最后根据前盖板的形状进行旋转操作，得到叶轮的三维实体模型。

Finally, according to the shape of the front cover of the rotation, three-dimensional solid model by the impeller.

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该换能器利用前盖板的弯曲振动与换能器的纵向振动耦合展宽频带。

A broadband underwater Tonpilz transducer was designed by using the coupling of transducer's longitudinal vibration mode and the bending vibration mode of front mass to widen its frequency band.

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前盖板上的副叶片可以减少叶轮进口的旋涡损失和颗粒对密封环的磨损。

Former deputy leaves on the cover can reduce the imports of the vortex impeller and particle loss of the wear and tear on the seal ring.

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