Analysis of Methods for Solution of Differential Equations of Motion of Inertial Continuously Variable Transmissions

Aliukov, Sergei; Alyukov, Alexander

doi:10.4271/2017-01-1105

Cited by 10 publications

(7 citation statements)

References 15 publications

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“…As a result of the analytical calculations, the dependence of the parameters of a heterogeneous flame on the mathematical description of the fractional composition of coal dust was substantiated; The characteristics of the combustion process that were previously not taken into account in the theory of heat transfer were revealed; theoretically confirmed new methodological approaches to the theory of heat transfer in the furnace of the boiler unit [28,29].…”

Section: Practical Applicationmentioning

confidence: 78%

Analysis of the calculated and experimental dependencies of the combustion of coal dust on the basis of a new methodological base of theoretical studies of heat exchange processes

Toropov¹,

Осинцев²,

Aliukov³

2018

IJHT

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The methodology of theoretical studies of heat exchange processes in boiler units based on the mathematical model of burning coal dust has been developed. For the first time, the continuous curve of the fractional composition of an ensemble of coal particles is presented. The mathematical model is consistent with the aeromechanical and thermal characteristics of the torch, obtained on the basis of calculated and experimental data. The concept of a torch continuum is introduced as a continuous medium in which the processes of combustion and heat exchange are investigated. The methods of dividing the combustion chamber into zones, the equations of stationary and non-stationary heat conduction, radiation and convective heat exchange are used. These methods have been tested on a number of high-temperature installations, including boilers with natural circulation, for example, E-220 at the CHP plant in Bishkek, Kyrgyz Republic in the Central Asian region. In the course of the experiments, coals with different thermal characteristics were burned. In a special computer program obtained a 3D image of burning coal dust. Analysis of the calculated and experimental data showed a discrepancy between them of 4-5%. Analysis of computer simulation data showed a discrepancy with the calculated data of 3-4%, and with experimental 5-6%. Thus, the dependence of the parameters of the heterogeneous flame on the mathematical description of the fractional composition of coal dust is substantiated and the characteristics of the combustion process, previously not taken into account in the theory of heat transfer, are revealed. The task was solved-theoretically confirmed new methodological approaches to the theory of heat transfer in the furnace of the boiler unit.

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Section: Practical Applicationmentioning

confidence: 78%

Analysis of the calculated and experimental dependencies of the combustion of coal dust on the basis of a new methodological base of theoretical studies of heat exchange processes

Toropov¹,

Осинцев²,

Aliukov³

2018

IJHT

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“…The results of theoretical studies were checked by the authors at operating thermal power plants, in particular, when burning coal dust in E-160 boilers. In the laboratory of thermal power engineering of the scientific and technical center under the Ministry of Energy of the Kyrgyz Republic, comparative analyzes [28] and experimental studies were conducted on samples of coal dust of various compositions. The movement of coal dust through the sampling tubes of devices, as well as the degree of grinding in roller and hammer mills was taken into account.…”

Section: Validation Of the Resultsmentioning

confidence: 99%

New Theoretical and Methodological Approaches to the Study of Heat Transfer in Coal Dust Combustion

2019

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The existing theories of heat transfer in combustion chambers of boiler units fail to take into account a number of important factors that affect the reliability of results, and the methodological approaches to optimizing combustion processes can be revised in view of the spatial and temporal parameters of flame. Hence, the research aimed to improve the fundamental theoretical and methodological principles of studying heat transfer in coal dust combustion in the combustion chambers of industrial steam generators. The authors proposed to extend the theory of heat transfer with the mathematical description of particle size distribution of coal dust. In addition, the authors used the developed mathematical model of coal dust combustion based on a continuous curve of the particle size distribution in the ensemble. The mathematical model is consistent with the aeromechanical and thermal characteristics of flame. This work introduced a concept of flame continuum as a continuous medium, where the processes of combustion and heat transfer are studied. To achieve the research aim, in this paper, the methods of combustion chamber zoning, the equations of stationary and non-stationary heat conduction, radiation, and convective heat transfer, were used. These methods were tested on a number of high-temperature units.

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“…Servomotors are generally used in this design, the following works on such shock absorbers are most notable: [7][8][9]. Solenoid valves are also often used in the construction of shock absorbers [8][9][10][11][12][13][14]. The next step in the development of semi-active shock absorbers is the usage of valves that allow dissipative characteristics to change continuously [15,16].…”

Section: Introductionmentioning

confidence: 99%

Active Shock Absorber Control Based on Time-Delay Neural Network

2020

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A controlled suspension usually consists of a high-level and a low-level controller. The purpose the high-level controller is to analyze external data on vehicle conditions and make decisions on the required value of the force on the shock absorber rod, while the purpose of the low-level controller is to ensure the implementation of the desired force value by controlling the actuators. Many works have focused on the design of high-level controllers of active suspensions, in which it is considered that the shock absorber can instantly and absolutely accurately implement a given control input. However, active shock absorbers are complex systems that have hysteresis. In addition, electro-pneumatic and hydraulic elements are often used in the design, which have a long response time and often low accuracy. The application of methods of control theory in such systems is often difficult due to the complexity of constructing their mathematical models. In this article, the authors propose an effective low-level controller for an active shock absorber based on a time-delay neural network. Neural networks in this case show good learning ability. The low-level controller is implemented in a simplified suspension model and the simulation results are presented for a number of typical cases.Energies 2020, 13, 1091 2 of 16 of a semi-active shock absorber lies in I and III quadrants; thus, the force vector F is always in one direction with the velocity vector v.Energies 2020, 13, 1091 2 of 15In an active shock absorber, the set of dissipative characteristics cover all IV quadrants due to an external energy source, and force and velocity vectors can be oppositely directed. This property is the great advantage of active shock absorbers, and it allows, in theory, the achievement of a complete absence of movement of the vehicle body for the given planes.

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Analysis of Methods for Solution of Differential Equations of Motion of Inertial Continuously Variable Transmissions

Cited by 10 publications

References 15 publications

Analysis of the calculated and experimental dependencies of the combustion of coal dust on the basis of a new methodological base of theoretical studies of heat exchange processes

Analysis of the calculated and experimental dependencies of the combustion of coal dust on the basis of a new methodological base of theoretical studies of heat exchange processes

New Theoretical and Methodological Approaches to the Study of Heat Transfer in Coal Dust Combustion

Active Shock Absorber Control Based on Time-Delay Neural Network

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