介绍了液压往复杆式密封是否发生泄漏的影响因素，指出密封表面粗糙度和杆速是决定密封是否泄漏的重要因素。
The paper introduce the leakage influences factor of reciprocating rod seals; the roughness of the seal surface and the rod speed are the important parameter of seal leakage.
推导了表面振速分布不均匀的辐射器的辐射阻抗与辐射器辐射声功率之间的关系。
The relationship between the radiation impedance and the acoustic radiated power of the radiator with non-uniform vibrating velocity on the surface is formulated.
工作台直径500毫米以上，机床还具有恒速切削装置（确保工件不同直径线速趋于一致），可获得被磨表面质量一致性。
The diameter of the working table is above 500mm and the grinder is furnished with a controller of constant cutting for a consistent quality of the ground surface.
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