scholarly journals Analysis of Dynamic Parameters of the System of Raster Formation and Control

2020 ◽  
Vol 22 (3) ◽  
pp. 78-88
Author(s):  
Antanas Fursenko ◽  
Arturas Kilikevicius ◽  
Kristina Kilikeviciene ◽  
Jonas Skeivalas ◽  
Albinas Kasparaitis ◽  
...  
Keyword(s):  
Time Scale ◽  
Measuring Equipment ◽  
Research Work ◽  
Measurement Data ◽  
Covariance Functions ◽  
Sensing System ◽  
Position Detection ◽  
Optical Measuring ◽  
And Control ◽  
Auto Covariance

The presented research work analyzes the sensing system, the main aim of which is a raster formation and controlling this process using the optical measuring equipment and high precision angle encoders. Optical measuring equipment are used for the raster position detection, meanwhile angle encoders for controlling the tape speed. The main parameter of raster formation process is fixed transportation speed, but there are difficulties to realize it, because there is imperfection of the device elements. The article analyzes the dispersion of vibration accelerations of the raster formation device and tape in the two directions (transverse and longitudinal) and presents an analysis of their parameters in application of the theory of covariance functions. The results of the measurements of vibration accelerations at the fixed points of the device constructions and the tape were recorded on a time scale in the form of digital arrays (matrices). Values of auto-covariance and inter-covariance functions of digital arrays of the vibration accelerations measurement data were calculated by changing the quantum interval in a time scale. The developed software Matlab 7 in operator package environment was used in the calculations.

scholarly journals Theoretical and experimental analysis of dynamic parameters of the leveling and centering device

2019 ◽  
Vol 52 (3-4) ◽  
pp. 222-228
Author(s):  
Arturas Kilikevicius ◽  
Jonas Skeivalas ◽  
Mindaugas Jurevicius ◽  
Kristina Kilikeviciene ◽  
Vytautas Turla ◽  
...  
Keyword(s):  
Time Scale ◽  
Measurement Techniques ◽  
Measurement Data ◽  
Covariance Functions ◽  
Cross Covariance ◽  
Measurement Results ◽  
Dynamical Parameters ◽  
Oscillation Strength ◽  
Special Computer Program ◽  
Auto Covariance

The article analyzes vibrational oscillation’s strength dissemination and the parameters in the centering and leveling table using the covariance function theory. The implementation of measurement techniques requires to use most advanced ideas, and to seek and develop new tools, based on which the direction of angle calibration system’s development could be substantiated and calibration methodologies could be enabled. Vibrational oscillation strength measurements across fixed five ring points’ observations were recorded on a time scale in five vectors arrays (matrices). The covariance functions have enabled the evaluation of the influence of the vibrations of the corresponding rings on the accuracy of the measurement results. Expressions of auto-covariance and cross-covariance functions show the changes in the time scale of the interdependence between the parameters of the corresponding vibrations of the rings on the smoothing device. These changes significantly affect the measurement data errors. The digital vibrational strength measurement arrays’ reciprocal covariance functions were calculated, and estimates of individual arrays’ auto-covariance functions, by changing the quantization interval on the time scale. The covariance model proposed by the authors for the analysis of the dynamical parameters of the centering–leveling devices can be used to investigate the dynamic characteristics of the angular comparators containing the said devices and at the same time to determine the ways of improving the precision of these angular comparators. The calculations were carried out using the special computer program developed by the authors of the Matlab7 Operator Package (The MathWorks, Inc. R2012a 7.14.0.739 License Number 699298).

scholarly journals Analysis of Air Pollution Parameters Using Covariance Function Theory

2020 ◽  
Vol 27 (4) ◽  
pp. 555-565
Author(s):  
Ignas Daugela ◽  
Jurate Suziedelyte Visockiene ◽  
Jonas Skeivalas
Keyword(s):  
Environmental Pollution ◽  
Time Scale ◽  
Covariance Function ◽  
Function Theory ◽  
Trace Gas ◽  
Covariance Functions ◽  
Intensity Changes ◽  
Oxygen Gas ◽  
Auto Covariance ◽  
Sentinel 2

