A Caltech Library Service

Collocated versus Non-collocated Multivariable Control for Flexible Structure

Balas, Gary J. and Doyle, John C. (1990) Collocated versus Non-collocated Multivariable Control for Flexible Structure. In: 1990 American Control Conference. IEEE , Piscataway, NJ, pp. 1923-1928.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Future space structures have many closely spaced, lightly damped natural frequencies throughout the frequency domain. To achieve desired performance objectives, a number of these modes must actively be controlled. For control, a combination of collocated and noncollocated sensors and actuators will be employed. The control designs will be formulated based on models which have inaccuracies due to unmodeled dynamics, and variations in damping levels, natural frequencies and mode shapes. Therefore, along with achieving the performance objectives, the control design must be robust to a variety of uncertainty. This paper focuses on the benefits and limitations associated with multivariable control design using noncollocated versus collocated sensors and actuators. We address the question of whether performance is restricted due to the noncollocation of the sensors and actuators or the uncertainty associated with modeling of the flexible structures. Control laws are formulated based on models of the system and evaluated analytically and experimentally. Results of implementation of these control laws on the Caltech flexible structure are presented.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Doyle, John C.0000-0002-1828-2486
Additional Information:© 1990 IEEE. Funding for this research was provided by the NASA Graduate Student Fellowship, Caltech President's Fund and the COFS Guest Investigator Program.
Funding AgencyGrant Number
NASA Graduate Student Research FellowshipUNSPECIFIED
Caltech President’s FundUNSPECIFIED
Record Number:CaltechAUTHORS:20190313-090053071
Persistent URL:
Official Citation:G. J. Balas and J. C. Doyle, "Collocated versus Non-collocated Multivariable Control for Flexible Structure," 1990 American Control Conference, San Diego, CA, USA, 1990, pp. 1923-1928. doi: 10.23919/ACC.1990.4791064
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93759
Deposited By: Tony Diaz
Deposited On:13 Mar 2019 16:30
Last Modified:16 Nov 2021 17:00

Repository Staff Only: item control page