Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Structural Integrity Assessment Using Laser Measured Surface Vibration
This SERDP SEED Project was focused on extending the applicability of the NRL-developed structural acoustic fault monitoring technique using laser measured surface vibration to the materials and fabrics associated with historic buildings. In this regard, flexural wave inversion was successfully demonstrated numerically on thin plates of plaster, steel, and concrete and on thick plaster and steel plates with flaws at different depths. A new orthotropic inversion algorithm was developed and demonstrated on a similarly generated numerical data base on a wood slab. Two novel adaptive inversion approaches were developed and demonstrated, one using the flexural wave and generalized force algorithms sequentially, and the other based on high order equations of motion with unknown coefficients. A finite element-based study of a plaster dome ceiling with a detached section and a deconsolidated inclusion was carried out using acoustic speaker excitation. A model was developed for predicting flaw size detectability and for generalizing to other ceiling conditions. A new conformal spatial transform was developed and applied to the elliptical dome ceiling showing marked differences in the wave-number spectra associated with the two flaw types. Finally, a laboratory demonstration was carried out on a large wooden ceiling support beam in whose interior was created a small, thin cavity filled with sawdust.
Structural Integrity Assessment Using Laser Measured Surface Vibration
This SERDP SEED Project was focused on extending the applicability of the NRL-developed structural acoustic fault monitoring technique using laser measured surface vibration to the materials and fabrics associated with historic buildings. In this regard, flexural wave inversion was successfully demonstrated numerically on thin plates of plaster, steel, and concrete and on thick plaster and steel plates with flaws at different depths. A new orthotropic inversion algorithm was developed and demonstrated on a similarly generated numerical data base on a wood slab. Two novel adaptive inversion approaches were developed and demonstrated, one using the flexural wave and generalized force algorithms sequentially, and the other based on high order equations of motion with unknown coefficients. A finite element-based study of a plaster dome ceiling with a detached section and a deconsolidated inclusion was carried out using acoustic speaker excitation. A model was developed for predicting flaw size detectability and for generalizing to other ceiling conditions. A new conformal spatial transform was developed and applied to the elliptical dome ceiling showing marked differences in the wave-number spectra associated with the two flaw types. Finally, a laboratory demonstration was carried out on a large wooden ceiling support beam in whose interior was created a small, thin cavity filled with sawdust.
Structural Integrity Assessment Using Laser Measured Surface Vibration
J. A. Bucaro (Autor:in) / A. J. Romano (Autor:in) / S. Dey (Autor:in) / P. Herdic (Autor:in) / B. H. Houston (Autor:in)
2009
73 pages
Report
Keine Angabe
Englisch
Optics & Lasers , Environmental & Occupational Factors , Structural Analyses , Acoustic Detection , Lasers , Structural integrity , Vibration , Algorithms , Beams(Structural) , Buildings , Ceiling , Concrete , Depth , Doppler systems , Elastic properties , Equations of motion , Fault detection , Finite element analysis , Mapping , Plates , Steel , Vibrometers , Waves , Laser measured surface vibration , Scanning laser doppler vibrometers(SLDV) , Flexural wave inversion , Orthotropic inversion algorithms , Plaster dome ceilings , United States capitol building , Orthotropic inversion , Wooden slabs
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