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为了实时掌握叶片振动情况、预防故障发生,目前最常用的非接触振动测量方法是基于单自由度模型的叶尖定时法,但当叶片耦合振动时2个振动峰相隔很近,该方法无法同时识别出其振动参数。采用基于2自由度模型的曲线拟合方法,得到叶片耦合振动2个峰的初始相位等参数,用相位遍历法辨识出叶片的振动阶次和频率。结果表明:采用基于2自由度模型的曲线拟合方法提高了叶片耦合振动参数辨识的精度,辨识了相邻2个峰的振动参数。辨识振动与仿真参数设置基本一致。
In order to grasp the vane vibration in real time and prevent the occurrence of the fault, the most commonly used non-contact vibration measurement method is based on the single-degree-of-freedom model of the tip timing method, but when the vane coupling vibration two vibration peaks are very close, this method can not simultaneously Identify its vibration parameters. The curve fitting method based on two degrees of freedom model was used to get the initial phase and other parameters of the two coupled vibration vanes. The phase traversal method was used to identify the vibration order and frequency of the blade. The results show that the curve fitting method based on two degrees of freedom model is used to improve the identification precision of vane coupling vibration parameters and the vibration parameters of two adjacent peaks are identified. Identification of vibration and simulation parameters are basically the same.