scholarly journals A Methods for Determining the State Weighting Matrix Using LQ Control: The Moving Multiple Poles with Jordan Block to a Complex Poles

2021 ◽  
Vol 22 (7) ◽  
pp. 614-620
Author(s):  
Minho Park
Author(s):  
Kazuto Seto ◽  
Yoshirou Furuishi

Abstract Although it is known that active dynamic absorbers are useful for controlling vibration of structures, the design method for popular usage has not yet been established. This paper proposes the design method of the active dynamic absorber by use of the LQ optimum control theory. First, nondimensional representation of the state equation of the structure and active dynamic absorber system, the state feedback gain matrix, and the weight matrix, respectively, are constructed to obtain a generality. Secondly, the relationship between the vibration control effect and parameters of the weighting matrix are made clear for designing. The design data are prepared as the nondimensional root locus, frequency response, and impulse response charts. Effectiveness of the active dynamic absorber designed through the method is demonstrated experimentally.


Author(s):  
T. A. Welton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.


1980 ◽  
Vol 11 (2) ◽  
pp. 85-94 ◽  
Author(s):  
Jack Damico ◽  
John W. Oller

Two methods of identifying language disordered children are examined. Traditional approaches require attention to relatively superficial morphological and surface syntactic criteria, such as, noun-verb agreement, tense marking, pluralization. More recently, however, language testers and others have turned to pragmatic criteria focussing on deeper aspects of meaning and communicative effectiveness, such as, general fluency, topic maintenance, specificity of referring terms. In this study, 54 regular K-5 teachers in two Albuquerque schools serving 1212 children were assigned on a roughly matched basis to one of two groups. Group S received in-service training using traditional surface criteria for referrals, while Group P received similar in-service training with pragmatic criteria. All referrals from both groups were reevaluated by a panel of judges following the state determined procedures for assignment to remedial programs. Teachers who were taught to use pragmatic criteria in identifying language disordered children identified significantly more children and were more often correct in their identification than teachers taught to use syntactic criteria. Both groups identified significantly fewer children as the grade level increased.


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