Accurate and reasonable matching design is a current and difficult point in electric vehicle research. This paper presents a parameter optimization method for the power system of a medium-sized bus based on the combination of the orthogonal test and the secondary development of ADVISOR software. According to vehicle theoretical knowledge and the requirements of the vehicle power performance index, the parameters of the vehicle power system were matched and designed. With the help of the secondary development of MATLAB/Simulink and ADVISOR software, the modeling of the key parts of the vehicle was carried out. Considering the influence of the number of battery packs, motor power model, wheel rolling resistance coefficient, and wind resistance coefficient on the design of the power system, an L9 (34)-type orthogonal table was selected to design the orthogonal test. The dynamic performance and driving range of the whole vehicle were simulated using different design schemes, and the accuracy of the simulation results was verified by comparing and analyzing the simulation images. The results demonstrated that in the environment where the wind resistance coefficient was 0.6 and the wheel rolling resistance coefficient was 0.009, with 240 sets of lithium batteries (battery energy, 264 kW h; battery capacity, 100 Ah) as the power source, the pure electric medium-sized bus equipped with the PM165 permanent magnet motor (rated power, 60 kW; rated torque, 825 N m) could obtain the best power performance and economic performance. The research content of this paper provides a certain reference for the design of shuttle buses for Nantong’s bus system, effectively reduces the testing costs of the vehicle development process, and provides a new idea for the power system design of pure electric buses.
With the continuous development of the new generation of semiconductor devices and modules, the size of high-end chips has also been further reduced. With the purpose of adapt to the rapid development of high-end chips, the chip mounting technology and equipment have also entered a rapid iterative development stage. Nowadays, the chip mounter is developing towards the direction of high intelligence, high precision, high efficiency, green and automatic. High precision patch equipment has been the focus of research at home and abroad. This paper summarizes the current situation of the demand for high-precision mounting technology of optical module laser in the 5G/6G field, introduces the main performance index requirements of high-precision mounting machine equipment, and systematically expounds the application status, advantages and disadvantages of high-precision mounting machine from three aspects of visual detection technology, mounting path optimization, and motion control system. The research shows that how to improve the speed and precision of mounting is still the bottleneck of the industry. Therefore, the research on the key technology of high precision and high-speed mounting has become an important competitive focus in the field of chip mounter equipment.
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