@inbook{332829687b43401bafa0b615d018e7ab,
title = "Estimation of rotordynamic seal coefficients using active magnetic bearing excitation and force measurement",
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{\textquoteright}s behavior and to predict the onset speed of instability.",
keywords = "Coefficient estimation, Instability, Rotordynamic, Seal, Self-excited vibration active magnetic bearing",
author = "Christian Wagner and Wataru Tsunoda and Tobias Berninger and Thomas Th{\"u}mmel and Daniel Rixen",
note = "Publisher Copyright: {\textcopyright} Springer International Publishing AG, part of Springer Nature 2019.",
year = "2018",
doi = "10.1007/978-3-319-91217-2_1",
language = "English",
series = "Lecture Notes in Mechanical Engineering",
publisher = "Pleiades journals",
pages = "3--15",
booktitle = "Lecture Notes in Mechanical Engineering",
}