Nonlinear Dynamic Characteristics and Optimal Control of SMA Composite Wings Subjected to Stochastic Excitation

الملخص EN

A kind of high-aspect-ratio shape memory alloy (SMA) composite wing is proposed to reduce the wing’s fluttering.

The nonlinear dynamic characteristics and optimal control of the SMA composite wings subjected to in-plane stochastic excitation are investigated where the great bending under the flight loads is considered.

The stochastic stability of the system is analyzed, and the system’s response is obtained.

The conditions of stochastic Hopf bifurcation are determined, and the probability density of the first-passage time is obtained.

Finally, the optimal control strategy is proposed.

Numerical simulation shows that the stability of the system varies with bifurcation parameters, and stochastic Hopf bifurcation appears in the process; the reliability of the system is improved through optimal control, and the first-passage time is delayed.

Finally, the effects of the control strategy are proved by experiments.

The results of this paper are helpful for engineering applications of SMA.