Abstract:
Airfoil blades are disclosed having a coating thereon that includes a polyurethane, a polysiloxane, and a linking agent that promotes a connection between the polyurethane and the polysiloxane.
Abstract:
L'invention concerne un dispositif d'absorption d'énergie cinétique pour élément de structure d'aéronef susceptible d'être soumis à un impact dynamique, comportant: - une enveloppe externe (21) en matériau composite tressé apte à conserver, après impact, une intégrité, - un cœur en mousse (22), contenu dans l'enveloppe externe et apte à remplir au moins partiellement ladite enveloppe externe, ledit cœur en mousse étant apte à absorber au moins partiellement l'énergie cinétique générée par l'impact, et - des éléments de renfort comportant au moins une préforme en fibres composites sèches (30) intégrée dans le cœur en mousse pour dissiper, en association avec le cœur en mousse, l'énergie cinétique générée par l'impact. L'invention concerne également un procédé d'intégration de ce dispositif d'absorption d'énergie cinétique.
Abstract:
A rotor blade including a main portion having a main portion leading edge shield; a main portion impact-resistant layer formed on a nose of the leading edge shield; a main portion erosion-resistant layer formed on a top and bottom of the main portion, rearward of the main portion impact-resistant layer; a main portion foil formed on the top and the bottom of the main portion rearward of the main portion erosion-resistant layer; a tip cap having a tip cap leading edge shield; a tip cap impact-resistant layer formed on a surface of the tip cap leading edge shield; and a tip cap foil formed on the top and the bottom of the tip cap rearward of the tip cap erosion-resistant layer.
Abstract:
A rotor blade assembly is disclosed herein. The rotor blade assembly includes a composite blade portion extending a length from a root to a tip. A leading edge of the composite blade portion extends from the tip to an end point along the length between the tip and the root. The rotor blade assembly also includes a base portion fixed to the composite blade portion proximate to the root. The rotor blade assembly also includes a sheath extending around the composite blade portion. The sheath is positioned along the length adjacent to the base portion and between the root and the end point of the leading edge.
Abstract:
Sounds are generated by an aerial vehicle (101) during operation. For example, the motors and propellers (102) of an aerial vehicle (101) generate sounds during operation. Disclosed are systems, methods, and apparatus for actively adjusting the position of one or more propeller blade treatments (202) of a propeller blade (200) of an aerial vehicle (101) during operation of the aerial vehicle (101). For example, the propeller blade (200) may have one or more propeller blade treatments (202) that may be adjusted between two or more positions. Based on the position of the propeller blade treatments (202), the airflow over the propeller (102) is altered, thereby altering the sound generated by the propeller (102) when rotating. By altering the propeller blade treatments (202) on multiple propeller blades (200) of the aerial vehicle (101), the different sounds generated by the different propeller blades (200) may effectively cancel, reduce, and/or otherwise alter the total sound generated by the aerial vehicle (101).
Abstract:
The present invention regards an aerial article comprising a composite skin (5), a leading edge (1) facing the airflow (a) during the use of the aerial article (3), an erosion resistant coating (7) comprising a metallic material, and an aerodynamic surface (9). The coating (7) partly or entirely covers the composite skin (5) of the aerial article (3), wherein the coating (7) is of such high porosity that moisture transportation (MT) is permitted from the composite skin (5) to the aerodynamic surface (9) of the coating (7), and of such low porosity that erosion protection of the composite skin (5) still is achieved during said use. It also regards a method of applying an erosion resistant coating (7) comprising a metallic material to a composite skin (5) of an aerial article (3). It is made by providing an erosion resistant coating material (45) onto the composite skin (5) over a selected area of the article (3) wherein the coating is porous. Finally, polishing the outer surface (9) of the coating (7) is made so that a smooth aerodynamic surface is achieved.
Abstract:
Dispositif de détection et d'enregistrement de chocs selon plusieurs axes sur un ensemble d'hélice aéronautique constitué d'un moyeu (13) et deux pales (14), caractérisé en ce qu'il comprend une pluralité d'accéléromètres (1) intégrés au moyeu (13) de l'ensemble d'hélice aéronautique (13, 14) et placés au pied respectif d'une pluralité de pales (14) et un module électronique (2) pour enregistrer au cours de la vie toute occurence de chocs à différentsniveaux prédeterminés.
Abstract:
To protect an article with an aerodynamic surface, such as an aeroplane propeller or helicotper rotor, from erosive damage caused by flying particulate matter, a thin elastomeric protective covering is provided. This layer covers approximately 15% of a forward face (15), a leading edge (12), and approximately 90% of the rear face (13) of the article. Typically it is made of polyurethane with hardness between 85 Shore A and 80 Shore D. It is applied by centrifugal casting using a silane (eg gammaglycidoxypropyl-trimethoxysilane) as a coupling agent when bonding to a metal surface such as aluminium.
Abstract:
A fan blade for a turbofan gas turbine engine is disclosed. The fan blade includes a body having a pressure side and a suction side and a cover. The suction side of the body includes an opening and at least one cavity for purposes of reducing the weight of the fan blade. The cover overlays the opening and includes a peripheral edge that is received in a slot defined by the body. The cavities are filled with a sacrificial material.