科技部高端外國專家引進計劃
“航空發動機葉片振動不确定性分析理論與設計方法”
系列學術報告
報告題目：A general geometrical theory of turbine blade underplatform dampers 描述透平葉片緣闆阻尼器動力學行為的一種通用幾何理論
報告人：Muzio Gola 教授
主持人：吳亞光 副教授，範雨 副教授
報告時間：2024年2月20日，上午11:00-12:00
報告地點：北航沙河校區F座3樓“數字發動機”多功能會議室
報告摘要
A general geometric theory of underplatform dampers as a function of blade neck deflection and the resulting platform kinematics is proposed. In-plane treatment is compatible with Mode 1 blade vibration, in which the rigid-body platform rotation associated with pure neck bending largely predominates over other rotations. The method applies when the amplitude of platform vibrational rotation reaches at least (or is greater than) the minimum value required to have, at both ends of the forward and reverse half-cycles, the onset of full slip in the last contact element still in stick.
The objective is to present a general geometric theory for damper kinematics and damper-platform forces, for both the In-Phase and Out-of-Phase blade vibrations. The concept of equivalent virtual parallel geometry is introduced, which transforms a case with nonnegligible inclination between adjacent blades into one, more tractable, valid for a very large (ideally infinite) number of blades.
The concept of a force Base-Cycle is introduced for the contact forces. Base Cycles uniquely characterize a damper shape so that, once produced for a convenient Reference Case, they can be scaled linearly without recalculation.
主講人簡介
Muzio Gola is Emeritus Professor in Department of Mechanical and Aerospace Engineering (DIMEAS) of Politecnico di Torino. He was the vice president of Polito. His main research interest focus on the mechanical aspects of aircraft turbine engines, such as: vibration and damping of turbine blades, underplatform damper design theory and experiments, contact mechanics in friction and wear at high temperature, thermal transients and fatigue in aircraft engine bladed disks. He has published more than 200 papers and undertaken project funds of more than 4 million euros.
