Fluid-Induced Nonlinear Vibration of a Cantilevered Microtube with Symmetric Motion Constraints

Abstract EN

This paper investigates the dynamic behavior of a cantilevered microtube conveying fluid, undergoing large motions and subjected to motion-limiting constraints.

Based on the modified couple stress theory and the von Kármán relationship, the strain energy of the microtube can be deduced and then the governing equation of motion is derived by using the Hamilton principle.

The Galerkin method is applied to produce a set of ordinary differential equations.

The effect of the internal material length scale parameter on the critical flow velocity is investigated.

By using the projection method, the Hopf bifurcation is demonstrated.

The results show that size effect on the vibration properties is significant.