Dynamic characteristics of high temperature superconductor bulk magnetic suspension system
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摘要: 磁悬浮技术由于其高性能、低成本特性而被认为是一种较为理想的下一代发射 系统方案.在概念研究方案的基础上建立了一套磁悬浮助推缩比试验系统,针对 缩比试验系统的设计要求,建立动态测试试验分析系统,研究了YBaCuO高温超导体组合与 NdFeB永磁体轨道所构成的磁悬浮系统单元的幅频响应特性、阻尼特性以及悬浮刚度特 性等.试验表明,系统共振频率随场冷位置的提高线性降低,在零场冷时达到最低.系统静 态刚度随悬浮气隙的提高逐渐降低,动态刚度受到场冷位置的影响明显.对磁浮系统 阻尼特性进行的试验研究显示超导系统低频下具有弱阻尼特性,并受振动速度的影响.通过 定性分析磁浮系统的综合动态性能,更好的评估系统稳定特性和品质,为磁悬浮助推发射试 验平台工作的稳定性和可靠性提供基本保证.Abstract: The magnetic levitation technology was regarded as a preferable alternative for the next generation of launcher system owing to its cost-effectivenes s and perfect performance. A research plan was performed in our lab by constructing a scale-model suspension system with high temperature superconduct o r (HTS) bulks over a Nd-Fe-B guideway for launch assistance. An dynamic experi me ntal platform was established to investigate the dynamic characteristics includi ng amplitude frequency response characteristic, damping characteristic, levitate d stiffness and so on. The experimental result show that the resonant frequency is decreased with the increase of the field cooling(FC) position and reach lowes t at zero field cooling(ZFC) position. The static-stiffness is decreased with the increase of the suspension gap and dynamic stiffness was influenced by the FC position. Damping, the ability of a system to decrease oscillatory seems not e nough to stabilize the levitation system during the low frequency and also was i nfluenced by the vibration speed. By qualitative analysis the dynamic performanc e which could provide a evaluation for the stabilization of the magnetic levitat ion system and also provide a guidance for stability and security of the launch assistance suspension system.
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Key words:
- dynamic response /
- damping /
- vibration measurements /
- frequencies /
- magn etic levitation
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