Study on the Friction Behavior and Abnormal Conditions of Non-contact Mechanical Seal Based on Acoustic Emission

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-06-02 DOI:10.1007/s11249-024-01873-1

Jinxin Chen, Junjie Lu, Yaochun Hou, Xuexing Ding, Wei Zhang

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Abstract

The main cause of failure in sealing friction pairs, friction wear, has presented analytical challenges due to rapidly changing and complex friction frequency characteristics. This has led to a focus on surface morphology treatment rather than direct measurement techniques in research. In this context, the present study adopted Acoustic Emission (AE) technology for direct monitoring of friction pairs, aiming to identify friction response signals during their transient contact and abrasion stages. Employing time–frequency analysis, the research delineated the state evolution of AE characteristics during the entire operational cycle of the friction pair, from start to stop. It has established the time–frequency information of AE signals in relation to the surface state of the sealing friction pair and deciphered the correlation between the friction AE signals and the surface state alterations of the friction pair. The study showed that the frequency of friction-induced signals in seals is 270 ± 40 kHz. The transition speeds for the friction pair’s state, moving from boundary lubrication to mixed lubrication and then to fluid dynamic lubrication, were identified as 200 rpm and 1000 rpm, respectively. Additionally, an escalation in signal activity was observed in dry friction scenarios and when surface defects were present in the friction pair, markedly exceeding the activity in conditions of no wear. This relationship between the friction signals and the operational state of the seal facilitates precise assessments of wear and operational integrity, underpinning the theoretical aspects of periodic wear in seal tribology.

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基于声发射的非接触式机械密封摩擦行为和异常条件研究

密封摩擦副失效的主要原因是摩擦磨损，由于摩擦频率特性变化快且复杂，这给分析带来了挑战。这就导致研究重点集中在表面形态处理上，而不是直接测量技术上。在这种情况下，本研究采用声发射（AE）技术对摩擦副进行直接监测，旨在识别摩擦副在瞬态接触和磨损阶段的摩擦响应信号。研究采用时频分析法，描绘了摩擦副从启动到停止的整个运行周期内声学特征的状态演变。研究建立了与密封摩擦副表面状态相关的 AE 信号时频信息，并破译了摩擦 AE 信号与摩擦副表面状态变化之间的相关性。研究表明，密封件摩擦诱发信号的频率为 270 ± 40 kHz。摩擦副状态从边界润滑到混合润滑再到流体动态润滑的过渡速度分别为 200 rpm 和 1000 rpm。此外，在干摩擦情况下以及摩擦副存在表面缺陷时，观察到信号活动升级，明显超过无磨损情况下的活动。摩擦信号与密封件运行状态之间的这种关系有助于对磨损和运行完整性进行精确评估，为密封摩擦学中的周期性磨损提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.