Early identification of a vortex ring phase

US9037316B2 · kind B2 · utility

Assignees

• DEUTSCHES ZENTRUM FÜR LUFT—UND RAUMFAHRT E.V. · DE
• OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES · FR

Inventors

• Max Abildgaard · Braunschweig, DE
• Laurent Binet · Grans, FR

Key dates

• Filing date: Jul 13, 2011
• Grant date: May 19, 2015
• Expiry date: Jul 13, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C27/006
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for early detection of the vortex ring state in a helicopter includes steps of establishing flight control signals for flight control with regard to the vertical movement axis of the helicopter, detecting resultant movements in the vertical movement axis of the helicopter, and detecting an impending vortex ring state of the helicopter in accordance with a correlation between the flight control signals and the vertical movements in the vertical movement axis.