scholarly journals ANYLSIS OF PIPE MECHANISM LOCOMOTION

2019 ◽  
pp. 36-42
Author(s):  
Filip Filakovsky ◽  
Ivan Virgala
Keyword(s):  
Mathematical Model ◽  
Target Setting ◽  
Time Consumption ◽  
Long Time ◽  
Cooling Phase ◽  
Two Phases ◽  
Inspection Tasks ◽  
Spring Mechanism ◽  
Actual Target ◽  
The Mathematical Model

Urgency of the research. Inspection tasks are frequently and very important from the view of safety. From this reason the topic is very actual. Target setting. The aim of the study is to investigate new kind of pipe mechanism based on differential frictions of bristles. Actual scientific researches and issues analysis. There are many mechanisms for inspection of narrow or hard-to-reach areas. Many of them are based on wheels or tank belt. This research investigates bristle-based pipe mechanism. Uninvestigated parts of general matters defining. Nowadays, the SMA materials or different kind of memory materials are always in the focus of researchers. The research objective is to develop and experimental test the new kind of mechanism based on SMA as well as steel spring mechanism. The statement of basic materials. The locomotion divided into two phases is introduced. Based on this locomotion the mathematical model was derived. Assuming mathematical model was developed control system for experimental pipe mechanism. Conclusions. The results of the experiments shows problems with cooling phase due to its long time consumption. For cooling was used external device. The cooling phase significantly decrease average velocity of pipe mechanism. The advantage of this kind of mechanism is simple control and utilization for the pipe with small diameters.

Research on cargo-loading optimization based on genetic and fuzzy integration

2021 ◽  
Vol 40 (4) ◽  
pp. 8493-8500
Author(s):  
Yanwei Du ◽  
Feng Chen ◽  
Xiaoyi Fan ◽  
Lei Zhang ◽  
Henggang Liang
Keyword(s):  
Genetic Algorithm ◽  
Mathematical Model ◽  
Three Dimensional ◽  
Distribution Center ◽  
Long Time ◽  
Low Efficiency ◽  
Decision Making Model ◽  
The Mathematical Model ◽  
Loading Scheme

With the increase of the number of loaded goods, the number of optional loading schemes will increase exponentially. It is a long time and low efficiency to determine the loading scheme with experience. Genetic algorithm is a search heuristic algorithm used to solve optimization in the field of computer science artificial intelligence. Genetic algorithm can effectively select the optimal loading scheme but unable to utilize weight and volume capacity of cargo and truck. In this paper, we propose hybrid Genetic and fuzzy logic based cargo-loading decision making model that focus on achieving maximum profit with maximum utilization of weight and volume capacity of cargo and truck. In this paper, first of all, the components of the problem of goods stowage in the distribution center are analyzed systematically, which lays the foundation for the reasonable classification of the problem of goods stowage and the establishment of the mathematical model of the problem of goods stowage. Secondly, the paper abstracts and defines the problem of goods loading in distribution center, establishes the mathematical model for the optimization of single car three-dimensional goods loading, and designs the genetic algorithm for solving the model. Finally, Matlab is used to solve the optimization model of cargo loading, and the good performance of the algorithm is verified by an example. From the performance evaluation analysis, proposed the hybrid system achieve better outcomes than the standard SA model, GA method, and TS strategy.

A New Simple Channel Simulator Based on FPGA

2014 ◽  
Vol 926-930 ◽  
pp. 2329-2332
Author(s):  
Liu Yu ◽  
Lei Cheng Chen ◽  
Ming Li ◽  
Peng Rui Wang
Keyword(s):  
Mathematical Model ◽  
Channel Model ◽  
Channel Modeling ◽  
Complex Theory ◽  
Design Cycle ◽  
Long Time ◽  
Comparison And Analysis ◽  
The Mathematical Model ◽  
Channel Simulator

Through detailed research on the channel modeling, this paper proposes a new simple channel model to solve the difficult of the complex theory and long time design cycle modeling such as SCM, SCME and the WINNERII models. This paper has constructed the mathematical model, and then simulated and analyzed it based on the Matlab, and finally realized the channel simulator based on FPGA. After that, through the comparison and analysis, we can guarantee the practicability and reliability of this simulator.

