Abstract The paper studies the influence of human factor and clinical constraints specific to mechanical devices for medical purpose. environment (with a limited workspace, inside or outside the patient body). A medical robot is usually a complex system including mechanical structure, human-machine interface (HMI), electronic components, and software controller. All these components are integrated to perform various tasks for daily medical applications. Because any failure may become very critical, medical robots must function safely and with high reliability, so that designing medical robots for safe human interaction can be considered a real challenge. In order to respect the clinical constrains, a safety real-time controller has been designed.

Inthis paper many improvements in dealing with energy quality issues that could arise in electrical drive systems using asynchronous machines are presented. A series active power filter is used in electrical drive systems with induction motors to reduce harmonic current and voltage. We also propose a variety of active power filters with hysteresis current value control. Lastly, some experimental results for an electrical drive system utilizing an induction motor and a PWM converter are provided. These findings are followed by a discussion of the system's energy quality issues.

This paper aims to simulate an electric drive system with synchronousxmotor withxpermanentxmagnets, controlled by the field orientation method. Permanentxmagnet synchronousxmotors (PMSM) are successfullly used in small and medium powerxapplications, as a modern and perspective solution for adjustable speed drives. The mathematicalxmodel of the synchronous motor with permanent magnets was obtained by using Park's direct and inverse transforms. Within this work, a system with PI regulator on the speed control loop is designed, which allows to run at constant torque and with field weakening portions. Finally, usink Simulink the results of the simulation of a permanentxmagnetxsynchronous motor system, controlledxby the field orientation method, as well as an application of these motors to hybrid electric vehicles are presented.

This paper presents an application that uses the Jury stability criterion to determine if a system is stable or unstable. The software application described, in this paper, is based on a MATLAB script. With this application it can easily establish the fulfillment of stability conditions from Jury criterion.

The dependable systems behaviour builds the establishment for trustworthiness in any significant achievements in the information society. The dependability of a system is endangered if faults and failure in components of the system occur, being the cause for errors which can lead to consequent failure. Unexpected events, unavailability of equipment, instantaneous component failures, stoppage of automated equipment are unacceptable accidents that increasingly impacting the quality of life of persons and the quality of services in global society. The paper proposes a framework to evaluate the unavailability of the dependable systems using Fuzzy Multi-Stage Analysis. The method examines the importance factors of modelled system and the scenarios which can develop as a result of incidence of multiple, discrete events. The case of study, developed for realtime, operational conditions, validates, analytically, experimentally and by simulation, the efficiency of proposed method.

In three-phase electrical circuits (distribution electrical networks for alimentation with electrical energy), the non-symmetric situation may be characterized by the existence of negative and zero symmetric order components of the current, which have a bad influence on the efficiency of energy. One of the explanation is the instantaneous power flow of negative and zero components, as it is analyzed and explained in this paper. On symmetric situation, only the positive sequence component exists. Finally some simulation results are presented and also the experimental values, which were measured with ACE2000 device in electrical station for trams supplying trams with electrical energy.

The paper presents the mathematical realization of the trajectory that the colonoscope should have in the medical intervention, as well as the mathematical demonstration of the functions that make up the colonoscope. The goal of this work is finding a method for reducing the medical doctor's effort, by using intelligent control of colonoscope movement for improving the comfort of the patient subjected to a classical colonoscopy and reducing the risk of perforation of the colon. Finally, some experimental results are presented, validating the model and the control solutions adopted in the paper.

Abstract The analyses concerning an electric consumer may consist in determination of several components of electric current, injected by this consumer, in the electric network. Regarding sequence negative and sequence zero components of electric current, the unbalanced electrical consumer is the cause of its presence. Regarding harmonic components of electric current, the non-linear consumer is the cause of its presence. The efficiency about electric energy consumption may be characterized by the values of those components; the paper describes several considerations regarding those components of electrical current and its flow.

In this paper, a MATLAB-SIMULINK-based model for the Well Station from the Geothermal Plant at the University of Oradea is developed. The Well Station component is in charge for producing (extracting) geothermal water that should be used for heating purposes in the university campus. This paper presents the development of the dynamic model of the Well Station that includes also a control strategy based on a classical PI controller. The main purpose of the implementation is to create a model that could be used further to analyze and verify how the Well Station system is adapting at different consumption variations in order to support decisions regarding later possible modifications in the Geothermal Plant system. Simulation results are presented in the end, validating the model and the control solutions adopted in the paper.

