مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی تأثیر خرابی شکستن پره بر عملکرد سیستم شفت دیسک پره‌دار غیر‌خطی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
2 گروه مکانیک تجهیزات دوار، پژوهشگاه نیرو، تهران، ایران
چکیده
در کاربرد‌های صنعتی سیستم‌های شفت دیسک پره‌دار، خرابی و شکستن پره منجر به عملکرد نامناسب سیستم و آسیب به بخش‌های دیگر می‌شود. به همین دلیل پایش سلامت سازه و جلوگیری از آسیب‌های ناشی از خرابی از اهمیت بالایی برخوردار است. بررسی جابه‌جایی مرکز دیسک، جابه‌جایی یاتاقان‌ها و شکل مود در سیستم‌های روتور پره‌دار با پره شکسته برای شناسایی تغییرات دینامیکی، تشخیص خرابی، و پیش‌بینی عمر مفید اهمیت دارد. شکستگی پره، شکل مودهای سیستم را تغییر می‌دهد که می‌توان با تحلیل آن‌ها خرابی را زودهنگام شناسایی کرده و از گسترش آسیب جلوگیری کرد. این بررسی به برنامه‌ریزی دقیق‌تر تعمیرات، جلوگیری از تشدید ارتعاشات و افزایش ایمنی کمک می‌کند. در این مقاله، دو سیستم شفت دیسک پره‌دار مقایسه شده‌اند؛ در یکی ۴ پره سالم و در دیگری ۵ پره با یک پره شکسته وجود دارد. در این مدل، شفت انعطاف‌پذیر، یاتاقان‌ها غیرخطی و دیسک نامتعادل در نظر گرفته شده‌اند. اثر متقابل بین دیسک و پره‌ها و همچنین میرایی یاتاقان‌ها و پره‌ها نیز در این مدل در نظر گرفته شده است. نتایج نشان می‌دهد، جابه‌جایی مرکز دیسک از 3 میلی‌متر در سرعت دورانی 1300 دور در دقیقه به 6 میلی‌متر در سرعت دورانی 1900 دور بر دقیقه می‌رسد. جابه‌جایی در محل یاتاقان‌ها تا 7 برابر افزایش یافته و منجر به افزایش نیرو‌ها در یاتاقان می‌شود. در فرکانس‌های پایین، سیستم با پره شکسته، ارتعاشات و توان بیشتری نسبت به سیستم متقارن دارد و در فرکانس‌های 60 تا 100 هرتز، هر دو سیستم به سطح توان تقریباً یکسانی می‌رسند.
کلیدواژه‌ها

عنوان مقاله English

Investigation of the impact of blade failure on the performance of a nonlinear bladed disk-shaft system

نویسندگان English

Mohammad Amin Vesal 1
Mohammad Reza Ghazavi 1
Asghar Najafi 2
1 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Mechanical Rotary Equipment Department, Niroo Research Institute, Tehran, Iran
چکیده English

In industrial applications, blade shaft-disk systems, blade failure, leads to improper system operation and potential damage to other components. Therefore, structural health monitoring and preventing damage from failures is of high importance. Monitoring disk center displacement, bearing displacements, and mode shapes in bladed rotor systems with broken blades is essential for identifying dynamic changes, diagnosing faults, and predicting service life. Blade failure alters the system’s mode shapes, which, when analyzed, can enable early fault detection and prevent damage escalation. This process contributes to more precise maintenance planning, prevention of vibration amplification, and increased safety. In this article, two bladed shaft-disk systems are compared: one with four intact blades and another with five blades, one of which is broken. In the model, the shaft is considered flexible, the bearings are nonlinear, and the disk is unbalanced. The interaction between the disk and the blades, as well as the damping in the bearings and blades, is also accounted for in the model. Results show that the disk center displacement increases from 3 mm at a rotational speed of 1300 rpm to 6 mm at 1900 rpm. Displacement at the bearing locations increases up to sevenfold, leading to increased forces on the bearings. At lower frequencies, the system with a broken blade exhibits greater vibrations and power than the symmetrical system, and at frequencies between 60 and 100 Hz, both systems reach approximately the same power level.

کلیدواژه‌ها English

Bladed Disk Shaft System
Blade Failure
Stability
Mode Shape
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