scholarly journals Influence of Cable Length on the Vibrating Wire Sensors Dynamic Measurements

2018 ◽  
Vol 64 (4) ◽  
pp. 65-76
Author(s):  
G. Cieplok ◽  
W. Karwowski ◽  
Ł. Bednarski
Keyword(s):  
Mathematical Model ◽  
Measuring System ◽  
Dynamic Measurements ◽  
Vibrating Wire ◽  
Cable Length ◽  
The Subject ◽  
Impedance Parameters ◽  
Electric Cables ◽  
The Mathematical Model ◽  
Theoretical Analyses

Abstract The hereby paper discusses the influence of cable length on the SHM systems with the use of vibrating wire dynamic measurements. Vibrating wire sensors are mainly used for measuring stable or slowly changing strains, e.g. system installed on Rędziński Bridge in Wroclaw. From some time applications of these sensors for measuring dynamic deformations are becoming popular. Such tests were conducted on STS Fryderyk Chopin. New solutions generate new problems. In this case: the operational stability of systems exciting wire vibrations. The structure of such sensors and the electric cables length has an essential influence on their operations, what is undertaken in the paper. The subject of investigations constitutes the measuring system based on self-exciting impulse exciter, for which impedance parameters of electric cables and of the vibrating wire sensor were the most essential. The mathematical model of the system, experimental verification of the model as well as the results of theoretical analyses at the application of electric cables of various lengths are presented in the paper.

scholarly journals Experimental verification of the properties of pneumatic elements

2018 ◽  
Vol 180 ◽  
pp. 02027
Author(s):  
K. Fojtášek ◽  
L. Dvořák ◽  
Š. Chmura
Keyword(s):  
Mathematical Model ◽  
Experimental Verification ◽  
Theoretical Data ◽  
Measured Data ◽  
Measuring System ◽  
The Subject ◽  
Potential Impact ◽  
The Mathematical Model

The subject of this article is experimental verification of properties of pneumatic elements. These elements have been a part of equipment for measuring of rotary air motors parameters. When comparing the measured data with the mathematical model, there were slight variations. The main objective is to verify the correct functioning of these pneumatic elements, comparing the measured results with theoretical data from the catalogs of manufacturers and determine their potential impact on the entire measuring system.

scholarly journals Measurements of Dynamic Deformations of Building Structures by Applying Wire Sensors

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 255
Author(s):  
Grzegorz Cieplok ◽  
Łukasz Bednarski
Keyword(s):  
Measurement System ◽  
Time Variable ◽  
Building Structures ◽  
Vibrating Wire ◽  
Measuring Time ◽  
Long Time ◽  
The Subject ◽  
Electric Cables ◽  
Proper Operation ◽  
Theoretical Analyses

Measurements of deformations by means of vibrating wire sensors are very important in the monitoring of building structures. These types of sensors are characterized by a high resistance to environmental conditions, long time of measurement stability, and a possibility to use long electric cables with a solid encasement in concrete. Vibrating wire sensors are mainly used for measuring stable or slowly changing deformations, however applications of these sensors for measuring time-variable deformations are becoming popular. New solutions generate new problems, which in case of vibrating wire sensors are mainly related to the operational stability of the systems exciting wire vibrations. The structure of such sensors and the length of the electric cables, which can reach a few kilometers, have an essential influence on their operations. This paper undertakes the task of determining the influence of the electric cables length on the proper operation of the measurement system and provides advice for improvements of its measurement possibilities. The subject of investigation constitutes a measurement system based on a self-exciting impulse exciter, for which the impedance of the electric cables and of the vibrating wire sensor are the most essential parameters. A mathematical model of this system, experimental verification of the model, and the results of theoretical analyses and measurement tests for electric cables of various lengths are presented in this paper.

scholarly journals Methodological Aspects of Allocation of Categories of Medical and Psychological Support of Students

