报告人：Carlos Martel教授

Speaker: Prof. Carlos Martel

主持人：王丁喜教授

Host: Prof. Dingxi Wang

时间：2019年4月9日（星期二）上午10:00-11:00

Time: 10:00am-11:00am, April 9, 2019

地点：长安校区动力与能源学院大楼225会议室

Place: Conference room 225, School of Power and Energy

主题：主动失谐对随机失谐强迫响应灵敏度的影响

Topic: Intentional mistuning effect on the forced response sensitivity to random mistuning

内容简介:

主动失谐通常用来降低固有随机失谐的不可控振动放大效应，并降低其灵敏度。其思想就是引入一个主动的失谐模式，这个模式很小，但是比现有的随机失谐大得多。相邻叶片的频率因为主动失谐而错开，减少了叶片之间的耦合影响，从而减少了随机失谐的影响。在分析问题时采用渐近失谐模型方法。该方法推导了一个降阶模型，来帮助我们理解主动失谐的作用机理，并给出了一个简单的表达式来估计其优化效果，同时将简化模型的结果与两个更为真实的失谐转子的有限元模拟结果进行了比较。

Introduction:

Intentional mistuning is a common procedure to decrease the uncontrolled vibration amplification effects of the inherent random mistuning, and to reduce the sensitivity to it. The idea is to introduce an intentional mistuning pattern that is small but much larger than the existing random mistuning. The frequency of adjacent blades is moved apart by the intentional mistuning, reducing the effect of the blade-to-blade coupling and thus the effect of the random mistuning. The problem is analysed using the Asymptotic Mistuning Model methodology. A reduced order model is derived that allows us to understand the action mechanism of the intentional mistuning, and gives a simple expression for the estimation of its beneficial effect. The results from the reduced model are compared with those from the FEM simulation of two more realistic mistuned rotors.

报告人简介

Carlos Martel自2009年起在马德里理工大学担任教授，他在1995年取得了应用数学的博士学位。他的研究活动始于基本流体力学问题（对流、水波、边界层）的非线性动力学领域。在过去的15年中，他与业界密切合作，参与了叶轮机械不同气弹问题的研究，主要涉及转子颤振和强迫响应振动中失谐效应的分析和描述。发表科技成果40余项，参加国际会议35余次。在过去10年中，他参与了30多个研究项目，领导了其中13个。

Speaker’s Biography

Carlos Martel is Professor of Aerospace Engineering at Universidad Politécnica de Madrid (Spain) since 2009, where he also completed his PhD in Applied Mathematics in 1995. His research activity started in the field of nonlinear dynamics applied to basic fluid mechanics problems (convection, water waves, boundary layer). In the past 15 years he has been involved in the study of different aeroelastic problems in turbomachinery in close collaboration with the industry, mostly related to the analysis and description of mistuning effects in the flutter and forced response vibration of rotors. He has published more than 40 scientific and technical contributions, and has participated in more than 35 international conferences. He has taken part in more than 30 research projects, leading 13 of them in the past 10 years.