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Force control of semi-active valve lag dampers for vibration reduction in helicopters

Force control of semi-active valve lag dampers for vibration reduction in helicopters
Force control of semi-active valve lag dampers for vibration reduction in helicopters

This study considers the design of a closed-loop force-tracking system for a semi-active damper, designed to be used to reduce in-plane vibrations caused by helicopter rotor blades during steady-state forward flight conditions. The study describes the development of the control law and includes details of (i) how the initial mathematical model of the system is adapted for controller design; (ii) how a non-linear dynamic inversion (NDI) control law is modified into a form suitable for implementation; and (iii) how the free parameters in the NDI controller can be optimised for various different operational modes. The success of the approach is demonstrated through both force-tracking simulations and also more comprehensive tests in which the controller is incorporated into a large-scale vibration simulation of the AgustaWestland 101 helicopter. The results show that the NDI-based controller can provide a satisfactory level of performance and hence greatly assist in the reduction of unwanted vibrations.

1751-8644
409-419
Morales, Rafael Mauricio
c7ed0495-37aa-49a6-ab3b-f0cab52eee91
Turner, Matthew C.
6befa01e-0045-4806-9c91-a107c53acba0
Court, Peter
3652c7d2-7622-4b4d-b78a-81b832b706f1
Hilditch, Ross
e864b759-1712-4b5f-b539-f91550df4b0f
Postlethwaite, Ian
d016e279-c610-4e01-ac84-8292ba5a7a85
Morales, Rafael Mauricio
c7ed0495-37aa-49a6-ab3b-f0cab52eee91
Turner, Matthew C.
6befa01e-0045-4806-9c91-a107c53acba0
Court, Peter
3652c7d2-7622-4b4d-b78a-81b832b706f1
Hilditch, Ross
e864b759-1712-4b5f-b539-f91550df4b0f
Postlethwaite, Ian
d016e279-c610-4e01-ac84-8292ba5a7a85

Morales, Rafael Mauricio, Turner, Matthew C., Court, Peter, Hilditch, Ross and Postlethwaite, Ian (2014) Force control of semi-active valve lag dampers for vibration reduction in helicopters. IET Control Theory and Applications, 8 (6), 409-419. (doi:10.1049/iet-cta.2012.0397).

Record type: Article

Abstract

This study considers the design of a closed-loop force-tracking system for a semi-active damper, designed to be used to reduce in-plane vibrations caused by helicopter rotor blades during steady-state forward flight conditions. The study describes the development of the control law and includes details of (i) how the initial mathematical model of the system is adapted for controller design; (ii) how a non-linear dynamic inversion (NDI) control law is modified into a form suitable for implementation; and (iii) how the free parameters in the NDI controller can be optimised for various different operational modes. The success of the approach is demonstrated through both force-tracking simulations and also more comprehensive tests in which the controller is incorporated into a large-scale vibration simulation of the AgustaWestland 101 helicopter. The results show that the NDI-based controller can provide a satisfactory level of performance and hence greatly assist in the reduction of unwanted vibrations.

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More information

e-pub ahead of print date: 3 April 2014
Published date: 17 April 2014

Identifiers

Local EPrints ID: 439243
URI: http://eprints.soton.ac.uk/id/eprint/439243
ISSN: 1751-8644
PURE UUID: ad93b3c3-a426-4e26-aa44-50c3c2170d04

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Date deposited: 07 Apr 2020 16:31
Last modified: 05 Feb 2024 18:00

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Contributors

Author: Rafael Mauricio Morales
Author: Matthew C. Turner
Author: Peter Court
Author: Ross Hilditch
Author: Ian Postlethwaite

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