Experimental and numerical investigation of mode veering in a stressed structure

Jonathan L Du Bois, Sondipon Adhikari, Nick A. J. Lieven

Research output: Contribution to conferencePaper

Abstract

There have been extensive research works on the mode veering phenomenon in dynamic systems. As system eigenvalues vary with some parameters, their loci are often seen to converge on each other. Sometimes they will cross, continuing on the same trajectories, but in other cases they will be seen to veer away suddenly in a small region of the graph. Theoretical studies of this behaviour have been reported for almost forty years. Despite this, there has been very little reference to experimental results. Historically the phenomenon was often dismissed as an aberration caused by spatial discretisation. Although it can be artificially induced in this manner, exact analytical solutions have now reproduced this effect without the approximations of numerical models. In this paper a detailed analytical and numerical investigation on mode veering is reported. The parameter used is the internal pre-load of a redundant frame. Stress stiffening approximations are employed to obtain a tangent stiffness for a non-linear stat ic solution, which is then used in a linear dynamic analysis. Experimental results are given, showing when mode veering occurs and demonstrating the influence of damping. These are compared to the analytical results and practical implications and possible exploitations of the behaviour are discussed.
Original languageEnglish
Number of pages9
Publication statusPublished - 2007
EventIMAC XXV: Conference & Exposition on Structural Dynamics - Celebrating 25 Years of IMAC - Orlando, Florida, USA United States
Duration: 12 Feb 200722 Feb 2007

Conference

ConferenceIMAC XXV: Conference & Exposition on Structural Dynamics - Celebrating 25 Years of IMAC
CountryUSA United States
CityOrlando, Florida
Period12/02/0722/02/07

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    Du Bois, J. L., Adhikari, S., & Lieven, N. A. J. (2007). Experimental and numerical investigation of mode veering in a stressed structure. Paper presented at IMAC XXV: Conference & Exposition on Structural Dynamics - Celebrating 25 Years of IMAC, Orlando, Florida, USA United States.