Development of an Efficient Design Method for Non-Synchronous Vibrations

Speaker:

Meredith Spiker

Date of Seminar:

Fri, 2008-02-08 12:00

Semester & Year:

Spring 2008

Seminar Location:

Hudson Hall Room 207

Seminar Contact(s):

Elizabeth Irish eri@duke.edu or Justin Jaworski jwj@duke.edu

Special Instructions:

Lunch and beverages will be served

This research presents the development of an efficient design method for non-synchronous vibration (NSV). NSV occurs as a result of the interaction of an aerodynamic instability with blade vibrations. NSV has been seen in the front stages of high pressure compressor (HPC) and in fan blades, vanes, and blisks. It is a serious aeroelastic problem that has been observed by most engine companies, and the unsteady loading can reach sufficiently high magnitudes to cause blade high cycle fatigue (HCF) failures. Furthermore, there is limited knowledge of the underlying mechanisms of NSV, so failures typically do not occur until the testing phase, which often requires redesign of the blade or the rotor. This procedure is costly and greatly increases engine development time. Consequently, the predominant goal of this research effort is to establish a fast, systematic preliminary design tool for NSV for routine use by industry. The basics of the method will be presented and applied to two test cases: a cylinder and a full 3-D compressor cascade.