Снег На Светопрозрачных Кровлях
Отапливаемых Зданий

Plotnikov, A. A.; Konstantinov, A. P.; Boriskina, I. V.

doi:10.22227/1997-0935.2012.4.51-55

Cited by 2 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, more rapid damping of oscillatory phenomena is observed when using triangular and square plots in the intake system. According to the authors, this is due to the stabilizing effect of the longitudinal vortex structures generated at the corners of triangular and square crosssections [4]. It was found that we can have a number of advantages due to the placement of the triangular and square plots in the intake pipe in comparison with a pipe of circular crosssection.…”

Section: The Results Of Experimental Studiesmentioning

confidence: 99%

See 1 more Smart Citation

The flows structure in unsteady gas flow in pipes with different cross-sections

2017

View full text Add to dashboard Cite

Abstract.The results of numerical simulation and experimental study of the structure of unsteady flows in pipes with different cross sections are presented in the article. It is shown that the unsteady gas flow in a circular pipe is axisymmetric without secondary currents. Steady vortex structures (secondary flows) are observed in pipes with cross sections in the form of a square and an equilateral triangle. It was found that these secondary flows have a significant impact on gas flows in pipes of complex configuration. On the basis of experimental researches it is established that the strong oscillatory phenomena exist in the inlet pipe of the piston engine arising after the closing of the intake valve. The placement of the profiled plots (with a cross section of a square or an equilateral triangle) in the intake pipe leads to the damping of the oscillatory phenomena and a more rapid stabilization of pulsating flow. This is due to the stabilizing effect of the vortex structures formed in the corners of this configuration.

show abstract

Section: The Results Of Experimental Studiesmentioning

confidence: 99%

“…The drive of a crankshaft was carried out by using an asynchronous motor, the rotational speed of which was regulated by the frequency Converter in the range from 600 to 3000 rpm. A detailed description of the experimental facilities is presented in [4,5].…”

Section: Introductionmentioning

confidence: 99%

The flows structure in unsteady gas flow in pipes with different cross-sections

2017

View full text Add to dashboard Cite

show abstract

“…Aksenov with co-authors [17,18,19], as well as works [20,21] on the development of data preparation modules in the framework of mathematical modeling of enterprise management systems, however, these works did not conduct a mathematical study of the effect of feedback loop on the parameters of the state and dynamics of economic systems. Structural schemes and models were built in articles [22][23][24]. Equations of the functioning of the enterprise as a production and economic system are also derived using the scientific apparatus of TAC.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Let us derive the differential equations of the firm's functioning according to the structural diagram of Fig.1taking into account the time inertia (the presence of time lags M), which take place in real activity. Differential equations from[22],[23] are introduced. Additional members are introduced into them, taking into account the following representations.…”

mentioning

confidence: 99%

Mathematical Model with Feedback Loop in Company Control

et al. 2021

View full text Add to dashboard Cite

This article is devoted to the further development of feedback loop models. They are used in the management of a single-industry firm. The development of the studying consists in the mathematical modeling of transients and assessing their impact on economic indicators. To solve this problem, the following was done in the article. A structural model of the functioning of a single-industry firm (SIF) is presented. It is built in accordance with the theory of automatic control (TAC) and includes elements: a management unit, a production unit, a sales unit, information nodes, as well as a feedback loop (FL). Equations and relationships describing the logic of the functioning of the company as a production system are presented. They allowed us to derive dynamic relationships and differential equations that reflect feedback loops on revenue and production costs. The system of expressions in operator form is presented, which describes the contour of the FL SIF. It has the form of a system of differential equations. It forms the basis of the mathematical model of SIF in the control system. This model made it possible to obtain a graphical interpretation of transients with closed and open FL based on the use of the Mathcad editor. Transients are fluctuations in sales volumes and production costs in the presence of disturbing influences. This is the scientific result and determines the novelty of the article.

show abstract

Снег На Светопрозрачных Кровлях Отапливаемых Зданий

Cited by 2 publications

References 0 publications

The flows structure in unsteady gas flow in pipes with different cross-sections

The flows structure in unsteady gas flow in pipes with different cross-sections

Mathematical Model with Feedback Loop in Company Control

Contact Info

Product

Resources

About