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18 results on '"Yu, Zhenhe"'

17. The study of obstacle avoidance algorithm for vehicles based on hierarchical fuzzy controller

Author

Yu Zhenhe and Wang Jianfeng

Subjects
Computer Science::Robotics, Obstacle avoidance algorithm, Exponential growth, Mathematics::General Mathematics, Control theory, Computer science, Control (management), Obstacle avoidance, ComputingMethodologies_GENERAL, Linear growth, Fuzzy logic
Abstract

Due to so many input and output variables, the obstacle avoidance with the single fuzzy controller can't have the fuzzy rules divided in detail, the route of obstacle avoidance is not smooth and the number of fuzzy rules increase exponentially with the increase of fuzzy input. Therefore, in order to meet the requirements of real-time control, it is necessary to use hierarchical fuzzy controller. Because the number of fuzzy rules is only linear growth rather than exponential growth. The simulation results show that this algorithm can complete the vehicle autonomous obstacle avoidance in a short time.

Published
2014
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18. Dry-Sliding Tribological Properties of TiAl Alloys and Ti2AlN/TiAl Composites at High Temperature.

Author

Zhang, Ningbo, Sun, Dongli, Han, Xiuli, Wang, Daqun, Wang, Qing, Liu, Hao, and Yu, Zhenhe

Subjects
TITANIUM-aluminum alloys, EFFECT of high temperatures on titanium alloys, WEAR resistance, MECHANICAL wear, DELAMINATION of composite materials
Abstract

The dry-sliding tribological properties of TiAl alloy and its composite Ti2AlN/TiAl were investigated comparatively in the temperature range of 25-800 °C. The wear test results showed the wear resistance of TiAl alloy and Ti2AlN/TiAl composite from 25 to 400 °C was poor, but it improved obviously when temperature was above 600 °C. Also, 15 vol.% incorporation of Ti2AlN particles was beneficial to improve the friction and wear properties of TiAl. Protective oxide layer generated on the wear surface of 15 vol.% Ti2AlN/TiAl composite from 25 to 400 °C, hence, the wear resistance improved. Ti2AlN particles played a load-carrying role and inhabited the delamination of enamel layer effectively when the temperature was above 800 °C. Overall, Ti2AlN particles which acted as hard spots changed the state of wear surface and further provided a second phase strengthening effect, which resulted in the difference in tribological behaviors between TiAl alloy and its composite. [ABSTRACT FROM AUTHOR]

Published
2018
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