10,093 research outputs found
Hybrid-control of synapse circuits for programmable cellular neural networks
This paper describes a hybrid weight-control strategy for VLSI realizations of programmable Cellular Neural Networks (CNNs), based on auto-tuning of analog control signals to digitally specified values. The approach merges the advantages of digital and analog programmability, achieving low areas and reduced number of control lines, simplifying the control and storage of weight values, and eliminating their dependency on global process-parameter variations
Unbounded Viscosity Solutions of Hybrid Control Systems
We study a hybrid control system in which both discrete and continuous
controls are involved. The discrete controls act on the system at a given set
interface. The state of the system is changed discontinuously when the
trajectory hits predefined sets, namely, an autonomous jump set or a
controlled jump set where controller can choose to jump or not. At each
jump, trajectory can move to a different Euclidean space. We allow the cost
functionals to be unbounded with certain growth and hence the corresponding
value function can be unbounded. We characterize the value function as the
unique viscosity solution of the associated quasivariational inequality in a
suitable function class. We also consider the evolutionary, finite horizon
hybrid control problem with similar model and prove that the value function is
the unique viscosity solution in the continuous function class while allowing
cost functionals as well as the dynamics to be unbounded
Central controller for hybrid control over network
In this paper, a central controller for position/force
hybrid control over network is proposed. In the proposed method,
the central controller receives position and force information
from each plant. Then, the central controller generates acceleration
references for each plant by using a hybrid controller and a
dead time compensator. As an application, bilateral control with
communication delay is implemented. And some simulations and
experiments verify the validity of the proposed method
Global controllability tests for geometric hybrid control systems
Hybrid systems are characterized by having an interaction between continuous
dynamics and discrete events. The contribution of this paper is to provide
hybrid systems with a novel geometric formulation so that controls can be
added. Using this framework we describe some new global controllability tests
for hybrid control systems exploiting the geometry and the topology of the set
of jump points, where the instantaneous change of dynamics take place.
Controllability is understood as the existence of a feasible trajectory for the
system joining any two given points. As a result we describe examples where
none of the continuous control systems are controllable, but the associated
hybrid system is controllable because of the characteristics of the jump set.Comment: 27 pages, 5 figure
Enhanced teleoperation performance using hybrid control and virtual fixture
To develop secure, natural and effective teleoperation, the perception of the slave plays a key role for the interaction of a human operator with the environment. By sensing slave information, the human operator can choose the correct operation in a process during the human–robot interaction.This paper develops an integrated scheme based on a hybrid control and virtual fixture approach for the telerobot. The human operator can sense the slave interaction condition and adjust the master device via the surface electromyographic signal. This hybrid control method integrates the proportional-derivative control and the variable stiffness control, and involves the muscle activation at the same time. It is proposed to quantitatively analyse the human operator’s control demand to enhance the control performance of the teleoperation system. In addition, due to unskilful operation and muscle physiological tremor of the human operator, a virtual fixture method is developed to ensure accuracy of operation and to reduce the operation pressure on the human operator. Experimental results demonstrated the effectiveness of the proposed method for the teleoperated robot
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