带失调叶片的盘片耦合系统振动特性

本文以带16个叶片的平面盘片结构作为试验件和计算模型,研究了叶片频率失调分布形式、失调幅度,失调阶次对盘片耦合系统的动力特性及受迫振动的影响。实验和计算表明这个力学模型能较全面地反映系统的特性。

COUPLING VIBRATION CHARACTERISTICS OF MISTUNED BLADED-DISK ASSEMBLY

A 16-blades-disk of flat plate is made as a test and mathematical model to study the effects of blade mistuning on the dynamic characteristics of bladed-disk assembly, as well as the effects of mistuning amplitude,mistiming order and six distribution types of mistuning on the response to forced vibration. The results show that the natural mode of a tuning system can be categorized into single-mode and double-mode. Mistuning separates the double-mode into two modes of similar frequency. The response to forced vibration of a mistuned system is greater than that of the tuning system and the former will rise with increase of mistuning amplitude. At the same exciting frequency the influences of the various distribution types on the response to the forced vibration are different, that is to say, there exists an optimal distribution type. The blade bearing the greatest response is generally the extremely mistuned one, and there certainly exists one or more blades bearing the greatest response at any exciting frequency. This might be one of the causes leading to damage of one or more blade.