基于微动滑移摩擦模型的失谐叶盘系统振动分析被引量：10

Vibration analysis of mistuned bladed disk system based on microslip friction model

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摘要在航空发动机叶-盘系统中,由于叶片失谐导致严重的振动局部化,造成局部叶片的高周疲劳,拟采用增加叶根干摩擦的方法降低失谐叶-盘系统振动幅值,减轻其振动局部化程度。基于微动滑移摩擦模型建立叶根阻尼器干摩擦力本构关系,采用等效椭圆代替阻尼器力与位移函数关系的迟滞回线,获得阻尼器的等效阻尼、等效刚度;将等效阻尼、等效刚度作用于叶-盘系统集中参数模型上,建立单个扇区三自由度整周失谐叶-盘系统动力学方程;采用谐波平衡法对其进行振动特性分析,讨论了叶根干摩擦对失谐叶盘系统振动特性的影响。结果表明:叶根摩擦能显著降低系统共振幅值;有叶根摩擦系统较无叶根摩擦系统的共振峰在频率上延后;增加叶根摩擦可有效降低失谐叶-盘系统的振动局部化程度。 The vibration localization is caused by blade mistuning,and then it will develop high cycle fatigue in local blade of the aero-engine bladed disk system.The method of increasing friction existed in blade root is used,which decreases the vibration amplitude and its localization degree of bladed disk system.Based on a microslip friction model the constitutive relation of dry friction force for blade root damper is formulated.The hysteresis loop expressing force and displacement relationship of damper is replaced by an equivalent oval.And the equivalent damping and stiffness are calculated,they can be used in lumped mass model of bladed disk system,thus dynamics equation for mistuned bladed disk system is established in single sector with 3-DOF.The harmonic balance method is applied to analyze vibration characteristics,and the effect of dry friction on vibration performances of mistuned bladed disk system is discussed.The results show that resonance peak value can be decreased remarkably by the friction existed in the blade roots.Meanwhile,comparing to no blade root friction system the frequency of resonance peak for the system with friction gets higher.The degree of vibration localization can be decreased effectively by increasing blade root friction.

作者张亮袁惠群韩清凯杨少明宋琳李莹

机构地区东北大学机械工程与自动化学院东北大学理学院

出处《振动工程学报》 EI CSCD 北大核心 2012年第3期289-293,共5页 Journal of Vibration Engineering

基金国家自然科学基金资助项目(50775028) 沈阳市科学技术计划项目(F10-205-1-35)

关键词航空发动机叶-盘系统微动滑移摩擦失谐 aero-engine bladed-disk system microslip friction mistuning

分类号 V231.92 [航空宇航科学与技术—航空宇航推进理论与工程]

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