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首页> 外文期刊>Mechanical systems and signal processing >Experimental measurements of out-of-plane vibrations of a simple blisk design using Blade Tip Timing and Scanning LDV measurement methods
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Experimental measurements of out-of-plane vibrations of a simple blisk design using Blade Tip Timing and Scanning LDV measurement methods

机译：使用叶尖定时和扫描LDV测量方法对简单叶盘设计进行平面外振动的实验测量

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摘要

The study of dynamic properties of rotating structures, such as bladed discs, can be conveniently done using simple bladed discs where the blades do not have staggering angles. Simplified design, although not truly representative of real structures, can be easy and economic to manufacture and, still, very helpful for studying specific dynamic properties. An example of this can be called as mass mistune blisk study. Experimental measurements of vibrations of bladed discs under rotating conditions can be performed using Scanning Laser Doppler Vibrometer (SLDV) systems. However, in the aerospace industry, the vibrations of complex bladed discs must be measured under operating conditions which are more hostile than laboratory simulations. The Blade Tip Timing (BTT) measurement method is a measurement technique, which can be used to measure vibrations of bladed discs of an engine aircraft under operating conditions. However, the BTT technique is ineffective when used with a flat bladed disc whose blade vibrations cannot be measured. This can be detrimental when the use of controlled dynamic parameters, such as those obtained from a simple bladed disc design, can improve the confidence for the validation of post-processing software. This paper presents a work about experimental measurements of a simple bladed disc design whose vibrations were measured synchronously by Scanning LDV and BTT measurement systems. A rotating test rig and its mechanical modifications for the installation of the BTT probes are introduced. Implications of rotating a specimen inconsistently are presented so as solutions to obtained constant revolving speed. The experimental comparisons of forced response vibrations measured synchronously at one blade are presented and explained.
机译：可以使用简单的叶片盘（其中叶片没有交错角度）方便地完成对旋转结构（例如叶片盘）的动力学特性的研究。简化的设计虽然不能真正代表真实的结构，但制造起来既容易又经济，并且对研究特定的动态特性非常有帮助。这样的一个例子可以称为质量失调叶酸研究。可以使用扫描激光多普勒振动计（SLDV）系统执行旋转条件下刀片式磁盘振动的实验测量。但是，在航空航天工业中，必须在比实验室模拟更不利的工作条件下测量复杂叶片盘的振动。叶片尖端正时（BTT）测量方法是一种测量技术，可用于测量发动机在运行条件下叶片叶片的振动。但是，BTT技术与无法测量刀片振动的平刀片一起使用时无效。当使用受控动态参数（例如从简单刀片式磁盘设计获得的动态参数）可以提高对后处理软件验证的信心时，这可能是有害的。本文介绍了有关简单叶片盘设计的实验测量的工作，该叶片设计的振动是通过扫描LDV和BTT测量系统同步测量的。介绍了用于安装BTT探针的旋转试验台及其机械改进。提出了不一致地旋转样本的含义，以作为获得恒定旋转速度的解决方案。提出并解释了在一个叶片上同步测量的强制响应振动的实验比较。

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