Deutsches Zentrum Fur Luft-und Raumfahrt E.v.

Lucio Flavio Campanile

Holger Hanselka

In a method of obtaining an error signal (15) in a positioning device (1), with which a tool (4) is positioned relative to target object (3), the tool's (4) acceleration in the direction of at least one of the tool's motion components is recorded with at least one sensor (10), and the target object's (3) acceleration in the direction of at least one of the target object's motion components, in which the tool's (4) acceleration is also recorded, is also recorded with at least one sensor (12). A differential signal is formed from the accelerations of the tool (4) and the target object (3).

Method of obtaining an error signal in a positioning device

An aerodynamic structure (9) is provided for example for a landing flap. The aerodynamic structure comprises an outer skin (11), which is deformable in cross section longitudinal to an air stream direction (12). The outer skin (11) has deformable ribs (1) with changeable cambering for stiffening the stressed skin in cross section longitudinal to the air stream direction. The ribs (1) comprise a closed flexible external girdle (2). The external shape of the external girdle (2) corresponds to the course of the outer skin (11). Furthermore, the ribs (1) comprise a plurality of stiffening struts (3) of constant length, which engage the external girdle (2) at both of their ends.

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Braunschweig, Germany

Lucio Flavio Campanile