基于分布柔度式平面柔順機構(gòu)的微定位平臺研究
[Abstract]:Precision positioning technology is a strategic choice to enhance national core competitiveness and comprehensive national strength, and the control system design of micro-positioning platform is the key part of precision positioning technology. As a new type of micro-positioning mechanism, the distributed flexibility planar compliant mechanism not only has the advantages of no friction and wear, no movement clearance and no assembly lubrication, but also has multiple kinematic dimensions of parallel mechanism. High stability and high bearing capacity. The micro-positioning platform based on distributed flexibility planar compliant mechanism has high motion accuracy, large stroke, fast dynamic response, small volume, and can achieve sub-micron positioning accuracy and nanoscale resolution. Therefore, the distributed flexibility planar compliant mechanism can be widely used in the fields of precision engineering, micro / nano manufacturing, microelectronics technology and so on. The analysis of its motion characteristics and the design of its control system have become the focus of attention of scholars at home and abroad. In this paper, the kinematic and dynamic characteristics of the distributed compliance planar compliant mechanism are discussed, and the design of the controller and the establishment of the control system are analyzed. Finally, the correctness of mechanism modeling and theoretical analysis is verified by experimental test. The specific research contents are as follows: (1) based on the vector isomorphism model of the distributed compliance planar compliant mechanism, the kinematics analysis of the mechanism is carried out by using the micro-displacement method, and the input and output Jacobian matrix of the mechanism is obtained. The displacement / rotation cloud diagram and stress cloud diagram of the mechanism are obtained by simulation. The kinematic characteristics of the mechanism and the validity of the Jacobian matrix are verified. (2) the Lagrangian equation (Lagrange method) is used. The rigid-body dynamics model of the planar compliant mechanism with distributed flexibility is established. Based on the beam element model and the principle of kinematic elastodynamics (KED method), the elastic dynamic model of the distributed flexibility planar compliant mechanism is established. On this basis, the modal analysis of the mechanism is carried out, and the third order natural frequency and mode diagram of the mechanism are obtained, which verifies the validity of the dynamic model of the mechanism. (3) based on the elastic dynamics equation and filter of the distributed compliance type planar compliant mechanism, A sliding mode variable structure controller (SMC),) is designed and the Lyapunov (Lyapunov) function is constructed to prove the stability of the controller. Combined with S-Function function and Simulink block diagram, the control system of the mechanism is established. Through simulation, the displacement trajectory tracking curve and its error curve of the mechanism are obtained. (4) the experimental data of the distributed flexibility planar compliant mechanism are obtained in three aspects: output coupling, positioning accuracy and motion track. Compared with the theoretical calculation, the reason of the data error is analyzed, and the correctness of the mechanism theory analysis is verified.
【學位授予單位】:江西理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TH112
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