Chemical plant designs with heat or material recycle are becoming more common due to economic and environmental reasons. Underperforming control loops in chemical plants may in some cases be attributed to the presence of recycle streams. This is because recycle alters the dynamics of neighboring processes. During commissioning work, when control engineers are tuning control loops, they are ofte...

A new type of Biomimetic Underwater Vehicle (RobCutt-I) inspired by cuttlefish was designed and fabricated in this paper. The RobCutt-I has a good maneuverability and can perform multiple motion modes especially can dive or float vertically. A course controller and a depth controller for the RobCutt-I were proposed respectively based on the active disturbance rejection control (ADRC) technique....

A novel Modified PID (MPID) controller is developed to control and minimize the effect of hysteresis in Pneumatic proportional valves. It consists of four parts: a Proportional-Integral-Derivative (PID) controller, a Feedforward term, an Anti-Windup mechanism, and a Bang-Bang controller. The result is a unique Modified PID (MPID) control scheme that demonstrates better command following and dis...

This paper develops a genetic algorithm based multivariable system identification technique from plant step response data directly. Using this technique, globally optimised models for linear and nonlinear systems can be identified without the need of a differentiable cost function or linearly separable parameters. Results are validated against a benchmark identification problem and a laboratory...

Fractional order calculus is the general expansion of linear integerorder calculus and is considered as one of the novel topics for modelling dynamical systems in different applications. In this paper, the generalized state equation of the nonlinear two-terminal element which is called memristor is discussed in the fractional-order sense. The effect of the added fractional-order parameter on th...

Reducing energy consumption without compromising the quality of products in a pharmaceutical manufacturing environment and maintaining the comfort of employees is of critical important in maintaining the financial viability and competence of the company. Heating, Ventilation and Air Conditioning (HVAC) system was identified as the major energy consumer in both office building and manufacturing ...

Proportional-integral-derivative (PID) controllers are widely used in industrial control systems because of the reduced number of parameters to be tuned. The most popular design technique is the Ziegler–Nichols method, which relies solely on parameters obtained from the plant step response. However, besides being suitable only for systems with monotonic step response, the compensated systems wh...

Step response is widely used as the performance index of controlled systems. Thus, the ideal system would be one that has an output which approaches to the step signal quickly without error or over-shoot. However, if the output of an actual plant converges to the reference signal in a very short period, it can be dangerous to the surrounding environment as well as the operators. Furthermore, th...

We analyze the energy and angular momenta of the two-spin spiky string moving on the AdS3×S with NS-NS field. Due to the infinite boundary of the AdS spacetime the solution will extend to infinity and it appears the divergences. After adding the counter terms we then obtain the dispersion relation of the corresponding giant magnon and see how the background field produces the correction terms. ...

The paper involves the simulation and design of a fully differential common mode feedback circuit for a two stage Oper`ational Transconductance Amplifier. This OTA serves as the loop filter for a delta sigma modulator in 180nm Technology. Simulations were performed in Cadence software. Step response and ac analysis of the OTA was also conducted. The nonlinearity characteristics of OTA were stud...