Efficient Design Method for Non-Synchronous Vibrations Using Enforced Motion

摘要: This paper presents the results of a new enforced motion method using harmonic balance computational fluid dynamics (CFD) analysis to design for NSV. Currently, most researchers employ time domain CFD technique directly find frequency underlying flow instability which can take significant time. NSV is said occur when coincides with blade mode frequency. The uses attempt force lock-on vibration at specified amplitude. For fixed critical amplitude and frequency, range interblade phase angles (IBPAs) investigated determine aerodynamic damping. A negative value damping any IBPA deems unacceptable. Furthermore, procedure re-design (frequency changing) presented. At least stable IBPA, determined frequencies amplitudes Limit Cycle Oscillation (LCO) better then that minimizes Therefore, these preliminary indicate it advantageous include in approaches. Most significantly, gives designers quick efficient assess NSV.Copyright © 2008 by ASME