2016 ◽  
Vol 5 (2) ◽  
pp. 113-120
Author(s):  
I. Dorofeev ◽  
V.A. Korzunin ◽  
B. Ovchinnikov ◽  
V. Yusupov ◽  
A. Yatmanov
Keyword(s):  
Mathematical Model ◽  
Intellectual Development ◽  
Psychological Support ◽  
Methods Of Calculation ◽  
Correction Program ◽  
The Subject ◽  
Military College ◽  
Methodological Aspects ◽  
The Military ◽  
The Mathematical Model

Present article considers mathematical model of separation category of medical and psychological support of students and candidates entering the military college. The mathematical model is based on a discriminant analysis, it comprises two calculation methods: a methodology to assess the adaptation abilities of personal and intellectual development of a common methodology for assessment of the subject. According to the results of the survey of methods of calculation is determined by the category of person medical and psychological support. Category medical and psychological support corresponds to the worst results of the general intellectual development or adaptation of personal abilities. Category determines the order of enrollment of the subject in the military college. Candidates for admission to military school with the 1st category are recommended in the first place, from the 2nd - recommended, with 3rd - recommended conditionally, with the 4th category for admission are not recommended. With cadets medical and psychological support category determines individually tailored correction program.

scholarly journals Dewaxing models digitalization in the mathematical model of winter diesel fuel production

2021 ◽  
Vol 258 ◽  
pp. 11004
Author(s):  
Valentin Nikonorov ◽  
Andrei Kutuzov ◽  
Viktor Nikonorov ◽  
Irina Bagaeva ◽  
Anna Letta
Keyword(s):  
Mathematical Model ◽  
Diesel Fuel ◽  
Optimization Theory ◽  
Oil Refining ◽  
The Arctic ◽  
Fuel Production ◽  
Main Research ◽  
Retrospective Data Analysis ◽  
The Subject ◽  
The Mathematical Model

The climatic features of Russia, as well as the need for the development of the Arctic and the Great Northern Sea Route, require an increase in the production of winter diesel fuel. The object of the study is obtaining winter diesel fuel. The subject of the study is digitalizing oil-refining processes by building the mathematical model of winter diesel fuel production for the case of combining dewaxing regimes taking into account the logistical aspect. Main research methods: retrospective data analysis, synthesis, comparison, optimization theory methods. A literary review was carried out, the main methods for improving the low-temperature properties of winter diesel fuel were revealed. Study hypothesis: a combination of dewaxing regimes will increase the yield of denormalizate and, accordingly, winter diesel fuel. The authors for each mode of dewaxing compiled a mathematical model. Then, the authors constructed a mathematical model of obtaining winter diesel fuel for a combination of dewaxing regimes and taking into account the logistical aspect. The obtained mathematical model can be used to obtain the required amount of winter diesel fuel with compliance with quality requirements and taking into account the logistical aspect.

The Construction of Mathematical Model for Electromagnetic Torque Online Measuring System with Three-Phase Induction Motor

2011 ◽  
Vol 71-78 ◽  
pp. 4252-4255
Author(s):  
Qing Bo Meng ◽  
Gui Xiang Zhang
Keyword(s):  
Mathematical Model ◽  
Induction Motor ◽  
Coordinate Transformation ◽  
Measuring System ◽  
Electromagnetic Torque ◽  
Motor Torque ◽  
Three Phase ◽  
Practical Engineering ◽  
The Mathematical Model

Based on the coordinate transformation, the paper analyzes and constructs the mathematical model for electromagnetic torque online measuring system with three-phase induction motor. Additionally, the author proposes the improved scheme for model limitations. The system can meet the random and fast requirements on the occurrence and measurement of the three-phase induction motor torque and has high practical engineering value.

scholarly journals Analysis, Mathematical Model and Simulation Tests of the Unmanned Aerial Vehicle Control System

2019 ◽  
Vol 24 ◽  
pp. 01005
Author(s):  
Lucjan Setlak ◽  
Rafał Kowalik
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Unmanned Aerial Vehicle ◽  
Dynamic Control ◽  
Vehicle Control ◽  
Model And Simulation ◽  
Aerial Vehicle ◽  
The Subject ◽  
Dynamic Control System ◽  
The Mathematical Model

