高温超导磁悬浮助推技术动态特性的试验分析

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. 

Dynamic characteristics of high temperature superconductor bulk magnetic suspension system

The magnetic levitation technology was regarded as a preferable alternative for the next generation of launcher system owing to its cost-effectiveness and perfect performance.A research plan was performed in our lab by constructing a scale-model suspension system with high temperature superconductor(HTS) bulks over a Nd-Fe-B guideway for launch assistance.An dynamic experimental platform was established to investigate the dynamic characteristics including amplitude frequency response characteristic,damping characteristic,levitated 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 lowest 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 enough to stabilize the levitation system during the low frequency and also was influenced by the vibration speed.By qualitative analysis the dynamic performance which could provide a evaluation for the stabilization of the magnetic levitation system and also provide a guidance for stability and security of the launch assistance suspension system.