Abstract The paper analyses the intensity changes of three pollution parameter vectors in space and time. The RGB raster pollution data of the Lithuanian territory used for the research were prepared according to the digital images of the Sentinel-2 Earth satellites. The numerical vectors of environmental pollution parameters CH4 (methane), NO2 (nitrogen dioxide) and for direct comparison O2 (oxygen gas) were used for the calculations. The covariance function theory was used to perform the analysis of intensity changes in digital vectors. Estimates of the covariance functions of the numerical vectors of pollution parameters and O2 or the auto-covariance functions of single vectors are calculated from random functions consisting of arrays of measurement parameters of all parameters vectors. Correlation between parameters vectors depends on the density of parameters and their structure. Estimates of covariance functions were calculated by changing the quantization interval on a time scale and using a compiled computer program using the Matlab procedure package. The probability dependence between the environmental pollution parameter vectors and trace gas of the territory in Lithuania and their change in time scale was determined.

scholarly journals Analysis of Dynamic Parameters of a Linear Positioning Table System

Mechanika ◽  
2020 ◽  
Vol 26 (5) ◽  
pp. 426-434
Author(s):  
Vytautas TURLA ◽  
Artūras KILIKEVICIUS ◽  
Mindaugas JUREVICIUS ◽  
Antanas FURSENKO ◽  
Kristina KILIKEVICIENE ◽  
...  
Keyword(s):  
Fixed Points ◽  
Time Scale ◽  
Dynamic Parameters ◽  
Vibration Intensity ◽  
Covariance Functions ◽  
Cross Covariance ◽  
Auto Covariance

In the paper, the spread of intensity of linear positioning table system vibrations is examined and an analysis of their parameters upon applying the theory of covariance functions is carried out. For the investigation, two linear positioning tables were chosen; for them, different lubricants were used: universal lubricant Loctite 8103 and lubricant Braycote 601EF for working in vacuum. The results of measurements of the vibration intensity in four fixed points upon varying the speed of the carriage were recorded on the time scale in form of arrays (matrices). The estimates of cross-covariance functions of the arrays of results of measurements of the digital vibration intensity were calculated. The estimates of auto-covariance functions of single arrays upon changing the quantization interval on the time scale were calculated too. For the calculations, the software developed upon using Matlab7 package of procedures was applied.

scholarly journals Analysis of Dynamic Parameters of a Railway Bridge

2019 ◽  
Vol 9 (12) ◽  
pp. 2545 ◽  
Author(s):  
Artūras Kilikevičius ◽  
Jonas Skeivalas ◽  
Kristina Kilikevičienė ◽  
Jonas Matijošius
Keyword(s):  
Fixed Points ◽  
Time Scale ◽  
Modal Parameters ◽  
Dynamic Parameters ◽  
Railway Bridge ◽  
Covariance Functions ◽  
The Individual ◽  
The Impact ◽  
Auto Covariance

This article analyses the dispersion of vibration accelerations of a railway bridge during the passage of a train, and presents an analysis of their parameters after the application of the theory of covariance functions. The measurements of vibration accelerations at the fixed points of the beams of the overlay of the bridge were recorded in the time scale as digital arrays (matrices). The values of inter-covariance functions of the arrays of data of measurements of digital vibration accelerations and the values of auto-covariance functions of the individual arrays, changing the quantization interval in the time scale, were calculated. The compiled software Matlab 7 in the operator package environment was used in calculations. This article aims at determining the interdependencies of results of vibrations of bridge points rather than at the impact which a train makes on a bridge without emphasizing the modal parameters of the bridge. The aforementioned interdependencies make it possible to predict the results of hard-to-reach points.

