Finite Element Analysis and Vibration Control of a Deep Composite Cylindrical Shell Using MFC Actuators

Abstract

A four-node composite facet-shell element is developed, accounting for electromechanical coupling of Macrofiber Composite (MFC) and conventional PZT patches. Further a warping correction is included in order to capture correctly the induced strain of conformable MFC, surface bonded on a cylindrical shell. The element performance to model the relations between in-plane electric field to normal strains is examined with the help of experiment and ANSYS analysis. In ANSYS, a simple modeling scheme is proposed for MFC using a parallel capacitors concept. The independent modal space control technique has been revisited to address the control of combination resonances through a selective modal space control scheme, where two or more modes can be combined to form the vibrating system or plant in modal domain. The developed control schemes are implemented in a digital processor using DS1104 and the closed-loop vibration control experiments are conducted on a CFRP shell structure. The influence of directionally induced actuation of MFC actuators on elastic couplings of composite shell is studied theoretically and is subsequently demonstrated in experiments. MFC actuators provide the much needed optimization domain for achieving the vibration control of combination resonances of elastically coupled deep-shell structure.

Active Vibration Control of Composite Structures Using MicroBlaze™ Soft Core Processor on Virtex-4 FPGA

“…The experimental rig, with the Shell structure, is shown in figure 10(a). The placement of the MFCs, are as shown in the figure & was optimized as part of a separate study by Dr. Raja & group [46,47]. The fixing conditions for our testing were not the same as that used in the studies by Dr. Raja.…”

Coupled efficient layerwise finite element modeling for active vibration control of smart composite and sandwich shallow shells

“…Kulkarni and Bajoria (2003) presented a doubly curved degenerate shell element based on a higher order theory (HOT) including electric potential DOF, and applied it to vibration control of laminated cylindrical shells. Recently, a four-node facet shell element based on the coupled FSDT has been employed for the vibration control study of composite cylindrical shells with macro fiber composite (MFC) actuators (Kumar et al, 2012).…”