Anti-lock braking systems (ABS) have been developed to reduce tendency for wheel lock and improve vehicle control during sudden braking especially on slippery road surfaces. The objective of such control is to increas...
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Anti-lock braking systems (ABS) have been developed to reduce tendency for wheel lock and improve vehicle control during sudden braking especially on slippery road surfaces. The objective of such control is to increase wheel tractive force in the desired direction while maintaining adequate vehicle stability and steerability and also reducing the vehicle stopping distance. In this paper, a genetic-fuzzy ABS controller is designed. The objective function is defined to maintain wheel slip to a desired level so that maximum wheel tractive force and maximum vehicle deceleration are obtained. All components of the fuzzy system that is Takagi-Sugeno-Kang (TSK) type are obtained using a genetic algorithm. Simulation results show very good performance of the controller for different road conditions
Antilock braking systems (ABS) have been developed to reduce tendency of wheel lock and to improve vehicle control during sudden braking especially on slippery road surfaces. The objective of such control is to increa...
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Antilock braking systems (ABS) have been developed to reduce tendency of wheel lock and to improve vehicle control during sudden braking especially on slippery road surfaces. The objective of such control is to increase wheel tractive force in the desired direction while maintaining adequate vehicle stability and steerability and also reducing the vehicle stopping distance. In this paper, an optimized hybrid controller using a fuzzy system is proposed for antilock braking systems. The objective function is defined to maintain wheel slip to a desired level so that maximum wheel tractive force and maximum vehicle deceleration are obtained. All components of fuzzy system are optimized using a genetic algorithm and error based optimization technique. The error based global optimization approach is used for fast convergence near optimum point. Simulation results show fast convergence and good performance of the controller for different road conditions
In a real world bilevel decision-making, the lower level of a bilevel decision usually involves multiple decision units. This paper proposes an extended Kuhn-Tucker approach for linear bilevel multifollower programmin...
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In a real world bilevel decision-making, the lower level of a bilevel decision usually involves multiple decision units. This paper proposes an extended Kuhn-Tucker approach for linear bilevel multifollower programming problems with partial shared variables among followers. Finally numeric examples are given to show how the Kuhn-Tucker approach works.
Anti-lock braking systems (ABS) have been developed to reduce tendency for wheel lock and Improve vehicle control during sudden braking especially on slippery road surfaces. The objective of such control is to Increas...
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Anti-lock braking systems (ABS) have been developed to reduce tendency for wheel lock and Improve vehicle control during sudden braking especially on slippery road surfaces. The objective of such control is to Increase wheel tractive force In the desired direction while maintaining adequate vehicle stability and steerability and also reducing the vehicle stopping distance. In this paper, a genetic-fuzzy ABS controller is designed. The objective function is defined to maintain wheel slip to a desired level so that maximum wheel tractive force and maximum vehicle deceleration are obtained. All parameters of membership functions and rules of the fuzzy system that is Takagl-Sugeno-Kang (TSK) type are obtained using a genetic algorithm. Simulation results show very good performance of the controller for different road conditions.
Images are being produced and made available in ever increasing numbers;but how can we find images "like this one" that are of interest to us? Many different systems have been developed which offer content-b...
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A boundary meshless method (BMLM) for transient analysis was presented. This method combined a point interpolation method for construction of spatial shape functions for the governing equations. The spatial shape func...
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A boundary meshless method (BMLM) for transient analysis was presented. This method combined a point interpolation method for construction of spatial shape functions for the governing equations. The spatial shape functions satisfied the Kronecker delta function and the essential boundary condition can be directly imposed on the boundary. Eddy current distribution and eddy current density on symmetry axis were also given using the proposed method. The results all proved that BMLM is an effective technique to analyze the transient eddy current problems.
Multiple recirculations through an optical buffer using a fast-reconfigurable AVC based crosspoint switch matrix is shown. A 10 Gbit/s payload is used and a small power penalty for each additional recirculation is ach...
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Multiple recirculations through an optical buffer using a fast-reconfigurable AVC based crosspoint switch matrix is shown. A 10 Gbit/s payload is used and a small power penalty for each additional recirculation is achieved.
This paper presents a new approach to soft switching between two model predictive controllers. The motivation for this work comes from the control of large scale hierarchical systems where different operating scenario...
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This paper presents a new approach to soft switching between two model predictive controllers. The motivation for this work comes from the control of large scale hierarchical systems where different operating scenario asking for different control objective makes a single model predictive controller (MPC) unsuitable. The proposed soft switching approach shows much better switching performance both in system output and control input than the traditional hard switching. The stability of the designed soft switching process is analysed and sufficient conditions for stability are derived. Numerical examples with simulation results show that the proposed approach can be useful in practical applications.
An integrated approach to control of quantity and quality in water supply and distribution systems is proposed. The integrated control consists in optimising the operational cost, meeting a demand on water of desired ...
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An integrated approach to control of quantity and quality in water supply and distribution systems is proposed. The integrated control consists in optimising the operational cost, meeting a demand on water of desired quality and maintaining the system constraints. This constrained optimising control problem is complex due to nonlinearities, large dimension, output constraints, mixed-integer structure of the variables involved, at least two time scales in the system dynamics and an uncertainty. A sub-optimal two-level hierarchical control structure is proposed that allows incorporating the desired controller functions and yet making the synthesis of these functions possible. The algorithms for implementing the functionalities are proposed and discussed. Detail design of the lower level controller is presented and investigated. The controller performance is validated by simulation. [ABSTRACT FROM AUTHOR]
We propose a low complexity frequency diversity technique for OFDM to improve its error performance in a frequency-selective wireless channel. Recently, linear precoding has been proposed to achieve frequency diversit...
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We propose a low complexity frequency diversity technique for OFDM to improve its error performance in a frequency-selective wireless channel. Recently, linear precoding has been proposed to achieve frequency diversity (multipath diversity) in OFDM, which overcomes the problem of channel nulls (deep fades in frequency-domain). However, currently reported precoding techniques for OFDM have high computational complexity due to associated maximum-likelihood (ML) decoding or pseudo-inverse of large matrices (linear decoding). In the proposed diversity enhanced-OFDM (DE-OFDM), the decoding complexity is minimal as maximum ratio combining (MRC) is incorporated at the receiver to generate a decision variable for each repeatedly transmitted symbol over multiple subcarriers. Moreover, we show that DE-OFDM does not cause any effective data rate (throughput) loss as DE-OFDM using a higher-order modulation scheme (thus the same data rate as conventional OFDM) can provide a better error performance. Both analytical and simulation results are provided to demonstrate the efficiency of DE-OFDM in achieving frequency diversity benefit with low receiver complexity in multipath (frequency-selective) channels. DE-OFDM also outperforms the previously proposed ICI self-cancellation schemes in a frequency-selective fading channel with small frequency offset error.
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