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The research was to further improve the automation level and packaging accuracy of feed crushing machinery. The study designed an intelligent control and online monitoring platform for feed crushing system based on LabVIEW and PLC. Regarding the structure and process flow of feed crushing machinery, the hardware and software design of control system were completed using PLC as core controller. LabVIEW was an upper computer that achieves centralized control and data monitoring. Propose a control mode that can adapt to system to improve packaging accuracy. The results showed that the intelligent control and online monitoring platform of feed crushing system could operate smoothly, improve the platform's data collection and on-site application capabilities, the control mode that improved packaging accuracy had a significant effect, with an accuracy controlled within 0.5%. The study indicates that the research can provide reference for the design of feed crushing machinery control system. [ABSTRACT FROM AUTHOR]

Spindle rotation error affects the machining accuracy of turning workpieces. Through analyses and studies of the spindle rotation error， a 2-D surface topography detection method was proposed for turning workpieces based on the rotation error， and the turning process model was established. The MATLAB simulation results showed that the spindle radial rotation error affects the turning radius and surface topography of the workpiece， resulting in the coaxiality error， roundness error and surface roughness. To verify the effectiveness of the proposed method， the 2-D surface topography detection platform for data collection was built， and the rotation error value of the spindle in the depth direction and average radius error of turning workpieces were obtained. The experimental results showed that the experiment and simulation results are consistent in characteristics， which verify the feasibility of the method and have reference value for the performance debugging of the machine tool and improving the processing quality of the workpieces. [ABSTRACT FROM AUTHOR]