On the Wave Heat Transfer at Times Comparable with the Relaxation Time upon Intensive Convective-Conductive Heating

Формалев, В. Ф.; Колесник, С. А.; Kuznetsova, Ekaterina

doi:10.1134/s0018151x18030069

Cited by 13 publications

(5 citation statements)

References 7 publications

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“…Then the distribution of the output power of the primary power supply source to ensure the operation of the autonomous drive control system (see Figure 8) is shown in the diagram (see Figure 9). From the Equations 3, 4 and Equation 8, we determine the power dissipated in the secondary power source, stabilizer, static power amplifier, and operating mechanism (Equations 13,14,15,16). Based on Equations 3, 4, 8 and performance of the energy channel (see Figure 3) through its output and dissipation power Equation 9, we determine the total power of Р 1 , of the elements, or through their coefficient of consumed by the energy channel of the autonomous drive control system (see Figure 8), and equal to the power of the primary power supply source, as Equation 17Let us estimate the coefficient of performance of the energy channel  ЭК 3 of the autonomous drive control system (see Figure 8) through its output and dissipation power of the elements, or through their coefficient of performance, as Equation 18.…”

Section: Resultsmentioning

confidence: 99%

Mathematical Model of Energy Efficiency of Mechatronic Modules and Power Sources for Prospective Mobile Objects

Kuznetsova¹,

Makarenko²

2019

PTQ

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Intensive development of equipment contributes to a significant impact on the high level of competitiveness of new samples, improving technologies, and promise of enshrined ideas as well as resource intensity and time of their implementation. The relevance of the scientific paper lies in the fact that in the process of designing drive systems for guiding aviation equipment, one of the important elements is taking into account the limitations on the power source energy storage. The purpose of the scientific paper is to develop a mathematical model of energy efficiency of mechatronic modules and power sources for prospective mobile objects. An integrated approach is used to study the influence of structures and elements of storage devices on the characteristics of power sources in the interest of finding the ways to increase the energy efficiency of the entire drive system for guiding mechatronic modules of aviation systems in general. It has been determined that in order to reduce the weight-size parameters of the power supply source, the stabilizer in the power section, as a rule, is not set. It has been found out that power and information sections of drive systems differ from each other in terms of the stability of the energy coordinates. And stabilized parameters (potential, current) are necessary only for the information channel. With the help of analytical dependencies, the main parameters of the primary source were evaluated depending on the efficiency of the consumer, efficiency of the stabilizer and efficiency of the secondary power source. A method to study the influence of elements of the energy (power) channel on the output power of the power source the mechatronic modules for prospective aviation mobile objects (autonomous aviation drives, guided missiles, guided parachute systems) is being developed.

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Section: Resultsmentioning

confidence: 99%

Mathematical Model of Energy Efficiency of Mechatronic Modules and Power Sources for Prospective Mobile Objects

Kuznetsova¹,

Makarenko²

2019

PTQ

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“…The linearized problem of loss of stability of thin-walled cylindrical shell under local edge heating by high-intensity radiation source simulating the action of the laser beam was considered, and the critical power of the source for its different positions on the circuit was calculated (Formalev et al, 2018b). The shell panels in form of circular cylinder in the three-dimensional quasistatic formulation of thermoelasticity problem were considered.…”

Section: Methodsmentioning

confidence: 99%

Research of the Problem of Loss of Stability of Cylindrical Thinwalled Structures Under Intense Local Temperature Exposure

Kurbatov¹,

Orekhov²,

Rabinskiy³

et al. 2020

PTQ

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Presently, three-dimensional printing technology is developing rapidly. This happens due to the need to create products of complex shape, the production of which by existing standard methods is very difficult and disadvantageous, and sometimes technically impossible. The study aims to investigate the problem of temperature stability of a thin-walled cylindrical structure under unsteady local thermal exposure, simulating the motion of a laser beam spot along one of the ends. To solve the problem, the finite element method was used. Since the geometric areas of calculation were parameterized, then for each set of parameters, its own finite element mesh was used for each type of analysis. A parametric spatial finite element model of cylindrical shell pinched at the bottom end was constructed. The local moving heat flux acts on the opposite side, simulating the movement of a laser beam during the additive formation of a thin-walled element. Numerical solutions of the nonstationary dynamic heat conduction problem were obtained, spatiotemporal temperature dependences were obtained, and solutions of the quasistatic problem of the loss of both local and complete loss of stability of the equilibrium state of the cylinder at various times due to the occurrence of local compressive stresses during intense heating were obtained. The dependences of critical heat flux power corresponding to the loss of stability on the cylinder wall thickness and its height were obtained. The above results can be used as calibration parameters of the process of creating thin-walled structures using additive technologies of Laser Melting class for products that require increased requirements for manufacturing accuracy.

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“…The main curvature is determined by the formula (1.2.28) where the average curvature takes the form of ( ) 2 k ξ and the components of the normal vector are set by the expressions 32-33 for the case of plane problem (Formalev et al, 2018a; Rabinskiy and Tushavina, 2018, 2019; Zhavoronok, 2018).…”

Section: Plane Oblique Pressure Wave Diffraction On Elastic Shell In the Form Of Parabolic Cylindermentioning

confidence: 99%

Non-Stationary Problem of the Plane Oblique Pressure Wave Diffraction on Thin Shell in the Shape of Parabolic Cylinder

Rabinskiy¹

2019

PTQ

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A non-stationary plane problem of the dynamics of thin elastic shell in the form of parabolic cylinder immersed in the fluid under the impact of the plane oblique pressure wave is considered. To solve this problem, a system of equations in the related formulation is constructed. Herewith, the hydroelasticity problems are reduced to the equations of the shell dynamics, the damping effect of fluid is taken into account by introducing an integral convolution type operator in the time domain which in the first approximation allows for accounting the capillary porosity of the shell material. The operator core is a surface transition function of the auxiliary problem of the plane acoustic pressure wave diffraction on a convex surface. The problem is solved approximately based on the thin layer hypothesis. The integral and differential equations of shell motion are solved numerically based on the difference discretization of differential operators and the representation of the integral operator by sum using the trapezium rule.

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On the Wave Heat Transfer at Times Comparable with the Relaxation Time upon Intensive Convective-Conductive Heating

Cited by 13 publications

References 7 publications

Mathematical Model of Energy Efficiency of Mechatronic Modules and Power Sources for Prospective Mobile Objects

Mathematical Model of Energy Efficiency of Mechatronic Modules and Power Sources for Prospective Mobile Objects

Research of the Problem of Loss of Stability of Cylindrical Thinwalled Structures Under Intense Local Temperature Exposure

Non-Stationary Problem of the Plane Oblique Pressure Wave Diffraction on Thin Shell in the Shape of Parabolic Cylinder

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