100,165 research outputs found
Automating control system design via a multiobjective evolutionary algorithm
This chapter presents a performance-prioritized computer aided control system design (CACSD) methodology using a multi-objective evolutionary algorithm. The evolutionary CACSD approach unifies different control laws in both the time and frequency domains based upon performance satisfactions, without the need of aggregating different design criteria into a compromise function. It is shown that control engineers' expertise as well as settings on goal or priority for different preference on each performance requirement can be easily included and modified on-line according to the evolving trade-offs, which makes the controller design interactive, transparent and simple for real-time implementation. Advantages of the evolutionary CACSD methodology are illustrated upon a non-minimal phase plant control system, which offer a set of low-order Pareto optimal controllers satisfying all the conflicting performance requirements in the face of system constraints
On the first Hochschild cohomology of admissible algebras
Our aim in this paper is to investigate the first Hochschild cohomology of
{\em admissible algebras} which can be seen as a generalization of basic
algebras. For this purpose, we study differential operators on an admissible
algebra. Firstly, differential operators from a path algebra to its quotient
algebra as an admissible algebra are discussed. Based on this discussion, the
first cohomology with admissible algebras as coefficient modules is
characterized, including their dimension formula. Besides, for planar quivers,
the -linear bases of the first cohomology of acyclic complete monomial
algebras and acyclic truncated quiver algebras are constructed over the field
of characteristic .Comment: 16 page
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