文章基本信息

标题：Analysis of the dynamic behavior of the cracked stepped shaft used in the rotating equipment
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作者：Muhsin. J. Jweeg ; Salah. N. Alnomani ; Salah. K. Mohammad 等
期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2019
卷号：10
期号：5
页码：1-16
出版社：International Energy and Environment Foundation (IEEF)
摘要：The main objective of this research is to study the impact of cracking on the static and dynamic behavior for the purpose of faults diagnoses. Experimental and numerical analysis techniques were used for an intact shaft and for a cracked one. The natural frequency, dynamic response, equivalent stresses and total deformation of the static and dynamic behavior of uncracked and cracked rotors were detected. Several cracks with different values of depths and locations were performed for this purpose. The ANSYS package was used in numerical analysis to simulate the behavior of cracked shafts during operation and to correlate the vibration effect with the specific cracks on the shaft. The experimental work was completed by manufacturing a test rig consisting of a rotary part to monitor the dynamic behavior of the testing model. The resulting data was recorded and saved by a computer program (SIGVIEW). The effect of the crack on the response, the natural frequency, stress, and the total deformation was determined by measuring the dynamic frequency response and the vibration for each acceleration that will give a pointer to the control system, and to achieve numerical and experimental analysis during the study of centrifugal pumps and steam turbines. Results show a good agreement between numerical and experimental analyses, it was found that the maximum variance was equal to (10.55%) for the bending frequencies and (10.51%) for the torsional frequency and the dynamic response increases by 26% to 33% and the critical speed decreases by 15% to 20% at crack depth (12mm), This is very important in the detection and diagnosis of early cracks and sclerosis for the purpose of avoiding catastrophic failure.
关键词：Crack; Static; Dynamic; Shaft; Numerical analysis;