The subject of this paper is to analyze, create a dynamic mathematical model and, on this basis, conduct simulation tests of the control system used in unmanned aerial vehicles. The key objective of the work is to develop a mathematical model of a control system based on the conducted studies of P, PI and PID regulators. The summary of this article are selected simulation tests of the proposed unmanned aerial vehicle (UAV) control system based on the analysis performed, the mathematical model developed for the dynamic control system and based on them, drawing practical conclusions.

scholarly journals ТОВАРОЗНАВЧА ОЦІНКА АНТИКВАРНОЇ МАЛОЇ ТА МІНІАТЮРНОЇ ПЛАСТИКИ З КІСТКИ ТА ДЕРЕВА

2019 ◽  
Vol 1 (12) ◽  
pp. 127-146
Author(s):  
Editor Editor
Keyword(s):  
Mathematical Model ◽  
Regression Analysis ◽  
Wood Products ◽  
Standard Methods ◽  
Current State ◽  
The Subject ◽  
The Creation ◽  
Cost Forecasting ◽  
The Cost ◽  
The Mathematical Model

Мета. Дослідження основних засад щодо проведення товарознавчої оцінкиантикварної малої та мініатюрної пластики з кістки та дерева, а також здійсненняпрогнозування їх ліквідаційної вартості.Методика. Для товарознавчої оцінки антикварної малої та мініатюрної пластикиз кістки та дерева було використано стандартні методи регресійного аналізу.Результати. Описано повний перелік процедур та розрахунків, що необхідні длявиконання товарознавчої оцінки антикварних виробів із слонової кістки та цінних сортівдерева, а також для здійснення прогнозування їх ліквідаційної вартості.Продемонстровано значення результатів аналізу поточного стану ринку спорідненихпредметів для створення колекції еталонів й подальшого її використання для виконанняоперацій порівняння. Подано приклад розрахунків прогнозованої вартості з використаннямзапропонованої авторами математичної моделі, що є цілком придатної для практичноговикористання в завданнях прогнозування вартості високохудожніх виробів з слоновоїкістки та цінних сортів дерева на міжнародному ринку. Під час проведення товарознавчоїоцінки антикварної малої та мініатюрної пластики з кістки та дерева запропоновановикористовувати питомі показники вартості, визначені як відношення вартостіпредмета до його діагонального брутто розміру. Процедура оцінки якості тапрогнозування вартості не враховує емоційного ефекту, який твір мистецтва справляє напотенційного покупця, але вона враховує його фінансові можливості.Наукова новизна. Запропоновано поділ вартісних показників малої та мініатюрноїпластики з кістки та дерева на товарознавчі групи та запровадження питомих показниківвартості, визначених як відношення вартості предмета до його діагонального брутторозміру.Практична значимість. Розроблено порядок розрахунку питомого показникапоточної вартості малої та мініатюрної пластики з кістки та дерева: відношеннязадекларованої вартості до діагонального брутто-розміру предмета, що дозволяє враховувати розміри виробів в процедурах оцінки, адже вони є показовими відноснозагальної оцінки технічної складності роботи зі створення предмету. Purpose. Investigation of the main principles for commodity evaluation of antique smalland miniature plastics from bone and wood, as well as forecasting of their liquidation value.Methodology. Standard methods of regression analysis were used for the commodityevaluation of antique small and miniature bone and wood plastics.Results. A complete list of procedures and calculations necessary for carrying outcommodity evaluation of antique ivory products and valuable wood articles, as well as forforecasting of their liquidation value, is described. It is demonstrated the significance of theanalysis results of the market related items current state for the creation of a collection ofstandard models and its further use for performing of comparative operations. An example ofcalculations of the forecast value is presented using the mathematical model proposed by theauthors, which is quite suitable for practical use for the cost forecasting of high-art ivory andvaluable wood products on the international market.Scientific novelty. It is proposed the division of cost indicators of small and miniaturebone and wood plastics into commodity groups and the introduction of specific values of value,determined as the ratio of the value of the object to its diagonal gross size.Practical value. The procedure for the specific indicator of the current cost of small andminiature bone and wood plastics calculation: the ratio of the declared value to the diagonalgross-size of the object, which allows to take into account the products size in the evaluationprocedures, as they are indicative of the overall assessment of the technical complexity of thework on the creation of the subject.

