control technology
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2022 ◽  
Vol 2022 ◽  
pp. 1-9
Author(s):  
Dongshuang Liu ◽  
Xinrong Liu ◽  
Zuliang Zhong ◽  
Yafeng Han ◽  
Fei Xiong ◽  
...  

Due to the complex construction conditions of shield tunnels, ground disturbance is inevitable during the construction process, which leads to surface settlement and, in serious cases, damage to surrounding buildings (structures). Therefore, it is especially important to effectively control the constructive settlement of subway tunnels when crossing settlement-sensitive areas such as high-density shantytowns. Based on the project of Wuhan Metro Line 8 Phase I, the shield of Huangpu Road Station-Xujiapang Road Station interval crossing high-density shantytowns, we study the disturbance control technology of oversized diameter mud and water shield crossing unreinforced settlement-sensitive areas during the construction process. By optimizing the excavation parameters and evaluating the ground buildings, the excavation process can be monitored at the same time, and the water pressure, speed, and tool torque required during the excavation during the construction process can be finely adjusted; the control of tunneling process parameters can provide reference and basis for analyzing the construction control of large-diameter shield through old shantytowns.


2022 ◽  
Vol 12 (2) ◽  
pp. 535
Author(s):  
Wenbo Suo ◽  
Mengyang Wang ◽  
Dong Zhang ◽  
Zhongjun Qu ◽  
Lei Yu

The formation control technology of the unmanned aerial vehicle (UAV) swarm is a current research hotspot, and formation switching and formation obstacle avoidance are vital technologies. Aiming at the problem of formation control of fixed-wing UAVs in distributed ad hoc networks, this paper proposed a route-based formation switching and obstacle avoidance method. First, the consistency theory was used to design the UAV swarm formation control protocol. According to the agreement, the self-organized UAV swarm could obtain the formation waypoint according to the current position information, and then follow the corresponding rules to design the waypoint to fly around and arrive at the formation waypoint at the same time to achieve formation switching. Secondly, the formation of the obstacle avoidance channel was obtained by combining the geometric method and an intelligent path search algorithm. Then, the UAV swarm was divided into multiple smaller formations to achieve the formation obstacle avoidance. Finally, the abnormal conditions during the flight were handled. The simulation results showed that the formation control technology based on distributed ad hoc network was reliable and straightforward, easy to implement, robust in versatility, and helpful to deal with the communication anomalies and flight anomalies with variable topology.


2022 ◽  
Vol 355 ◽  
pp. 02044
Author(s):  
Zihuan Feng ◽  
Xun liang ◽  
Chengzhen Zhao ◽  
Jiachen Wu

Since the outbreak of COVID-19, all countries have taken certain measures to restrain the spread of COVID-19. It is a complex and practical issue to study the measures and effects of the epidemic prevention and control. The spread of the epidemic in different countries has certain characteristics, and the prevention and control models and effects in different countries are also different. In this paper, the key factors affecting the prevention effect of COVID-19 were analyzed by integrating multiple data and using interdisciplinary methods of mathematics, statistics and information management science on the basis of public management, and the system model of influencing factors of COVID-19 was constructed.


2022 ◽  
pp. 339-341
Author(s):  
Caili Dai ◽  
Guang Zhao ◽  
Qing You ◽  
Mingwei Zhao ◽  
Yifei Liu ◽  
...  

2022 ◽  
Vol 118 ◽  
pp. 103013
Author(s):  
Haijun Wang ◽  
Chaojun Yan ◽  
Yaohua Guo ◽  
Xu Yang ◽  
Jijian Lian ◽  
...  

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