• Title/Summary/Keyword: Operator stability

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Real-time estimation of arc stability in GMAW process (GMAW 공정에서 아크 안정성의 실시간 측정)

  • 원윤재;부광석;조형석
    • Journal of Welding and Joining
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    • v.8 no.1
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    • pp.31-42
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    • 1990
  • Arc must be stable during welding first of all other factors for obtaining sound weldment, especially in the automation of welding process. Arc stability is somewhat sophisticated phenomenon which is not clearly defined yet. In consumable electrode welding, the voltage and current variation due to metal transfer enables to assess arc stability. Recently, statistical analyses of the voltage and current waveform factors are performed to assess the degress of arc stability which is assessed and controlled by operator's own experience by now. But, considering the increasing need and the trend of automation of welding process, it is necessary to monitor arc stability in real-time. In this sutdy, the modified stability index composed of two voltage and current wvaeform factors (arc time and short circuit time) reduced from four factors (arc time, short circuit time, average arc current and average short circuit current) in Mita's index by the welding electrical circuit modeling is proposed and verified by experiments to be well estimating arc stability in the static sense. Also, the recursive calculation form estimating present arc stability in the dynamic sense is developed for real-time estimation. The results of applying the recursive index during welding show good estimation of arc stability in real-time. Therefore, the results of this study offers the mean for real-time control arc stability.

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WEAK CONVERGENCE THEOREMS IN FEYNMAN'S OPERATIONAL CALCULI : THE CASE OF TIME DEPENDENT NONCOMMUTING OPERATORS

  • Ahn, Byung Moo
    • Journal of the Chungcheong Mathematical Society
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    • v.25 no.3
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    • pp.531-541
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    • 2012
  • Feynman's operational calculus for noncommuting operators was studied by means of measures on the time inteval. And various stability theorems for Feynman's operational calculus were investigated. In this paper we see the time-dependent stability properties when the operator-valued functions take their values in a separable Hilbert space.

FEYNMAN′S OPERATIONAL CALCULI FOR TIME DEPENDENT NONCOMMUTING OPERATORS

  • Brian Jefferies
    • Journal of the Korean Mathematical Society
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    • v.38 no.2
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    • pp.193-226
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    • 2001
  • We study Feynman's Operational Calculus for operator-valued functions of time and for measures which are not necessarily probability measures; we also permit the presence of certain unbounded operators. further, we relate the disentangling map defined within the solutions of evolution equations and, finally, remark on the application of stability results to the present paper.

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STABILITY OF A TWO-STRAIN EPIDEMIC MODEL WITH AN AGE STRUCTURE AND MUTATION

  • Wang, Xiaoyan;Yang, Junyuan;Zhang, Fengqin
    • Journal of applied mathematics & informatics
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    • v.30 no.1_2
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    • pp.183-200
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    • 2012
  • A two-strain epidemic model with an age structure mutation and varying population is studied. By means of the spectrum theory of bounded linear operator in functional analysis, the reproductive numbers according to the strains, which associates with the growth rate ${\lambda}^*$ of total population size are obtained. The asymptotic stability of the steady states are obtained under some sufficient conditions.

STABILITY AND CONSTRAINED CONTROLLABILITY OF LINEAR CONTROL SYSTEMS IN BANACH SPACES

  • Phat, Vu-Ngoc;Park, Jong-Yeoul;Jung, Il-Hyo
    • Journal of the Korean Mathematical Society
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    • v.37 no.4
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    • pp.593-611
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    • 2000
  • For linear time-varying control systems with constrained control described by both differential and discrete-time equations in Banach spaces was give necessary and sufficient conditions for exact global null-controllability. We then show that for such systems, complete stabilizability implies exact null-controllability.

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FUNDAMENTAL STABILITIES OF THE NONIC FUNCTIONAL EQUATION IN INTUITIONISTIC FUZZY NORMED SPACES

  • Bodaghi, Abasalt;Park, Choonkil;Rassias, John Michael
    • Communications of the Korean Mathematical Society
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    • v.31 no.4
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    • pp.729-743
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    • 2016
  • In the current work, the intuitionistic fuzzy version of Hyers-Ulam stability for a nonic functional equation by applying a fixed point method is investigated. This way shows that some fixed points of a suitable operator can be a nonic mapping.

STABILITY THEOREM FOR THE FEYNMAN INTEGRAL APPLIED TO MULTIPLE INTEGTALS

  • Kim, Bong-Jin
    • The Pure and Applied Mathematics
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    • v.8 no.1
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    • pp.71-78
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    • 2001
  • In 1984, Johnson[A bounded convergence theorem for the Feynman in-tegral, J, Math. Phys, 25(1984), 1323-1326] proved a bounded convergence theorem for hte Feynman integral. This is the first stability theorem of the Feynman integral as an $L(L_2 (\mathbb{R}^N), L_2(\mathbb{R}^{N}))$ theory. Johnson and Lapidus [Generalized Dyson series, generalized Feynman digrams, the Feynman integral and Feynmans operational calculus. Mem, Amer, Math, Soc. 62(1986), no 351] studied stability theorems for the Feynman integral as an $L(L_2 (\mathbb{R}^N), L_2(\mathbb{R}^{N}))$ theory for the functional with arbitrary Borel measure. These papers treat functionals which involve only a single integral. In this paper, we obtain the stability theorems for the Feynman integral as an $L(L_1 (\mathbb{R}^N), L_{\infty}(\mathbb{R}^{N}))$theory for the functionals which involve double integral with some Borel measures.

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BASIS WIGHT PROFILE FUZZY CONTROL FOR PAPER MACHINES

  • Sasaki, Takashi
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10b
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    • pp.1365-1370
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    • 1990
  • We have developed a new fuzzy control method for paper machine basis weight profile. The conventional linear control method has not yielded good results on some machines. This new control method, however, realizes long-term stability and convergence of the profile as good or better than that achieved under manual control by an operator.

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Feasible Scaled Region of Teleoperation Based on the Unconditional Stability

  • Hwang, Dal-Yeon;Blake Hannaford;Park, Hyoukryeol
    • Transactions on Control, Automation and Systems Engineering
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    • v.4 no.1
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    • pp.32-37
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    • 2002
  • Applications of scaled telemanipulation into micro or nano world that shows many different features from directly human interfaced tools have been increased continuously. Here, we have to consider many aspects of scaling such as force, position, and impedance. For instance, what will be the possible range of force and position scaling with a specific level of performance and stability\ulcorner This knowledge of feasible staling region can be critical to human operator safety. In this paper, we show the upper bound of the product of force and position scaling and simulation results of 1DOF scaled system by using the Llewellyn's unconditional stability in continuous and discrete domain showing the effect of sampling rate.