The major purpose of suspension in road vehicles is to provide passenger ride comfort while maintaining the vehicle to be safe and stable. A conflict always exists in the design of passive suspension. To achieve super...
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The major purpose of suspension in road vehicles is to provide passenger ride comfort while maintaining the vehicle to be safe and stable. A conflict always exists in the design of passive suspension. To achieve superior performance the suspension often requires additional energy suppliers, the active elements. Investigations into active suspension for ground vehicles have increased in recent years. The performance of active suspension system mainly depends on the control technique adopted. In this paper, control techniques like conventional, optimal, adaptive and fuzzy logic were considered for providing active input to the suspension system to maintain better performance. A comparative study on the performance of the suspension system with the above controllers was also made.
Genetic algorithm (GA) based fuzzy logic controller (FLC) is proposed for vehicle active suspension system. GA is used to optimize a Mamdani type fuzzy inference system (FIS). The GA determines the number and orientat...
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Genetic algorithm (GA) based fuzzy logic controller (FLC) is proposed for vehicle active suspension system. GA is used to optimize a Mamdani type fuzzy inference system (FIS). The GA determines the number and orientation of the membership functions used to represent the linguistic variables and the fuzzy rule set. Simulation results show that the fusion of GA and FLC for an active suspension system provides better ride comfort to the passengers, good vehicle handling to the driver and lesser damage to the road.
Despite many signi?cant advances in the theory of nonlinear control in recent years, the majority of control laws implemented in the European aerospace - dustry are still designed and analysed using predominantly line...
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ISBN:
(数字)9783540737193
ISBN:
(纸本)9783540737186
Despite many signi?cant advances in the theory of nonlinear control in recent years, the majority of control laws implemented in the European aerospace - dustry are still designed and analysed using predominantly linear techniques applied to linearised models of the aircrafts’ dynamics. Given the continuous increase in the complexity of aircraft control laws, and the corresponding - crease in the demands on their performance and reliability, industrial control law designers are highly motivated to explore the applicability of new and more powerful methods for design and analysis. The successful application of fully nonlinear control techniques to aircraft control problems o?ers the prospect of improvements in several di?erent areas. Firstly, there is the possibility of - proving design and analysis criteria to more fully re?ect the nonlinear nature of the dynamics of the aircraft. Secondly, the time and e?ort required on the part of designers to meet demanding speci?cations on aircraft performance and h- dling could be reduced. Thirdly, nonlinear analysis techniques could potentially reduce the time and resources required to clear ?ight control laws, and help to bridge the gap between design, analysis and ?nal ?ight clearance. Theaboveconsiderationsmotivatedtheresearchpresentedinthisbook,which is the result of a three-year research e?ort organised by the Group for Aeron- tical Research and Technology in Europe (GARTEUR). In September 2004, GARTEUR Flight Mechanics Action Group 17 (FM-AG17) was established to conduct research on ”New Analysis and Synthesis Techniques for Aircraft control”.
This paper considers the stability of asymptotically stable linear systems subject to actuator rate constraints. The rate limit constraint is modelled by a first order feedback system with magnitude saturation and an ...
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The majority of tissue characterizations through electrical impedance tomography are based on the Cole-Cole model. The frequency dependant model can be used to describe both the intra- and extra-cellular characteristi...
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A current source is one of the key components in an EIT system, particularly in EIT based breast imaging which is called electrical impedance mammography (EIM). It is also a critical source of systematic errors due to...
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The ultimate task for electrical impedance mammography (EIM) is to identify a malignant lesion within the human breast at its early stage with low faulty positive rate, preferably using pathologically and clinically a...
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This paper considers the stability of asymptotically stable linear systems subject to actuator rate constraints. The rate limit constraint is modelled by a first order feedback system with magnitude saturation and an ...
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This paper considers the stability of asymptotically stable linear systems subject to actuator rate constraints. The rate limit constraint is modelled by a first order feedback system with magnitude saturation and an integrator. Exploiting the ability to analytically derive the partial fraction expansion of the integrator modes, stability criteria are derived in terms of LMIs by expressing the system in Popov's indirect control form. The stability criteria are compared to those for magnitude limited systems, and it is shown that under certain conditions the LMI conditions for global asymptotic stability (GAS) with magnitude limits ensure GAS with rate limits. An interpretation of the results in terms of anti-windup (AW) control is presented, with IMC AW control shown to provide GAS for magnitude and rate saturation. The results provide constructive theory for the stabilisation of rate limited systems, and insight into the effect of using convex but conservative design theory, as is currently standard, on the properties of Lur'e systems.
The paper deals with an experimental heat transfer set-up which has been designed for testing time delay system approaches in modelling and control design. First, the set-up is described and some implementation issues...
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