Abstract
As a unique monitoring technique, electrostatic monitoring has been proved to be effective on prognostics and health management of tribological system by using electrostatic sensors. Wear-site sensor (WSS) with a flat circle probe and oil-line sensor (OLS) with a ring probe are two typical sensor types for electrostatic monitoring. However, this developing technique has not been applied in actual industry manufacture so far due to the united characteristics on electrostatic sensors. This paper first presents the mathematical models of both WSS and OLS for theoretical simulation. Then a series of contrast analysis on sensor characteristics between WSS and OLS with varied sensor structure parameters are presented. The results show that the distributions of spatial sensitivity for WSS or OLS itself only are similar, while they are quite different between WSS and OLS. Both WSS and OLS are symmetrical and their distributions can be simplified in one phase for further investigations. The theoretical efficiency curves have close relationship between WSS and OLS. The investigations of sensor performances on characteristics and a presented unified three level system have offered a better electrostatic sensor application in future.
Highlights
On-line condition monitoring with smart sensors is an essential part in the prognostics and health management (PHM) of mechanical equipment [1,2,3]
The typical 3D distribution and 2D color map of spatial sensitivity is simulated for both Wear-site sensor (WSS) and oilline sensor (OLS) with the results presented in Figures 4 and 5
The main conclusions are summarized: (1) Owing to their different sensor structures, the distributions of spatial sensitivity to the probe are quite different for electrostatic WSS and OLS
Summary
On-line condition monitoring with smart sensors is an essential part in the prognostics and health management (PHM) of mechanical equipment [1,2,3]. Different from a unique developing technique which is called the electrostatic monitoring method has been investigated based on electrostatic charging phenomena [9, 10]. This technique has been proved to be effective for tribological contacts by using electrostatic sensors [11,12,13,14]. Unlike monitoring the traditional secondary effects such as temperature and vibration, electrostatic sensing technique is considered as a direct measurement for friction and wear It can provide early warnings before severe failures for essential maintenance. A series of contrast between wear-site sensors (WSSs) and oil-line sensors (OLSs) have been investigated based on their characteristics. A unified three level system for characteristics of electrostatic sensors, processed to be suitable for both WSSs and OLSs, has been presented
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