In this paper, we propose a multi-agent architecture for industrial control process and its software realization. We discuss the concepts and necessity of Distributed Intelligent control (DIC) based on Distributed Art...
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In this paper we emphasize the importance of evaluating the intelligence level of intelligent controlsystems. We bring forward the idea that the evaluating system is composed of a three tier construction: organizing ...
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ISBN:
(纸本)9780780397989
In this paper we emphasize the importance of evaluating the intelligence level of intelligent controlsystems. We bring forward the idea that the evaluating system is composed of a three tier construction: organizing level, coordinating level and executive level, and we put the intelligence calculation in the organizing level. We also put forward the index system of the intelligence evaluating system of the ICS, which comprises 5 first grade indexes (I1), 17 second grade indexes (I2) and 52 third grade indexes (I3). And then, we give the formula to calculate the intelligent quality of the ICS. Finally we cite two examples to show the calculation of the ICS's intelligent quality.
In this paper, a new scheme for Wavelet-based Force Feed-Forward Automatic Gauge control (WFFF-AGC) based on multi-resolution decomposition using wavelets is proposed to improve the conventional Automatic Gauge Contro...
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Over the past 5 years, VEXTEC has developed a modeling tool set for analyzing variability at every product level. This is from the lowest level where physics of failure describes the process for fatigue crack initiati...
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ISBN:
(纸本)9781424400072
Over the past 5 years, VEXTEC has developed a modeling tool set for analyzing variability at every product level. This is from the lowest level where physics of failure describes the process for fatigue crack initiation and development within the material microstructure to the complex electronic interconnect, the electronic control unit (ECU), and finally to the overall vehicle system of ECUs. The oversimplification that every element within the system of ECUs has a constant failure rate is not assumed. In fact, no assumptions are made about failure rates. Physics of failure models are used to predict failure rates based on measured statistical variations. With the advent of the computer, the understanding of the physics of failure and how to apply it directly to electronics design has greatly improved. The vast array of computeraideddesign and manufacturing tools now in existence has enabled the simulation of physics for thermodynamics, fluid flow and structural analysis for example. Statistical measurements of manufacturing process control determine the statistical variations in the geometric dimensions and product material properties. Warranty records, customer surveys and built-in diagnostics are used to determine the statistical variation is how the product is used. These statistical distributions are combined with the physics of failure within VEXTEC's virtual representation of the electronics product to simulate the product's real world performance. Thus, reliability can be estimated while the product is still on the drawing board. This paper will discuss the various aspects that make up this new electronics design framework. The validation work that conveys the realities of this framework will be discussed as well as the future plans for implementation of this concept within everyday automotive design.
This paper addresses the problem of robust stability and stabilization of a class of nonlinear switched systems when each subsystem is not stabilized by a designed single static output feedback. Both the condition on ...
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A Tablet PC is a computer larger than a PDA and yet smaller than a notebook PC, which can't be equipped with a large battery due to the portability requirement of low weight. The machine state controls the power m...
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ISBN:
(纸本)1424402158
A Tablet PC is a computer larger than a PDA and yet smaller than a notebook PC, which can't be equipped with a large battery due to the portability requirement of low weight. The machine state controls the power management of a typical Tablet PC control of the hard disk, and various power on/off sequences for more than twenty sets of power supplies. In this paper, we propose a design using a low power embedded controller which can separately provide the different power sources necessary for different modules in order to reduce the total power consumption. Moreover, the embedded controller can receive the interrupt signal from users and restore the system state from SS (Suspend to disk) to So (Run-time state) and from S-3 (Suspend to RAM) to So. In our design, the current consumption of 3.08mA in the SS state not only may last more than 50 days but also is 370 times less than the 1150 mA at So state. Moreover, it only consumes 47 mA at S3. Later, we can even use a lower power version of the embedded controller, and then the design can prolong more of the idle time and sleeping time. Since the embedded controller is programmable, our design can easily fine tune the timing adjustment of the power on/off sequences and for compatibly matching the different version of motherboards. The fine tuning adjustment of the power on/off is based on the nest counters which generate several milliseconds of the time delays. For the different Tablet PC motherboard versions, we need only to modify the control program which is easily programmable and compatible with different chip sets and can easily port on different Tablet PCs.
This paper presents a decentralized control scheme, based on a recurrent neural identifier with a block control structure, and its application to robotics manipulators. A local jointcontroller is proposed for each jo...
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This paper presents a decentralized control scheme, based on a recurrent neural identifier with a block control structure, and its application to robotics manipulators. A local jointcontroller is proposed for each joint, using only local angular position and velocity measurements. These very simple local jointcontrollers allow trajectory tracking, with reduced computations. The applicability of the proposed scheme is illustrated, via simulations, first by the applications to a two degree of freedom robotic manipulator and then to a seven degree of freedom one.
This paper focuses on the joint space control of mechanical systems with electrohydraulic servos. Using mechanism inverse kinematics, desired Cartesian trajectories yield desired actuator trajectories, which are fed t...
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This paper focuses on the joint space control of mechanical systems with electrohydraulic servos. Using mechanism inverse kinematics, desired Cartesian trajectories yield desired actuator trajectories, which are fed to a novel model-based controller. Rigid body equations of motion and hydraulics dynamics, including friction and servovalve models are employed. The developed feedback controller uses the system dynamic and hydraulic model to yield servovalve currents. As an example, the developed controller is applied to a single degree-of-freedom (dof) servomechanism. Identification procedures employed in estimating the physical parameters of the experimental single dof servomechanism are discussed. In contrast to other approaches, here, force, pressure or acceleration feedback is not required. Simulations with typical desired trajectory inputs are presented and a good performance of the controller is obtained.
The progress made in friction compensation in robotics was concentrated on friction losses in the actuated joints. Today new mechanisms with a considerable number of passive joints, such parallel manipulators are emer...
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The progress made in friction compensation in robotics was concentrated on friction losses in the actuated joints. Today new mechanisms with a considerable number of passive joints, such parallel manipulators are emerging. This paper opens the discussion on the influence of passive joint friction (PJF) in robot's dynamics and its impact on control performance. It gives a basic framework on the modeling, detection and identification of such phenomena. All proposed methods pass on additional sensors and use only the actuators for detection and compensation. Due to its dependency on the robot's configuration, even small magnitudes of PJF can affect the system behavior, especially at unfavorable poses. To the best knowledge of the authors, the problem of PJF-compensation was not addressed systematically in literature yet
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