Evaluating the reliability of two mathematical models of the pneumatic suspension via two various theoretical approaches

This paper deals with the efficiency of tax collection in the Czech Republic. The first part of this paper describes theoretical approaches to efficiency of taxes. Considering the aim of the article, there are no mathematical models of efficiency presented. The second part introduces efficiency from the point of view of law. The next part involves the application of efficiency of tax collection, especially how to measure efficiency and the main barriers for its establishment in the Czech Republic. The last part of the paper offers the summing up of gained knowledge. The aim of this paper is to detect if the current approach to tax collection contributes to higher efficiency.

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The possibility of using innovative models to refine the most optimal approach to managing the behavior of a commercial organization

Proceedings of the Voronezh State University of Engineering Technologies ◽

10.20914/2310-1202-2021-1-429-434 ◽

2021 ◽

Vol 83 (1) ◽

pp. 429-434

Author(s):

M. L. Lapshina ◽

O. O. Lukina

Keyword(s):

Mathematical Models ◽

Level Structure ◽

Optimal Strategies ◽

Point Of View ◽

Optimal Decision ◽

Demand Model ◽

Theoretical Approaches ◽

Optimal Approach ◽

Economic Functioning ◽

Commercial Organization

Practical modeling uses not only theoretical approaches, but also management issues, therefore, it is not entirely correct to compare theoretical and mathematical models. The concept of demand exists as an independent unit, has an independent meaning, and the demand model is represented in the form of an increasing curve and, like any model, contains various explicit and implicit conditions. The paper provides an analysis of existing classification approaches on the adaptation of economic and mathematical models in the issue of finding the most appropriate criteria for optimality from the point of view of using the mathematical apparatus. A detailed representation of the top-level structure is given, reflecting the basic requirements for the information necessary for drawing up a model passport, and conditions are also given that limit the area of existence of an operator that determines the corresponding payment matrix of an arbitrary game. The possibility of establishing the number of restrictions on the used variants of the game, which does not change the content of the game, is analyzed, which will allow choosing the most optimal strategies for each case. The proposed and justified, from the point of view of mathematical formalization, approach to making the most optimal decision on managing the behavior of a commercial organization based on preliminary monitoring of economic functioning is of interest from the point of view of the following aspects: the possibility of identifying the key elements that determine the system in choosing a format that characterizes the state of the elements of interest; development of a virtual model that reproduces the behavioral features of the modeled system.

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A Diverse Community To Study Communities: Integration of Experiments and Mathematical Models To Study Microbial Consortia

Journal of Bacteriology ◽

10.1128/jb.00865-16 ◽

2017 ◽

Vol 199 (15) ◽

Cited By ~ 18

Author(s):

Antonella Succurro ◽

Fiona Wanjiku Moejes ◽

Oliver Ebenhöh

Keyword(s):

Mathematical Models ◽

Theoretical Models ◽

Theoretical Description ◽

Microbial Interactions ◽

Microbial Consortia ◽

Sequencing Data ◽

Natural Ecosystems ◽

Theoretical Approaches

ABSTRACT The last few years have seen the advancement of high-throughput experimental techniques that have produced an extraordinary amount of data. Bioinformatics and statistical analyses have become instrumental to interpreting the information coming from, e.g., sequencing data and often motivate further targeted experiments. The broad discipline of “computational biology” extends far beyond the well-established field of bioinformatics, but it is our impression that more theoretical methods such as the use of mathematical models are not yet as well integrated into the research studying microbial interactions. The empirical complexity of microbial communities presents challenges that are difficult to address with in vivo/in vitro approaches alone, and with microbiology developing from a qualitative to a quantitative science, we see stronger opportunities arising for interdisciplinary projects integrating theoretical approaches with experiments. Indeed, the addition of in silico experiments, i.e., computational simulations, has a discovery potential that is, unfortunately, still largely underutilized and unrecognized by the scientific community. This minireview provides an overview of mathematical models of natural ecosystems and emphasizes that one critical point in the development of a theoretical description of a microbial community is the choice of problem scale. Since this choice is mostly dictated by the biological question to be addressed, in order to employ theoretical models fully and successfully it is vital to implement an interdisciplinary view at the conceptual stages of the experimental design.

