This paper proposes the improvement of eccentric power presser dynamic by using variable speed in... more This paper proposes the improvement of eccentric power presser dynamic by using variable speed induction motor drives. For this study, the power presser and the motor control schemes have been modeled and simulated using the Matlab -Simulink software. Two control schemes are investigated: Volt-Hertz and Direct Torque Control. A brief on the operation principle and the Simulink models of each control scheme is presented. The comparative graphical results can illustrate their effect on the power presser dynamics.
This paper presents an experimental vehicle that was realized for testing the electric propulsion... more This paper presents an experimental vehicle that was realized for testing the electric propulsion system and for research concerning the system energy management. There are presented the vehicle structure, its functionality and a special built monitoring system. The monitoring system is able to on-line display the specific quantities during tests and to automatically build a measurement data base for various operating conditions, which is meant to be used for research on energy management optimization.
Direct Torque Control (DTC) is a high performance control technique introduced for voltage invert... more Direct Torque Control (DTC) is a high performance control technique introduced for voltage inverter fed induction motor drives. This technique, based on selecting the optimum stator voltage vector of the inverter standard topology, makes the torque and stator flux ...
Optimal command of aircrafts' move using a reduced order observer
Proceedings of the 9th …, 2008
Page 1. Optimal Commnad of Aircrafts' Move Using a Reduced Order Observer LUNGU MIHAI Avioni... more Page 1. Optimal Commnad of Aircrafts' Move Using a Reduced Order Observer LUNGU MIHAI Avionics Department University of Craiova, Faculty of Electrotechnics Blv. Decebal, No.107, Craiova, Dolj ROMANIA LUNGU ROMULUS ...
Starting from a non-linear description of the longitudinal move of aircrafts with big incidence a... more Starting from a non-linear description of the longitudinal move of aircrafts with big incidence angles, in this paper one makes an identification structure for the model's unknown parameters using the second method Liapunov algorithm. One also presents the simulation program and a characteristics family obtained with this program. These express state variables' variation in time as response of the system to longitudinal command of the aircraft and identification errors variation. The simulation result differ from the ones obtained by others authors in papers.
Abstract:- The subject of this paper is a study of the influence of the inertial sensors errors o... more Abstract:- The subject of this paper is a study of the influence of the inertial sensors errors on the position, speed and attitude of a bidimensional strap-down inertial navigation system in a horizontal plane. The MATLAB/SIMULINK models used for the acceleration and rotation sensors are based on the sensors data sheets and on the IEEE equivalent models for the inertial sensors. The models can be used in the numerical simulation of the strap-down inertial navigation system, close by real conditions from the point of view of the distortions suffered by the useful acceleration and rotation signals at the passing through any type of accelerometers or gyros desired to be implemented in the navigator. These models have the advantage to work independent from each of the sensors ’ errors and thus to study their influence on the inertial navigator.
STEFAN GHEORGHE Politehnica University of Bucharest ROMANIA [email protected] MIRCEA COVRIG P... more STEFAN GHEORGHE Politehnica University of Bucharest ROMANIA [email protected] MIRCEA COVRIG Politehnica University of Bucharest ROMANIA [email protected] GRIGORE DANCIU Politehnica University of Bucharest ROMANIA COSTIN CEPISCA ...
This work analyses the operation of inverter-fed asynchronous motor drives accompanied by highfre... more This work analyses the operation of inverter-fed asynchronous motor drives accompanied by highfrequency interferences caused by parasitic currents of the common and differential modes. These emissions propagated by conduction and radiation may unfavorably affect the operation of nearby telecommunication and signal cables and various low-current devices. The study of these phenomena is based on theoretical considerations and numerical analysis.
The principles of the minimum dissipated power are extremely important in the analysis of electri... more The principles of the minimum dissipated power are extremely important in the analysis of electrical circuits, and represent the equilibrium state of all the circuit.. For demonstrate these principles, in the present work, a power functional is built for a circuit in steady-state conditions and its limit is determined. It is shown that the minimum of this functional corresponds to the minimum dissipated power in the circuit. Some applications to electric linear and nonlinear circuits are shown.
