Title page for ETD etd-07132009-192300

Type of Document Master's Thesis
Author Sterling, John Anthony
URN etd-07132009-192300
Title Influence of Induced Unbalance on Subsynchronous Vibrations of an Automotive Turbocharger
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Kirk, R. Gordon Committee Chair
Kasarda, Mary E. F. Committee Member
Wicks, Alfred L. Committee Member
  • Turbocharger
  • Instability
  • Subsynchronous
  • Unbalance
Date of Defense 2009-06-22
Availability unrestricted
Rotordynamic instability is present in most or all automotive turbochargers. High subsynchronous amplitudes can cause a variety of problems in areas such as mechanical failures, emissions regulations and rotor design. Self-excited vibrations from sources of damping can lock in at lateral natural frequencies causing dangerously high vibration levels. The resulting high-amplitude conical and bending modes can be reduced in order to achieve a more robust system.

This research focuses on the relationship between synchronous and subsynchronous amplitude levels. It is theorized that an increase in unbalance could cause a reduction in subsynchronous vibration amplitudes. Through the use of a custom turbocharger, a series of unbalances were applied to both the turbine and compressor wheels and the resulting amplitudes were recorded off a modified compressor nut. The resulting data were reduced and are presented at the end of this paper.

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