The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2013
Filed:
Nov. 23, 2010
Hanno Brenner, Braunschweig, DE;
Mario Hamers, Donauwoerth, DE;
Hanno Brenner, Braunschweig, DE;
Mario Hamers, Donauwoerth, DE;
Abstract
For damping vertical oscillations in a helicopter having a rotor drive-unit and an airframe and carrying an external payload suspended via a lifting gear from a load attachment point on the airframe, oscillation sensors are arranged on the helicopter, and an actively operated linear actuator is provided between the load attachment point and the lifting gear. With the oscillation sensors excitations of a first mode of the vertical oscillations, in which the external load and the rotor drive-unit oscillate together relative to the load attachment point, and of a second mode of the vertical oscillations, in which the load attachment point oscillates relative to the external load and the rotor drive-unit, are sensed, and forces opposed to the vertical oscillations are applied with the actuator between the load attachment point and the lifting gear as a function of the phase and of the amplitude of the sensed excitations.