Numerical Statistical Estimates of Ship Broaching-To

2016 ◽  
Vol 60 (04) ◽  
pp. 219-238
Author(s):  
K. J. Spyrou ◽  
N. Themelis ◽  
I. Kontolefas
Keyword(s):  
Mathematical Model ◽  
Normal Distribution ◽  
Wave Excitation ◽  
Simple Method ◽  
Statistical Estimates ◽  
Long Time ◽  
Surf Riding ◽  
Yaw Angle ◽  
The Mathematical Model ◽  
Cumulative Time

Ship "high-run" incidents in irregular following/quartering seas, in particular their correlation with broaching-to behavior, are investigated, aiming to produce statistical evidence about this connection. A simple linear mathematical model of the yaw and sway motions has been combined with a nonlinear surge equation that is often applied in surf-riding investigations, considering multifrequency wave excitation derived from a spectrum. Types of yaw instability are conjectured from the structure of the mathematical model. The concept of instantaneous celerity is used for formally recognizing the occurrence of high-run and a simple method is proposed for its calculation. Problem's rarity (i.e., whether few only or a large number of broaching-to incidents are recorded during long-time simulations) is controlled by using the rudder control gains as "rarity knobs." Expectations of broaching-to, with and without conditioning on high-run incidence, are presented. Histograms of cumulative time of high-run and limiting yaw angle exceedance are produced and the fitting of standard distributions, variants of the normal distribution, are discussed.

Study on Mechanics Properties of Shifting Impact of Overrunning AMT

2012 ◽  
Vol 252 ◽  
pp. 134-139
Author(s):  
Jian Jun Hao ◽  
Shuai Shuai Ge ◽  
Xi Hong Zou ◽  
Xiao Hui Ding
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Dynamic Model ◽  
Structural Characteristics ◽  
Transmission System ◽  
Separation Process ◽  
Force Analysis ◽  
Long Time ◽  
Simulation Results ◽  
The Mathematical Model

Aiming at the problem of long time power interruption and clutch master-slave friction plates wore seriously which greatly shorten the life of clutch during shifting process of AMT, a overrunning AMT without separation process of clutch when shifting is designed. This paper has analyzed structural characteristics and shift principle of overrunning AMT. Through force analysis on the jointing process of roller overrunning clutch, the mathematical model and dynamic model of transmission system are established. Finally, the shifting impact of shifting process is analyzed based on computer simulation. The simulation results indicate that vehicle longitudinal degree of jerk meets the requirement of vehicle comfort.

The Application of Simulation Technology in the Inventory System

2013 ◽  
Vol 380-384 ◽  
pp. 1473-1476
Author(s):  
Zhan Li ◽  
Da Shen Xue
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Simulation Software ◽  
Simulation Technology ◽  
Mathematical Methods ◽  
Logistics System ◽  
Modeling Simulation ◽  
Modern Computer ◽  
Long Time ◽  
The Mathematical Model

For a long time, the mathematical model is used to describe the systems characteristics and acquire the solutions, so it gradually develops into a modern computer simulation technology, and it can be used to solve many problems which are complex and unable resolve use mathematical methods. Witness modeling simulation software is applied in this article, and examples analysis is put forward in view of the logistics system of inventory control, finally making the models on the part of the module, whats more, it analysis the data and makes the optimal strategy.