Vibration measurements of paper prints and the data analysis

2020 ◽  
Vol 35 (1) ◽  
pp. 115-123
Author(s):  
Arturas Kilikevicius ◽  
Mindaugas Jurevicius ◽  
Robertas Urbanavicius ◽  
Vytautas Turla ◽  
Kristina Kilikeviciene ◽  
...  
Keyword(s):  
Time Scale ◽  
Practical Problem ◽  
Mechanical Parameters ◽  
Paper Sheet ◽  
Correct Position ◽  
Vibration Signals ◽  
Covariance Functions ◽  
Cross Covariance ◽  
Auto Covariance ◽  
Printing Machine

AbstractThis paper discusses about the scatter of the intensity of vibration signals of paper prints and analyses their mechanical parameters applying the theory of covariance functions. It is an important practical problem, before starting printing process of colour prints, expecting the correct position of fixed raster points, to adjust the paper sheet tension between printing machine sections. The results of measuring the intensity of vibration signals at the fixed points were presented on a time scale in the form of arrays (matrices). The estimates of cross-covariance functions between digital arrays result in measuring the intensity of vibrations, and the estimates of auto-covariance functions of single arrays were calculated upon changing the quantization interval on the time scale. Application of normed auto-covariance and cross-covariance functions enables reduction of preprinting experimental measurements, which saves time (what is actual for industry). Tension force depends on the mechanical properties of the paper sheet and print. These characteristics depend on paper type, layers of printing colors and positioning of the coverage. In the calculation, the software Matlab 7 in batch statement environment was applied.

The effect of practicing yoga during pregnancy on labor stages length, anxiety and pain: a randomized controlled trial

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ellahe Mohyadin ◽  
Zohreh Ghorashi ◽  
Zahra Molamomanaei
Keyword(s):  
Controlled Trial ◽  
Intervention Group ◽  
Total Duration ◽  
Measurement Data ◽  
Labor Pain ◽  
Control Group ◽  
Chi Square ◽  
Nulliparous Women ◽  
Two Stages ◽  
And Control

AbstractBackgroundAnxiety and fear of labor pain has led to elevated cesarean section rate in some countries. This study was conducted to investigate the effect of yoga in pregnancy on anxiety, labor pain and length of labor stages.MethodsThis clinical trial study was performed on 84 nulliparous women who were at least 18 years old and were randomly divided into two groups of yoga and control groups. Pregnancy Yoga Program consisting of 6 60-min training sessions was started every 2 weeks from week 26 of pregnancy and continued until 37 weeks of gestation. Anxiety severity at maternal admission to labor was measured by the Spielbergers State-Trait Anxiety Inventory, and labor pain was measured by Visual Analogue Scale (VAS) at dilatation (4–5 cm) and 2 h after the first measurement. Data were analyzed using Chi-Square and t-test.ResultsIntervention group reported less pain at dilatation (4–5 cm) (p=0.001) and 2 h after the first measurement (p=0.001) than the control group. Stat anxiety was also lower in intervention group than the control group (p=0.003) at the entrance to labor room. Subjects in the control group required more induction compared to intervention group (p=0.003). Women in intervention group experienced shorter duration of the first phase of the labor than the control group (p=0.002). Also, the total duration of two stages of labor was shorter in intervention group than the control group (p=0.003).ConclusionsPracticing yoga during pregnancy may reduce women’s anxiety during labor; shorten labor stages, and lower labor pain.

Research on the Pose Detection and Control Methods of Robot with Series-Parallel Structure

2013 ◽  
Vol 303-306 ◽  
pp. 1685-1690 ◽  
Author(s):  
Dong Yang ◽  
Tie Jun Li ◽  
Jin Yue Liu ◽  
Hai Wen Zhao
Keyword(s):  
Structural Features ◽  
Hybrid Structure ◽  
Parallel Structure ◽  
Sensing Systems ◽  
Position Detection ◽  
Pose Detection ◽  
Building Environment ◽  
Automated Installation ◽  
And Control ◽  
Structured Light Vision

Aiming at the load requirements, positioning accuracy and workflow of building panels installed robot, developed a 6 DOF of a series-parallel hybrid structure installed robot. According to the structural features of parallel mechanism to the installation manipulator, designed a robot attitude sensing system based on the inclination and laser ranging sensor information feedback; according to the characteristics of the building environment, proposed the position detection method of panels to be installed based on the structured light vision; constructed the control system of the installation manipulator, and used teaching mode to achieve robot control and system calibration. The experimental data prove that, the control and sensing systems of panels installed robot, overcome the complexity of the building environment and the diversity of installation object, and can achieve the automated installation of building panels.

