Estimation of rotordynamic seal coefficients using active magnetic bearing excitation and force measurement

Christian Wagner, Wataru Tsunoda, Tobias Berninger, Thomas Thümmel, Daniel Rixen

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

2 Scopus citations

Abstract

In high-speed rotational machinery such as pumps or compressors, contactless seals are commonly used to separate different fluids or gases and pressure levels. However, the presence of a leakage flow through the seal gap exerts forces on a rotor. These can culminate in stiffening, restoring, and damping effects as well as in unstable, self-excited vibrational behavior. The JEFFCOTT rotor model and rotordynamic seal coefficients are put under investigation to prevent instability in the rotating machinery and to determine the rotor-seal systems dynamic behavior. This paper focuses on an experimental methodology, examined on a flexible rotor-seal test rig using an active magnetic bearing for excitation. Coefficient identification problems due to unknown random force (noise) in the experiment are shown and a solution is described in detail and validated on the test rig. The presented methodology leads to a calculation of rotordynamic seal coefficients during safe operating conditions. They are ultimately used to describe the system’s behavior and to predict the onset speed of instability.

Original languageEnglish
Title of host publicationLecture Notes in Mechanical Engineering
PublisherPleiades journals
Pages3-15
Number of pages13
DOIs
StatePublished - 2018

Publication series

NameLecture Notes in Mechanical Engineering
VolumePartF6
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364

Keywords

  • Coefficient estimation
  • Instability
  • Rotordynamic
  • Seal
  • Self-excited vibration active magnetic bearing

Fingerprint

Dive into the research topics of 'Estimation of rotordynamic seal coefficients using active magnetic bearing excitation and force measurement'. Together they form a unique fingerprint.

Cite this