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Acoustical Excitation for Damping Estimation in Rotating Machinery

机译：旋转机械中阻尼估计的声学激励

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摘要

In experimental modal analysis a structure is excited with a force in order to estimate the frequency response function. Typically, this force is generated by a shaker or a hammer impact. Both methods have proven their usefulness, but have some well-known disadvantages. A main disadvantage of the shaker is that it has to be fixed to the structure whereas with a hammer it is not possible to excite a specific frequency. To overcome these disadvantages, alternative non-contact methods can be used. There are several non-contact techniques, i.e. pressurized air, laser, acoustics, etc. By using acoustics as an excitation technique it is easy to select an excitation signal going from random noise to a simple sine. Also the equipment to produce the acoustic excitation is rather cheap. However, the state of the art does not offer a straightforward technique to estimate the excitation force, making it difficult for applications such as experimental modal analysis. In this research, acoustic excitation is compared with hammer excitation to estimate the frequency response function of two shafts. Especially a method to validate the force induced by the acoustics is derived. The final purpose of this research is to estimate the damping properties of rotating machinery.
机译：在实验模态分析中，用力激发结构，以估计频率响应函数。通常，该力由振动器或锤击产生产生。两种方法都证明了他们的实用性，但具有一些着名的劣势。振动筛的主要缺点是它必须固定到结构，而用锤子是不可能激发特定频率。为了克服这些缺点，可以使用替代的非接触方法。通过使用声学作为激励技术，存在几种非接触技术，即加压空气，激光，声学等，很容易选择从随机噪声到一个简单的正弦的激励信号。也是生产声学激发的设备相当便宜。然而，本领域的状态不提供估计励磁力的直接技术，使得诸如实验模态分析的应用难以实现。在该研究中，将声激励与锤激励进行比较以估计两个轴的频率响应函数。尤其是授权验证声学引起的力的方法。该研究的最终目的是估计旋转机械的阻尼性能。

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