镍铝青铜合金仿生表面的砂带磨削及其降噪特性

Bionic Surface Abrasive Belt Grinding of Nickel-aluminum Bronze Alloy and Its Noise Reduction Characteristics

针对镍铝青铜合金材料难以加工出仿生沟槽表面从而提高其降噪性能的问题,利用金字塔砂带和空心球砂带在镍铝青铜合金材料表面上磨削出仿生沟槽,并搭建配套试验平台来对镍铝青铜合金材料表面进行仿生沟槽结构的磨削加工。提取了磨削表面的特征,据此进行流体噪声计算,对比分析了金字塔砂带磨削出的仿生表面和空心球砂带磨削出的仿生沟槽表面的噪声性能,结果显示:金字塔砂带磨削出的规则仿生沟槽表面声学能量等级的平均值为18.07 dB,空心球砂带磨削出的不规则仿生沟槽表面声学能量等级的平均值为37.6 dB。试验中,两种砂带磨削加工后的镍铝青铜合金表面均具有仿生沟槽结构,且金字塔砂带磨削出的规则仿生沟槽表面具有更好的水下降噪性能。

In view of the difficulty in machining bionic groove surfaces of nickel-aluminum bronze alloy to improve its noise reduction performance,the bionic grooves were grinded on the surfaces of nickel-aluminum bronze alloy by pyramid belt and hollow spherical belt,and a test platform was set up to grind the surfaces of nickel-aluminum bronze alloy with bionic groove structure.The characteristics of grinding surfaces were extracted and the finite element fluid noise analysis was carried out accordingly.The noise performance of pyramid abrasive belt grinding bionic surface and hollow ball abrasive belt grinding bionic groove surface was compared and analyzed.The results show that the average acoustic energy level of regular bionic groove surface grinded by pyramid abrasive belt is as 18.07 dB,and that of irregular bionic groove surface grinded by hollow ball abrasive belt is as 37.6 dB.In the experiments,the surfaces of nickel-aluminum bronze alloy grinded by two kinds of abrasive belt have bionic groove structure,and the regular bionic groove surfaces grinded by pyramid abrasive belt have better underwater noise reduction performance.