Patent · US Expired

Rotor blade

US5730581A · kind A · utility

9Cited by

8References

16Claims

0Family size

Assignee

Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.V. · DE

Inventors

Andreas Buter · Braunschweig, DE
Matthias Piening · Braunschweig, DE

Key dates

Filing date	Aug 2, 1996
Grant date	Mar 24, 1998
Priority date	—
Expiry date	Aug 2, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T50/30
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A rotor blade made of fiber-reinforced synthetic resin has a profile which, at least in the region of the blade tip is designed so as to be twistable by actuators about the rotor blade longitudinal axis. The torsion skin of the rotor blade in the region of the blade tip is designed anisotropically in the sense of a tension/torsion coupling and a controllable actuator, which acts in a longitudinal direction of the rotor blade upon the rotor blade tip, is disposed in the rotor blade spar. To achieve anisotropy, the torsion skin is a uni-directional winding having a winding angle of less than 45.degree. relative to the rotor blade longitudinal axis. The winding angle is dependent upon the force-to-displacement ratio of the actuator and may lie between 18.degree. and 40.degree.. In the region of the blade tip, the anisotropic torsion skin is disposed resting loosely on the rotor blade spar.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.