Emmanuel Gonzalez

• Ph.D. in Electronics and Communications Engineering
• Manager at Schindler Elevator Corporation, Ohio, USA

Polarization Index (P.I.) is one of the measures used in evaluating the “goodness” of the insulation resistance of an electric machine. This particular parameter is defined by the IEEE Std 43 as the ratio of the insulation resistance of the motor measured after 10 minutes, i.e. I.R.10, with respect to the insulation resistance measured after 1 minu...

The problem of changing the dynamics of an existing DC motor control system without the need of making internal changes is considered in the paper. In particular, this paper presents a method for incorporating fractional-order dynamics in an existing DC motor control system with internal PI or PID controller, through the addition of an external con...

Fractional calculus is more than a three hundred-year-old concept way back during the time of de l'Hospital and Leibniz focusing on derivative and integrals having non-integer orders. Almost four decades ago, engineers and scientists began to venture into the field of fractional calculus by unfolding its applications where fractional differential e...

In the past decade, researchers working on fractional-order systems modeling and control have been considering working on the design and development of analog and digital fractional-order differentiators, i.e. circuits that can perform non-integer-order differentiation. It has been one of the major research areas under such field due to proven adva...

(Available Online: http://viXra.org/abs/1401.0016) In this short note, we present the analog realization of a fractional-order differentiator of order α = 1/2 in 0.35 µm CMOS technology.

The interest in fractional-order (FO) control can be traced back to the late nineteenth century. The growing tendency towards using fractional-order proportional-integral-derivative (FOPID) control has been fueled mainly by the fact that these controllers have additional “tuning knobs” that allow coherent adjustment of the dynamics of control syste...

A generalized fractional-order PID controller topology, implemented using operational amplifiers (op-amps) as active elements is presented in this paper. The main attractive characteristic, frοm the design versatility and flexibility point of view, is the offered extra degrees of freedom and this is achieved using appropriately interconnected fract...

This paper discusses and summarizes some results on complex variables that are very useful in fractional-order systems analysis and design, specifically when the system is analyzed in the frequency domain. The author hopes that this document will serve as a handy reference when performing computations with complex variables, especially when working...

One of the common test metrics prescribed by IEEE Std 43 for testing motor insulation is the Polarization Index (P.I.) which evaluates the “goodness” of the machine’s insulation resistance by getting the ratio of the insulation resistance measured upon reaching t2 > 0 minutes ( IRt 2 ) from t1 > 0 minutes ( IRt 2 ) for t2 > t1 > 0, after applying a...

One of the common test metrics prescribed by IEEE Std 43 for testing motor insulation is the Polarization Index (P.I.) which evaluates the "goodness" of the machine's insulation resistance by getting the ratio of the insulation resistance measure upon reaching t2 > 0 minutes (IR_t2) from t1 > 0 minutes (IR_t1) for t2 > t1 > 0, after applying a DC s...

This study focused on the design and implementation of a four selectable Fractional-Order (0.2, 0.4, 0.6 and 0.8) Differentiator (FOD) in a 0.35 μm CMOS technology operated at 1.5 V supply. In comparison with previous research that use discrete components and generic microcontroller to switch an FOD from one order to the next, this design of a sele...

This study demonstrates the utilization of model reference adaptive control (MRAC) for closed-loop fractional-order PID (FOPID) control of a magnetic levitation (ML) system. Design specifications of ML transportation systems require robust performance in the presence of environmental disturbances. Numerical and experimental results demonstrate that...

The interest towards using Fractional-order (FO) PID controllers in the industry is mainly fueled by the fact that these controllers have two additional “tuning knobs” that can be used to adjust the control law in a way that would benefit the control loop. However, there are certain points that are rarely addressed in literature, namely: (1) What a...

A stunning outcome of fractional calculus for control practice are fractional-order PID (FOPID) controllers. Based on their experimental and numerical results, several studies have reported improvements in control performance of closed loop control systems by FOPID controllers compared to classical PID controllers. However, the industry at large is...

This paper presents a method of retrofitting an external controller into an existing feedback control system governed by a classical proportional-integral (PI) controller to improve the overall dynamics of the entire control system by benefitting from the advantages of fractional-order dynamics in the form of a fractional-order proportional derivat...

In the present paper, the problem of digital implementation of retuning fractional-order (FO) controllers for an unstable plant — a real-life laboratory model of a Magnetic Levitation System (MLS) — is investigated. Retuning control is applied to an existing closed-loop PID control system through the use of a hardware FO controller prototype. An im...

In this paper, we study the problem of fractional-order PID controller design for an unstable plant - a laboratory model of a magnetic levitation system. To this end, we apply model based control design. A model of the magnetic lévitation system is obtained by means of a closed-loop experiment. Several stable fractional-order controllers are identi...

Hazard identification is a very crucial part in any safety management system since it is the stage where a worker detects, recognizes and evaluates hazardous conditions in his/her work environment. From there, the worker is then able to perform necessary risk assessments and evaluate control measures that could be employed to ensure that the risks...

This paper presents a decision support system that helps in performing job hazard analysis by assigning the occurrence and consequence values, which in turn will result in an evaluation of a risk value as well as a recommendation. The software-based tool was designed considering the fact that each and every expert has his own personal and perceptua...

Most of the developing countries, suffer from an intrinsic and extrinsic divide between the classroom education and its practical implementation for societal well-being. In a new program termed as 'IEEE Direct to Students'(D2S) we try to lessen the gap by involving college and high school students, and young professionals. D2S aims to empower rural...

Infrared thermography (IRT) has been one of the most-effective condition-based maintenance (CBM) methods in determining the condition of a component or a system. Using such method in addition to vibration monitoring, chemical monitoring, and other electrical techniques, a set of information can be obtained which is used in predicting the life span...

