The safety control problem for the class of block-triangular order preserving hybrid automata with imperfect state information is addressed. A dynamic feedback law is proposed, which exploits the order preserving prop...
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ISBN:
(纸本)9781424414970;1424414970
The safety control problem for the class of block-triangular order preserving hybrid automata with imperfect state information is addressed. A dynamic feedback law is proposed, which exploits the order preserving properties of the dynamics to construct state estimation and control algorithms that have linear complexity in the number of variables. The proposed algorithms are applied to a collision avoidance problem arising in the context of intelligent transportation.
Commercially viable aerial robotic vehicles require low-cost attitude stabilisation systems that are robust to noise and sensor bias. A typical attitude stabilisation system consists of MEMs accelerometers, gyroscopes...
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ISBN:
(纸本)9781424414970;1424414970
Commercially viable aerial robotic vehicles require low-cost attitude stabilisation systems that are robust to noise and sensor bias. A typical attitude stabilisation system consists of MEMs accelerometers, gyroscopes linked to separate attitude estimator and attitude controller algorithms. This paper proposes a non-linear attitude stabiliser for low-cost aerial robotic vehicles that combines attitude and bias estimation with control. The attitude control algorithm is based on a non-linear control Lyapunov function analysis derived directly in terms of the rigid-body attitude dynamics and measurement signals.
This paper studies distributed algorithms for performing graph rearrangements that preserve the connectivity of a robotic network. Given a connected graph describing the topology of the network, preserving a fixed set...
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ISBN:
(纸本)9781424414970;1424414970
This paper studies distributed algorithms for performing graph rearrangements that preserve the connectivity of a robotic network. Given a connected graph describing the topology of the network, preserving a fixed set of edges while performing a coordination task guarantees that connectivity is maintained. However, the preservation of a fixed set of edges often results in suboptimal and over-constrained robot operation. This paper presents a distributed algorithm to perform graph rearrangements that allow the robotic network to transform its interconnection topology between any two trees. We present a method for composing this algorithm with other control algorithms, and make preference guarantees about the choices of links to be preserved under the resulting composition. We use these ideas to propose a distributed formation morphing algorithm, and characterize its time complexity.
In this paper, we show that max-min fair congestion control methods with a stable symmetric Jacobian remain stable under arbitrary feedback delay and the stability condition of such methods does not involve any of the...
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ISBN:
(纸本)9781424414970;1424414970
In this paper, we show that max-min fair congestion control methods with a stable symmetric Jacobian remain stable under arbitrary feedback delay and the stability condition of such methods does not involve any of the delays. To demonstrate the practicality of the obtained result, we change the original algorithm in Kelly's work to become robust under random feedback delay and fixed constants of the control equation. The performance analysis shows that it offers smooth sending rate, exponential convergence to efficiency, and fast convergence to fairness, all of which make it be meaningful for future high-speed networks.
In this paper a new method for adaptive control of the general stochastic systems has been proposed. The method applies the minimum entropy control scheme to decrease the closed loop randomness of the output in an Ite...
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ISBN:
(纸本)9781424414970;1424414970
In this paper a new method for adaptive control of the general stochastic systems has been proposed. The method applies the minimum entropy control scheme to decrease the closed loop randomness of the output in an Iterative Learning Control (ILC) basis. Both modeling and control of the plant are performed using dynamic neural networks. For this purpose, the whole control horizon is divided into a certain number of time domain sub-intervals called Batches and a P-type ILC law is employed to train the model and controller parameters so that the closed-loop tracking error is decreased batch-by-batch. The method has the advantage of decreasing the output uncertainty versus the advances of batches along the time horizon. The analysis on the proposed ILC convergence is made and demonstrable simulation results are also provided to show the effectiveness of the obtained control algorithm.
We consider finding a time-optimal trajectory for an airplane from some starting point and orientation to some final point and orientation. Our model extends the Dubins car [15] to have altitude, which leads to Dubins...
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ISBN:
(纸本)9781424414970;1424414970
We consider finding a time-optimal trajectory for an airplane from some starting point and orientation to some final point and orientation. Our model extends the Dubins car [15] to have altitude, which leads to Dubins airplane. We assume that the system has independent bounded control over the altitude velocity as well as the turning rate in the plane. Through the use of the Pontryagin Maximum Principle, we characterize the time-optimal trajectories for the system. They are composed of turns with minimum radius, straight line segments, and pieces of planar elastica. One motivation for determining these elementary pieces is for use as motion primitives in modern planning and control algorithms that consider obstacles.
This paper addresses the safety control problem for a class of block triangular order preserving hybrid automata. In particular, the partial order structure of the system is exploited to obtain two main contributions....
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ISBN:
(纸本)9781424414970;1424414970
This paper addresses the safety control problem for a class of block triangular order preserving hybrid automata. In particular, the partial order structure of the system is exploited to obtain two main contributions. First, conditions are provided for the termination of the proposed algorithm. Second, the control algorithm has linear complexity in the number of variables.
In this paper, a switching control algorithm for the stabilization of network control systems (NCS) with time-varying delay in the presence of disturbance is investigated. Discrete-time equivalent model of NCS with ti...
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ISBN:
(纸本)9781424414970;1424414970
In this paper, a switching control algorithm for the stabilization of network control systems (NCS) with time-varying delay in the presence of disturbance is investigated. Discrete-time equivalent model of NCS with time delay and disturbance is derived. It is assumed that the time delay is unknown and time-varying, nonetheless bounded with a known bound. It is also assumed that the system is highly uncertain, and a set of controllers are given, which stabilize the whole uncertain parameter space. A switching scheme is developed subsequently to find the stabilizing controller at any time. A thorough stability analysis for NCS under the mentioned control scheme is provided. Simulation results are presented to show the efficacy of the proposed method in stabilization of an unstable NCS subject to time-varying delay and disturbance.
The regeneration power which is generated braking period of railway vehicles is increasing voltage of DC-line, and excessive voltage of DC-line is generating several problems. So, it's very important issue to DC t...
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ISBN:
(纸本)9781424418718
The regeneration power which is generated braking period of railway vehicles is increasing voltage of DC-line, and excessive voltage of DC-line is generating several problems. So, it's very important issue to DC traction system about dealing with regenerate power. Regeneration energy storage system is one of the methods to use the regeneration energy efficiently and to improve the problems. In this paper, we proposed the design and efficient control algorithm of the bidirectional DC/DC converter used in electric railway for utilization of regeneration energy. And as realization of prototype model, we verified the efficiency of bidirectional DC/DC converter.
We analyze the effects of time-delay in optical communication networks. A link level power control scheme adjusts the OSNR value of the signals toward channel OSNR optimization. We utilize the model from [4] along wit...
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ISBN:
(纸本)9781424414970;1424414970
We analyze the effects of time-delay in optical communication networks. A link level power control scheme adjusts the OSNR value of the signals toward channel OSNR optimization. We utilize the model from [4] along with its game-theoretic based control algorithm. We incorporate time-delay into the closed loop system, for the general case where every link has a unique time-delay. We derive sufficient conditions for stability under arbitrary time-delays and network configurations.
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