The purpose of this work is to design a Sliding-Mode control from a reduced system model using a PID as sliding surface. The controller is applied to a Ball and Plate system which has extremely non-linear characterist...
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ISBN:
(纸本)9789897583049
The purpose of this work is to design a Sliding-Mode control from a reduced system model using a PID as sliding surface. The controller is applied to a Ball and Plate system which has extremely non-linear characteristics and therefore does not have a unique solution in terms of ball stabilization control. The results are obtained by simulations and with real experiments in the implemented system. A comparative performance analysis is done between the proposed approach and a PID controller to stabilize the ball at fixed points of the plate.
This paper proposes a disturbance observer to be integrated inside a path-following controller in order to improve motion accuracy of an autonomous driving tractor. During operation, the tractor undergoes the effects ...
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ISBN:
(纸本)9789897583803
This paper proposes a disturbance observer to be integrated inside a path-following controller in order to improve motion accuracy of an autonomous driving tractor. During operation, the tractor undergoes the effects of external forces due to either the action of the implement or the inclination of the ground. In such conditions, it is difficult to work precisely along a pre-determined path. By considering external forces as disturbances, it is possible to design a disturbance observer that estimates the steering angle on the basis of yaw-rate and lateral velocity. The proposed approach has been tested in a simulation environment.
The paper focuses on a recently introduced paradigm for the logistic process of picking, with respect to the man-to-goods and goods-to-man concept: the robot-to-goods. First the task and system architecture of the fas...
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ISBN:
(纸本)9789897581984
The paper focuses on a recently introduced paradigm for the logistic process of picking, with respect to the man-to-goods and goods-to-man concept: the robot-to-goods. First the task and system architecture of the fast deployable autonomous commissioning system are described, then the economic efficiency of the system is analysed in a real business case scenario using a simplified method, which is explained and discussed. The clearly positive Net Present Value of the investment and the short Payback Period obtained in the business case prove how the robot-to-goods paradigm for the commissioning process, implemented through the automation of the forklift platform, is economically attractive for small and medium size enterprises.
To perform many complex tasks, modem robots often require robust and stable force control. Linear, fixed-gain controllers can only provide adequate performance when they are tuned to specific task requirements, but if...
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ISBN:
(纸本)9789728865849
To perform many complex tasks, modem robots often require robust and stable force control. Linear, fixed-gain controllers can only provide adequate performance when they are tuned to specific task requirements, but if the environmental stiffness at the robot/task interface is unknown or varies significantly, performance is degraded. This paper describes the design of a robotic force controller that has a simple architecture yet is robust to bounded uncertainty in the environmental stiffness. Generic stability conditions for the controller are developed and a simple design methodology is formulated. The controller design is tested on an experimental robot, and is shown to perform favourably in the presence of large changes in environmental operating conditions.
This paper presents a novel design and architecture control of a foldable quadrotor. This design is based on a variable geometry that can be changed during the flight. It is able to modify the orientation of its arms ...
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ISBN:
(纸本)9789897584428
This paper presents a novel design and architecture control of a foldable quadrotor. This design is based on a variable geometry that can be changed during the flight. It is able to modify the orientation of its arms independently, thanks to its special morphology. This quadrotor, exploits simple mechanisms i.e. rotating arms. We stress that the control of this category of robots is not obvious compared to the conventional ones. So, a detailed generic model and backstepping control that take into account the variation of the center of gravity and the inertia are presented. Simulation results are also provided in order to illustrate the performances of this controller.
The asynchronous control design of continuous-time Markovian jump systems with bounded time-varying transition rates is addressed in this paper. According to the framework of parameterized linear matrix inequalities (...
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ISBN:
(纸本)9789897583803
The asynchronous control design of continuous-time Markovian jump systems with bounded time-varying transition rates is addressed in this paper. According to the framework of parameterized linear matrix inequalities (PLMIs), essential stabilization conditions are established with consideration on dissipativity performance and then transform to solvable sets of linear matrix inequalities (LMIs) under our proposed method. Especially, our technique is derived from not only time-varying system modes but also asynchronous control modes transition rates. The effectiveness of our method is then illustrated through our numerical example.
We propose in this paper, to introduce a method to validate logic controller programs adapted to the teaching of Discrete Event Systems. The use of real systems for teaching raises two problems. The first one concerns...
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ISBN:
(纸本)9789728865849
We propose in this paper, to introduce a method to validate logic controller programs adapted to the teaching of Discrete Event Systems. The use of real systems for teaching raises two problems. The first one concerns the security of human beings (students and teachers) and materials. The second problem is the necessity to be able to detect possible errors done by students and to bring an explanation. We propose a method to define a level of system abstraction, to validate the student's control by the mean of a validation filter placed between the plant and the controller. The specifications contained in the filter make it possible to detect errors and to generate an explanation automatically. We applied this method to an original project where it was proposed to 7 year-old children, to discover automation, by programming a tablets packaging system.
Redundant Advanced Driving Simulators (hexapods mounted on rails) present an extra capability to reproduce motion sensations. The exploitation of this capability is currently done by frequency separation methods witho...
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ISBN:
(纸本)9789728865832
Redundant Advanced Driving Simulators (hexapods mounted on rails) present an extra capability to reproduce motion sensations. The exploitation of this capability is currently done by frequency separation methods without taking into account the frequency overlapping between the hexapod and the rails. Within this bandwidth, these two degrees of freedom could be considered as equivalent. Our aim is to use this equivalence to improve the motion restitution. We offer two algorithms based on the hybrid systems framework which deal with the longitudinal mode. Their goal is to improve the restitution of motion sensations by reducing false cues (generated by actuators braking) and decreasing null cues (due to actuators blocking). Our algorithms include and treat all steps of motion cueing: motion tracking (restitution), braking before reaching the displacement limits, washout motion, and switching rules.
This paper aims at applying optimal control to investigate different vaccination strategies against the epidemic spread of viral diseases. Background of the study is the situation in the first half of 2021, when many ...
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ISBN:
(纸本)9789897585227
This paper aims at applying optimal control to investigate different vaccination strategies against the epidemic spread of viral diseases. Background of the study is the situation in the first half of 2021, when many countries started their vaccination procedures against the COVID-19 disease, but suffered from shortages of vaccines, such that the efficient distribution of the available amount of vaccine turned out to be crucial to mitigate the pandemic. The paper first suggests an extended version of a known model of virus spread in order include the vaccination process. Based on this model, the formulation and solution of optimization problems is used to determine how available vaccine should be distributed over different age-groups of the population to minimize virus spread. Effectiveness of the obtained strategies compared to standard ones is demonstrated in simulations.
A design of an underactuated electromechanical gripper with force control algorithm is presented in this paper. The key feature of the gripper is the ability to grasp fragile objects and objects of a complex shape. Su...
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ISBN:
(纸本)9789897583803
A design of an underactuated electromechanical gripper with force control algorithm is presented in this paper. The key feature of the gripper is the ability to grasp fragile objects and objects of a complex shape. Such advantages are due to the usage of elastic joints and force sensitive resistors embedded in modules of gripper's fingers. Also low cost and mass of the presented device makes its application rational for a larger number of robotic systems. Proposed force control system is based on PI control and passification approaches that provide tuning simplicity and good performance in the case of unknown environments. Experimental results show the efficiency of proposed solution.
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