Parameters estimation of sandwich beam model with rigid polyurethane foam core

In this work, the physical parameters of sandwich beams made with the association of hot-rolled steel, Polyurethane rigid foam and High Impact Polystyrene, used for the assembly of household refrigerators and food freezers are estimated using measured and numeric frequency response functions (FRFs). The mathematical models are obtained using the finite element method (FEM) and the Timoshenko beam theory. The physical parameters are estimated using the amplitude correlation coefficient and genetic algorithm (GA). The experimental data are obtained using the impact hammer and four accelerometers displaced along the sample (cantilevered beam). The parameters estimated are Young's modulus and the loss factor of the Polyurethane rigid foam and the High Impact Polystyrene.

[1]  Vibration and dynamic stability of a traveling sandwich beam , 2005 .

[2]  Alessandro Gasparetto,et al.  An experimental technique for complete dynamic characterization of a viscoelastic material , 2004 .

[3]  Anders Nilsson,et al.  Modelling the vibration of sandwich beams using frequency-dependent parameters , 2007 .

[4]  Rajendra Singh,et al.  Estimation of the dynamical properties of polyurethane foam through use of Prony series , 2003 .

[5]  K. Ahmed.  Dynamic analysis of sandwich beams , 1972 .

[6]  Wei-Der Chang,et al.  An improved real-coded genetic algorithm for parameters estimation of nonlinear systems , 2006 .

[7]  T. Ohkami,et al.  Parameter identification of viscoelastic materials , 1999 .

[8]  Yves Rolain,et al.  Identification of Young's modulus from broadband modal analysis experiments , 2004 .

[9]  Junhong Park,et al.  Transfer function methods to measure dynamic mechanical properties of complex structures , 2005 .

[10]  Hugo Sol,et al.  Material parameter identification of sandwich beams by an inverse method , 2006 .

[11]  James N. Siddall,et al.  Optimal Engineering Design: Principles and Applications , 1982 .

[12]  Nuno M. M. Maia,et al.  Theoretical and Experimental Modal Analysis , 1997 .

[13]  T. Sakiyama,et al.  FREE VIBRATION ANALYSIS OF SANDWICH BEAM WITH ELASTIC OR VISCOELASTIC CORE BY APPLYING THE DISCRETE GREEN FUNCTION , 1996 .

[14]  D. J. Mead,et al.  The forced vibration of a three-layer, damped sandwich beam with arbitrary boundary conditions , 1969 .

[15]  Kevin L. Kreider,et al.  Parameter identification for nonlinear elastic and viscoelastic plates , 2006 .

[16]  R. Cook,et al.  Concepts and Applications of Finite Element Analysis , 1974 .