Title page for ETD etd-02022007-133641


Type of Document Dissertation
Author Archibald, Charles Mark
URN etd-02022007-133641
Title Parametric spatial modal analysis of beams
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Robertshaw, Harry H. Committee Chair
Wicks, Alfred L. Committee Chair
Foutz, Robert Committee Member
Mitchell, Larry D. Committee Member
Pierce, Felix J. Committee Member
West, Robert L. Jr. Committee Member
Keywords
  • Modal analysis
  • Girders Mathematical models
  • Girders Testing
Date of Defense 1993-07-04
Availability restricted
Abstract

Modal analysis is the expermental characterization of the dynanlical behavior of a structure. Recent advances in laser velocimetery have made available to the experimentalist a rich, new source of vibration data. Data can now be obtained from many different spatial locations on a structure. A method is presented to use this new data for the analysis of beams. Two approaches are investigated: minimum residual methods and boundary condition methods. The minimum residual approaches include autoregressive methods and non-linear least squares techniques. Significant contributions to sample rate considerations for parametric sinusoidal estimation resulted from this research. The minimum residual methods provide a good connection between the measured data and the fitted model. However, they do not yield a true modal decomposition of the spatial data. The boundary condition approach provides a complete modal model that is based on the spatial data and is completely compatible with classical beam theory. All theoretical constraints are included in the procedure. Monte Carlo investigations describe the statistical characteristics of the methods. Experiments using beams validate the methods presented. Advantages and limitations of each approach are discussed.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V856_1993.A724.pdf 9.32 Mb 00:43:09 00:22:11 00:19:25 00:09:42 00:00:49
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.