Digital feedback control of a full-bridge DC-DC converter, using a gain scheduled PI controller, is presented in this paper. Input voltage to the converter varies over a large range;as a result, controller gain design...
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ISBN:
(纸本)9781479943630
Digital feedback control of a full-bridge DC-DC converter, using a gain scheduled PI controller, is presented in this paper. Input voltage to the converter varies over a large range;as a result, controller gain designed for one particular input voltage may not give the optimum performance. Consequently, gain of the digital PI controller is made a function of the varying input voltage, and such a strategy leads to the system bandwidth and phase margin having a constant optimum value. this in turn gives a better transient response, both with changes in load as well as changes in input voltage. A low cost 16 bit PIC microcontroller, which has an inbuilt ADC and a PWM generation module, is used for implementing the proposed digital controller. the experimental results from a 50 W prototype have been provided to show the effectiveness of this control strategy.
Greenhouse production processes are heavily influenced by greenhouse climate conditions, as crop growth performance is directly influenced by these conditions. A solution to the problem of controlling the temperature ...
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Cloud computing is facing an increasing attention nowadays as it is present in many consumer appliances by advertising the illusion of infinite resources towards its customers. Nevertheless it raises severe issues wit...
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In a couple of decade there is many more technology that use brain signal as the control signal. One of this application is an input signal to a robot hand. Mu rhythm as the signal which associated with sensory motor ...
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ISBN:
(纸本)9781479971893
In a couple of decade there is many more technology that use brain signal as the control signal. One of this application is an input signal to a robot hand. Mu rhythm as the signal which associated with sensory motor activity will be used as the input signal. Moreover in this final project, there will be further explanation about the use of spatial filter and linear classifier to increase the performance of the controlled signal. the acqusition of mu rhythm will be firstly done by assuming the desired input channel which is done by the help of stimulus presentation a BCI2000 application. this assumed channel then analyze and act as an input for cursor task application. the spatial filter process was performed in this application and then the output of this spatial filter will be choosen as the input signal for cursor control signal in linear classifier, the performance of this classifier will be analyzed to increase its performance. the result showed that the implementation of the right spatial filter and the usage of linear classifier is necessary in order to acquiry and use mu rhythm as an input signal for BCI application. In addition it was found that the actual movement and imaginary movement produced a mu rhythm that could perform as an input for cursor task application.
this paper studies the algorithms for determining a BDS satellite's velocity using the broadcast ephemeri. Firstly, by taking the time derivatives of the Kepler orbit elements and the correction terms, the algorit...
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ISBN:
(纸本)9781479965755
this paper studies the algorithms for determining a BDS satellite's velocity using the broadcast ephemeri. Firstly, by taking the time derivatives of the Kepler orbit elements and the correction terms, the algorithm comprises close-form analysis formulas and the processing steps for directly computing a BDS satellite's instant velocity using the broadcast ephemeris is derived, and its validity is verified by test. Further, it is discussed on how the size of the differential time step affects the accuracy of the velocity results computed using the position differential algorithm. To investigate the suitable magnitudes of the differential time step, a comprehensive test is performed. In this test, several BDS satellites with different types were specially chosen and the real broadcast ephemeris was used to determine the velocity vectors both by the position differential algorithm and the direct algorithm, and the results were compared. the 12hr comparison test illustrates that the differential time step magnitude suitable for computing a BDS GEO satellite's velocity is 1s and the max residual is less than 0.0001mm/s. the differential time step suitable for a BDS MEO/IGSO Satellite is 100ms and the max residual is less than 0.001mm/s.
With increasing importance of exoskeletons as rehabilitation apparatuses, suitable and delicate control strategies has received much attention. In order to controlthe exoskeleton, there should be a complete understan...
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ISBN:
(纸本)9781479938551
With increasing importance of exoskeletons as rehabilitation apparatuses, suitable and delicate control strategies has received much attention. In order to controlthe exoskeleton, there should be a complete understanding of torques produced by the limb itself which makes the musculoskeletal modeling of the limb essential but also complex. In addition, the musculoskeletal model can be used to discover the user's desired movement to controlthe exoskeleton. In this paper a complete musculoskeletal model for the elbow with two degrees of freedom is developed and simulated. Next the model is used to determine user's desired movement. Finally based on this evaluation, an exoskeleton model is controlled by PD and Lyapunov-based controllers. the results show suitable resemblances between the control efforts of natural arm movement and the exoskeleton interfaced system.
the ability of NAO robot to play tic-tac-toe board game using its hands is greatly determined by the kinematics model of NAO's arms and the use of trajectory planning for manipulation tasks. In this paper, kinemat...
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ISBN:
(纸本)9781479971893
the ability of NAO robot to play tic-tac-toe board game using its hands is greatly determined by the kinematics model of NAO's arms and the use of trajectory planning for manipulation tasks. In this paper, kinematics models for NAO's upper body are presented. the forward kinematics models are designed by using the modified Denavit-Hartenberg convention. the inverse kinematics models of 5-joints NAO's arms are obtained by using analytical inverse transform technique in which provide unique and feasible solutions. the movement of NAO's arms while playing tic-tac-toe is constructed by using the proposed 3-Dimensional Cartesian Space trajectory planning method. the test result shows that the implemented trajectory planning method along with kinematics model are able to make NAO robot plays tic-tac-toe well by using its hands.
the development of railway cyber physical systems is a challenging process. In this paper we present our current effort to extend AADL to include new features for separation of concerns of railway cyber physical syste...
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Just as what the public pursue, we need a much safer railway system with a higher level of automation in control. To achieve this goal, the author aims to specify the Train controlsystem by formal methods which can s...
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Transmission systems are often subject to harmonic disturbances originating from transmission errors. these transmission errors cause non-desirable gear pair vibrations at mesh frequency that generate airborne sound. ...
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