Synthetic modifications in the frequency domain for finite element model update and damage detection
Konze, Ryun J.C.
Gordis, Joshua H.
Kwon, Young W.
MetadataShow full item record
Sensitivity-based finite element model updating and structural damage detection has been limited by the number of modes available in a vibration test and also by the corresponding amount of natural frequency sensitivity data. The method of Artificial Boundary Conditions (ABC) has been shown to greatly increase the number of modes and corresponding sensitivity data by artificially constraining the structure under test, producing a large number of alternative test configurations and associated sensitivity data. This thesis explores an extension of this concept by the application of synthetic structural modifications to the measured data, including both springs-to-ground and mass modifications. This is accomplished with frequency domain structural synthesis. The ability of this technique to generate additional sensitivity data for use in model update and damage detection is explored and compared with the use of Artificial Boundary Conditions. Frequency response functions from a simulated damaged structure are used as well as measured frequency response functions from a lab-scale damaged structure.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Ashton, Robert W.; Knauff, Michael C.; Dafis, Chris J. (2017);Generally, drive manufacturers include input filters and/or output filters to meet system requirements. Depending on damping, these filters have the potential to introduce ...
Farren, Merritt C.; Phillips, Charles A. (Monterey, California: U.S. Naval Postgraduate School, 1960);Sampled-data control systems generally have fixed sampling frequencies which must be set high enough to give satisfactory performance for all anticipated conditions, A study is made here of an adaptive system which ...
Brydges, Bruce E. (Monterey, California. Naval Postgraduate School, 1989-09);Stroboscopic schlieren photography was used to investigate the efFects of compressibihty, reduced frequency, and amphtude on the dynamic stall of a NACA 0012 airfoil subjected to sinusoidal oscillation. The Mach number ...