文档介绍：南京航空航天大学
硕士学位论文
非接触式激振器的研究与设计
姓名:于元东
申请学位级别:硕士
专业:工程力学
指导教师:纪国宜
20081201
南京航空航天大学硕士学位论文
摘要
电涡流激振器是航空发动机叶片静频测试的激振源之一,它与其他激振器比较,具有五个
优点:1、与试件不接触,对试件无附加质量和附加刚度影响,测振准确度高。2、频率范围宽。
3、适用于一切导电(磁性非磁性)试件。4、噪音小。5、成本小,体积小,质量小,结构简单,
便于维护。国外在六十年代已有使用,国内七十年代开始研制,到现在已经有针对不同用途的
多种型号研制成功。现有激振器基本上能满足各种不同激振试验的要求,但是也有一些问题,
例如振动频率与输入信号频率不一致,对小叶片的激振效果不好。本文根据现有激振器的不足
以及非接触激振试验中出现的一些问题进行了一系列非接触式激振器的研制工作。
本文主要工作是研制了三种不同用途的非接触式激振器。
一、“E 型”电涡流激振器,该激振器主要用于非导磁性宽板的激振。试验证明,该激振器具
有激振力大,被激振宽板振动频率与输入信号频率一致的优点。
二、“双 E 型”电涡流激振器,该激振器主要用于导电(导磁或非导磁)性小叶片的激振。实
验证明,该激振器对小叶片的激振效果比较好。
三、“双 E 型”磁吸式疲劳激振器,该激振器主要用于导磁性叶片的疲劳试验。理论上,该激
振器具有激振力大、均匀;工作频率宽;功耗小,效率高的优点。
关键词:电涡流,非接触,激振器,频率,宽板,小叶片,疲劳
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非接触式激振器的研究与设计
ABSTRACT
Eddy current exciter is one of the excitation source of the aero-engine blades static test
frequency . It owns five pared with other exciter: 1, with no contact with the sample,
so, there’s no the additional quality and stiffness, which highly ensured the testing-accuracy. 2, wide
frequency range. 3, applies to all conductive (ic non-ic) sample. 4, low noise. 5, small
cost, small size and quality, simple structure and easy maintenance. In 1960s, it had been used
internally abroad. In 1970s, it started to develop. Up to now it has been used in various of different
uses for the essful development of a exciter.
Existing exciter has been able to meet a variety of different vibration test requirements, but it still
has some problems, such as the frequency and signal frequency inconsistent, and bad excitation-effect
to small plate. Based on these current shortages and some question in non-contact vibration test, the
thesis did a number of studies.
This paper is focus on the developing of three kinds of uses of non-contact exciter
Ⅰ"E" eddy current exciter
It is mainly used for excitation to the wide non-ic plate. Test shows that the exciter has a
large