The paper presents a new algorithm for optimal control law's synthesis in rapport with state vect... more The paper presents a new algorithm for optimal control law's synthesis in rapport with state vector of the aircraft's move. Starting from state equation of the movement, the system is brought to Jordan canonic form and Riccati algebraic matricidal equation (whose solution is the gain matrix of the control law) is brought to an equivalent form with transformation relation. The new gain matrix is partitioned conform to equations (35) ÷ (40). Using ALGLX algorithm, one studies elastic no deformed (no dimensional description) longitudinal and lateral move of an aircraft and dimensional elastic deformed move. One obtained Matlab/Simulink models and numerical programs and with them time characteristics expressing state variables' dynamic are obtained.
The subject of this paper is a study of the influence of the inertial sensors errors on the posit... more The subject of this paper is a study of the influence of the inertial sensors errors on the position, speed and attitude of a bidimensional strap-down inertial navigation system in a horizontal plane. The MATLAB/SIMULINK models used for the acceleration and rotation sensors are based on the sensors data sheets and on the IEEE equivalent models for the inertial sensors. The models can be used in the numerical simulation of the strap-down inertial navigation system, close by real conditions from the point of view of the distortions suffered by the useful acceleration and rotation signals at the passing through any type of accelerometers or gyros desired to be implemented in the navigator. These models have the advantage to work independent from each of the sensors' errors and thus to study their influence on the inertial navigator.
Currently, stress is one of the main factors which causes most physical and mental illnesses. It ... more Currently, stress is one of the main factors which causes most physical and mental illnesses. It has become part of our everyday life and is considered a physiological response to different physical, emotional or mental challenges causing the occurrence of discomfort states, tension or even of the burn-out syndrome. Since in every day of our lives all activities are carried out under the influence of a higher or lower level of stress, we decided to investigate the daily stress experienced by ordinary people, during typical days of their lives, by using an acquisition and quantification system. The current paper aim is to investigate the stress level of a group of patients during a word colour test by testing these patience’s ability to concentrate, in both resting and under stress conditions, using a simple and easy to implement acquisition and quantification system. Our primary goal is to achieve conclusive results to demonstrate the impact of stress on health both on the short and long-term and to make the population more aware of the harmful lifestyle it has the impact of any type of stress on our health. 'Prevention is better than cure.'
This paper proposes the improvement of eccentric power presser dynamic by using variable speed in... more This paper proposes the improvement of eccentric power presser dynamic by using variable speed induction motor drives. For this study, the power presser and the motor control schemes have been modeled and simulated using the Matlab -Simulink software. Two control schemes are investigated: Volt-Hertz and Direct Torque Control. A brief on the operation principle and the Simulink models of each control scheme is presented. The comparative graphical results can illustrate their effect on the power presser dynamics.
This paper presents an experimental vehicle that was realized for testing the electric propulsion... more This paper presents an experimental vehicle that was realized for testing the electric propulsion system and for research concerning the system energy management. There are presented the vehicle structure, its functionality and a special built monitoring system. The monitoring system is able to on-line display the specific quantities during tests and to automatically build a measurement data base for various operating conditions, which is meant to be used for research on energy management optimization.
Direct Torque Control (DTC) is a high performance control technique introduced for voltage invert... more Direct Torque Control (DTC) is a high performance control technique introduced for voltage inverter fed induction motor drives. This technique, based on selecting the optimum stator voltage vector of the inverter standard topology, makes the torque and stator flux ...
Optimal command of aircrafts' move using a reduced order observer
Proceedings of the 9th …, 2008
Page 1. Optimal Commnad of Aircrafts' Move Using a Reduced Order Observer LUNGU MIHAI Avioni... more Page 1. Optimal Commnad of Aircrafts' Move Using a Reduced Order Observer LUNGU MIHAI Avionics Department University of Craiova, Faculty of Electrotechnics Blv. Decebal, No.107, Craiova, Dolj ROMANIA LUNGU ROMULUS ...
Starting from a non-linear description of the longitudinal move of aircrafts with big incidence a... more Starting from a non-linear description of the longitudinal move of aircrafts with big incidence angles, in this paper one makes an identification structure for the model's unknown parameters using the second method Liapunov algorithm. One also presents the simulation program and a characteristics family obtained with this program. These express state variables' variation in time as response of the system to longitudinal command of the aircraft and identification errors variation. The simulation result differ from the ones obtained by others authors in papers.
