In this paper, we propose a new ǫ-PID controller for DC motors. We provide a systematic design steps of selecting the gains of the proposed ǫ-PID controller. We also analytically show that the proposed controller provides robustness against system parameter uncertainty and reduces the effect of unknown load torque to the order of ǫ. The benefit of our control approach is that the PID gains are ...

This paper presents a new evolutionary computing method for the design of robust PID controller with two degrees of freedom (2DOF PID controller). Since the objective plants have a time-delay element and parametric uncertainties, the design problem is formulated as a multi-objective minimax optimization problem. Therefore the high-performed optimization method is required. The proposed evolutio...

This paper deals with a design problem of an adaptive and performance-driven PID control with an adaptive Neural Network (NN) feedforward control for discrete-time systems with a parallel feedforward compensator (PFC). By adopting PFC design scheme based on FRIT approach, which can design PFC only using an input/output experimental data, a performance-driven adaptive PID control will be propose...

Optimization algorithms inspired by the ants’ foraging behavior have been initially used for solving combinatorial optimization problems. Since the emergence of ant algorithms as an optimization tool, some attempts were also made to use them for tackling continuous optimization problems. In recent years, the investigation of synchronization and control problem for discrete chaotic systems has a...

In this paper, parameters of PID controller and bias coefficient for Load Frequency Control (LFC) are designed using a new approach. In the proposed method, the power system uncertainties and nonlinear limitations of governors and turbines ,i.e. Valve Speed Limit (VSL)and Generation Rate Constraint (GRC), are taken into account in designing. Variations of uncertain parameters are considered bet...

In this paper, a robust controller design method is first formulated to deal with both performance and robust stability specifications for multivariable processes. The optimum problem is then dealt with using a loop-shaping H∞ approach, which gives a sub-optimal solution. Then a PID approximation method is proposed to reduce a high-order controller. The whole procedure involves selecting severa...

A simple design method for robust PID controllers is presented. It is based on a multi criteria H∞ optimal control formulation, which is shown to be easily solved by a few lines of MATLAB code. This optimal solution for PID controllers including low pass filtering, is complemented by a simple paper and pen solution that can be used to obtain nearly optimal solutions. The presented approach is s...

This paper deals with a design problem of an adaptive PID control for discretetime systems with a parallel feedforward compensator (PFC) which is designed for making the augmented controlled system ASPR. A PFC design scheme by a FRIT approach with only using an input/output experimental data set will be proposed for discrete-time systems in order to design an adaptive PID control system. Furthe...

Primary immunodeficiency disorders (PIDs) are a heterogeneous group of inherited disorders that affect different components of the immune system. There are more than 150 different disorders which have been described till date. Despite major advances in the molecular characterization of PIDs over the last 20 years, many patients remain undiagnosed or are diagnosed too late with severe consequenc...

This questionnaire-based study describes in detail the attitudes of 245 carriers of recessive disorders to preimplantation diagnosis (PID). These are compared to responses to other reproductive options for carriers, that is prenatal diagnosis (PND), adoption, donor insemination (DI) and egg donation. The positive attitudes of this sample to PID and corresponding negative attitudes to adoption, ...