(Available at http://vixra.org/abs/1401.0061) In the past decade, research on the philosophy and the development of artificial moral agents (AMAs) have increased in order to seek for the implementation of moral decision-making faculties basically in machines—computers, robots, etc. Because of this, ethical reasoning becomes one of the primary chall...

The purpose of this note is to give an idea for graph theorists to explore a connection between communication channels and graph theory as indicated in our conjectures below. 1. Definitions From this point, we define graph as follows: Definition 1. A graph is said to be super complete of order n, i.e. K n , if and only if 1. the graph is K n comple...

Real objects in general are fractional-order (FO) systems, although in some types of systems the order is very close to integer order (IO). Since major advances have been made in the theory and practice of the identification of FO controlled objects and in the design of FO controllers, it is possible to consider also the real order of the dynamical...

(Presented at the DLSU CT Congress in December 2013 at De La Salle University Manila) In this study, modeling of the elevator machine room in Yuchengco Building of De La Salle University was discussed. The said room was divided into six different zones and that each zone was assumed to be represented by a first-order dynamical model. In addition to...

The number of studies on the control of fractional-order processes—processes having dynamics described by differential equations of arbitrary order—has been increasing in the past two decades and it is now ubiquitous. Various methods have emerged and have been proven to effectively control such processes—usually resulting in fractional-order contro...

As it results from many research works, the majority of real dynamical objects are fractional-order systems, although in some types of systems the order is very close to integer order. Application of fractional-order models is more adequate for the description and analysis of real dynamical systems than integer-order models, because their total ent...

Proportional-Integral-Derivative (PID) controllers have been the heart of control systems engineering practice for decades because of its simplicity and ability to satisfactory control different types of systems in different fields of science and engineering in general. It has receive widespread attention both in the academe and industry that made...

Real objects in general are fractional-order (FO) systems, although in some types of systems the order is very close to integer order (IO). Since major advances have been made in the theory and practice of the identification of FO controlled objects and in the design of FO controllers, it is possible to consider also the real order of the dynamical...

Linear passive and active electric circuits can be viewed as two-port networks - having two readily-accessible electrical terminals usually denoted as input and output ports. Two-port networks, also known as four-terminal networks, are usually represented using matrices which allow the network to be analyzed easily without getting through internal...

Work capacity models are very important tool in profiling a person against a defined set of competencies usually related to knowledge and skills, and the person's physical and behavioral characteristics and constraints. In the case of an engineering student, for example, these set of competencies may be defined by a mentor or adviser such as, but a...

A great deal of modern methods for investigation, monitoring and control of the processes in the area of mining and processing of earth resources utilize approaches based upon modeling of these processes using the mathematical or physical models. As it results from the last research works, majority of the real processes in general are fractional-or...

Real objects in general are fractional-order (FO) systems, although in some types of systems the order is very close to an integer order. Also application of FO models is more adequate for the description of dynamical systems than integer-order models. This paper is devoted to the analogue electronic realization of the FO systems, e.g. controlled o...

The introduction of fractional calculus has spurred a lot of possibilities in biomedical engineering and bioengineering research and development, especially in the modeling, design, and analysis of bioelectrodes. With the advent of memristors and fractional calculus, it is seen that these concepts would have several advantages and applications in s...

Real objects in general are fractional-order systems, although in some types of systems the order is very close to an integer order. Since major advances have been made in this area in the last decades, it is possible to consider also the real order of the dynamical systems by using fractional order of the differential equations. Such models are mo...

1 5/2010 www.strojarstvo.sk Metódy na riešenie Metódy na riešenie Metódy na riešenie Metódy na riešenie diferenciálnych rovníc neceločíselné-ho rádu pre simulačné účely TEXT: prof. pokro-ky v danej oblasti, je možné zohľadňovať reálny rád aj pri popise dynamických systémov použitím diferenciálnych rovníc neceločíselného rádu. V takých prípadoch sú...

Control systems engineering has been part of every engineering field. Whether in electrical, electronic, computer, mechanical, or chemical engineering, control systems play a relevant part both in the academe and in the industry. Thus, there is a big need to develop strategies which will help undergraduate and graduate students of engineering learn...

In this paper, we present a new model that predicts forest fire spreading based on two-dimensional square cellular automata (2DS-CAs). The model presented is an extension of the models developed by [6] and [9], which are basically based on the transfer of fractional burned area. The main contribution of this paper is the development of a local tran...

The known formula () [ ] 1 1 / Tr N N λ = A , where A is an n n × Hermitian matrix, 1 λ is its dominant eigenvalue and N is a sufficiently large positive integer, is given the modification () 1 1 / Tr N N λ = A. This modification is conjectured to apply to any n n × matrices, whether Hermitian or not and is converted into an algorithm for obtaining...

This paper presents the design of an autonomous mobile olfactory robot that is capable of locating the source of a simulated chemical leak in an environment while detecting and avoiding obstacles along its path, by using two chemical sensors and proximity detectors. This paper discusses the autonomous mobile olfactory robot (AMOR) from the design c...

It has been a practice in control system design to provide certain means of control in any control system by using different techniques such as adding compensators like PI, PD, and PID, with the incorporation of machine intelligence techniques such as fuzzy logic, artificial neural networks, and evolutionary computation. This paper presents a desig...

User congestion has become a problem in the utilization of the communications bandwidth. Some users are not able to send a message data or call because of the overwhelming ratio between the subscribers and the frequency slots available at a certain time. In this paper, a simulation of signal separation using a Multiple-input Multiple-output (MIMO)...