# US 8,740,133 B2 · Aircraft including an engine controlled by synchrophasing

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- Number: US 8,740,133 B2
- Document ID: US8740133B2
- Status: Granted
- Kind: B2
- Application number: 13/055,340
- Filed: 2009-07-21
- Published: 2011-08-04
- Granted: 2014-06-03
- Earliest claimed: 2008-07-24
- Assignees: Airbus Operations GmbH
- Applicants: Jean-Michel Saucray; Philippe Chareyre
- Inventors: Jean-Michel Saucray; Philippe Chareyre
- Web page: https://patentgrep.com/patent/US8740133B2

## CPC

- B64D 31/12: for equalising or synchronising power plants
- B64C 11/008: {characterised by vibration absorbing or balancing means}
- B64C 11/48: Units of two or more coaxial propellers
- B64C 11/50: Phase synchronisation between multiple propellers
- B64D 27/08: within, or attached to, fuselages
- B64D 27/026: {comprising different types of power plants, e.g. combination of a piston engine and a gas-turbine (Hybrid electric aircraft B64D27/33)}
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 29/49229: Prime mover or fluid pump making
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64C: AEROPLANES; HELICOPTERS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An aircraft including at least one engine having counter-rotating rotors, the engine or at least one of the engines having imbalances associated with at least one ellipse. The aircraft includes at least one vibration damper attached in an arrangement such that, at a given engine speed and for at least one given common direction of a large axis of the ellipse or at least one of the ellipses, a speed related to the two ends of the damper is higher than for any other arrangement of the damper.

## Claims

### Claim 1

Method for manufacturing an aircraft comprising at least one engine having counter-rotating rotors, the engine or at least one of the engines having imbalances associated with at least one ellipse, the method comprising the step of attaching at least one vibration damper to the aircraft in an arrangement such that, at a given engine speed and for at least one given direction of a major axis of the ellipse or at least one of the ellipses, a relative speed of two ends of the damper is higher than for any other arrangement of the damper.

### Claim 2

Aircraft comprising at least one engine having counter-rotating rotors, the engine or at least one of the engines having imbalances associated with at least one ellipse, the aircraft comprising at least one vibration damper attached in an arrangement such that, at a given engine speed and for at least one given direction of a major axis of the ellipse or at least one of the ellipses, a relative speed of two ends of the damper is higher than for any other arrangement of the damper.

### Claim 3 (depends on 2)

Aircraft according to claim 2, wherein the arrangement of the damper is such that the relative speed is higher than for any other arrangement of the damper, irrespective of the direction of the major axis.

### Claim 4 (depends on 2)

Aircraft according to claim 2, wherein the arrangement of the damper is such that there is one direction of the major axis for which, at the given speed, the relative speed of the two ends is higher than for any other direction of the major axis.

### Claim 5 (depends on 2)

Aircraft according to claim 2, which comprises at least one sensor, capable of measuring the engine vibrations.

### Claim 6 (depends on 2)

Aircraft according to claim 2, which comprises means capable of controlling the engine or at least one of the engine in order to keep the major axis in a constant direction.

### Claim 7 (depends on 2)

Method for controlling an aircraft according to claim 2, wherein the engine or at least one of the engines is controlled so as to keep the major axis in a constant direction.

### Claim 8 (depends on 1)

Computer program comprising instructions capable of controlling execution of a method according to claim 1 when it is executed on a computer.

### Claim 9 (depends on 8)

Data storage medium comprising a program according to claim 8.