Title

Parameter Estimation Of A Variable Mass And Stiffness System Using Complex Mode Indicator Function

Abstract

This paper aims to investigate the dynamic properties of a cantilever type, variable length structure that will be referred to as "lift system". This structure is constructed for several applications, such as carrying sensors, camera systems, antennas, radars and people. The motivation for this study is that one of these lift systems failed during operation. One of the possible causes of the failure was considered to be the wind loading. Since these types of lift systems are widely used in Florida, the dynamic effect of wind loading should be exclusively considered. As it is known, the dynamic effect of the wind loading (as the other dynamic loadings) on the structure considerably changes for different configurations. Therefore, a set of dynamic tests are conducted to identify the modal parameters of the lift system for different lengths under different loads, and the results are compared to the counterparts from finite element and numerical models. Another interesting part of this structure is that its dynamic properties (not only the natural frequencies but also damping ratios) change because of varying length and payload as well as its cross-section. Therefore, the damping ratios for different cases are identified since the structure has a distinct damping characteristic and it is mainly the only parameter, which directly affects the amplification of the displacement at resonance. Finally, the implications of the results and the possible future modifications for an intelligent lift system are discussed.

Publication Date

12-1-2006

Publication Title

Conference Proceedings of the Society for Experimental Mechanics Series

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84861559433 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84861559433

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