scholarly journals The Logic of Approximate Dependence

2017 ◽  
pp. 227-234 ◽  
Author(s):  
Jouko Väänänen
Keyword(s):  
Approximate Dependence

scholarly journals MODELING OF OPERATING MODES GAS COMPOSITE CYLINDERS

2021 ◽  
pp. 63-74
Author(s):  
N. N. Osipova ◽  
B. M. Grishin
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cylinder Wall ◽  
Operating Modes ◽  
Hydrocarbon Gas ◽  
Gas Consumption ◽  
Approximate Dependence ◽  
The Heat Transfer Coefficient ◽  
Composite Cylinders

Statement of the problem. The emergence of composite cylinders on the market offers a range of technological and operational advantages in comparison with metal cylinders of liquefied hydrocarbon gas. At the same time, the absence of substantiated recommendations for determining the vapor capacity of cylinders by modes of their operation in the scientific literature limits their wide implementation into gas practice. Results. A mathematical model considering the operation of the cylinder in the mode of periodic gas consumption is developed, the coefficient of non-uniformity of gas consumption during the day is calculated, the values of the heat transfer coefficient of the composite cylinder wall are identified, the approximate dependence of the heat transfer coefficient is obtained. Conclusions. As a result of the research, the criteria influencing steam productivity of compositecylinders of the liquefied hydrocarbon gas in various operating modes are found.

Modeling of Operating Modes Gas Composite Cylinders

2021 ◽  
pp. 49-59
Author(s):  
Н. Н. Осипова ◽  
Б. М. Гришин
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cylinder Wall ◽  
Operating Modes ◽  
Hydrocarbon Gas ◽  
Gas Consumption ◽  
Approximate Dependence ◽  
The Heat Transfer Coefficient ◽  
Composite Cylinders

Состояние проблемы. Появление на рынке композитных баллонов обеспечивает ряд технологических и эксплуатационных преимуществ по сравнению с металлическими баллонами сжиженного углеводородного газа. В то же время отсутствие в научной литературе обоснованных рекомендаций по определению паропроизводительности баллонов по режимам их эксплуатации ограничивает их широкое внедрение в газовую практику. Результаты. Разработана математическая модель, учитывающая эксплуатацию баллона в режиме периодического газопотребления, рассчитан коэффициент неравномерности газопотребления в течение суток, определены значения коэффициента теплопередачи стенки композитного баллона, получена аппроксимирующая зависимость коэффициента теплопередачи от уровня заполнения баллона газом. Выводы. В результате проведенных исследований установлены критерии, влияющие на паропроизводительность композитных баллонов сжиженного углеводородного газа в различных режимах эксплуатации. Statement of the problem. The emergence of composite cylinders on the market offers a range of technological and operational advantages in comparison with metal cylinders of liquefied hydrocarbon gas. At the same time, the absence of substantiated recommendations for determining the vapor capacity of cylinders by modes of their operation in the scientific literature limits their wide implementation into gas practice. Results. A mathematical model considering the operation of the cylinder in the mode of periodic gas consumption is developed, the coefficient of non-uniformity of gas consumption during the day is calculated, the values of the heat transfer coefficient of the composite cylinder wall are identified, the approximate dependence of the heat transfer coefficient is obtained. Conclusions. As a result of the research, the criteria influencing steam productivity of composite cylinders of the liquefied hydrocarbon gas in various operating modes are found.

Vibration of Containing Structures by Sound in the Contained Fluid

1969 ◽  
Vol 91 (4) ◽  
pp. 939-950
Author(s):  
F. J. Fahy
Keyword(s):  
Mode Coupling ◽  
Free Field ◽  
Density Ratio ◽  
Radiation Efficiency ◽  
Low Frequencies ◽  
Simply Supported ◽  
A Value ◽  
Modal Density ◽  
Flexible Wall ◽  
Approximate Dependence

A system which consists of a rigid rectangular box with one simply supported flexible wall is analyzed by numerical and statistical methods for the internal acoustostructural mode coupling factors and the corresponding modal average radiation efficiency. It is found that for subcritical frequencies, but above a frequency which corresponds to the lower limit for maximum proximate mode coupling, the radiation efficiency is equal to that of a baffled panel radiating into a free field. At supercritical frequencies a value of radiation efficiency half that of a freely radiating panel is found. Below the limiting frequency an approximate dependence upon (f/fc)3 is found experimentally in all cases. The same type of behavior has been observed with an internally excited, partically closed cylinder. The radiation efficiency of a clamped panel is calculated to be about 3 db greater than that of the simply supported panel at low frequencies. This factor falls to zero at the critical frequency and above. Corrections to the normal statistical energy response and radiation equations are presented which take into account the fact that it may not be assumed, purely on the basis of modal density ratio considerations, that many acoustic modes couple with an individual structural mode.

scholarly journals INTELLIGIBILITY OF THE KAZAKH SPEECH WHEN IT'S PROTECTED WITH COMBINED MASKING SIGNALS

Doklady BGUIR ◽  
2020 ◽  
pp. 67-73
Author(s):  
Y. N. Seitkulov ◽  
S. N. Boranbayev ◽  
H. V. Davydau ◽  
A. V. Patapovich
Keyword(s):  
Spectral Density ◽  
White Noise ◽  
Speech Intelligibility ◽  
Experimental Studies ◽  
Russian Language ◽  
Articulation Index ◽  
Phonetic Features ◽  
Approximate Dependence ◽  
Speech Information ◽  
The Russian Language

