Chengyu Li

New energy vehicles driven by electric motors have higher requirements for the lightweight and high reliability of their gear transmission devices. It is now necessary to optimize the precision forming process of their structural gears. The integrated structure gear without undercut produced by precision forming technology can reduce axial size while improving the strength and reliability of gear parts. Based on the performance requirements of integrated structural gear parts in practical applications, a process plan of "hot forging forming +cold trimming tooth shape" was developed, and compared with existing hot extrusion forming plans. Simulation analysis was conducted on the hot forging forming process of integrated structural gears. Through the improvement and optimization of the process plan, the extrusion stress during the filling process of the formed gear teeth was reduced by about 29%, achieving a good forming effect, in order to provide data reference for the forming of this type of gear.

With the rise of autonomous driving technology in recent years, millimeter wave radar has been more and more widely used in automobiles. In complex actual road conditions, the mutual interference between a large number of vehicle-mounted FMCW radars working in the same frequency band, as well as the existence of some human intentional or unintentional interference in special scenarios may make the target detection error. In this paper, based on the working mechanism of FMCW radar, the influence process of interference on the speed detection results is deduced, and a generalized interference analysis platform is proposed to do quantitative calculations on the influence of interference signals of different frequencies and intensities on speed detection. Through the research of this paper can be more in-depth understanding of the role of interference on the target judgment mechanism, for radar anti-jamming algorithm and target judgment algorithm research to provide reference basis.