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With the crisis of energy becoming more severity, the research of cutting down the drag of commercial vehicles is more and more important. In this work, to reduce the drag of a van body truck, aerodynamic drag reduction designs are carried out by the method of numerical simulation to lay a foundation for the digital manufacturing technology of van body(More)
A positioning system is established and tested for meso machine tools. The design aims to develop practical microscale machine tools, improve the capability in difficult-to-machine material processing, resolve the contradiction between small size and high torque output. In order to maintain a mini volume and in terms of nowadays technology, ball screw(More)
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