Vibration Control and Manufacturing of Intelligibly Designed Axially Functionally Graded Cantilevered Macro/Micro-tubes

摘要

In the last decade, extensive attention is devoted to intelligibly designed materials of macro/micro-structures containing the fluid flow. In this study, intelligent control and vibrational stability of cantilevered fluid conveying macro/micro-tubes utilizing axially functionally graded (AFG) materials are considered. The governing equation of motion of the system is derived based on modified couple stress theory and then is discretized using Galerkin method. A detailed investigation is carried out to elaborate the influence of various parameters such as material properties, axial compressive load, and Pasternak foundation on the dynamical behavior of the system, all of which are influential in stability control of the structure. It is observed that by the intelligible selection of material gradation, the desired functionality of the fluid-conveying structure could be achieved. Furthermore, scrutinizing the stability map, it is elucidated that compared with uniform structures, the decrease of material gradient parameter leads to a more stable system for a wider range of mass ratios and as a result, the system’s instability could be properly controlled. The results of this study will hold a great promise for engineers and designers who try to intelligibly optimize and manufacture novel macro/micro-structure systems carrying fluid flow as core elements in various macro, micro, and nanosystems.