针对永磁梯度磁场作用下封闭腔内的自然对流换热，提出通过不同磁场布置产生不同磁加速度的方法。
For the natural convection in enclosure under permanent magnetic gradient field, the way to generate different magnetic accelerations by different magnetic field arrangements is developed.
试验测定振动助流时散体颗粒在初始阶段和稳定流动阶段的振动加速度信号，并对流动场中波的传播规律进行分析。
The vibration acceleration signals at initial stage and steady stage in flowing granular media are tested, and the propagation of wave in the flowing field is analyzed.
计算表明波谱分析法的结果比按特征值的规则波分析法的结果更为合理，特别是对流速与加速度场的分析尤为明显。
It is shown that spectral method gives a more reasonable result, especially for the calculation of velocity and acceleration field.
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