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TECHNICAL PAPERS

Localized Vibration Isolation Strategy for Low-Frequency Excitations in Membrane Space Structures

[+] Author and Article Information
Hiraku Sakamoto

Center for Aerospace Structures, Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429hiraku.sakamoto@colorado.edu

K. C. Park

Center for Aerospace Structures, Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429

J. Vib. Acoust 128(6), 790-797 (Apr 07, 2006) (8 pages) doi:10.1115/1.2203341 History: Received November 11, 2005; Revised April 07, 2006

The present study explores both structural and controller design to attenuate vibration in large membrane space structures, especially due to low-frequency harmonic excitations. It is very difficult for membrane structures to suppress the low-frequency vibration induced by flexible support structures, because a lightly prestressed membrane has extremely low mode frequencies and little damping effect. The present study proposes the use of weblike perimeter cables around a membrane, and the application of simple and lightweight active controllers only along the web cables in order to isolate the membrane from vibration. This strategy successfully reduces the membrane vibration when the web-cable configuration is appropriately tailored. Both linear and nonlinear finite-element analyses exhibit a clear tradeoff between structural mass and control efficiency.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Single web-cable girded membrane design (4)

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Figure 2

Double girded membrane design (7)

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Figure 3

Partitioned web-cable girded membrane structures

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Figure 4

Small collocated actuators/sensors at substructure interfaces

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Figure 5

FE model of single web-cable girded design and example of actuator configuration at cable-support corners

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Figure 6

FRF amplitude in single web-cable girded design for input at Node D

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Figure 7

FE model of double web-cable girded design

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Figure 8

FRF amplitude in double web-cable girded design for input at Node D

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Figure 9

Velocity input applied at Node C in both models

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Figure 10

Out-of-plane transient response of single web-cable girded design for the input applied at Node C

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Figure 11

Out-of-plane transient response of double web-cable girded design for input applied Node C

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Figure 12

Generated force by out-of-plane actuator at Node D in each model

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Figure 13

Total control effort by web-cable substructure-based LQ controllers

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