An Analysis of ‘Ringing’ Phenomena in a Water Pump Mechanical Seal (Part III)

Abstract

In the previous papers (1) and (2), the “ringing” phenomenon in a water pump seal was investigated experimentally. It became clear that the ringing sound was generated by ‘stick-slip’ attributed to both the lubrication characteristics of the sealing surfaces and also the torsional vibration characteristics of component parts. Subsequent to the investigation, it becomes clear that ringing can be classified into two types of acoustic sounds. One is a higher frequency sound which is caused by the torsional vibration characteristics of the rotating parts as reported in Refs. (1) and (2). The other is a lower frequency sound which is related to the natural frequency of stationary parts of the seal. This paper presents the experimental analysis of the lower frequency sound caused by the torsional vibration of the stationary parts, and the theoretical background of the higher and lower frequency characteristics are analyzed.