Papers by Author: Peng Li

Abstract: In view of the popularity of mobile device within the industry, a mobile monitor extension of PC-PLC architecture is designed and implemented. The extension module utilizes OLE for Process Control (OPC) technology to access industry control configuration software, and then publishes monitoring operations as service by employing Windows Communication Foundation (WCF), so that management staffs can monitor the process of production by any mobile device which has ability to invoke web service. Since Android operation system has a high market share, some industry controls based on Android are developed, which have been used to configure production pictures. Combing production picture generated in advance and real-time production data, the extension module is able to provide the capability of visual monitoring at any time and place.

Abstract: Dry sliding tests with electric current were carried out on a pin-on-disc system tribometer in this study, where copper-base powder metallurgy material and copper alloy QCr0.5 were used as the pin and the disc respectively. The researches were aimed at exploring relation between tribological properties and current stability of the couple under different loads. The results indicate that the current stability and friction coefficient increases with current and load. Moreover, co-effect between the current stability and tribological behavior has been found, which behaves in the way that the higher the current stability, the higher dynamic current collection capability and tribological properties.

Abstract: Recent researches have found that surfaces with non-glazed or laser dimpling topography offer improved lubricating efficiency and wear resistance under lubrication conditions over their conventional glazed status. It was carried out in this paper to simulate a pin-on-disk experimental condition and perform hydrodynamic lubrication (HL) calculations for both non-glazed and glazed surfaces under conditions of different sliding velocities and loads with a view of understanding the tribological mechanism and characteristics of non-glazed surfaces. The results showed that the minimum film thickness of non-glazed surfaces, which closed to a typical elasto-hydrodynamic lubrication (EHL) film thickness, was thicker than that of glazed surfaces under the condition of low sliding velocities and small loads. At the same time, a decreased maximum pressure of full-film of non-glazed surfaces demonstrated an even pressure distribution on them.