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ALFORD WHIRL DETECTION AND CONTROL DURING FLIGHT

IP.com Disclosure Number: IPCOM000257843D
Publication Date: 2019-Mar-14
Document File: 2 page(s) / 175K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention proposes a method to monitor the engine architecture specific unique frequency band of vibration (NSV) and operation parameters during flight and, if parameters value cross a threshold, an action is to reduce the power to control/suppress instability.

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ALFORD WHIRL DETECTION AND CONTROL DURING FLIGHT

ABSTRACT

This invention proposes a method to monitor the engine architecture specific unique frequency

band of vibration (NSV) and operation parameters during flight and, if parameters value cross a

threshold, an action is to reduce the power to control/suppress instability.

BACKGROUND

Alford whirl forces result in rotor instability which leads to stall events in the field. This problem

is generally addressed passively by mechanical design changes like rotor support stiffness and

damping adjustments. Stalls in flight are a significant event which can cause severe damage to an

engine and may risk safety of flight. With the detection and active control of rotor instability in

flight, the risk of stall may be reduced.

DETAILED DESCRIPTION

The current capability of Full Authority Digital Engine Control (FADEC) enables measurement

of the non-synchronous vibrations (NSV) and engine operational parameters (such as engine

speed, pressures, temperatures, pressure difference across oil supply etc.), which has potential of

detecting whirl conditions during flight/operation and an opportunity of controlling it.

A FADEC can be configured to monitor NSV (non-synchronous vibration) amplitude (frequency

range based on individual engine architecture’s dynamics) during flight.

Monitoring NSV amplitude and operational parameters during flight provides an indication of a

potential instability event, thus instability risks can be controlled/av...

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