نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

توسعه‌ی یک سیستم کنترل تطبیقی دو‌لایه‌ی بلادرنگ برای کاهش پاسخ لرزه‌ای سازه‌های بلندمرتبه با بهره‌گیری از فراسازگاری و الگوریتم جستجوی اکسترمم

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی عمران، واحد صوفیان، دانشگاه آزاد اسلامی، صوفیان، ایران
2 گروه مهندسی عمران، دانشگاه ملی مهارت، تهران، ایران
چکیده
در این پژوهش، یک چارچوب کنترل تطبیقی بلادرنگ با معماری دولایه برای کاهش پاسخ‌های لرزه‌ای سازه‌های بلند و دارای رفتار غیرخطی ارائه می‌شود. ساختار پیشنهادی شامل یک کنترل‌کننده تطبیقی پایه و یک لایه فراسازگار است که با بهره‌گیری از یک الگوریتم جستجوی اکسترمم فیلترگذاری‌شده، پارامترهای تطبیق را به‌صورت برخط تنظیم می‌کند. کنترل‌کننده پایه سیگنال کنترلی را بر اساس قوانین تطبیقی خروجی‌محور تولید کرده و لایه فراسازگار با تخمین لحظه‌ای گرادیان تقریبی تابع عملکرد، جهت و نرخ به‌روزرسانی ضرایب کنترلی را تعیین می‌نماید. این سازوکار بدون اتکا به مدل دقیق سازه و بدون نیاز به شناسایی اولیه، امکان سازگاری بلادرنگ با تغییرات ناگهانی یا تدریجی مشخصات دینامیکی، رفتارهای غیرخطی نظیر هیسترزیس و نامعینی‌های ساختاری را فراهم می‌آورد. ساختار iRT-SAC به‌گونه‌ای طراحی شده است که کران‌داری پارامترهای تطبیق و پایداری حلقه‌بسته تحت شرایط عملیاتی دشوار حفظ شود و درعین‌حال نیاز به بازتنظیم دستی یا بازمدل‌سازی کاهش یابد. برای ارزیابی عملکرد، روش پیشنهادی روی سازه ۲۰ طبقه بنچمارک اوهتوری و همکارانش شبیه‌سازی و با کنترل‌کننده‌های مرجع از جمله LQG، H_∞، کنترل فازی و Clipped-LQG مقایسه شده است. نتایج بیانگر کاهش حدود %۶۰ در جابه‌جایی نسبی بین‌طبقه‌ای و حفظ پایداری حلقه‌بسته در حضور عدم‌قطعیت‌های شدید و رفتار غیرخطی است. به‌طور کلی، iRT-SAC یک رویکرد تطبیقی کم‌وابسته به مدل، مقاوم و مناسب برای پیاده‌سازی عملی در سازه‌های بلند و پیچیده محسوب می‌شود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Development of a Real-Time Two-Layer Adaptive Control System for Reducing Seismic Responses of High-Rise Structures Using Hyper-Adaptation and the Extremum Seeking Algorithm

نویسندگان English

Rasoul Sabetahd 1
Ommegolsoum Jafarzadeh 2
1 Department of Civil Engineering, Sou.C., Islamic Azad University, Soufian, Iran
2 Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran
چکیده English

In this study, a real-time adaptive control framework with a two-layer architecture is proposed for mitigating the seismic responses of tall buildings exhibiting nonlinear behavior. The proposed structure consists of a baseline adaptive controller and a supervisory hyper-adaptive layer that adjusts the adaptation parameters online using a filtered extremum-seeking algorithm. The baseline controller generates the control signal based on output-feedback adaptive laws, while the hyper-adaptive layer determines the direction and rate of updating the controller gains by estimating the instantaneous approximate gradient of the performance function. This mechanism, without relying on an accurate structural model or requiring prior identification, enables dynamic adaptation to sudden or gradual changes in system dynamics, nonlinear behaviors such as hysteresis, and structural uncertainties. The iRT-SAC framework is designed to guarantee boundedness of the adaptive parameters and closed-loop stability under challenging operating conditions, while minimizing the need for manual retuning or remodeling. To evaluate its performance, the proposed method is implemented on the 20-story benchmark structure of Ohtori et al. and compared with reference controllers including LQG, H_∞, fuzzy control, and Clipped-LQG. The results demonstrate approximately a 60% reduction in interstory drift and preservation of closed-loop stability in the presence of severe uncertainties and nonlinear behavior. Overall, iRT-SAC represents a model-light, robust, and practically deployable adaptive approach for tall and complex structures.

کلیدواژه‌ها English

Simple Adaptive Control (SAC)
Hyper-Adaptation
Model-Free Control
Extremum Seeking Algorithm
Nonlinear Benchmark Structure
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