Gravity-Actuator System for Control of Civil Structures
Publication: Journal of Structural Engineering
Volume 123, Issue 1
Abstract
Many of the active devices currently being researched for seismic structural control applications are highly energy intensive. This presents a serious concern for active control since adequate energy sources may not be available during an earthquake. To alleviate this concern, an innovative gravity-actuator control system is proposed herein. This control system minimizes the external energy demand by using the reserve kinetic energy stored in suspended active masses to generate lateral forces for control. An idealized model of the gravity-actuator system is analyzed in detail, and equations governing the dynamic response of this model are derived. An algorithm that uses short-duration force pulses to attenuate the structural response is developed for operation of this control system. Numerical examples considering the response of a seismically excited model structure are presented to assess the performance of the control system and the pulse-control algorithm. Results demonstrate that the gravity-actuator control system is capable of significantly reducing the lateral vibrations of the structure, thereby indicating the proposed control concept to be worthy of continued study.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Adbel-Rohman, M., and Leipholz, H. H.(1983). “Active control of tall buildings.”J. Struct. Engrg., ASCE, 109(3), 628–645.
2.
Dehghanyar, T. J., Masri, S. F., Miller, R. K., and Caughey, T. K. (1987). “On-line parameter control of nonlinear flexible structures.”Struct. Control: Proc., of the 2nd Int. Symp. on Struct. Control, Martinus Nijhoff Publishing, Amsterdam, The Netherlands, 141–159.
3.
Ghaboussi, J., and Paul, S. L. (1992). “A new method of structural control using suspended weights.”Proposal to the Res. Board, Univ. of Illinois at Urbana-Champaign, Urbana, Ill.
4.
Masri, S. F., Bekey, G. A., and Safford, F. B.(1975). “Optimum response simulation of multidegree systems by pulse excitation.”J. Dyn. Sys., Measurement, and Control, 97, 46–52.
5.
Masri, S. F., Bekey, G. A., and Udwadia, F. E. (1980). “On-line pulse control of tall buildings.”Struct. Control: Proc., of the Int. IUTAM Symp. on Struct. Control, North Holland Publishing, Amsterdam, The Netherlands, 471–491.
6.
Masri, S. F., Bekey, G. A., and Caughey, T. K.(1981). “Optimum pulse control of flexible structures.”J. Appl. Mech., 48, 619–626.
7.
Masri, S. F., Bekey, G. A., and Caughey, T. K.(1982). “On-line control of nonlinear flexible structures.”J. Appl. Mech., 49, 877–884.
8.
Miller, R. K., Masri, S. F., Dehghanyar, T. J., and Caughey, T. K.(1988). “Active vibration control of large civil structures.”J. Engrg. Mech., ASCE, 114(9), 1542–1570.
9.
Prucz, Z., Soong, T. T., and Reinhorn, A.(1985). “An analysis of pulse control for simple mechanical systems.”J. Dyn. Sys., Measurement, and Control, 107, 123–131.
10.
Soong, T. T. (1990). Active structural control: theory and practice. Longman Scientific and Technical, Essex, England.
11.
Soong, T. T., Reinhorn, A. M., and Yang, J. N. (1987). “A standardized model for structural control experiments and some experimental results.”Struct. Control: Proc., of the 2nd Int. Symp. on Struct. Control, Martinus Nijhoff Publishing, Amsterdam, The Netherlands, 669–693.
12.
Tomasula, D. P., and Ghaboussi, J. (1994). “Gravity actuators in structural control.”Proc., of the 1st World Conf. on Struct. Control, International Association for Structural Control, Los Angeles, Calif., Vol. 2, TA1:50–TA1:59.
13.
Udwadia, F. E., and Tabaie, S.(1981a). “Pulse control of single-degree-of-freedom system.”J. Engrg. Mech. Div., ASCE, 107(6), 997–1009.
14.
Udwadia, F. E., and Tabaie, S.(1981b). “Pulse control of structural and mechanical systems.”J. Engrg. Mech. Div., ASCE, 107(6), 1011–1028.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 123 • Issue 1 • January 1997
Pages: 42 - 51
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jan 1, 1997
Published in print: Jan 1997
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.