Design of the vacuum-centralized control system for the space plasma environment research facility based on the Experimental Physics and Industrial Control System
Abstract:The Space Plasma Environment Research Facility (SPERF) is a ground-simulation facility, which is under construction, for studying space plasma. It includes a terrestrial space plasma environment simulation system (T-S system) and near-space plasma environment simulation system (N-S system). Plasma experiments performed on the SPERF require the functional cooperation of each subsystem. Therefore, the Experimental Physics and Industrial Control System (EPICS) was selected as the middleware in the engineering pha… Show more
“…A group of magnets of specific structure and corresponding plasma sources are designed to meet the requirement. Four flux core magnets are used to simulate the interplanetary magnetic field and induce the laboratory solar wind, and a circular magnet is adopted to mimic the earth's dipole magnetic field (Jin et al 2022b). The straight interplanetary magnetic field and the dipole field combine to form a 3-D geometry analogous to that of the earth's magnetopause, making it possible to study the 3-D magnetic reconnection.…”
Section: Project Overviewmentioning
confidence: 99%
“…The reader is referred to the previous papers (Jin et al. 2022 a , b , 2023) to grasp the technology details of the vacuum system. Figure 2.Schematic view of the vacuum system (Jin et al.…”
Section: Key Components Of the Near-earth System Of The Sperfmentioning
Our earth is immersed in the near-earth space plasma environment, which plays a vital role in protecting our planet against the solar-wind impact and influencing space activities. It is significant to investigate the physical processes dominating the environment, for deepening our scientific understanding of it and improving the ability to forecast the space weather. As a crucial part of the National Major Scientific and Technological Infrastructure–Space Environment Simulation Research Infrastructure (SESRI) in Harbin, the Space Plasma Environment Research Facility (SPERF) builds a system to replicate the near-earth space plasma environment in the laboratory. The system aims to simulate the three-dimensional (3-D) structure and processes of the terrestrial magnetosphere for the first time in the world, providing a unique platform to reveal the physics of the 3-D asymmetric magnetic reconnection relevant to the earth's magnetopause, wave–particle interaction in the earth's radiation belt, particles’ dynamics during the geomagnetic storm, etc. The paper will present the engineering design and construction of the near-earth space plasma simulation system of the SPERF, with a focus on the critical technologies that have been resolved to achieve the scientific goals. Meanwhile, the possible physical issues that can be studied based on the apparatus are sketched briefly. The earth-based system is of great value in understanding the space plasma environment and supporting space exploration.
“…A group of magnets of specific structure and corresponding plasma sources are designed to meet the requirement. Four flux core magnets are used to simulate the interplanetary magnetic field and induce the laboratory solar wind, and a circular magnet is adopted to mimic the earth's dipole magnetic field (Jin et al 2022b). The straight interplanetary magnetic field and the dipole field combine to form a 3-D geometry analogous to that of the earth's magnetopause, making it possible to study the 3-D magnetic reconnection.…”
Section: Project Overviewmentioning
confidence: 99%
“…The reader is referred to the previous papers (Jin et al. 2022 a , b , 2023) to grasp the technology details of the vacuum system. Figure 2.Schematic view of the vacuum system (Jin et al.…”
Section: Key Components Of the Near-earth System Of The Sperfmentioning
Our earth is immersed in the near-earth space plasma environment, which plays a vital role in protecting our planet against the solar-wind impact and influencing space activities. It is significant to investigate the physical processes dominating the environment, for deepening our scientific understanding of it and improving the ability to forecast the space weather. As a crucial part of the National Major Scientific and Technological Infrastructure–Space Environment Simulation Research Infrastructure (SESRI) in Harbin, the Space Plasma Environment Research Facility (SPERF) builds a system to replicate the near-earth space plasma environment in the laboratory. The system aims to simulate the three-dimensional (3-D) structure and processes of the terrestrial magnetosphere for the first time in the world, providing a unique platform to reveal the physics of the 3-D asymmetric magnetic reconnection relevant to the earth's magnetopause, wave–particle interaction in the earth's radiation belt, particles’ dynamics during the geomagnetic storm, etc. The paper will present the engineering design and construction of the near-earth space plasma simulation system of the SPERF, with a focus on the critical technologies that have been resolved to achieve the scientific goals. Meanwhile, the possible physical issues that can be studied based on the apparatus are sketched briefly. The earth-based system is of great value in understanding the space plasma environment and supporting space exploration.
“…Compared with relay control, PLC control has low delay and high reliability. A PLC supports multiple communication protocols and can accurately control and monitor the actuators in the process of establishing a vacuum environment [ 14 ]. Li et al [ 15 ] designed a new multi-channel and scalable pressure controller based on STM32, which can output both positive and negative pressure.…”
Efficient deep-water offshore wind power installation platforms with a pressurized self-elevating mat are a new type of equipment used for installing offshore wind turbines. However, the unstable internal pressure of the pressurized self-elevating mat can cause serious harm to the platform. This paper studies the pneumatic control system of the self-elevating mat to improve the precision of its pressure control. According to the pneumatic control system structure of the self-elevating mat, the pneumatic model of the self-elevating mat is established, and a conventional PID controller and fuzzy PID controller are designed and established. It can be seen via Simulink simulation that the fuzzy PID controller has a smaller adjustment time and overshoot, but its anti-interference ability is relatively weak. The membership degree and fuzzy rules of the fuzzy PID controller are optimized using a neural network algorithm, and a fuzzy neural network PID controller based on BP neural network optimization is proposed. The simulation results show that the overshoot of the optimized controller is reduced by 9.71% and the stability time is reduced by 68.9% compared with the fuzzy PID. Finally, the experiment verifies that the fuzzy neural network PID controller has a faster response speed and smaller overshoot, which improves the pressure control accuracy and robustness of the self-elevating mat and provides a scientific basis for the engineering applications of the self-elevating mat.
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