CN-121990192-A - Air-magnetic inverted suspension type micro-low gravity test air-floatation workbench for inhibiting remanence and vortex interference

Abstract

The invention discloses a gas-magnetic inverted suspension type micro-low gravity test air-floating workbench for inhibiting remanence and vortex interference, which comprises a rigid bearing framework and a functional composite material layer. The functional composite material layer is formed by uniformly dispersing and solidifying corrosion-resistant nickel-based soft magnetic particles in a non-magnetic conductive matrix to be compounded and used as a gas-magnetic coupling working interface. The nickel-based soft magnetic particles adopted by the invention have high saturated magnetic density, low coercive force, high resistivity and good chemical stability, and ensure that the functional composite material layer formed by the nickel-based soft magnetic particles has durable and reliable working surface performance, so that the nickel-based soft magnetic particles fundamentally eliminate residual magnetic interference force and eddy current damping force on the premise of maintaining required vertical adsorption force. The design reduces unexpected horizontal interference force generated by the air floatation working table surface to one thousandth of the rated vertical bearing capacity of the air magnetic bearing, and obviously improves the accuracy of dynamic simulation in the micro-low gravity ground experiment.

Inventors

• ZHANG XIAOFENG
• SHI YUNLONG
• LI BIN

Assignees

• 天津大学

Dates

Publication Date

20260508

Application Date

20260228

Claims (5)

1. 1. The air-magnetic inverted suspension type micro-low gravity test air-floating workbench for inhibiting remanence and vortex interference is characterized by comprising a rigid bearing framework (100) made of non-magnetic conductive materials and a functional composite material layer (200) fixed on the bearing framework (100); the functional composite material layer (200) is formed by uniformly dispersing nickel-based soft magnetic particles (210) and solidifying the nickel-based soft magnetic particles in a non-magnetic conductive matrix (220).
2. 2. The air flotation table according to claim 1, wherein in the functional composite layer (200), the material of the non-magnetically permeable matrix (220) is epoxy resin or unsaturated polyester resin, the weight percentage of the nickel-based soft magnetic particles (210) is 30% to 80%, and the weight percentage of the non-magnetically permeable matrix (220) is 20% to 70%.
3. 3. The air flotation workbench according to claim 2, wherein the functional composite material layer (200) is prepared by mixing the nickel-based soft magnetic particles (210) with a non-magnetic conductive base material according to weight percentage, and molding the mixture.
4. 4. An air flotation table according to claim 3, characterized in that the functional composite layer (200) is integrated with the rigid support structure (100) by a mechanical connection or bonding process.
5. 5. The air flotation table according to claim 1, wherein the non-magnetically permeable material from which the rigid carrier (100) is made is an aluminum alloy.

Description

Air-magnetic inverted suspension type micro-low gravity test air-floatation workbench for inhibiting remanence and vortex interference Technical Field The invention belongs to aerospace ground simulation equipment, in particular to an air floatation workbench for an air-magnetic hybrid bearing system in a micro-low/micro-gravity experiment, Background The high-fidelity simulation of the space microgravity environment is carried out on the ground, and is a necessary link for developing satellite technology, space robots and on-orbit precise instruments. The suspension method and the air floatation method are two common low-gravity test methods, wherein the suspension method is suitable for ground unfolding test of a light large-size spacecraft structure, and the air floatation method can provide high-precision low-gravity test environment. The air-magnetic hybrid suspension type micro-low gravity test system combines the advantages of a suspension method and an air floatation method, an air floatation bearing in the air-magnetic hybrid suspension unit provides frictionless support, and an electromagnetic unit provides suspension force in the vertical direction. The test system is one of ideal schemes for realizing high-precision micro-low gravity environment motion simulation experiments. However, in the air-magnetic hybrid suspension type micro-low gravity test system, an air-floating platform serving as one of core components generally adopts integrated magnetic conductive metal (such as cast iron and electrical pure iron) as a structural matrix, and two types of intrinsic magnetic interference which cannot be actively compensated are introduced into the physical layer by the traditional configuration: Firstly, the nonlinear resistance caused by remanence is that after the magnetic conductive metal is magnetized by the bearing magnetic unit, the internal magnetic domains can not be completely recovered, so that the surface forms a remanence field with uneven spatial distribution. When the bearing moves, the bearing and the residual magnetic area on the platform are relatively dislocated, and the residual magnetic field generates resistance to the bearing in the horizontal direction to prevent the bearing from moving. This external force destroys the near zero external force ideal environment required for microgravity experiments. And secondly, the dynamic damping force caused by eddy current interference is excited by the sweeping magnetic field, namely, when the air-magnetic suspension unit and the platform perform relative motion, the magnetic field of the air-magnetic suspension unit sweeps at a high speed relative to the metal table top with low resistivity. According to Faraday's law of electromagnetic induction, macroscopic vortex current is generated inside the table top, and then electromagnetic damping force opposite to the movement direction is generated. This velocity-dependent viscous effect is not a real space physical environment, resulting in the simulation system losing the dynamics of "intrinsic low damping". The prior art is mostly focused on compensation or terminal vibration isolation at the algorithm level, but cannot eradicate two types of intrinsic interference forces from physical sources, namely the material properties and the magnetic circuit configuration of a working table. Therefore, development of a novel workbench capable of realizing magnetic circuit discretization constraint, blocking eddy current paths from the structural layer and inhibiting residual magnetism accumulation becomes an urgent need for constructing a high-fidelity ground simulation environment. Disclosure of Invention Aiming at the prior art, the invention provides the composite structure workbench which can remarkably inhibit the disturbance force and the eddy current effect damping force caused by residual magnetism under the working condition of high speed and light load. The invention aims to overcome systematic barriers of a traditional magnetic conductive metal air floatation workbench when a micro-low gravity environment is simulated on the ground, and the magnetic conductive metal air floatation workbench comprises (1) interference force caused by remanence, namely 'false external force' background caused by high residual magnetic induction intensity after traditional metal excitation, (2) damping force caused by vortex, namely dynamic vortex damping force excited by a sweeping magnetic field damages 'zero resistance' characteristic of the simulated environment, and (3) environmental failure problem, namely that the traditional iron-based magnetic material is easy to rust and erode after being subjected to high-precision grinding required by air floatation, so that the air film flatness is damaged and experimental environment is polluted. In order to solve the technical problems, the invention provides a gas-magnetic reverse suspension type micro-low gravity test air-floating workbench for inhibiting