Abstract:- The subject of this paper is a study of the influence of the inertial sensors errors o... more Abstract:- The subject of this paper is a study of the influence of the inertial sensors errors on the position, speed and attitude of a bidimensional strap-down inertial navigation system in a horizontal plane. The MATLAB/SIMULINK models used for the acceleration and rotation sensors are based on the sensors data sheets and on the IEEE equivalent models for the inertial sensors. The models can be used in the numerical simulation of the strap-down inertial navigation system, close by real conditions from the point of view of the distortions suffered by the useful acceleration and rotation signals at the passing through any type of accelerometers or gyros desired to be implemented in the navigator. These models have the advantage to work independent from each of the sensors ’ errors and thus to study their influence on the inertial navigator.
STEFAN GHEORGHE Politehnica University of Bucharest ROMANIA [email protected] MIRCEA COVRIG P... more STEFAN GHEORGHE Politehnica University of Bucharest ROMANIA [email protected] MIRCEA COVRIG Politehnica University of Bucharest ROMANIA [email protected] GRIGORE DANCIU Politehnica University of Bucharest ROMANIA COSTIN CEPISCA ...
This work analyses the operation of inverter-fed asynchronous motor drives accompanied by highfre... more This work analyses the operation of inverter-fed asynchronous motor drives accompanied by highfrequency interferences caused by parasitic currents of the common and differential modes. These emissions propagated by conduction and radiation may unfavorably affect the operation of nearby telecommunication and signal cables and various low-current devices. The study of these phenomena is based on theoretical considerations and numerical analysis.
The principles of the minimum dissipated power are extremely important in the analysis of electri... more The principles of the minimum dissipated power are extremely important in the analysis of electrical circuits, and represent the equilibrium state of all the circuit.. For demonstrate these principles, in the present work, a power functional is built for a circuit in steady-state conditions and its limit is determined. It is shown that the minimum of this functional corresponds to the minimum dissipated power in the circuit. Some applications to electric linear and nonlinear circuits are shown.
The paper presents a new algorithm for optimal control law's synthesis in rapport with state vect... more The paper presents a new algorithm for optimal control law's synthesis in rapport with state vector of the aircraft's move. Starting from state equation of the movement, the system is brought to Jordan canonic form and Riccati algebraic matricidal equation (whose solution is the gain matrix of the control law) is brought to an equivalent form with transformation relation. The new gain matrix is partitioned conform to equations (35) ÷ (40). Using ALGLX algorithm, one studies elastic no deformed (no dimensional description) longitudinal and lateral move of an aircraft and dimensional elastic deformed move. One obtained Matlab/Simulink models and numerical programs and with them time characteristics expressing state variables' dynamic are obtained.
The subject of this paper is a study of the influence of the inertial sensors errors on the posit... more The subject of this paper is a study of the influence of the inertial sensors errors on the position, speed and attitude of a bidimensional strap-down inertial navigation system in a horizontal plane. The MATLAB/SIMULINK models used for the acceleration and rotation sensors are based on the sensors data sheets and on the IEEE equivalent models for the inertial sensors. The models can be used in the numerical simulation of the strap-down inertial navigation system, close by real conditions from the point of view of the distortions suffered by the useful acceleration and rotation signals at the passing through any type of accelerometers or gyros desired to be implemented in the navigator. These models have the advantage to work independent from each of the sensors' errors and thus to study their influence on the inertial navigator.
Currently, stress is one of the main factors which causes most physical and mental illnesses. It ... more Currently, stress is one of the main factors which causes most physical and mental illnesses. It has become part of our everyday life and is considered a physiological response to different physical, emotional or mental challenges causing the occurrence of discomfort states, tension or even of the burn-out syndrome. Since in every day of our lives all activities are carried out under the influence of a higher or lower level of stress, we decided to investigate the daily stress experienced by ordinary people, during typical days of their lives, by using an acquisition and quantification system. The current paper aim is to investigate the stress level of a group of patients during a word colour test by testing these patience’s ability to concentrate, in both resting and under stress conditions, using a simple and easy to implement acquisition and quantification system. Our primary goal is to achieve conclusive results to demonstrate the impact of stress on health both on the short and long-term and to make the population more aware of the harmful lifestyle it has the impact of any type of stress on our health. 'Prevention is better than cure.'
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