The geometrical representation of fault-plane solutions of earthquakes

1957 ◽  
Vol 47 (2) ◽  
pp. 89-110 ◽  
Author(s):  
Adrian E. Scheidegger
Keyword(s):  
Mathematical Model ◽  
North America ◽  
Infinite Number ◽  
Fault Plane ◽  
Stereographic Projection ◽  
Fault Plane Solutions ◽  
Plausible Assumption ◽  
Long Time ◽  
First Motion ◽  
The Mathematical Model

Abstract Investigations into the mechanism at the focus of an earthquake have been in progress for a long time. In the course of these investigations it has been demonstrated that the mathematical model of a simple fault is a plausible assumption, at least so far as the explanation of the direction of first motion at distant seismic observatories is concerned. Various methods have been devised for representing and determining the elements of the focal fault of an earthquake, by investigators in Japan, Holland, North America, Italy, and Russia. It is often very difficult to see the connection between the various representations, and the present paper has been undertaken to demonstrate the relationships between them and to devise corresponding “translation schemes.” It is shown that there exists an infinite number of representations of fault-plane solutions all of which satisfy certain basic requirements. However, only four thereof have reached any popularity. It is shown that three of these four representations are entirely equivalent. In each, one uses a sphere; in each, one uses some stereographic projection of this sphere; and in each, one substitutes the tangent to the seismic ray at the focus for the ray itself. Whether one tabulates the angle i which that tangent makes with the vertical and plots tan i/2, as Ritsema and most Russians do, or whether one tabulates and plots tan i, as some of the Russians do, or tabulates and plots cot i, as Hodgson and his various co-workers do, one obtains identical results with equivalent amounts of work. What particular representation anyone will choose for studying an earthquake will therefore depend largely on his taste and previous custom.

Simulation of the Ductile Iron Solidification Using a Cellular Automaton

2010 ◽  
Vol 457 ◽  
pp. 330-336 ◽  
Author(s):  
Andriy A. Burbelko ◽  
Edward Fraś ◽  
Daniel Gurgul ◽  
Wojciech Kapturkiewicz ◽  
Jorge Antonio Sikora
Keyword(s):  
Mathematical Model ◽  
Cellular Automaton ◽  
Ductile Iron ◽  
Calculation Method ◽  
Eutectic Composition ◽  
Eutectic Solidification ◽  
Proposed Model ◽  
Two Phases ◽  
The Mathematical Model ◽  
Method Model

The mathematical model of the globular eutectic solidification in 2D was designed. Pro¬posed model is based on the Cellular Automaton Finite Differences (CA-FD) calculation method. Model has been used for studies of the primary and of globular eutectic grains growth during the ductile iron (DI) solidification. A hyper-eutectic composition has been analyzed but this model can be used in the solidification modeling of hypo- and eutectic DI. The proposed model makes possible to trace the unrestricted growth of primary grains of two phases from the liq¬uid, transition from free to cooperative solidification, and cooperative growth of globular eutectic.

scholarly journals Analysis of asymptotic for a model of nonlinear oscillations of the two string

2015 ◽  
Vol 56 ◽  
Author(s):  
Olga Lavcel-Budko ◽  
Aleksandras Krylovas
Keyword(s):  
Mathematical Model ◽  
Asymptotic Solution ◽  
Nonlinear Oscillations ◽  
Time Interval ◽  
Long Time ◽  
The Mathematical Model

The mathematical model of two strings nonlinear oscillations is presented. To find uniformly valid in a long time interval asymptotic solution of the problem an averaging scheme is constructed.

scholarly journals Asymptotic investigation of a nonlinear model of string vibrations

2016 ◽  
Vol 57 ◽  
Author(s):  
Olga Lavcel-Budko ◽  
Aleksandras Krylovas ◽  
Paulius Miškinis
Keyword(s):  
Mathematical Model ◽  
Small Parameter ◽  
Asymptotic Approximation ◽  
Nonlinear Oscillations ◽  
Time Interval ◽  
System A ◽  
String Vibrations ◽  
Asymptotic Investigation ◽  
Long Time ◽  
The Mathematical Model

The mathematical model of nonlinear oscillations of a weightless string is analysed. The uniformly valid asymptotic approximation in the long time interval, which is inversely proportional to the small parameter, is constructed. This asymptotic approximation is a solution of averaged along characteristics integro-differential system. A method for constructing special approximations of its solutions is proposed.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

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