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Dynamic Study on Vehicle Hydro-Pneumatic Suspension

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.2653 ◽

2010 ◽

Vol 139-141 ◽

pp. 2653-2657

Author(s):

Ling Xin Geng ◽

Li Juan Zhang ◽

Ren Zhi Wu

Keyword(s):

Mathematical Model ◽

Computer Simulation ◽

Mathematical Models ◽

Physical Model ◽

Dynamic Load ◽

Special Program ◽

Vehicle Dynamic ◽

Pneumatic Suspension ◽

Working Principle ◽

The Mathematical Model

The performance of HPS directly influences the comfort of vehicle, dynamic load of wheels and travel distance of suspension. In order to describe and evaluate the performance of HPS, the structure and working principle of main parts of the HPS are introduced and analyzed in this paper firstly. Then the physical model is founded by analyzing and simplifying the structure of HPS. According to the physical model, non-linear mathematical models of HPS with dual gas-accumulators are built up and a special program is composed. The results of computer simulation are carried out through the program. Then a testing rig for HPS is designed and manufactured after rebuilding cylinders and abundant experiments are performed on the testing rig. Comparisons are drawn between the results of simulation and testing, which manifest the mathematical model of HPS built in the thesis is feasible.

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Research on Characteristics of Damping Force of Hydro-Pneumatic Suspension

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.42.303 ◽

2010 ◽

Vol 42 ◽

pp. 303-306

Author(s):

Bao Zhan Lü ◽

Ai Jun Hu ◽

Si Hong Zhu

Keyword(s):

Mathematical Models ◽

Theoretical Calculation ◽

Nonlinear Dynamic ◽

Front Axle ◽

Damping Force ◽

Parameter Matching ◽

Pneumatic Suspension ◽

New Type ◽

Working Principle ◽

Set Up

Based on the analysis of vibration characteristics of certain off –road vehicle, and research of effect of front axle suspension to vehicle and parameter matching, a new type of damping-adjustable hydro-pneumatic suspension was put forward. After the analysis of its working principle, the nonlinear dynamic mathematical models of this suspension were set up. Using the method of theoretical calculation and simulation by MATLAB/Simulink, the characteristics of damping force of this damping-adjustable hydro-pneumatic suspension were studied.

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BASICS OF THEORETICAL APPROACHES OF TECHNOLOGICAL PROCESSES WITH REGULAR TOSSING OF THE GRANULAR MEDIUM

Proceedings of the Mongolian Academy of Sciences ◽

10.5564/pmas.v56i4.845 ◽

2017 ◽

pp. 75-88

Author(s):

A V Eliseev ◽

A I Artyunin ◽

S K Kargapolcev ◽

A V Dimov

Keyword(s):

Mathematical Models ◽

Granular Medium ◽

Unilateral Constraints ◽

Dynamic Interactions ◽

Measuring Device ◽

Practical Applications ◽

Technological Processes ◽

Dynamic Synthesis ◽

Theoretical Approaches

Vibration interaction is used for development of modern technological processes in which required quality of product is provided due to interaction of the granular medium with the vibrating surface. The paper is devoted to development of mathematical models and estimation criteria form of movement, taking into account the effect of unilateral constraints, in dynamic interactions of elements of vibration technological processes as applied to increase the reliability and quality of vibrational machines. The study is focused on the formation of theoretical ideas about the dynamic interactions of a solid body with the vibrating surface based on the development of mathematical models by introducing of additional external forces and elastic ties with unilateral contact, including mathematical models of gapless movement of the compounded solids. In terms of practical applications the task is to develop and to approve experimentally the opportunities of the measuring devices fixing the modes of continuous tossing. According to the research the generalized approach to problems of dynamic synthesis of vibration technology implemented in continuous tossing the introduction of additional forces is developed. The basis of the approach is the introduction of the concept of the function of the gap, allowing to justify the construction of forms of motion of material particles in accordance with certain criteria, reflecting the properties of the trajectories of motion of material particles in the interaction with the vibrating surface. The mathematical models to determine the conditions for the formation of dynamic reactions in the vibrational structure consisting of several interconnected elements, including the possibilities of their pre-pressing by elastic ties and power factors is offered. The measuring device fixing the modes of continuous tossing is developed and experimentally approved.

