A new reformulation of vibration suppression equations of functionally graded magnetorheological fluid sandwich beam

Abstract

• Vibration suppression analysis of a FGMRF sandwich beam is analyzed. • A new decoupling approach is employed to exactly solve the problem. • Complex shear modulus of the MRF depend only severely upon the magnetic field. • Effects of various parameters on the modal parameters are considered. This article presented a new reformulation of governing equations of functionally graded magnetorheological fluid (FGMRF) sandwich beams using new auxiliary functions. This technique led to the decoupled vibration equations of the FGMRF sandwich beams and also to the analytical solutions for the in-plane and out of plane displacement fields by considering the Euler-Bernoulli beam theory (EBBT). The material properties of top and bottom layers were changed through the layer thickness according to a power-law distribution of the volume fraction of the constituents. Complex shear modulus of the magnetorheological fluid was varied continuously as a quadratic function of magnetic field intensity. Natural frequencies and corresponding loss factors were calculated with high accuracy in comparison with those available in literature. The effects of boundary conditions, geometric and material properties and the magnetic field intensity on vibrational modes were investigated. Results revealed that unlike the natural frequencies, the loss factors were more affected by the magnetic field.