| Summary: | 碩士 === 崑山科技大學 === 機械工程研究所 === 95 === The earlier stage of the 20th century is the E period (electrical power times). However, over the past decades, it had been the P period (Petroleum & Plastic ages). The natural materials such as bamboo, linen, rind have been replaced by the polymers. Therefore, the industrial materials have more extensive applications.
The static discharge (ESD) may occur on the surfaces of the polymers especially in the dry and cold conditions. When the opposing bearing surfaces slide against each other under a normal load, they generally exhibit the charge transfer between them. This phenomenon is called the frictional electrification or the tribo-electrification. When the static charging accumulated to a larger voltage, the spark discharge then occurs and may cause the fire and the explosion in the organic gas.
Moreover, it also may be possible that the undesirable influences for the electrical signals are caused by the smaller surface charging. Hence, the tribo-electrification voltage not only influences the personal safety but also the developments of the electrical industry. For example, the quality of machined products in the manufacturing process of the IC, LSI and VLSI is significantly by tribo-electrification. Even its value may be only in the range of 0.1V. Therefore, the managing standard of the static electricity have been concluded by the manufacturers over the past decades.
Based on the above reasons, the study on the sliding parts of the fitness machinery has been investigated in this study. The experiments were conducted on a rotating friction tester with a measuring system. The experimental parameters include the materials of the running belt and plate, normal load, sliding speed and frictional time. As a result, the tribo-electrification voltage and the friction coefficient of the different materials can be measured. The experimental results showed that the tribo-electrification voltage and friction coefficient increase with increasing the normal load, sliding speed and frictional time. Moreover, the effect of the humidity was also similar. The results of this study have not only an original opinion, but also it is very helpful in suggesting the desirable material to the manufacturers.
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