One of the most costly equipment in electrical power systems are the High Voltage Power Transformers (HVPT). Faults and failures for these equipments does not only cause repair cost, furthermore economic losses occur ...
详细信息
One of the most costly equipment in electrical power systems are the High Voltage Power Transformers (HVPT). Faults and failures for these equipments does not only cause repair cost, furthermore economic losses occur due to interruptions in consumers' energy supply. Preventive tests and on-line monitoring are used to predict incipient fault conditions, and to schedule outage maintenance and retirement of the transformers. This paper presents a survey on various approaches on monitoring and fault detection of electrical power transformers used to optimize maintenance techniques. This optimization is not possible without a correct fault diagnosis besides critical components and common failure modes knowledge.
The article presents an experimental realized solution for the wireless control of the autonomous vehicles. The specific feature of the solution consists in using an access point embarked on the vehicle, which provide...
详细信息
The article presents an experimental realized solution for the wireless control of the autonomous vehicles. The specific feature of the solution consists in using an access point embarked on the vehicle, which provides the transmission of the commands given by the user from a keyboard connected to a personal computer, using API, as well as the reception of the information supplied by the sensors placed on the mobile robot. The set of sensors offers proprioceptive information (reference to the position, orientation and the speed of the vehicle, to which it is also added the information relative to the good functioning) and exteroceptive information (reference to the environment) in an advantageous manner, giving the perspectives for the realization of the sensorial fusion.
The paper presents a control system for mobile robots. The teleoperation controller has a modular architecture and includes interprocess communications, localization, map building, safeguarding, sensor management, and...
详细信息
The paper presents a control system for mobile robots. The teleoperation controller has a modular architecture and includes interprocess communications, localization, map building, safeguarding, sensor management, and speech synthesis. The controller supports varying degrees of cooperation between the operator and robot, from direct to supervisory control. The authors of this article presents an new approach of robot control architecture which is not represented in other papers.
On-off control is still widely used in the industry, especially for discontinuous actuators, e.g. compressors, steam turbines or furnace burners. Exact set-point control is not possible by an on-off controller. Lower ...
详细信息
ISBN:
(纸本)9783902661661
On-off control is still widely used in the industry, especially for discontinuous actuators, e.g. compressors, steam turbines or furnace burners. Exact set-point control is not possible by an on-off controller. Lower and upper limits are defined for the control signal which should not be violated. For this predictive gap control quadratic and horizon dependent cost functions are defined. Traditional numerical optimization fails with longer prediction horizons, but a genetic algorithm can be effectively applied even for long horizons.
The paper establishes a non-variational procedure in order to obtain the solution to an optimal control problem. The optimal control refers to a quadratic criterion with finite final time, regarding a time-variant lin...
详细信息
The paper establishes a non-variational procedure in order to obtain the solution to an optimal control problem. The optimal control refers to a quadratic criterion with finite final time, regarding a time-variant linear system, for continuous and discrete time cases. The proposed solution is more convenient for implementation by comparison with the classical ones. The indicated optimal controller is advantageous especially in the time-invariant case. New solutions to Riccati differential / difference equations are also presented.
Abstract On-off control is still widely used in the industry, especially for discontinuous actuators, e.g. compressors, steam turbines or furnace burners. Exact set-point control is not possible by an on-off controlle...
详细信息
Abstract On-off control is still widely used in the industry, especially for discontinuous actuators, e.g. compressors, steam turbines or furnace burners. Exact set-point control is not possible by an on-off controller. Lower and upper limits are defined for the control signal which should not be violated. For this predictive gap control quadratic and horizon dependent cost functions are defined. Traditional numerical optimization fails with longer prediction horizons, but a genetic algorithm can be effectively applied even for long horizons.
Particular interest is presently focused on the full electric direct propulsion systems for the improvement of reliability and reduction of noise. A transverse flux permanent magnet (TFPM) machine with high pole-numbe...
详细信息
Similar to the shape description using Mexican Hat Wavelet functions we present in this paper the derivation of object descriptors using Haar Wavelets. The derivation is based on the continuous wavelet transformation ...
详细信息
ISBN:
(纸本)1424417511
Similar to the shape description using Mexican Hat Wavelet functions we present in this paper the derivation of object descriptors using Haar Wavelets. The derivation is based on the continuous wavelet transformation of an angle function using the Haar function as mother wavelet. The angle function which represents a given object shape is derived from the extracted contour polygon by computing the angle differences between the angles at every position on the contour and the angle at the starting point. This angle function is periodical but with 2 offset and can be normalized in order to be independent of the object's size, it's position and orientation. The angle function depends only on the starting point on the given contour. Moreover, the used angle function doesn't include any singularity which might arise due to object rotations. The derived Wavelet descriptors were used in an agricultural application to recognize weed species. The paper presents in this context some derived results as well as possible solution for the problem of starting point.
The paper addresses the problems of impulsive noise detection for audio signals. A structure of threshold parameter detectors using modeling of signal was introduced. The algorithm: of noise detection, based on discre...
详细信息
Wheelchair on two wheels is an interesting and challenging control problem. The challenge is in the design and implementation of suitable control strategies for a two wheeled wheelchair to perform comparably similar t...
详细信息
ISBN:
(纸本)9780889867116
Wheelchair on two wheels is an interesting and challenging control problem. The challenge is in the design and implementation of suitable control strategies for a two wheeled wheelchair to perform comparably similar to normal four wheeled wheelchair. A wheelchair on two wheels is expected not to take much space during mobility as compared to when it is on four wheels. Moreover, disabled people are encouraged and expected to do most things that others can do and hence lead an independent life. Thus, wheelchairs on two wheels are needed for disabled persons to perform some of the essential tasks in their living and work environments. In this research a model of the standard wheelchair is developed as a test and verification platform using Visual Nastran software. Novel fuzzy logic control strategies are designed for lifting up the chair and maintaining stability and balance while on two wheels. Simulation results of the proposed control strategy are presented and discussed.
暂无评论