Non-contact Excitation and Measurement of Integrally Bladed Disk (BLISK) for Mistuning Identification

叶片失谐是在组装的整体叶盘系统以及 ** 单件叶盘（称为“整体叶盘”）中遇到的一种现象。失调是由于叶片之间的几何形状或 ** 材料特性的微小变化造成的，并会导致操作条件下的重要振动和疲劳问题。因此，在制造过程中正确识别和控制整体叶盘失调是至关重要的。与 ** 装配的叶盘系统相反，叶盘失谐必须通过测量整个叶盘来确定。**我们的合作伙伴正在寻找精确的、非接触式激励和测量技术，以识别其整体叶盘的失调 **。该项目将评估和测试两种用于失谐识别的非接触候选激励技术：** 磁和声学。我们的合作伙伴将提供一个现有的原型整体叶盘，在每个叶片附近安装一个电磁铁环，并在每个叶片上安装铁磁贴片。在叶片附近使用电动或参数扬声器的替代解决方案也将在叶盘的有限扇区内进行研究。两种激励模式都将使用有限元法进行数值模拟 **，并在原型整体叶盘上进行实验测试。**这项工作的逻辑延续将解决一个完整的圆周 ** 阵列的近场扬声器的设计和实施，以创建行波激励和识别失谐。后续 ** 工作将在下一个CRD项目下进行。整体叶盘是昂贵的部件，在制造过程中监测失谐仍然是一个悬而未决的问题。我们的 ** 合作伙伴正在寻找创新和有效的失调识别方法，这将最终提高 ** 制造精度和质量控制的关键部分，在制药。

Blade mistuning is a phenomenon encountered in assembled turbomachinery blade-disk systems as well as**one-piece bladed disks (called "blisks"). Mistuning is due to small variations of blade-to-blade geometries or**material properties and results into important vibration and fatigue issues in operating conditions. It is therefore**crucial that blisk mistuning be properly identified and controlled during the manufacturing process. Contrary to**assembled blade-disk systems, blisk mistuning must be identified from measurements of the entire bladed disk.**Our partner is looking for accurate, non-contact excitation and measurement techniques to identify mistuning**of their blisks.**The project will evaluate and test two non-contact candidate excitation techniques for mistuning identification:**magnetic and acoustic. Our partner will provide an existing prototype blisk instrumented with a ring of**electromagnets at close distance from each blade and ferromagnetic patches attached to each blade. The**alternative solution of using electrodynamic or parametric loudspeakers at close distance from the blades will**also be investigated over a limited sector of the blisk. Both modes of excitation will be simulated numerically**using the Finite Element method and tested experimentally on the prototype blisk.**A logical continuation of this work will address the design and implementation of a complete circumferential**array of nearfield loudspeakers to create traveling wave excitation and identify mistuning. The continuation**work would be conducted under a following CRD project.**Blisks are costly parts, and monitoring mistuning during the fabrication process is still an open problem. Our**partner is looking for innovative and efficient mistuning identification methods, that would ultimately improve**manufacturing accuracy and quality control of such crucial parts in turbomachines.