Optimizing laser triangulation displacement sensor of 3D positioning and posture using COA Based BPNN

Sensor Review ◽  
2020 ◽  
Vol 40 (1) ◽  
pp. 112-120
Author(s):  
Yassine Selami ◽  
Na Lv ◽  
Wei Tao ◽  
Hongwei Yang ◽  
Hui Zhao
Keyword(s):  
Mathematical Model ◽  
Measuring System ◽  
Displacement Sensor ◽  
Laser Triangulation ◽  
Content Type ◽  
Depth Measurement ◽  
Displacement Sensors ◽  
Wide Range ◽  
3D Positioning ◽  
The Mathematical Model

Purpose The purpose of this paper is to propose cuckoo optimization algorithm (COA)-based back propagation neural network (BPNN) to reduce the effect of the nonlinearities presented in laser triangulation displacement sensors. The 3D positioning and posture sensor allows access to the third dimension through depth measurement; the performance of the sensor varies according to the level of nonlinearities presented in the system, which leads to inaccuracies in measurement. Design/methodology/approach While applying optimization approach, the mathematical model and the relationship between the key parameters in the laser triangulation ranging and the indexes of the measuring system were analyzed. Findings Based on the performance of the parametric optimization method, the measurement repeatability reached 0.5 µm with an STD value within 0.17 µm, an expanded uncertainty of measurement was within 5 µm, the angle error variation of the object’s rotational plane was within 0.031 degrees and nonlinearity was recorded within 0.006 per cent in a full scale. The proposed approach reduced the effect of the nonlinearity presented in the sensor. Thus, the accuracy and speed of the sensor were greatly increased. The specifications of the optimized sensor meet the requirements for high-accuracy devices and allow wide range of industrial application. Originality/value In this paper, COA-based BPNN is proposed for laser triangulation displacement sensor optimization, on the basis of the mathematical model, clarifying the working space and working angle on the measurement system.

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.

EXPERIMENTAL STUDIES OF CAR PROPERTIES ON A PHYSICAL MODEL

2019 ◽  
pp. 10-16
Author(s):  
Oleksii Timkov ◽  
Dmytro Yashchenko ◽  
Volodymyr Bosenko
Keyword(s):  
Mathematical Model ◽  
Remote Control ◽  
Physical Model ◽  
Model Experiment ◽  
Experimental Studies ◽  
Electrical Energy ◽  
Short Term ◽  
Motor Current ◽  
Memory Card ◽  
The Mathematical Model

The article deals with the development of a physical model of a car equipped with measuring, recording and remote control equipment for experimental study of car properties. A detailed description of the design of the physical model and of the electronic modules used is given, links to application libraries and the code of the first part of the program for remote control of the model are given. Atmega microcontroller on the Arduino Uno platform was used to manage the model and register the parameters. When moving the car on the memory card saved such parameters as speed, voltage on the motor, current on the motor, the angle of the steered wheel, acceleration along three coordinate axes are recorded. Use of more powerful microcontrollers will allow to expand the list of the registered parameters of movement of the car. It is possible to measure the forces acting on the elements of the car and other parameters. In the future, it is planned to develop a mathematical model of motion of the car and check its adequacy in conducting experimental studies on maneuverability on the physical model. In addition, it is possible to conduct studies of stability and consumption of electrical energy. The physical model allows to quickly change geometric dimensions and mass parameters. In the study of highway trains, this approach will allow to investigate the various layout schemes of highway trains in the short term. It is possible to make two-axle road trains and saddle towed trains, three-way hitched trains of different layout. The results obtained will allow us to improve not only the mathematical model, but also the experimental physical model, and move on to further study the properties of hybrid road trains with an active trailer link. This approach allows to reduce material and time costs when researching the properties of cars and road trains. Keywords: car, physical model, experiment, road trains, sensor, remote control, maneuverability, stability.

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