Dynamics modeling and cooperative control of multiple piezoelectric actuators for high-precision applications

在过去的二十年中，压电结构在高精度应用中的应用迅速增加。然而，压电材料固有的非线性限制了其应用范围，并提出了一个有趣的控制挑战。当一个系统中包含多个压电致动器时，这个问题变得更具挑战性。为了继承压电作动器的优点，重要的是要通过一定的建模和控制方法来最小化甚至消除压电作动器的非线性，如迟滞、蠕变、动力学效应和漂移。该项目旨在为高精度应用的多压电致动器动力学建模和协同控制器设计等关键技术做出基础性贡献。这是申请人之前的探索研究的自然延续。

The past two decades have seen a rapid increase in the use of piezoelectric structures in high-precision applications. However, the inherent nonlinearities of piezoelectric materials hinder the scope of the application and present an interesting control challenge. This issue gets more challenging when multiple piezoelectric actuators are involved in a system. To inherit the advantages offered by the piezoelectric actuators, it is important that the nonlinearities of piezoelectric actuators such as hysteresis, creep, dynamics effects and drfits are minimized or even eliminated using certain modelling and control approaches. This Discovery project aims to make fundamental contributions to the key technologies of dynamics modeling and cooperative controller design of multiple piezoelectric actuators for high-precision applications. It is a natural sequel to the applicant's previous Discovery research. This research will lead to the successful development of high-fidelity dynamics models capable of capturing most of the nonlinearities of piezoelectric actuators. The high-fidelity models will allow the successful inverse compensation of nonlinearities and the use of simple controllers to achieve satisfactory control performance. This research will also lead to the development of effective cooperative controllers for multiple piezoelectric actuators. This will enable the high-precision applications using multiple piezoelectric actuators, for example Fabry-Perot spectrometer and fast steering mirrors. Another topic that will be investigated through this project is the integrated mechanical and control system design approach, which can lead to a better piezo-driven system. This research will also create a unique vibrant multidisciplinary learning and training environment for highly qualified personnel (HQP) and will support the HQP training in many ways. All HQP involved in this research will be trained in both theoretical and hands-on aspects. The HQP equipped with such unique research abilities are sought after by Canadian research community and industry.