谐振管对驻波悬浮特性的理论分析及实验

Analysis and experiment of effect of resonant tube on characteristics of standing wave levitation

为了探究谐振管的引进对驻波悬浮的影响规律,设计了4种不同类型并带有谐振管的驻波悬浮仿真模型。利用ANSYS对有、无谐振管及不同谐振管半径的4种悬浮模型进行声压分析,得到谐振管的引进在一定程度上既可能提升驻波悬浮的悬浮能力,也可能会削弱其悬浮能力。当谐振管半径略大于反射端端面尺寸时,谐振管的引进对悬浮力的提升最大。最后搭建凹-凹型驻波悬浮装置实验平台,得到与理论分析一致的实验结果。当谐振管的半径为1.023倍波长时可实现6.5mm钢球的悬浮,而当谐振管的半径为1.251倍波长时却不能实现5.5mm钢球的悬浮。

To study the effect of resonant cavity on the standing wave levitation device,four different kinds of standing wave levitation simulation model with different resonant cavities are established.The acoustic pressures of the four levitation models with no resonant cavity and with different resonant cavity radii are analyzed by ANSYS.It is found that,under certain condition,the addition of resonant cavity to the standing wave levitation device can increase its levitation ability,while under other condition it can also reduce the levitation ability.When the resonant cavity radius is slightly larger than the reflect end face radius,the increase rate of the acoustic levitation force is maximized.An experimental platform of concave-concave standing wave levitation was set up.The experiment results are consistent with theoretical analysis results.When the resonant cavity radius is 1.023 times of the wave length,a 6.5mm diameter steel sphere can be suspended,while when the resonant cavity radius is 1.251 times of the wave length,a 5.5mm diameter steel sphere can not be suspended by the device.