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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the controllers' design to stabilize ground resonance helicopter

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Author(s):
Ignacio da Silva, Jose A. [1] ; Bueno, Douglas D. [2] ; de Abreu, Gustavo L. C. M. [1]
Total Authors: 3
Affiliation:
[1] Sao Paulo State Univ UNESP, Fac Engn Ilha Solteira, Dept Mech Engn, Ave Brasil 56, Sao Paulo, SP - Brazil
[2] Sao Paulo State Univ UNESP, Fac Engn Ilha Solteira, Dept Math, Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF VIBRATION AND CONTROL; v. 25, n. 23-24, p. 2894-2909, DEC 2019.
Web of Science Citations: 0
Abstract

Ground resonance (GR) in helicopters is a potentially catastrophic instability commonly caused by coalescence of the regressive cyclic blade lag mode with the fuselage motion in certain rotor speed ranges. It can limit the helicopter operational envelope and the design of this type of vehicle can become a difficult task. Although a broad class of actuators allows the use of active and semi-active techniques to design feedback-based control systems, a limited number of works in the literature introduce formulations to compute the controller gain to suppress this phenomenon. Also, commonly, a control approach defines a feedback, particularly to a specific rotor speed. In this context, this work introduces an alternative methodology to design an active control system to stabilize GR of a helicopter. The proposed approach can suppress this instability in all rotor speed ranges by using only one control gain. Two strategies are proposed based on linear matrix inequalities (LMIs). The Lyapunov stability criteria are used and the unstable rotor speed is considered as an uncertain parameter to define an associated convex space. Using convex optimization, a robust control gain is computed until all the unstable rotor speed range is stabilized. Numerical simulations are carried out to demonstrate the effectiveness of this methodology. The results confirm the viability of the proposed approach to design active and semi-active controllers. (AU)

FAPESP's process: 16/05988-2 - Active vibration control of ground resonance phenomenon in helicopters using piezoelectric materials incorporated on the blades
Grantee:José Augusto Ignácio da Silva
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)