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Pneumatic Vehicular Suspension With a Controllable Stiffness Spring

Volume 2: Automotive Systems, Bioengineering and Biomedical Technology, Fluids Engineering, Maintenance Engineering and Non-Destructive Evaluation, and Nanotechnology ◽

10.1115/esda2006-95400 ◽

2006 ◽

Author(s):

Carlo Ferraresi ◽

Walter Franco ◽

Giuseppe Quaglia ◽

Andrea Morello ◽

Domenico Pierucci

Keyword(s):

Mathematical Models ◽

Compressible Fluid ◽

Air Spring ◽

Dynamic Simulations ◽

Car Model ◽

Pneumatic Suspension ◽

Stiffness Variation

This paper deals with the design of a new vehicular pneumatic suspension. It presents an innovative scheme of suspension, using a special 3-membrane deformable fluid spring. The spring is provided with three internal chambers, supplied by a compressible fluid. Each chamber presents a different volume gradient versus the stroke; a proper variation of the connection between the chambers, that may be performed in few milliseconds, determines a stiffness variation of the air spring. The spring structure and the related mathematical models are presented. Afterwards the process of adaptation of the component to a specific mid-low class car model, in order to achieve a prototypal phase, is described. Finally the results of some dynamic simulations of the car behavior are shown.

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Ensuring the quality and reliability of power equipment components during their production and testing as part of a prototype

Safety and Reliability of Power Industry ◽

10.24223/1999-5555-2020-13-2-91-96 ◽

2020 ◽

Vol 13 (2) ◽

pp. 91-96

Author(s):

V. M. Trukhanov ◽

M. M. Sultanov ◽

Yu. A. Gorban’ ◽

M. P. Kukhtik

Keyword(s):

Mathematical Models ◽

Power Plants ◽

Thermal Power ◽

Quality Parameters ◽

Practical Significance ◽

Thermal Power Plants ◽

Power Equipment ◽

Serial Production ◽

Theoretical Approaches ◽

Quality And Reliability

The object of study is the power equipment of thermal power plants. When developing new parts and components of power equipment, a problem arises of ensuring the quality and reliability at the stage of their putting into production and in the process of serial production. To solve this problem, the following tasks have been set: to develop ways and methods to ensure the quality and reliability of the development batch of equipment; to determine the scope of running-in tests of components as part of a prototype during serial production; to show the influence of production factors on the quality and reliability of the output product; to determine the nomenclature of production quality parameters and their impact on the manufacturability and reliability of products. The scientific novelty consists in generalization of methods, ways, mathematical models for ensuring the quality and reliability of newly created similar products. The theoretical approaches, which are proposed in the article, can be aimed at creation of state-of-art conditions for manufacturing of parts, structures and components of power equipment with new process and material characteristics in terms of reliability. The practical significance is determined by implementation of the developed methods, ways, mathematical models in the normative and technical documentation of newly created equipment. A procedure is described for holding running-in and acceptance tests. The factors, which affect the quality and reliability of components of power equipment of thermal power plants, are considered. Various groups of parameters for assessment of the quality of output products have been described. Equations are presented for calculation of manufacturability parameters, in particular, for labor-intensity, material consumption, material utilization rate, production prime cost, as well as for standardization and unification parameters. Methods are considered for determination of the product quality parameters.

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