Taking the copper conductor vertical barrel as the research object, the process flow principle of the packaging system of the copper conductor vertical barrel is described, the mechanism that meets the positioning of the inner hole is proposed. The transmission and kinematics characteristics of the mechanism under different rod sizes are analyzed. The optimal size of the kinematic parameters of the mechanism is solved using the MATLAB optimization toolbox, the size of each member is determined for further determine the specifications and dimensions of the original moving parts to provide a basis for the selection of the original moving parts.
With the increasing demand of high-speed highprecision positioners in industrial applications, a novel highspeed high-precision xy-table based on error compensation is presented in the paper. According to the theory of yaw error compensation, four inductive sensors were used to measure the yaw error and a micro-table used to compensate the error while the macro-table moving in high speed mode. Based on theoretical calculation and finite element analysis, the micro-table based on piezoelectric actuator (PZT) driven was designed. The crosscoupling controller (CCC) took the whole system as the control target to reduce contour error. Experimental results proved that the contour accuracy of the xy-table was improved by applied the error compensation combined with CCC.
The Ti-Al alloy has good physical, chemical and mechanical properties, and it is the preferred material in aerospace and other special fields. The laser spots array is used for thermal excitation of the Ti-Al alloy specimen. Based on the fractional differential equation and Fourier heat conduction equation, the fractional heat transfer model of Ti-Al alloy plate specimen ex-cited by short pulse laser spots array is established, and the infrared thermal imaging simulation analysis is carried out by finite element method. The effects of crack width, crack depth and the distance between the crack and its nearest laser spot center on temperature abrupt jump is analyzed. With the increase of crack width and depth, the temperature abrupt jump increases, but the trend gradually slows down. The distance between the crack and its nearest laser spot center has a significant effect on the temperature abrupt jump. With the increase of the distance, the temperature abrupt jump first increases and then decreases. When the distance equals the laser spot radius, that is, the crack is tangent to the spot, the temperature abrupt jump reaches its maximum.
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