the study of methods to control a collection of ferrous microparticles (microswarm) within an electromagnetic field is a branch of medical roboticsthat has many promising applications. To this date, most simulated da...
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ISBN:
(数字)9781665459730
ISBN:
(纸本)9781665459730
the study of methods to control a collection of ferrous microparticles (microswarm) within an electromagnetic field is a branch of medical roboticsthat has many promising applications. To this date, most simulated data is obtained from accurate but time-consuming simulations of which the biggest disadvantage is the removal of the human from the control loop. In practice a human in the loop will in many cases be controlling the microswarms. In order to re-introduce the human aspect into the control loop, this paper describes the development and validation of a real time simulator. By satisfying the real time requirement, we can record users interactions withthe microswarm in a similar way that the user would react with real world particles. the context of each simulation is for the user to direct a microswarm through a multi-bifurcation towards a selected outlet. the percentage of particles reaching the selected outlet is considered as the success metric. the model has been verified against previous experimental data. the platform showed 8% deviation from the experimental data. Parametric studies were then undertaken, providing an initial data set to analyse different real time articulation strategies. It was found that the fluid flow velocity made the most difference to the success of the user. With lower fluid flow velocities of 0.001m/s to 0.005m/s, close to 100% of particles reached the chosen outlet. this drops to around only 30% of particles reaching the chosen outlet at a fluid flow velocity of 0.25m/s. the other parameters particle size and capped magnetic force produced a much lesser variation in results, withthe maximum and minimum recorded numbers of particles reaching the chosen outlet for both tests only ranging 20% each. the platform, being generic, would also be appropriate as a training tool.
this paper describes the development, coordination, integration and control of a Flexible Manufacturing Cell (FMC). FMC has industrial characteristics and was developed to study these types of manufacturing systems. T...
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this conference proceedings contains 57 articles dealing with robot vision and sensory controls. Among the areas covered are: international perspectives in vision and sensing;Sensory Feedback;Mobile/Intelligent System...
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ISBN:
(纸本)0903608960
this conference proceedings contains 57 articles dealing with robot vision and sensory controls. Among the areas covered are: international perspectives in vision and sensing;Sensory Feedback;Mobile/Intelligent Systems;Sensor systems;Sensory controlled production;Multisensor systems;Advanced industrial systems;Software;Computer Vision;and Industrial applications of robotics.
the paper formulates an algorithm for searching the optimal temperature regime of the catalytic process in an ideal mixing reactor. the problem of optimal control of the catalytic process is formulated in a general fo...
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作者:
Tondu, B.Univ Fed Toulouse
Campus Rangueil F-31077 Toulouse France CNRS
LAAS Campus Rangueil F-31077 Toulouse France
Artificial pneumatic muscles, derived from the so-called McKibben muscle, are particularly popular for actuating robot joints with hybrid position/stiffness or torque/stiffness control. To be effective, such control m...
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ISBN:
(纸本)9781665408288
Artificial pneumatic muscles, derived from the so-called McKibben muscle, are particularly popular for actuating robot joints with hybrid position/stiffness or torque/stiffness control. To be effective, such control modes require an accurate static model of the actuator. While historical studies about the McKibben artificial muscle privileged a physical approach of static force F(P, epsilon) analysis versus bothcontrol pressure P and muscle length or contraction ratio epsilon, the recent marketing of Festo air muscle led to purely mathematical modeling approaches, especially in the form: F(P, epsilon)=f(epsilon)P-g(epsilon) with f, g positive and g(epsilon=0)=0. Such a form is particularly useful for static modeling of the actuator made of two antagonist artificial muscles. We provide a justification of this mathematical model based on a physical approach combining the classic theory of McKibben muscle, applied to a thick-walled inner tube, with a Neo-Hookean model of rubber elasticity. We developed a four parameter static model, that we applied to the popular Festo DMSP-20-400 air muscle, and to a hand-made McKibben muscle. According to this model, the f-component would derive from McKibben muscle theory, while the g-component could be interpreted as a purely resistive elastic force. Because this model uses a so-called C-1-coefficient determined empirically, we propose to call our approach: hybrid physical-empirical.
In this paper, we studied the attitude dynamics and control problem of a tethered space robot system, which are perturbed by a librational tether. First, the dynamics of the platform is developed with considering the ...
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ISBN:
(纸本)9781538670576
In this paper, we studied the attitude dynamics and control problem of a tethered space robot system, which are perturbed by a librational tether. First, the dynamics of the platform is developed with considering the librational tether. Secondly, a nonlinear disturbance observer is proposed based on attitude rate observations. Finally, a robust attitude controller is developed by using the disturbance observer an a PD controller, and the advantages from the proposed controller is demonstrated by numerical simulations.
Within the frame of the ESA project TAPAS (TAsk Planner for automation & robotics in Space), a generic scheduling tool has been developed. Its prime objective is to interactively assist a robot operator in plannin...
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ISBN:
(纸本)3540264132
Within the frame of the ESA project TAPAS (TAsk Planner for automation & robotics in Space), a generic scheduling tool has been developed. Its prime objective is to interactively assist a robot operator in planning and scheduling the activities of a robot-tended payload facility concurrently used by several (scientific) users, taking into account resources and various constraints. the system is potentially reusable in other space automation and robotics scenarios where this decentralised payload operations concept is applicable. One of the facilities analysed to establish the requirements was ERA, a robotic arm foreseen to be attached to the international Space Station. this abstract mainly gives an overview of the scheduling engine which is at the core of the software and constitutes its intelligence.
In this paper the process of investing funds by group of investors in the products production in certain region to meet public needs is considered. When making decision on investing funds, group of investors expects t...
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this paper addresses the path following problem of a wheeled mobile robot with rhombic like kinematics (drivable and steerable wheels both at front and rear) operating in cluttered environments. Four path following co...
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ISBN:
(纸本)9789898565716
this paper addresses the path following problem of a wheeled mobile robot with rhombic like kinematics (drivable and steerable wheels both at front and rear) operating in cluttered environments. Four path following controllers are developed to steer the kinematic model of a rhombic like vehicle (RLV) along a desired path: three are based on feedback laws derived at a kinematic level with geometrical inspiration;the fourth is a nonlinear controller built upon a kinematic model of a RLV using Lyapunov functions. All the developed controllers are capable of performing under two situations: when both wheels follow the same path, or when each wheel follows a different path. the dynamic modelling of a RLV is lastly introduced. Simulated results present a comparative performance assessment of the controllers while dealing, or not, with vehicle dynamics. the main conclusions of these controllers are summarized, leading to a possible application in the actual vehicles that will operate in the remote handling missions of the internationalthermonuclear Experimental Reactor (ITER).
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