Engineering Transactions, 37, 4, pp. 675-691, 1989

Active Strategy of Avoiding Resonance

J. Hojnicki-Szulc
Institute of Fundamental Technological Research, Warszawa

The problem of active control of natural frequencies by changes of local stiffness in structural elements in order to avoid resonance (due to variable frequency of excitation) is considered, The optimal strategy of play with switchable control parameters in the case of a simple discrete structure and continuous beam cantilever is discussed. lt is concluded that even one structural element with a controllable stiffness coefficient gives us an efficient (in most cases) device to avoid resonance frequencies in the structure under variable excitation.

Full Text: PDF
Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).


M. J. BALAS, Direct output feedback control of large space structures, J. Astronaut. Sci., 27, pp. 157-180, April-June 1979.

A. L. HALE and R. J. LISOWSKI, Optimal simultaneous structural and control design of manoeuvring flexible spacecraft, Proceeding of Fourth VPI and SU/AIAA Symposium, Virginia Polytechnic Institute and State University, pp. 1-16, Blacksburg 1983.

R. T. HAFTKA, Z. N. MARTINOVIC and W. L. HALLAUER Jr., Enhanced vibration controllability by minor structural modifications, AIAA J., 23, 8, 1985.

J. HOLNICKI-SZULC, Damping of vibration by actively controlled virtual distortion, J. Aerospace Engineering, ASCE, April, 1990.

J. L. JUNKINS, D. S. BODDEN and J. D. TURNER, A unified approach to structure and control system design iterations, Paper presented at Fourth International Conference on Applied Numerical Modelling, Taipei, Taiwan, December 1984.

N. S. KHOT, V. B. VENKAYYA and F. E. EASTEP, Structural modification of large flexible structures to improve controllability, AIAA Paper, 84-1906, August 1984.

N. S. KNOT, V. B. VENKAYYA and F. E. EASTEP, Optimal structural modifications to enhance the active vibration control of flexible structures, AIAA J., 24, 8, pp. 1368-1374, 1986.

A. MESSAC, J. TURNER and K. SOOSAR, An integrated control and minimum mass structural optimization algorithm for large space structures, Paper presented at Jet Propulsion Workshop on Identification and Control of Flexible Space Structures, San Diego 1984.

W. NOWACKI, Structural dynamic, Arkady, Warsaw 1961 [in Polish].

L. D. PINSON, A. K.AMOS and V. B. VENKAYYA, (eds), Modelling, analysis and optimization issues for large space structures, Proceedings of NASA/AFOSR Workshop, May 1982.

J. ROORDA, Active damping in structures, Cranfield Report Aero 8, Cranfield Institute of Technology, Cranfield United Kingdom 1971.

J. ROORDA, Tendon control in tall structures, Journ. of the Struct. Div. ASCE, 101, ST3, pp. 505-521, March 1975.

M. SALAMA, M. HAMIDI and L. DEMSETZ, Optimization o coNtrolled structures, Paper presented at Jet Propulsion Workshop on Identification and Control of Flexible Space Structures, San Diego 1984.

V. B. VENKAYYA and V. A. TISCHLER, Frequency control and the effect on the dynamic response of flexible structures, AIAA Paper, 84--1004, May 1984.

J. T. P. YAO, Concept of structural control, presented at the April 19-23, 1971, ASCE National Structural Engineering Meeting, Baltimore 1971.

J. T. P. YAO and J. P. TANG, Active control of civil engineering structures, Technical Report, CE-STR 73-1, Purdue University, West Lafayette 1973.

W. ZUK, Kinetic structures, Civil Engineer. ASCE, 39, 12, pp. 62-64, 1968.

TIMOSHENKO, Vibration problems in engineering, New York 1928.