Sub-mN-level superconductive plane suspension type vacuum attitude and orbit control test system

Abstract

The invention discloses a sub-mN superconductive plane suspension type vacuum attitude and orbit control test system, which specifically comprises a superconductive translation magnetic suspension system, a dual-mode motion measurement device and an ultralow-temperature refrigeration system, and realizes a large-area low-damping translation suspension method based on complete diamagnetism of a superconductor under zero-field cooling. A superconductive fence structure is introduced to inhibit the fringe effect of a superconductive plane, and more than 80% of an effective translation area is realized; in order to achieve a high-suspension air gap exceeding 10 mm, the superconductive temperature of the ultralow-temperature refrigerating system is required to be lower than 5 K; in order to realize sub-mN level translation resistance, the low-temperature uniformity of a superconducting plane is required to be superior to 0.5 K, the mounting planeness is required to be superior to 0.5 mm, and the magnetic field uniformity of a circular ring magnetic structure below a permanent magnetic levitation platform is controlled to be 1% or less; in order to measure the [mu]N-level micro force, a combined measurement mode of circumferential distribution of four precision nm-level displacement sensors is adopted; and in order to evaluate the large-range motion control capability of the micro-thruster, binocular vision is adopted to collect motion trails.

Description

technical field [0001] The invention relates to the field of space thruster micro-thrust measurement and evaluation and micro-satellite half-physical simulation, in particular to a sub-mN level superconducting plane suspension type vacuum attitude orbit control test system. Background technique [0002] With the continuous development of space exploration technology, micro-satellites have attracted widespread attention due to their low cost and flexible space deployment, and their missions have become increasingly complex. These space missions put forward high requirements on the maneuverability, attitude and orbit control capabilities, and even drag-free control levels of micro-satellites. Electric propulsion is one of the driving devices of micro-satellites. According to different space missions, the thrust level of the thruster can be extended from N level to mN level, or even μN level. Micro-thrust poses a challenge to the ground hardware-in-the-loop simulation experimen...

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Problems solved by technology

[0005] There are also some difficulties in the design of the superconducting translational magnetic levitation system. First, the size of a single superconductor is limited, and it is difficult to achieve a large-scale low-damping planar motion. repulsive force, only the central part of the region is an effective superconducting translational area, which limits the movement space of the floating platform carrying the satellite; The hysteresis damping force will affect the resolution of thrust evaluation; the diamagnetism of high-temperature superconductors depends on the uniformity of the low-temperature environment, and the lower the temperature, the stronger the diamagnetism, and the problems of heat leakage and uneven temperature distribution of large-area superconducting planes are Another major problem affecting the performance of translational damping

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