Identification of damping is an active area of research in structural dynamics. In one of the earliest works, Lancaster  proposed a method to identify the viscous damping matrix from measured natural frequencies and mode shapes. His method requires the modes to be normalized in a particular way, which in turn a priori needs the very same viscous damping matrix. A method, based on the poles and residues of the measured transfer functions, has been proposed to overcome this basic difficulty associated with Lancaster’s method. This approach is then extended to a class of nonviscously damped systems where the damping forces depend on the past history of the velocities via convolution integrals over some kernel functions. Suitable numerical examples are given to illustrate the modified Lancaster’s method developed here.
Lancaster’s Method of Damping Identification Revisited
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received December 2000; Revised April 2002. Associate Editor: C. Farrar.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Adhikari, S. (September 20, 2002). "Lancaster’s Method of Damping Identification Revisited ." ASME. J. Vib. Acoust. October 2002; 124(4): 617–627. https://doi.org/10.1115/1.1500742
Download citation file:
- Ris (Zotero)
- Reference Manager