An Experimental Comparison of Laser Interferometer Methods for Accurate Determination of Resonant Frequencies in a Turbine Wheel Assembly

conference paper

English

This paper presents experimental research on a turbine wheel assembly used in car engines. The aim the paper is to investigate various procedures ensuring optimal search of resonant frequencies related to mechanical excitation and measuring methods. To perform the mechanical excitation described in the article, we used a vibration shaker and a modal hammer. In the given context, two measurement approaches are compared: the application of a single-point vibrometer, and the use of a special differential vibrometer. The purpose of the research is to facilitate reliable diagnostics of resonant frequencies in turbine blades, which is a process markedly responsible for the correct balancing of a turbine wheel. Such accurate determination of the resonant frequencies of a turbine wheel influences the life of the turbocharger and, moreover, enables us to eliminate possible damage to an automotive engine caused by vibrations. All the indicated measurements are mutually compared, and another comparison is performed involving the simulation results obtained from the modal analysis. The experiments demonstrate the advantages, disadvantages and differences characterising the different types of excitation and laser interferometer measurement, with a special focus on the streamlining and acceleration of experimental measurements in the development of new turbine wheels.

Laser interferometer, single-point vibrometer, differential vibrometer, modal hammer, resonant frequency, turbine wheel

KLUSÁČEK, S.; FIALKA, J.; HAVRÁNEK, Z.; BENEŠ, P.

2014

13. 7. 2014

International Institute of Acoustic and Vibration

Peking

978-83-62652-66-2

Proceedings of the 21st International Congress on Sound and Vibration

2329-3675

International Journal of Acoustic and Vibration

2014

United States of America

1

8

8