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Monitoring of rolling wear using the alternating current potential drop method

使用交流电势降法监测滚动磨损

基本信息

批准号：
11650144
负责人：
SHIMIZU Tomoharu
金额：
$ 2.3万
依托单位：
IWATE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

A surface damage evaluation system was developed. The alternating current potential drop (ACPD) method was used in this system. This system consists of a personal computer, a frequency generator, a power current amplifier, two DC amplifiers and two high speed A/D converters and has a compensating technique for inductive pick-up of AC voltage. The inductive pick-up is the most important cause of measurement error at ACPD method. Middle carbon steel and bearing steel were used for rolling wear specimens, and reciprocating rolling wear tests were carried out. Signals of ACPD from surface which damaged with rolling wear and applied alternating current were measured. These signals were analyzed by computer program and the phase difference between these signals was detected. Then the inductive pick-up was compensated.The conclusions which were obtained in this research are summarized in the following.(1) Using the compensation technique, the true value of ACPD could be estimated successfully.(2) Reciprocating rolling wear proceeds with producing small flaky wear particles.(3) From the change in estimated ACPD values against the number of cycles, it can be seen to the tendency of decreasing before about 10^5 cycles and increasing after about 10^5 cycles. The reason seems to change in the electrical properties of materials and current path caused from wear of lower specimens.

开发了表面损伤评估系统。该系统采用交流电位降（ACPD）法。该系统由微机、频率发生器、功率电流放大器、直流放大器和高速A/D转换器组成，并采用了交流电压感应提取补偿技术。感应传感器是引起ACPD法测量误差的主要原因。以中碳钢和轴承钢为滚动磨损试样，进行了往复滚动磨损试验。测量了滚动磨损和交变电流作用下表面的ACPD信号。通过计算机程序对这些信号进行分析，并检测这些信号之间的相位差。在此基础上，对电感拾波器进行了补偿。(1)利用补偿技术，可以成功地估计出ACPD的真实值。(2)往复滚动磨损过程中会产生细小的磨粒。(3)从ACPD估计值相对于循环次数的变化可以看出，在约10^5个循环之前有下降的趋势，在约10^5个循环之后有上升的趋势。其原因似乎是材料的电性能和电流路径的变化所造成的磨损较低的标本。