طراحی رویتگر مرتبه کسری تطبیقی و مقاوم برای سیستم‌های لیپشیتز یک‌طرفه

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی برق و کامپیوتر - دانشگاه خوارزمی

چکیده

این مقاله به طراحی رویتگر تطبیقی برای سیستم‌های مرتبه کسری لیپشیتز یک‌طرفه پرداخته است. سیستم‌های لیپشیتز یک‌طرفه دسته وسیعی از سیستم‌های غیرخطی هستند که سیستم‌های لیپشیتز را نیز شامل می‌شوند. رویتگر طراحی‌شده به‌صورت هم‌زمان بردار حالت و پارامترهای ناشناخته سیستم را تخمین می‌زند و در برابر اغتشاش ورودی و اغتشاش محدود بر روی بهره رویتگر مقاوم است. با توجه به اینکه با به‌کارگیری روش  در طراحی رویتگر می‌توان به پایداری رویتگر در کنار عملکرد مطلوب دسترسی پیدا کرد، یک رویتگر  غیرشکننده برای این منظور طراحی و پایداری رویتگر بر مبنای قضیه لیاپانوف اثبات گردیده است. با به‌کارگیری نامساوی خطی ماتریسی ضمن کمینه‌سازی تأثیر اغتشاش در خطای تخمین، بهره رویتگر نیز به روش سیستماتیک به‌دست خواهد آمد. به‌منظور نمایش مؤثربودن رویتگر پیشنهادی، دو مثال آورده شده و نتایج شبیه‌سازی آن ارائه و با پژوهشی جدید در این زمینه مقایسه شده است. در بخش نتیجه‌گیری نیز ضمن جمع‌بندی مطالب، پیشنهادهایی برای ادامه کار مطرح شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Robust and Adaptive Fractional-Order Observer Design for One-sided Lipschitz Systems

نویسندگان [English]

  • M. Ghadimi
  • E. Amini Boroujeni
Electrical and Computer Engineering, Faculty of Engineering Department of Kharazmi university, Tehran, Iran
چکیده [English]

This paper presents adaptive observer design for one-sided Lipschitz systems. One-sided Lipschitz systems are a wide branch of nonlinear systems that include Lipschitz systems. Designed observer simultaneously estimate states and unknown parameters of the system and it is robust against input perturbation and limited observer gain disturbance. As using  observer will results in having desirable performance besides observer stability, a non-fragile  observer is presented and its stability is investigated based on Lyapunov theorem. Using linear matrix inequality causes minimizing the effect of disturbance on the estimation error addition to calculating the observer’s gain systematically. Two examples are presented to show the efficiently and performance of the proposed observer and comparison with a new research in this field. Finally the conclusion of the paper and the useful suggestions for future researches in this field is presented.

کلیدواژه‌ها [English]

  • Lyapunov stability
  • adaptive observer
  • fractional-order systems
  • one-sided Lipschitz
  • linear matrix inequality (LMI)
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