A comparative study of 2DOF PID and 2DOF fractional order PID controllers on a class of unstable systems

A Class of PID Controllers Tuned in Fractional Representation

The contribution is focused on design and tuning of simple controllers for continuous-time SISO systems without and with time delays by algebraic methods. The control synthesis is based on general solutions of linear Diophantine equations in the ring of proper and Hurwitz stable rational functions (RPS). Both, feedback (1DOF) a feedback and feed forward (2DOF) structures of the control system a...

transference of imagery: a comparative formalistic study of shakespeares hamlet and its two persian translations

هدف از این تحقیق بررسی انتقال صور خیال هملت در دو ترجمه ی فارسی آن از نظر فرمالیستی بود. برای بدست آوردن داده-های مورد نیاز، 130 نمونه استعاره، مجاز، ایهام، کنایه و پارادوکس در متن اصلی مشخص شده و سپس بر اساس مدل نیومارک (1998) برای ترجمه ی استعاره یا بطور کلی زبان مجاز با معادل های فارسی شان مقایسه گردیدند. این تحقیق بر آن بود تا روش های استفاده شده برای ترجمه هر کدام از انواع زبان مجاز ذکر شد...

On Fractional-Order PID Design

Stabilizing PID Controllers for a Class of Time Delay Systems

It is well known that delay exists in many practical systems such as industrial systems, biological systems, engineering systems, population dynamic models, etc... Time delay may appear as part of the internal dynamics or may result because of the actuators and sensors used. Communication delays between different parts of a system are also sources of this phenomenon. Existence of time delays ma...

Tuning of PID Controllers for First order Stable / Unstable Time Delay Systems with a Zero

PID controllers are designed for First order stable/unstable time delay systems with a zero by using IMC method. In this method first order Pade’s approximation is used while deriving PID controller parameters from IMC controller. Simple tuning rules for stable/ unstable First Order Plus Time Delay (FOPTD) system with a positive zero and unstable FOPTD system with a negative zero are given in t...