Performing fine manipulations with multifingered robot hands makes high demands on the control algorithms and the speed of the control computer. Mainly nonlinear friction problems and plant uncertainties require inten...
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Performing fine manipulations with multifingered robot hands makes high demands on the control algorithms and the speed of the control computer. Mainly nonlinear friction problems and plant uncertainties require intensive fine-tuning of a controller. This paper gives insight into the frictional behaviour of geared finger links. The behaviour has been approximated by a friction model. Considering the estimated system parameters two kinds of controllers are developed: a simple PD controller with switchable I-part and a PD-controller with a fuzzy friction compensation working in parallel. The results of both controllers are presented and compared in this paper.
In this paper,the problem of time varying telecommunication delays in passive teleoperation systems is *** design comprises delayed position,velocity and position-velocity signals with the local position and velocity ...
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In this paper,the problem of time varying telecommunication delays in passive teleoperation systems is *** design comprises delayed position,velocity and position-velocity signals with the local position and velocity signals of the master and slave *** adaptive control terms are employed locally to cope with uncertain parameters associated with the gravity loading vector of the master and slave ***-Krasovskii function is employed for three methods to establish asymptotic tracking property of the closed loop teleoperation *** stability analysis is derived for both symmetrical and unsymmetrical time varying delays in the forward and backward communication channel that connects the local and remote ***,evaluation results are presented to illustrate the efectiveness of the proposed design for real-time applications.
During the development and maintenance of software, the size of a test suite often increases to such an extent that the costs allocated for its execution are exceeded. In this case, the test suite needs to be reduced....
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With high speed control applications it is often very difficult to achieve the aspired timing of the control algorithm using just one processor. This is true especially if the system is complex or very large. In this ...
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With high speed control applications it is often very difficult to achieve the aspired timing of the control algorithm using just one processor. This is true especially if the system is complex or very large. In this paper we discuss advantages and disadvantages of a new system architecture using many processors of which each one is specialised for one part of the algorithm. A tailorable parallel computer architecture which we developed to cope with the problems of parallelisation of control algorithms is presented. Finally examples from the field of robotics and the performance of the prototype computer is presented.
In the past decades, embedded system designers moved from simple, predictable system designs towards complex systems equipped with caches. This step was necessary in order to bridge the increasingly growing gap betwee...
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In contrast to a hierarchical and centralized structure, distributed or decentralized control architectures reveal their main advantages when it is necessary to enhance the system, to integrate components, and to main...
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In contrast to a hierarchical and centralized structure, distributed or decentralized control architectures reveal their main advantages when it is necessary to enhance the system, to integrate components, and to maintain the system. The main disadvantage of not centralized architectures is having to make sure that the system will fulfill an overall or global goal. To investigate these problems, a distributed control architecture for intelligent systems was developed at the University of Karlsruhe. In this paper, the methods for dead-lock-free coordination and cooperation are explained.
A new product model that is particularly useful for model-based assembly planning is presented in this paper. The majority of the models used in this domain are simple approximations of the real workpiece and they are...
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A new product model that is particularly useful for model-based assembly planning is presented in this paper. The majority of the models used in this domain are simple approximations of the real workpiece and they are often dedicated to special algorithms. The model described here provides a more accurate and more flexible representation of workpieces. An increase in accuracy of the shape description was achieved by enhancing a polyhedral model with an analytical representation. The application of the model is demonstrated within the framework of assembly sequence planning.
This text presents an approach for planning robot workcells in three dimensions fully automatically. This automation is possible by a complete layout planning process inside the configuration space. To reach a suffici...
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This text presents an approach for planning robot workcells in three dimensions fully automatically. This automation is possible by a complete layout planning process inside the configuration space. To reach a sufficient shop floor layout in a short time, the cartesian configuration space and fast obstacle transformation routines are employed. An optimization algorithm minimizes the length of all collision free paths required for the performance of the workcell task. A final check by a graphical workcell task simulation, whether the layout is valid or not, is no longer required. This new planning approach enhances the conventional layout planning process and reduces the amount of necessary user interaction.
Large-scale complex embedded systems pose unique problems. To reduce overall development times, there is a need to develop the system in a concurrent fashion, involving the development and verification of software at ...
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Large-scale complex embedded systems pose unique problems. To reduce overall development times, there is a need to develop the system in a concurrent fashion, involving the development and verification of software at the same time as designing, building and verifying the hardware. This requires a two-phase trade-off analysis approach to the hardware software co-design problem. The first phase is platform independent: it allows system requirements to be met and also supports other important objectives, e.g. scalability, upgradeability. The results of the first phase include deriving requirements and design constraints placed on the platform dependent phase (eg. resource budgets including time). The second, platform dependent phase, chooses the actual software and hardware implementation that satisfies the requirements derived in phase 1. This paper addresses the first part of the problem through trade-off analysis. This establishes the design decisions in a traceable manner whilst capturing the rationale and assumptions made. It then searches the design space for the solution that best meets the system's objectives. The approach has been developed for the needs of critical systems and has already been applied to the logical design of systems.
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