In recent years, automatic mobile robots (AMRs) have been widely concerned in various fields, such as material handling, unmanned aerial vehicle (UAV) cruise, automatic factories and so forth. Compared with traditional robots, an AMR system brings several challenges such as adaptation to the environment, stable communication and robust control. For example, in a complex environment, AMR has to observe the surrounding environment in real time to avoid obstacles, and track the target in real time to change its trajectory until the task is completed, based on an efficient integration of the perception, communication and control. AMR systems require support from various technologies including real-time positioning and navigation, trajectory planning, target tracking, multi-agent systems, robot monitoring and so forth. In order to enable more enhanced applications of AMRs, the geometric adaptability, design characteristics, mobility, flexibility, obstacle avoidance and fault-tolerant control should be further discussed. This paper provides a comprehensive elaboration on the four aspects of AMR systems, namely AMR applications, perception technologies, robot communications and control mechanisms. Future research directions are also pointed out.

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High-precision suppression technology for the cold rolling mill control precision of hydraulic AGe system is put forward higher requirements. On the basis of related theory introduction, the article respectively analyzes the forward feedback AGe, monitor AGe system and a second flow control AGe system in detail, and expounds the various factor's influence on the control precision of the system. In addition, this article also makes reasonable modeling analysis and simulation for each main part, which provides the basis for optimization design of hydraulic AGe system of cold rolling mill and the research of the control performance.