不同表面润湿性水润滑材料的摩擦特性
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海军工程大学振动与噪声研究所

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国防基础加强计划重点基础研究项目


Tribological Characteristics of Water-lubricating Materials with Different Surface Wettability
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    摘要:

    舰船螺旋桨轴与轴承之间不良的润滑状态会导致严重磨损和异常噪声,对其可靠性和隐身性带来隐患。本文选取表面润湿性不同的聚四氟乙烯(PTFE)和聚甲醛(POM)塑料在六种工况水环境下进行环—块摩擦试验,分析其摩擦学特性。使用带有高精度振动加速度传感器的摩擦试验装置采集其振动信号,通过小波包分解和重解对信号特征进行增强,拉面光谱表征试验前后材料摩擦面的分子结构。结果表明,高载荷下PTFE比磨损率随转速增大呈现线性变化,POM则出现显著的指数变化;材料在摩擦前后的表面均未发生化学变化,铜环没有擦伤和转移到材料表面;POM在低转速下摩擦振动更大,高转速下则相反;转速达到1000rpm时,POM产生了稳定的水膜,显示了良好的水润滑效果。

    Abstract:

    Poor lubrication between the ship's propeller shaft and the bearing causes serious wear and abnormal noise, which brings dangers to its reliability and stealth. In this paper, polytetrafluoroethylene (PTFE) and polyoxymethylene (POM) plastics with different surface wettability were selected to conduct ring-block friction tests under six working conditions in water environment to analyze their tribological characteristics. The vibration signal is collected by a friction test device with a high-precision vibration acceleration sensor, and the signal characteristics are enhanced by wavelet packet decomposition and reorganization. The molecular structure of the friction surface of the material before and after the test was characterized by the Raman Spectrum. The results show that the specific wear rate of PTFE under high load changes linearly with the increase of speed, while the POM shows a significant exponential change. There is no chemical change on the surface of materials after friction, and the copper rings are not scratched and transferred to the surface of materials.Compared with PTFE, the friction-induced vibration of POM is more severe at low speed and slighter at high speed. When the speed reaches 1000 rpm, the stable water film exists on surface of POM, which shows good water lubrication.

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  • 收稿日期:2021-11-30
  • 最后修改日期:2022-04-05
  • 录用日期:2022-04-24
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