磁场中激光牵引热解石墨的理论与实验研究

Theoretical and experimental study on laser traction of pyrolytic graphite in magnetic field

利用钕铁硼永磁体搭建了悬浮平台,抗磁性物质热解石墨片做悬浮物,在光热效应下,研究了激光牵引磁悬浮热解石墨的运动机制.从悬浮物受力公式出发,将其分为磁场与热场2部分影响,结合Matlab给出理论公式与实验方案,通过实验验证了理论的自洽性.使用COMSOL进行数值模拟,给出定位情况下的受力情况、磁场分布以及热场分布等.使用COMSOL建立了相关APP,可以得到磁铁序列的磁场分布、势场分布、热解石墨片的热场分布及其在磁场中任意位置的受力.

A suspension platform was constructed using NdFeB permanent magnet, and the diamagnetic substance pyrolytic graphite （PG） was suspended. The motion mechanism of laser-driven maglev suspended pyrolytic graphite was studied under the photothermal effect. The force on the suspended substance stemmed from two sources： the magnetic field and the thermal field. The theoretical formula and experimental scheme were given by Matlab. By using COMSOL, the stress, magnetic field distribution and thermal field distribution were given. In addition, COMSOL was used to establish an APP to obtain the magnetic field and potential field distribution of the magnet sequence, thermal field distribution of the PG sheet and the force at any position in the magnetic field to realize more accurate and efficient traction.