It is verified by means of model test that the ship vibration is caused by the propeller-excited force, which is generated by the propeller running in the non-uniform stern flow field.
并通过模型试验进一步证实该船振动的成因主要是由于螺旋桨在不均匀流场中运转时产生的激振力所致。
An expression of energy difference rate in a plate of non-uniform thickness with a crack of mixed mode under both body force and surface tractions in a non-uniform temperature field is derived.
本文推导出了含复合型裂纹的变厚度板在承受体力和面力、存在非均匀温度场的情况下的能量差率表达式。
The formulae of magnetic moment of a space coil and moment of magnetic force acted on a coil in a uniform magnetic field are presented.
文中导出了任意形状的空间载流线圈磁矩的计算公式及其在均匀磁场中所受磁力矩的计算公式，结果表明本文的结论与电磁学理论的有关知识是相合的。
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