مجله علمی صوت و ارتعاش

مجله علمی صوت و ارتعاش

کنترل نیمه‌فعال پیش‌بین برج میلاد مجهز به میراگر جرمی تنظیم‌شده در ترکیب با میراگر سیال مغناطیسی

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی عمران، دانشکدگان فنی، دانشگاه تهران، ایران
چکیده
در این پژوهش، عملکرد لرزه‌ای برج میلاد مجهز به میراگر تنظیم‌شده‌ی جرمی نیمه‌فعال تحت رکوردهای مقیاس‌شده‌ی زلزله بررسی شده و با دو حالت کنترل‌نشده و میراگر جرمی غیرفعال مقایسه گردیده است. برای ارزیابی دقیق‌تر، هشت شاخص عملکردی شامل مقادیر بیشینه و جذر میانگین مربعات پاسخ‌های سازه مورد استفاده قرار گرفت. رکوردهای زلزله با بهره‌گیری از روش مقیاس‌سازی طیفی مبتنی بر موجک تنظیم شدند تا محتوای انرژی لرزه‌ای در بازه‌های تناوب بحرانی سازه به‌درستی بازنمایی شود و تحلیل واقع‌گرایانه‌تری از پاسخ سازه حاصل گردد. در سیستم نیمه‌فعال، دو میراگر سیال مغناطیسی به‌عنوان عنصر میرایی درون میراگر جرمی به کار گرفته شدند. برای مدل‌سازی رفتار غیرخطی این میراگرها، از شبکه‌های عصبی مصنوعی استفاده شد که پاسخ سریع‌تری نسبت به مدل‌های پارامتری سنتی ارائه می‌دهد. همچنین، کنترل‌کننده‌ی پیش‌بین برای تنظیم نیروی میرایی در میراگرهای سیال مغناطیسی به کار گرفته شد. این الگوریتم با پیش‌بینی رفتار سازه در گام‌های آینده، امکان واکنش سریع و هدفمند در برابر تحریک‌های لرزه‌ای را فراهم کرده است. نتایج عددی نشان داد که سیستم نیمه‌فعال پیشنهادی در کاهش پاسخ‌های لرزه‌ای برج عملکرد مؤثری داشته است. به‌طور خاص، مقدار جذر میانگین مربعات جابجایی، سرعت و دریفت طبقه‌ای حدود ۳۰٪ نسبت به حالت کنترل‌نشده کاهش یافت، در حالی که این کاهش در حالت غیرفعال حدود ۱۵٪ بود. جذر میانگین مربعات شتاب نیز در حالت نیمه‌فعال بیش از ۱۵٪ کاهش داشت، در حالی که در حالت غیرفعال تنها حدود ۳٪ کاهش مشاهده شد. این نتایج نشان‌دهنده‌ی اثربخشی ترکیب کنترل پیش‌بین با میرایی متغیر در ارتقای تاب‌آوری لرزه‌ای سازه‌های بلند را نشان می‌دهد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Predictive Control of the Milad Tower Using a Semi-Active Tuned Mass Damper (SATMD) Integrated with Magnetorheological Dampers

نویسندگان English

Sina Jafarpour
Seyed Mehdi Zahrai
School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
چکیده English

In this study, the seismic performance of the Milad Tower equipped with a semi-active tuned mass damper (TMD) was evaluated under scaled earthquake records and compared with two other cases: uncontrolled and passive TMD systems. For a more comprehensive assessment, eight performance indices, including peak values and root mean square (RMS) responses, were utilized. The earthquake records were scaled using a wavelet-based spectral matching method to accurately represent the seismic energy content within the critical period ranges of the structure, enabling a more realistic dynamic analysis. In the semi-active system, a magnetorheological (MR) fluid damper was employed as the damping element within the TMD. To model the nonlinear behavior of these dampers, artificial neural networks (ANNs) were used, offering faster response prediction compared to traditional parametric models. Additionally, a model predictive controller (MPC) was implemented to regulate the damping force of the MR dampers. By forecasting the structural response in future time steps, this algorithm enabled rapid and targeted reactions to seismic excitations. Numerical results demonstrated the effectiveness of the proposed semi-active system in reducing the seismic responses of the tower. Specifically, RMS values of displacement, velocity, and inter-story drift were reduced by approximately 30% compared to the uncontrolled case, while the passive system achieved around 15% reduction. RMS acceleration also decreased by more than 15% in the semi-active case, whereas the passive system showed only about 3% reduction. These findings highlight the potential of combining predictive control with variable damping to enhance the seismic resilience of tall structures.

کلیدواژه‌ها English

Telecommunication Structures'
Magnetorheological Dampers'
Tuned Mass Damper (TMD)'
Wavelet-Based Spectral Matching'
'
Model Predictive Controller (MPC)'
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