采取增厚加强肋的办法不断提高了油底壳的强度，而且也达到了降噪增频的作用，从而有效地控制了油底壳的裂纹。
An effective control of cracks at oil-reserving bottom comes from increasing strength of the bottom by thickening reinforcing rib, and increasing frequency by reducing noise also achieves.
本文介绍了一种新型的高强度、高阻尼、耐腐蚀性优良的螺旋桨专用合金在降噪效果方面的试验研究成果。
A new propeller alloy with high strength, high damping capacity and excellent corrosion resistance has been put to damping effect test.
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