A Design of Coal Mine Security Monitoring Substation Based on ZIGBEE and CAN Bus

2014 ◽  
Vol 971-973 ◽  
pp. 1033-1036
Author(s):  
Hui Jun Wang ◽  
Zhi Qun Yong
Keyword(s):  
Coal Mine ◽  
Can Bus ◽  
Measurement Data ◽  
Environmental Parameters ◽  
Monitoring And Control ◽  
Monitoring And Control System ◽  
Security Monitoring ◽  
Mine Development ◽  
Security Monitoring System ◽  
And Control

In view of the shortcoming such as wiring difficulties, poor scalability, and big cable usage in present mine security monitoring system, this paper puts forward a kind of substation monitoring and control system based on ZIGBEE and CAN. With the core of core, The system collects various measurement data of sensors through the ZIGBEE wireless network, realizes the to collect, and then through the CAN bus to realize the transmission of control commands and data of the up and down machine, and monitor the production parameters and environmental parameters in the coal mine. Experiments show that the monitoring substation is of high real-time performance, good stability, strong expansibility, etc., and can meet the requirements of the coal mine development and mining.

An Efficient Method for Motor Protection System Control Using Labview

2014 ◽  
Vol 4 (1) ◽  
pp. 43-50
Author(s):  
Abhay Kumar Singh ◽  
Shabbiruddin
Keyword(s):  
Fault Detection ◽  
Efficient Method ◽  
Motor System ◽  
Research Work ◽  
Protection System ◽  
System Control ◽  
Large Motor ◽  
And Control ◽  
Motor Protection ◽  
Financial Losses

The need for a motor protection system can be well understood by the fact that motors are integral device in any of the present day industries. Malfunctioning or any other faults in motor can halt the functioning of such industries. This can cause huge financial losses. So an efficient motor protection system is necessary. The present research work deals with the application of Labview for motor protection system, which can constantly monitor and control, a large motor system. This paper presents a highly reliable approach towards protection of commonly used motors. Here we deal with different kinds of motor faults and detection of all these faults using NI LABVIEW™. The present paper will not only be helpful for industrial purposes but it can also be helpful for students to understand motor fault detection. The LABVIEW has been successfully applied to make an efficient motor protection system.

scholarly journals Digital Governance of Moroccan School Establishments

2021 ◽  
pp. 348-355
Author(s):  
Abderrazak Mazouak ◽  
Malika Tridane ◽  
Said Belaaouad
Keyword(s):  
Research Work ◽  
Project Planning ◽  
Pedagogical Practices ◽  
Third Phase ◽  
First Results ◽  
On Line ◽  
The One ◽  
Traditional Paradigm ◽  
And Control ◽  
Relationship Of

Digital technologies have come to shake up the traditional paradigm of learning, and to change the existing relationship of "know-teaching" to put in place a key concept of the time is "to accompany through digital tools Our intervention is part of a technical-pedagogical approach and will focus on an action research work in which we will try:First, to present on line an accessible digital device that facilitates and organizes project planning and provides means to govern and control the quality of administrative acts.Next, We will show the first results of the experimentation of this tool in our context of research represented by 355 directors of the secondary schools of the provincial delegation of Taza. Morocco, pointing out all the constraints and limitations that hampered its implementation.Finally, we confirm that the use of this device by our sampling has caused a triple effect on their pedagogical practices: the professionalization of strategic planning on the one hand, and the governance of resources and the rationalization of pedagogical decisions on the other hand and immediate evaluation and regulation in the third phase.

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