The article is devoted to assessing the intelligibility of the Kazakh speech when it's masked by combined signals, including «white» noise and speech-like signals. The phonetics features of the Kazakh language have been considered taking into account the law of syngarmonism and the spectrum differences of speech in the Kazakh language and speech in the Russian language. A technique for assessing the intelligibility of the Kazakh speech when it's masked by «white» noise and speech-like signals is proposed. The aim of the work is to analyze well-known methods for speech intelligibility assessing and applying these methods to assess speech intelligibility in the Kazakh language, taking into account masking by its combined signals. Due to the fact that the use of the articulation method of assessing intelligibility for the Kazakh speech requires a dependence of intelligibility on the articulation index for this particular language (the application for the Kazakh language has not been experimentally tested), the use of the formant approach to speech intelligibility assessing will be examined in more detail. The curried out experimental studies of the spectral density of speech in the Kazakh language made it possible to obtain it's approximate dependence on the frequency and take into account the phonetic features of the Kazakh speech when assessing the security of the speech information using the formant method.

scholarly journals Analyzing building materials and their properties in connection with the theory of experiment planning

2018 ◽  
Vol 196 ◽  
pp. 04009
Author(s):  
Tatiana Dormidontova ◽  
Anastasiya Filatova
Keyword(s):  
Building Materials ◽  
Experiment Planning ◽  
Future Planning ◽  
Order Model ◽  
First Order ◽  
Screening Experiments ◽  
Approximate Dependence ◽  
Number Of Publications ◽  
Two Stages ◽  
Economic Considerations

The task of planning an experiment can be divided into two stages: screening experiments conducting, step-by-step experiments performed on complete factorial design or on fractional replicates. As the number of publications on the practical use of plans-experiments in construction is insufficient, the paper presents appropriate recommendations in common form. Screening experiments are usually conducted with the aim of approximate orientation among many factors and for more precise future planning. These experiments can be carried out on the minimum fractional replicates making it possible to obtain the first order model. After obtaining the model, the factors that are included in it are appropriately ranked. Using the results of ranking, researchers take into account economic considerations, leave away unimportant factors and conduct experiments with remaining factors to obtain a mathematical model of the process. In order to find out the nomenclature of these factors, screening experiments are carried out. These experiments are performed to obtain an approximate dependence between the outcome of the process and the factors. This dependence is used to determine the influence that each of the factors has on the experience result. When the crucial factors are considered, it is possible to plan the basic experiment.

Monitoring Point Configuration of Gearbox Based on EEMD and VPRS

2013 ◽  
Vol 347-350 ◽  
pp. 237-240
Author(s):  
Hui Ling Liu ◽  
Hong Xia Pan ◽  
Ai Yu Wang
Keyword(s):  
Fault Diagnosis ◽  
Empirical Mode Decomposition ◽  
Rough Set ◽  
Ensemble Empirical Mode Decomposition ◽  
Decision Table ◽  
Monitoring Point ◽  
Mode Decomposition ◽  
Fault Diagnosis System ◽  
Variable Precision Rough Set ◽  
Approximate Dependence

To gain the sensitive fault information, proper sampling point configuration is essential and important. A method based on ensemble empirical mode decomposition and variable precision rough set is proposed to optimize the monitoring points in the gearbox fault diagnosis system. First, the vibration signal was processed by ensemble empirical mode decomposition, the energetic characteristic vector can be got by the intrinsic mode functions. Samples in different conditions constructed the decision table, each monitoring point corresponded to a decision table. Second, the approximate dependence values of condition attributes to decision attributes of every monitoring point were got by variable precision rough set. Finally, the importance of the sampling points was achieved by the approximate dependence value. The experimental results show the method is effective and feasible for the monitoring points configuration, and it can minimize the impact of noise as well as improve the efficiency and accuracy of the fault diagnosis system.

PARAMETRIC OPTIMIZING ANALYSIS OF UNSTEADY STRUCTURES AND VISUALIZATION OF MULTIDIMENSIONAL DATA

2013 ◽  
Vol 04 (supp01) ◽  
pp. 1341004 ◽  
Author(s):  
A. E. BONDAREV ◽  
V. A. GALAKTIONOV
Keyword(s):  
Optimization Problem ◽  
Visual Presentation ◽  
Analytical Form ◽  
Multidimensional Data ◽  
Problem Solution ◽  
Characteristic Parameters ◽  
Approximate Estimation ◽  
Time Structures ◽  
Presentation Methods ◽  
Approximate Dependence

The paper presents an approach to fast approximate estimation of conditions for space-time structures appearing in the flows. The approach is based on combination of optimization problem computation with methods of data visual presentation. The visual presentation methods are applied for analysis of multidimensional array containing discrete result data. Optimization problem solution is implemented by parallel computation in a multitask form. For some cases, the approach allows to obtain for control parameter of considered problem the sought-for approximate dependence on characteristic parameters in a quasi-analytical form.

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