مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بهینه‌سازی چندمعیاره جاذب‌های دینامیکی ارتعاشات (DVA) در کنترل ارتعاش سامانه‌های دو درجه‌آزادی: شکل‌دهی بهینه و کم‌پارامتر تابع پاسخ فرکانسی جاذب‌های دینامیکی ارتعاشات با استفاده از یک معیار تکین و بهینه‌سازی به کمک الگوریتم ژنتیک

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه کاشان
10.48311/mme.2025.96920.0
چکیده
روش های بهینه سازی متداول جاذب های دینامیکی ارتعاشات (DVA) کنترل مستقیم کمی روی شکل دهی پاسخ فرکانسی دارند. از طرف دیگر، چون غربالگری پارامترها ضعیف است، متغیرهای غیرضروری حذف نمی شوند و در نتیجه طراحی ها با تعداد پارامترهای زیاد شکل می گیرند.در این مقاله، یک معیار منحصر به فرد به نام ( ) معرفی می شود که چند هدف نرمال سازی شده و وزن دهی شده را در یک معیار واحد جمع می کند؛ از جمله هدف های مربوط به محل قله ها، دامنه قله ها، پهنای باند می توان اشاره کرد. علاوه بر این، یک جمله مشخص تنکی (sparsity) هم در این معیار قرار داده شده است تا از اضافه شدن پارامترهای زائد جلوگیری کند. این چارچوب در نرم افزار DeVana پیاده سازی شده است؛ نرم افزاری که نویسندگان آن را توسعه داده اند. سپس برای انجام یک مطالعه موردی، از یک مساله مرجع کاملا کوپل شده تک درجه آزادی – تک درجه آزادی استفاده شده است که در آن یک باند اجتناب مشخص در محدوده فرکانسی 1000 تا 2000 Hz در نظر گرفته می شود. نتایج نشان می دهد جاذب دینامیکی بهینه شده، رزونانس مبنا را به دو قله باریک در دو لبه باند تبدیل می کند و پاسخ داخل باند را کاهش می دهد. همزمان، بیشتر پارامترهای به سمت صفر می روند و فقط تعداد محدودی از پارامترهای β λ μ فعال باقی می مانند. همگرایی در مقدار برازش بهینه 0.001206 به دست آمده است. این مقدار برازش از 40.8% مربوط به ، 34.7% مربوط به جریمه تنکی، و 24.5% مربوط به جمله دقت هدف تشکیل می شود. در مجموع، وقتی اهداف طراحی در قالب یک هدف واحد و قابل فهم ترکیب شوند، می توان FRF را به طور مستقیم هدف گذاری کرد و فرایند طراحی DVA را ساده تر انجام داد. نتیجه این کار، تنظیم سریع و مطابق معیارهای طراحی است، آن هم با حداقل مجموعه پارامترهایی که پس از غربالگری واقعا لازم هستند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

On Multi-Criteria Optimization of DVAs in Vibration Control of 2-DOF Systems: Parsimonious FRF Shaping of DVAs via a Singular Criterion and Genetic Algorithm Optimization

نویسندگان English

Mahan Dashti Gohari
Mehdi Mohammadimehr
Faculty of Mechanical Engineering, University of Kashan
چکیده English

Conventional DVA optimization offers little direct control over shaping the frequency response, and weak parameter screening lets unnecessary variables persist, leading to over-parameterized designs. This paper presents a unique criterion (C_s) that integrates normalized, weighted objectives for peak positions, peak amplitudes, bandwidth, and other factors, incorporating a specific sparsity term that mitigates the inclusion of superfluous parameters. The framework is implemented in the DeVana software, which was developed by the authors, and it is utilized for a fully coupled 1DOF–1DOF benchmark that includes a designated avoidance band within the frequency range of 1000 to 2000 Hz for the purpose of conducting a case study. The optimized DVA divides the baseline resonance into two narrow peaks at the band edges and attenuates the in-band response, while the majority of ν parameters approach zero, leaving only a limited set of β, λ, and μ active. Convergence was achieved at an optimal fitness of 0.001206. This fitness is composed of 40.8% from C_s, 34.7% from the sparsity penalty, and 24.5% from the target-accuracy term. Overall, combining the design goals into a single, interpretable objective enables direct FRF targeting and streamlined DVA synthesis, delivering rapid, criteria-satisfying tuning with only the minimal set of screened parameters

کلیدواژه‌ها English

Dynamic vibration absorber
Vibration control
Frequency response function shaping
Singular criterion
Multi criteria optimization
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