准周期激励下带干摩擦阻尼叶片减振特性研究
发布时间：2019-02-15 11:02
【摘要】：在叶片中间叶根处设置减振阻尼器,可以较好地解决叶片振动过大问题,当叶片受到外部激振力作用产生振动时,阻尼器与缘板之间的往复干摩擦能够消耗振动能量从而起到减振作用,同时能降低振动应力。干摩擦阻尼具有减振效果好,有效工作裕度宽,恶劣条件下能够正常工作等特点,目前已广泛应用于航空发动机转子叶片的减振设计中。从多角度研究干摩擦阻尼的减振特性及其对叶片动力特性的影响,具有特别重要的理论意义和工程实际应用价值。本文建立叶根带缘板的叶片/盘有限元模型,应用一维整体-局部统一滑动干摩擦理论,对叶片承受准周期激励及叶盘扇区质量不均匀状态时缘板干摩擦阻尼器的减振特性进行仿真分析。最后,推导一种新型“Cottage Roof”阻尼片的接触界面干摩擦理论模型,考察该型阻尼片结构参数对其减振效果的影响。本文主要研究工作如下:(1)查阅相关资料,选定准周期激励形式作为激振源。建立叶片有限元模型,开发适用于计算准周期激励的时域计算程序,得到对应算例的频率响应曲线并总结干摩擦阻尼的减振规律。(2)建立更贴合工程实际结构的叶盘扇区模型,各个叶片之间通过刚度单元和阻尼单元进行耦合,通过线性化方法得到等效刚度和等效阻尼系数,研究叶盘扇区分别在缘板阻尼片质量不均匀及叶片质量不均匀两种状态时叶片的振动特性及干摩擦阻尼的减振特性。(3)建立“Cottage Roof”型阻尼片接触界面干摩擦理论模型,得到阻尼片摩擦力与位移本构表达式及不同屋顶角度时的迟滞回线,利用能量法和一阶谐波平衡法推导等效刚度和等效粘性阻尼公式,进而建立该型阻尼片的一维整体-局部统一滑动模型。(4)设计和制造不同屋顶角度和不同厚度的“Cottage Roof”型阻尼片,通过试验结果和仿真计算结果的对比,验证该型阻尼片干摩擦理论的正确性。开发振动响应计算程序,研究“Cottage Roof”型阻尼片屋顶角度、厚度、摩擦系数、准周期激励形式对其减振特性的影响。
[Abstract]:The problem of excessive vibration of the blade can be well solved by setting a damper at the root of the middle blade of the blade. When the blade is vibrated by external excitation force, the vibration of the blade can be solved. The reciprocating dry friction between damper and plate can consume vibration energy and reduce vibration stress. Dry friction damping has been widely used in the design of aero-engine rotor blades because of its good damping effect, wide effective working margin, and the ability to work normally under bad conditions. It is of great theoretical significance and practical application value to study the vibration absorption characteristics of dry friction damping and its influence on the dynamic characteristics of blades from many angles. In this paper, the blade / disk finite element model of the blade / plate of the blade root band plate is established, and the one-dimensional integral and local unified sliding dry friction theory is applied. The vibration absorption characteristics of the edge plate dry friction damper under quasi periodic excitation and non-uniform mass in the disk sector are simulated and analyzed. Finally, a theoretical model of contact interface dry friction of a new type of "Cottage Roof" damping plate is derived, and the influence of structural parameters of the damping plate on its damping effect is investigated. The main work of this paper is as follows: (1) quasi periodic excitation is selected as the source of excitation. The finite element model of blade is established, and the time domain calculation program suitable for quasi periodic excitation is developed. The frequency response curve of the corresponding example is obtained and the damping law of dry friction damping is summarized. (2) the blade sector model is established to fit the actual structure of the engineering, and each blade is coupled by stiffness element and damping element. The equivalent stiffness and damping coefficient are obtained by linearization method. The vibration characteristics of the blade and the damping characteristics of the dry friction damping in the disk sector are studied under the condition of the uneven mass of the plate damping plate and the uneven mass of the blade respectively. (3) the dry friction theory model of the contact interface of the "Cottage Roof" damping plate is established. The constitutive expressions of friction and displacement of damping plates and hysteresis loops with different roof angles are obtained. The equivalent stiffness and viscous damping formulas are derived by using the energy method and the first order harmonic balance method. Then the one-dimensional monolithic and local unified sliding model of the damping plate is established. (4) the "Cottage Roof" damping sheet with different roof angles and different thickness is designed and manufactured, and the comparison between the experimental results and the simulation results is carried out. The validity of the dry friction theory of the damping plate is verified. The vibration response calculation program is developed to study the influence of the angle, thickness, friction coefficient and quasi periodic excitation form of "Cottage Roof" damping sheet roof on its vibration absorption characteristics.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V231.92
本文编号：2423276
[Abstract]:The problem of excessive vibration of the blade can be well solved by setting a damper at the root of the middle blade of the blade. When the blade is vibrated by external excitation force, the vibration of the blade can be solved. The reciprocating dry friction between damper and plate can consume vibration energy and reduce vibration stress. Dry friction damping has been widely used in the design of aero-engine rotor blades because of its good damping effect, wide effective working margin, and the ability to work normally under bad conditions. It is of great theoretical significance and practical application value to study the vibration absorption characteristics of dry friction damping and its influence on the dynamic characteristics of blades from many angles. In this paper, the blade / disk finite element model of the blade / plate of the blade root band plate is established, and the one-dimensional integral and local unified sliding dry friction theory is applied. The vibration absorption characteristics of the edge plate dry friction damper under quasi periodic excitation and non-uniform mass in the disk sector are simulated and analyzed. Finally, a theoretical model of contact interface dry friction of a new type of "Cottage Roof" damping plate is derived, and the influence of structural parameters of the damping plate on its damping effect is investigated. The main work of this paper is as follows: (1) quasi periodic excitation is selected as the source of excitation. The finite element model of blade is established, and the time domain calculation program suitable for quasi periodic excitation is developed. The frequency response curve of the corresponding example is obtained and the damping law of dry friction damping is summarized. (2) the blade sector model is established to fit the actual structure of the engineering, and each blade is coupled by stiffness element and damping element. The equivalent stiffness and damping coefficient are obtained by linearization method. The vibration characteristics of the blade and the damping characteristics of the dry friction damping in the disk sector are studied under the condition of the uneven mass of the plate damping plate and the uneven mass of the blade respectively. (3) the dry friction theory model of the contact interface of the "Cottage Roof" damping plate is established. The constitutive expressions of friction and displacement of damping plates and hysteresis loops with different roof angles are obtained. The equivalent stiffness and viscous damping formulas are derived by using the energy method and the first order harmonic balance method. Then the one-dimensional monolithic and local unified sliding model of the damping plate is established. (4) the "Cottage Roof" damping sheet with different roof angles and different thickness is designed and manufactured, and the comparison between the experimental results and the simulation results is carried out. The validity of the dry friction theory of the damping plate is verified. The vibration response calculation program is developed to study the influence of the angle, thickness, friction coefficient and quasi periodic excitation form of "Cottage Roof" damping sheet roof on its vibration absorption characteristics.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V231.92
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