Experimental determinations of the eigenmodes for composite bars made with carbon and Kevlar-carbon fibers

Modern Technologies in Industrial Engineering 2015

Mirioiu, C.M.^1 ; Stnescu, M.M.^2 ; Burada, C.O.^1 ; Bolcu, D.^1 ; Roca, V.^1

Faculty of Mechanics, University of Craiova, 165 Calea Bucuresti, Craiova

200620, Romania^1

Department of Applied Mathematics, University of Craiova, 13 AI Cuza, Craiova

200396, Romania^2

关键词: Eigen frequencies;    Excitation methods;    Excitation points;    Experimental determination;    Frequency response functions;    Modal identification;    Practical engineering;    Structure response;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/95/1/012005/pdf
DOI  :  10.1088/1757-899X/95/1/012005

来源: IOP

【 摘 要 】

For modal identification, the single-point excitation method has been widely used in modal tests and it consists in applying a force in a given point and recording the vibratory structure response in all interest points, including the excitation point. There will be presented the experimental recordings for the studied bars (with Kevlar-carbon or carbon fibers), the frequency response function in Cartesian and polar coordinates. By using the frequency response functions we determine the eigenparameters for each bar. We present the final panel of the eigenmodes (with the damping factors, eigenfrequencies and critical damping) for each considered bar. Using the eigenfrequency of the first determined eigenmode, the bars stiffness has been determined. The presented bars can be used in practical engineering for: car or bus body parts, planes body parts, bullet-proof vests, reinforcements for sandwich beams, and so on..