Abstract
Structural dynamic modification techniques attempt to reduce dynamic design time and can be implemented beginning with spatial models of structures, dynamic test data or updated models. The models assumed in this discussion are mathematical models, namely mass, stiffness, and damping matrices of the equations of motion of a structure. These models are identified/ extracted from dynamic test data viz. frequency response functions (FRFs). Alternatively these models could have been obtained by adjusting or updating the finite element model of the structure in the light of the test data. The methods of structural modification for getting desired dynamic characteristics by using modifiers namely mass, beams and tuned absorbers are discussed.
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References
Baldwin J F, Hutton S G 1985 Natural modes of modified structures.AIAA J. 23: 1737–1743
Berman A 1975 Determining structural parameters from dynamic testing.Shock Vibr. Dig. 7: 10–17
Brandon J A 1990Strategies for structural dynamic modification (New York: John Wiley)
Craig R R Jr 1985 A review of time-domain and frequency-domain component mode synthesis methods.ASME: Combined Exp./Anal. Model. Dyn. Syst. AMD-67: 1–30
Ewins D J 1984Modal testing: Theory and practice (Somerset: Research Studies Press)
Fox R L, Kapoor M P 1968 Rates of change of eigenvalues and eigenvectors.AIAA J. 6: 2426–2429
Imergun M, Visser W J 1991 A review of model updating techniques.Shock Vibr. Dig. 23: 9–20
Kundra T K 1986Studies in identification and modification of dynamic mechanical systems. PhD thesis, Indian Institute of Technology, Delhi
Kundra T K, Nakra B C 1987 Structural modification with a tuned absorber attached to a complex structure via identified models.ASME: Modal Testing Anal. DE-3: 37–42
Kundra T K, Nakra B C 1994 Influence of dynamic test errors on system identification and modification.J. Inst. Eng. (India) 75: 14–18
Luk Y W, Mitchell L D 1984 Implementation of the dual space structural modification method.Proc. 2nd Int. Modal Analysis Conference (Orlando) 2: 930–936
Natke H G (ed.) 1982Identification of vibrating structures (New York: Springer Verlag, Wein)
Rao S S 1989 Optimum design of structures under shock and vibration environment.Shock Vibr. Dig. 21(7):
Ravi S S A 1994Structural dynamic modifications and design sensitivity analysis of structures with viscoelastic damping treatment. Ph D thesis, Indian Institute of Technology, Delhi
Ravi S S A, Kundra T K, Nakra B C 1994 Eigenvalue reanalysis of sandwich beams with viscoelastic core using perturbation method.Modal Anal.: Int. J. Anal. Exp. Modal Anal. 9: 203–217
Ravi S S A, Kundra T K, Nakra B C 1995a A response reanalysis of damped beams using eigenparameter perturbation.J. Sound Vibr. 179: 399–412
Ravi S S A, Kundra T K, Nakra B C 1995b A response reanalysis of damped complex beam structures.Proc. Int. Modal Analysis Conference (IMAC-XII) (Tennessee)
Sestieri A, D’Ambrogio W 1989 A modification method for vibration control of structures.Mech. Syst. Signal Process. 3: 229–253
Sharma K 1993Dynamic improvement by structural dynamic modifications. M Tech thesis, Indian Institute of Technology, Delhi
Shen S, Stevens K K 1989 A perturbation method for the analysis of structural systems.Proc. of DAMPING-89 (Florida) pp 1–16
Snyder V W 1985 Structural modification and modal analysis.Exp. Tech. 9: 245–315
Srivastava R K 1990Modal identification and optimal modification of systems via dynamic stiffness and sensitivity analysis. Ph D thesis, Indian Institute of Technology, Delhi
Srivastava R K, Kundra T K 1993 Structural dynamic modification with damped beam elements.Comput. Struct. 48: 943–950
Srivastava R K, Kundra T K 1995 Optimal modification of dynamic systems with a natural frequency constraint.Proc. Int. Modal Analysis Conference (IMAC-XII) (Tennessee)
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Kundra, T.K. Structural dynamic modifications via models. Sadhana 25, 261–276 (2000). https://doi.org/10.1007/BF02703544
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DOI: https://doi.org/10.1007/BF02703544