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A modelling technique for active control design studies with application to spacecraft microvibrations

A modelling technique for active control design studies with application to spacecraft microvibrations
A modelling technique for active control design studies with application to spacecraft microvibrations
Microvibrations, at frequencies between 1 and 1000 Hz, generated by on board equipment, can propagate throughout a spacecraft structure and affect the performance of sensitive payloads. To investigate strategies to reduce these dynamic disturbances by means of active control systems, realistic yet simple structural models are necessary to represent the dynamics of the electromechanical system. In this paper a modeling technique which meets this requirement is presented, and the resulting mathematical model is used to develop some initial results on active control strategies. Attention is focused on a mass loaded panel subjected to point excitation sources, the objective being to minimize the displacement at an arbitrary output location. Piezoelectric patches acting as sensors and actuators are employed. The equations of motion are derived by using Lagrange's equation with vibration mode shapes as the Ritz functions. The number of sensors/actuators and their location is variable. The set of equations obtained is then transformed into state variables and some initial controller design studies are undertaken. These are based on standard linear systems optimal control theory where the resulting controller is implemented by a state observer. It is demonstrated that the proposed modeling technique is a feasible realistic basis for in-depth controller design/evaluation studies.
2158-2166
Aglietti, G.S.
e44d0dd4-0f71-4399-93d2-b802365cfb9e
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Langley, R.S.
3fac905f-197c-45b4-bd7c-c2df2235e279
Rogers, E.
611b1de0-c505-472e-a03f-c5294c63bb72
Aglietti, G.S.
e44d0dd4-0f71-4399-93d2-b802365cfb9e
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Langley, R.S.
3fac905f-197c-45b4-bd7c-c2df2235e279
Rogers, E.
611b1de0-c505-472e-a03f-c5294c63bb72

Aglietti, G.S., Gabriel, S.B., Langley, R.S. and Rogers, E. (1997) A modelling technique for active control design studies with application to spacecraft microvibrations. Journal of the Acoustical Society of America, 102 (4), 2158-2166. (doi:10.1121/1.419631).

Record type: Article

Abstract

Microvibrations, at frequencies between 1 and 1000 Hz, generated by on board equipment, can propagate throughout a spacecraft structure and affect the performance of sensitive payloads. To investigate strategies to reduce these dynamic disturbances by means of active control systems, realistic yet simple structural models are necessary to represent the dynamics of the electromechanical system. In this paper a modeling technique which meets this requirement is presented, and the resulting mathematical model is used to develop some initial results on active control strategies. Attention is focused on a mass loaded panel subjected to point excitation sources, the objective being to minimize the displacement at an arbitrary output location. Piezoelectric patches acting as sensors and actuators are employed. The equations of motion are derived by using Lagrange's equation with vibration mode shapes as the Ritz functions. The number of sensors/actuators and their location is variable. The set of equations obtained is then transformed into state variables and some initial controller design studies are undertaken. These are based on standard linear systems optimal control theory where the resulting controller is implemented by a state observer. It is demonstrated that the proposed modeling technique is a feasible realistic basis for in-depth controller design/evaluation studies.

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Published date: 1997
Organisations: Southampton Wireless Group

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Local EPrints ID: 252517
URI: https://eprints.soton.ac.uk/id/eprint/252517
PURE UUID: ab095515-86f5-4b0d-91d1-452341696bb2

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Date deposited: 07 Mar 2004
Last modified: 05 Oct 2018 12:11

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