Mechanical seal friction condition monitoring based on bispectral characteristics

Abstract

Purpose

The purpose of this paper is to investigate the monitoring of the friction condition of mechanical seals.

Design/methodology/approach

Acoustic emission signals from the friction of the seal end face were obtained, and their bispectral characteristics were extracted. The variation of non-Gaussian information with the degree of friction was investigated, and by combining bispectral characteristics with information entropy, a bispectral entropy index was established to represent the friction level of the seal end face.

Findings

In the start-up stage, the characteristic frequency amplitude of the micro-convex body contact is obvious, the friction of the end face is abnormal, the complexity of the system increases in a short time and the bispectral entropy rises continuously in a short time. In the stable operation stage, the characteristic frequency amplitude of the micro-convex body contact varies with the intensity of the seal face friction, the seal face friction is stable and the bispectral entropy fluctuates up and down for a period of time.

Originality/value

The bispectral analysis method is applied to the seal friction monitoring, the seal frequency domain characteristics are extracted, the micro-convex body contact characteristic frequency is defined and the bispectral entropy characteristic index is proposed, which provides a certain theoretical basis for the mechanical seal friction monitoring.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2023-0242/

Citation

Bi, H., Hao, M., Ren, B., Xinhui, S., Li, T. and Song, K. (2023), "Mechanical seal friction condition monitoring based on bispectral characteristics", Industrial Lubrication and Tribology, Vol. 75 No. 10, pp. 1246-1252. https://doi.org/10.1108/ILT-07-2023-0242