular region of the cells (406) having a first maximum dimension in the surface plane, wherein cells of the cellular structure defining the rub path include greater than 90% of the cells having the first maximum dimension;;the surface plane comprising a second cellular region of the cells (404) having a second maximum dimension in the surface plane, wherein the second dimension is less than the first dimension, wherein cells of the cellular structure outside the rub path include greater than 90% of the cells having the second maximum dimension; and;the cell walls of at least one of the first or second cellular regions having a non-linear contour or variable thickness.
展开▼
