Research On Two-Dimensional Image Stabilization Mechanism Based On Piezoelectric Driving

Collecting high-definition images is the main purpose of image stabilization technology.In order to improve the displacement resolution,fast response and anti-jamming performance of image stabilization platform,piezoelectric actuator is applied to optical image stabilization system,which can improve the positioning accuracy and response speed of the whole system,and lead the image stabilization equipment towards lightweight and intelligent.In this paper,according to the principle of lever-half bridge hybrid amplification,a two-dimensional image stabilization mechanism based on piezoelectric driving was designed.The mechanism was applied to the compensation of the front image motion of aerial cameras to achieve the goal of image stabilization.The main studies are as follows.The basic characteristics of piezoelectric materials and piezoelectric stacks were described.Based on UG,a two-dimensional image stabilization mechanism driven by piezoelectric stack was designed by using the theoretical model of lever-half bridge hybrid amplification mechanism.Based on the finite element method,the stiffness model of two-dimensional image stabilization mechanism was established,and the stiffness calculation formula was deduced.The input stiffness is 105 N/mm,and the output stiffness is 9.5 N/mm.The results show that the stiffness of the first lever is large,and the output of the piezoelectric stack is stable;the output stiffness of the half bridge mechanism is small,which is conducive to the realization of the large stroke of the image stabilization platform.Based on the kinetic energy and potential energy theorem,the natural frequency of the mechanism are calculated to be 160 Hz,which is different from the working frequency.It is proved that the mechanism has anti-interference ability.Based on the three-dimensional model of the two-dimensional image stabilizing mechanism,the static and dynamic simulation analysis of the mechanism were carried out by using ANSYS Workbench.The simulation results show that the two-dimensional image stabilization mechanism can realize the function of micro-displacement positioning in X and Y directions,and further verifies that resonance does not occur when the mechanism works.Based on the multi-objective parameter optimization design,the parameter optimization design of the right-angle flexible hinge was carried out by using the Design Exploration module.It is verified that the parameter design of right angle flexure hinge is reasonable.Based on the principle of optical image stabilization,an optical image stabilization system for aerial camera front image motion compensation was designed,and the PID control model was established.The system was simulated by using MATLAB.The simulation results show that the whole system tends to be stable after 0.01 s and can achieve the goal of image stabilization.The experimental study of two-dimensional image stabilization mechanism was carried out.The results show that when the input voltage is 150 V,the output displacements in X and Y directions are 103.9μm and 104.8 μm,respectively;in low frequency environment,the output displacement of X and Y direction are 1.2μm and 1.5 μm,respectively;the maximum output displacement coupling in the X and Y directions are 7.3μm and 6.2 μm,respectively,which do not exceed 7.5%of the stroke.According to the requirement of optical image stabilization technology,a piezoelectric two-dimensional image stabilization mechanism is designed.The feasibility of this mechanism in the compensation of aerial camera front image motion is verified,which provides an effective theoretical basis for the experimental study of optical image stabilization system.