Research On Simulation And Experiment Based On Piezoelectric Smart Structure

Piezoelectric smart structures use piezoelectric materials as actuators. That because piezoelectric material has the advantages of fast response and stable performance and so on. Piezoelectric smart structure is widely used in aerospace industry. Interdigitated electrode piezoelectric fiber composite has the performance of piezoelectric ceramics. In addition, it makes full use of the advantages of high piezoelectric constant d33, which increases anisotropy., so piezoelectric fiber composite has been widely used in smart structures. In this paper, we apply piezoelectric fiber composite actuator to piezoelectric cantilever beam and wing-box structure, and do finite element simulation and experiment. Due to electrode size and structure size is not in the same order of magnitude, the finite element model is complex so that it is not simulation. While the response of piezoelectric smart structures is Hysteresis, which block it's practical application. The main jobs are as follow:First, based on the analogy between the equation of inverse piezoelectric effect and piezoelectric strain decomposition, the driving voltage is simulated for mechanical load. In addition, I proposed stress simulation method of piezoelectric actuators, and it is employed to the static displacement of piezoelectric cantilever beam including 0-degree ply and 45-degree ply.Second, according to the experimental purpose, I designed experimental platform of piezoelectric smart structures, including software and hardware design. Then, I took advantage of the experimental platform to study the performance of piezoelectric fiber composites. A modified coefficient is needed to reduce the influence of hysteresis performance of piezoelectric fiber composites to simulation results. Furthermore, I studied the voltage amplitude, the voltage hold time, the voltage increase of the interval and the sinusoidal signal frequency to influence of hysteresis performance of piezoelectric fiber composites.Finally, the corrected stress simulation method of piezoelectric actuators is applied to wing-box including static and dynamic analysis. Dynamic analysis used Newmark-βmethod, obtained hysteresis curve under different voltage signal, and compared with experimental results. Furthermore, we study the voltage amplitude, the voltage hold time, the voltage increase of the interval and the sinusoidal signal frequency to influence of hysteresis performance of wing-box.