The analyses concerning an electric consumer may consist in determination of several components of electric current, injected by this consumer, in the electric network. Regarding sequence negative and sequence zero components of electric current, the unbalanced electrical consumer is the cause of its presence. Regarding harmonic components of electric current, the non-linear consumer is the cause of its presence. The efficiency about electric energy consumption may be characterized by the values of those components; the paper describes several considerations regarding those components of electrical current and its flow.

Interpolate algorithms of numerical differential analyse, named in this paper ADNIA, may be implemented in purpose to generate a complex trajectory of industrial robots tool point. Considering the position matrix of an industrial robot, the linear or the circular ADNIA, according with linear or circular trajectory, may be implemented for interpolating the position vector: p⃗. The circular algorithm may be used for interpolate the orientation versors: n⃗, o⃗, a⃗. Those are the proposed computation algorithms and will be describe in this paper. The purpose of the described method is the value of position matrix elements, about a robotic arm.

This paper presents a dynamic regime analysis of the starting and function of the two-phase asynchronous motor with two non-orthogonal stator windings. Simulation results are obtained when the axis of the auxiliary winding is moved with 30 degrees in decreasing and increasing way. The answer concerning optimal choice of the two-phased motor for household applications is given by the results of the dynamic analysis.

This paper describes a control system architecture for cement milling that uses a control strategy that controls the feed flow based on Fuzzy Logic for adjusting the fresh feed. Control system architecture (CSA) consists of: a fuzzy controller, Programmable Logic Controllers (PLCs) and an OPC (Object Linking Embedded for Process Control) server. The paper presents how a fuzzy controller for a cement mill is designed by defining its structure using Fuzzy Inference System Editor [1]. Also, the paper illustrates the structure of the implemented control system together with the developed PLC program and its simulation. Finally, the dynamic behavior of the cement mill is simulated using a MATLAB-Simulink scheme and some simulation results are presented.

Non-linear control systems stability and as a particular case the stability of interpolative-type control structures (as fuzzy, neural or pure interpolative control systems) is an intensively studied problem, due to its multiple applicative valences. In the specialized literature there are some approaches regarding the fuzzy system stability [1]. Referring the control systems with interpolative controllers, there are just a few studies and the existing work is limited to the stability study of the interpolation method [3]. The present paper approaches a methodological procedure and the basic idea of a software tool for the stability analysis based on direct Liapunov method applied to control systems with fuzzy and interpolative controllers.

In electrical networks, the presence of non-symmetrical situation determines several effects. A consequence of non-symmetrical situations is the significant value of non-symmetry power. The computation of non-symmetry factor is a method for estimate the influence of non-symmetry power, in three-phase systems, (similar with estimation of reactive power influence by power factor value). The paper describes the computation procedure of non-symmetry factor, considering sequence components, (theorem Fortesque). The value of non-symmetry factor, as we describe, may characterize the non-symmetrical situations. Also, the paper analyzes the principle that sources of the negative and zero sequence components are the non-symmetric consumers.

This paper presents an application for cement milling system. In this application the process is controlled by software running on Programmable Logic Controllers. The appliance used to observe industrial process show the following mill parameters: feed rate, mill speed, transporters speeds, mill filling level, fan speed, circulating loads. The appliance monitors operations and process conditions and makes constant automatic adjustments necessary to stabilize the process flow, balance load between circuit equipment.

This paper presents an application for mill control. In this application a mill is controlled by software running on Programmable Logic Controllers. The paper handle a few topics from cement industry, such are: critical speed, mill speed control. If the peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back. Therefore, this application conceived a PID controller for control the mill speed, using Programmable Logic Controllers.

Induction machine with short circuited rotoris the simplest, robust and lowest cost electricalmachine.Existing experience regarding interconnectedwith the general electro energetic system micro hydroplants, already established the use in such cases ofsimple and economic hydro mechanical, electricitygenerating, control and automation equipment wascreated by that kind of machine. This paper illustratespossibilities of the hydro energy potential utilization forhydro power plants construction on the Bihor countyrivers , experiences on how to build and operate asmall hydropower , induction generators use andsustainable solutions for small hydropower by inBihor county, Romania.