On the use of measured rotational degrees of freedom in structural dynamics modification

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This work discusses the utilization of experimentally measured rotational degrees-of-freedom for structural modification. The rotational degrees of freedom are measured via a dual beam laser vibrometer capable of measuring one translation (z) and two rotations (Θx, Θy) from a reflective surface on a vibrating object. Initially, measured rotational residues are used as a basis to examine the difficulty of estimating the rotational characteristics solely from measured translational data. The measured rotational data is then used as a database for the Structural Dynamics Modification (SDM) of a structure with a beam type element. First a complete experimental modal analysis of a cantilever beam is performed extracting both translational and rotational modal parameters. An analytical SDM is then performed with the experimental modal data base to fix the free beam end. The resulting SDM modal parameters are compared to those determined from an experimental modal analysis of another beam with dual fixed-fixed boundary conditions. The comparison shows excellent correlation.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Pages96-101
Number of pages6
Editionpt 1
ISBN (Print)0912053410
StatePublished - Dec 1 1993
EventProceedings of the 11th International Modal Analysis Conference. Part 1 (of 2) - Kissimmee, FL, USA
Duration: Feb 1 1993Feb 4 1993

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Numberpt 1
Volume1923
ISSN (Print)0277-786X

Other

OtherProceedings of the 11th International Modal Analysis Conference. Part 1 (of 2)
CityKissimmee, FL, USA
Period2/1/932/4/93

Fingerprint

Structural dynamics
Degrees of freedom (mechanics)
Modal analysis
Cantilever beams
Laser beams
Boundary conditions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Cafeo, J. A., Trethewey, M. W., & Sommer, H. J. (1993). On the use of measured rotational degrees of freedom in structural dynamics modification. In Proceedings of SPIE - The International Society for Optical Engineering (pt 1 ed., pp. 96-101). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1923, No. pt 1). Publ by Society of Photo-Optical Instrumentation Engineers.
Cafeo, J. A. ; Trethewey, M. W. ; Sommer, H. J. / On the use of measured rotational degrees of freedom in structural dynamics modification. Proceedings of SPIE - The International Society for Optical Engineering. pt 1. ed. Publ by Society of Photo-Optical Instrumentation Engineers, 1993. pp. 96-101 (Proceedings of SPIE - The International Society for Optical Engineering; pt 1).
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Cafeo, JA, Trethewey, MW & Sommer, HJ 1993, On the use of measured rotational degrees of freedom in structural dynamics modification. in Proceedings of SPIE - The International Society for Optical Engineering. pt 1 edn, Proceedings of SPIE - The International Society for Optical Engineering, no. pt 1, vol. 1923, Publ by Society of Photo-Optical Instrumentation Engineers, pp. 96-101, Proceedings of the 11th International Modal Analysis Conference. Part 1 (of 2), Kissimmee, FL, USA, 2/1/93.

On the use of measured rotational degrees of freedom in structural dynamics modification. / Cafeo, J. A.; Trethewey, M. W.; Sommer, H. J.

Proceedings of SPIE - The International Society for Optical Engineering. pt 1. ed. Publ by Society of Photo-Optical Instrumentation Engineers, 1993. p. 96-101 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1923, No. pt 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Cafeo JA, Trethewey MW, Sommer HJ. On the use of measured rotational degrees of freedom in structural dynamics modification. In Proceedings of SPIE - The International Society for Optical Engineering. pt 1 ed. Publ by Society of Photo-Optical Instrumentation Engineers. 1993. p. 96-101. (Proceedings of SPIE - The International Society for Optical Engineering; pt 1).