Dynamic Scaling of Flexible Structures With Viscoelastic Components

[+] Author and Article Information
Thomas E. Alberts, Houchun Xia, Yung Chen

Department of Mechanical Engineering and Mechanics, Old Dominion University, Norfolk, VA 23529–0247

J. Vib. Acoust 114(4), 449-453 (Oct 01, 1992) (5 pages) doi:10.1115/1.2930283 History: Received March 01, 1991; Revised October 01, 1991; Online June 17, 2008


Laboratory dynamic testing of large and complex space structures can be difficult and expensive, if practical at all. The use of dynamically scaled test articles is a standard approach to laboratory testing which helps to avoid these problems. The theory and practice of dynamic scaling for elastic structures are well established and validated; however, the issue of scaling structures with viscoelastic components has not been thoroughly investigated. In a structure that is “replica scaled” by a factor 1/λ, the natural frequencies are each scaled by a factor λ. For proper dynamic scaling, each corresponding damping ratio should be unchanged from that of the original full scale structure. The difficulty that arises with structures incorporating viscoelastic components is that the viscoelastic material properties vary with frequency in a nonlinear fashion. Thus, for a particular mode of a scaled model, the viscoelastic material’s damping properties are evaluated at a frequency which is modified by a factor 1/λ and as a consequence the damping ratio does not scale properly. To solve this problem, the authors propose taking advantage of the temperature dependence of viscoelastic material properties. By appropriately controlling the experimental temperature of the scaled structure, it is possible to obtain accurate dynamic scaling results. In this paper, the proposed frequency-temperature compensation method of dynamic scaling for viscoelastically damped structures is developed and experimentally validated.

Copyright © 1992 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In