scholarly journals Technological potentialities assessment of globoidal honing process

2019 ◽  
Vol 2019 (10) ◽  
pp. 38-41
Author(s):  
Владимир Спирин ◽  
Vladimir Spirin ◽  
Владимир Макаров ◽  
Vladimir Makarov ◽  
Олег Халтурин ◽  
...  
Keyword(s):  
Experimental Verification ◽  
Statistical Processing ◽  
Processing Conditions ◽  
Normal Length ◽  
Gear Honing ◽  
Measurement Results ◽  
Definition Of

A procedure for the assessment of technological potentialities of involute profile globoidal gear honing is offered. The assessment of process accuracy on measurement parameters chosen ans statistical processing of the measurement results on parameters: changes in a general normal length, a radial runout is carried out. An experimental verification on the definition of processing conditions impact upon roughness of gear surfaces processed is carried out.

Chronometric Height: a relativistic height definition by generalizing geopotential numbers

2021 ◽  
Author(s):  
Dennis Philipp
Keyword(s):  
Weak Field ◽  
Point Of View ◽  
Theoretical Point ◽  
Theoretical Formulation ◽  
Spacetime Geometry ◽  
Weak Field Limit ◽  
Measurement Results ◽  
Fundamental Insight ◽  
Definition Of ◽  
New Framework

<p>A height definition in terms of geopotential numbers offers a variety of advantages. Moreover, from the theoretical point of view, such a definition is considered more fundamental. </p><p>We know, however, that relativistic gravity (here General Relativity) requires to reformulate the basic geodetic notions and to develop a consistent theoretical framework, relativistic geodesy, to yield an undoubtedly correct interpretation of measurement results.</p><p>The new framework of chronometric geodesy that builds on the comparison of clocks offers fundamental insight into the spacetime geometry if a solid theoretical formulation of observables is underlying modern high-precision measurements. Here we approach a genuine relativistic definition of the concept of height. Based on the relativistic generalization of geopotential numbers, a definition of chronometric height is suggested, which reduces to the well-known notions in the weak-field limit.</p>

scholarly journals Experimental Verification of Pneumatic Cylinder External Pneumatic Cushioning

2019 ◽  
Vol 213 ◽  
pp. 02015
Author(s):  
Lukáš Dvořák ◽  
Lukáš Fuksa ◽  
Marian Ledvoň ◽  
Petr Brzezina
Keyword(s):  
Experimental Verification ◽  
Pneumatic Cylinder ◽  
Measurement Results ◽  
Introductory Part ◽  
Cylinder Piston

This paper deals with the possibilities of the pneumatic cylinder piston end-position cushioning. The introductory part describes the cushioning methods - elastic, hydraulic and internal pneumatic. The second part describes the external pneumatic cushioning, its experimental verification and the measurement results for a specific case.

Measurement of small values of hydrostatic pressure difference / Pomiar małych wartości różnicy ciśnień hydrostatycznych

2012 ◽  
Vol 57 (1) ◽  
pp. 157-167
Author(s):  
Krzysztof Broda ◽  
Wiktor Filipek
Keyword(s):  
Hydrostatic Pressure ◽  
Pressure Distribution ◽  
Atmospheric Pressure ◽  
Free Water ◽  
Reynolds Numbers ◽  
Measurement Results ◽  
Order Of Magnitude ◽  
Hydraulic Gradients ◽  
Accuracy Of Measurement ◽  
Definition Of

In order to describe the fluid flow through the porous centre, made of identical spheres, it is necessary to know the pressure, but in fact - the pressure distribution. For the flows in the range that was traditionally called laminar flow (i. e. for Reynolds numbers (Bear, 1988; Duckworth, 1983; Troskolański, 1957) from the range 0,01 to 3) it is virtually impossible with the use of the tools directly available on the market. Therefore, many scientists who explore this problem have concentrated only on the research of the velocity distribution of the medium that penetrates the intended centre (Bear, 1988) or pressure distribution at high hydraulic gradients (Trzaska & Broda, 1991, 2000; Trzaska et al., 2005). It may result from the inaccessibility to the measurement methods that provide measurement of very low hydrostatic pressures, such as pressure resulting from the weight of liquid located in the gravitational field (Duckworth, 1983; Troskolański, 1957). The pressure value c. 10 Pa (Troskolański, 1957) can be generated even by 1 mm height difference between the two levels of the free water surface, which in fact constitutes the definition of gauging tools of today measuring the level of the hydrostatic pressure. Authors proposed a method of hydrostatic pressure measurement and devised a gauging tool. Then a series of tests was conducted aiming at establishing what is the influence of various factors, such as temperature, atmospheric pressure, velocity of measurement completion, etc. on the accuracy and method of measurements. A method for considerable reduction of hysteresis that occurs during measurement was also devised. The method of measurement of small hydrostatic difference measurements allows for the accuracy of measurement of up to 0.5 Pa. Measurement results can be improved successfully by one order of magnitude, which for sure would entail necessary temperature stabilization of the tool. It will be more difficult though to compensate the influence of atmospheric pressure on the measurement process.

scholarly journals Моделювання залежностей «багатовимірний вхід–вихід» для автоматизації процесів керування в умовах невизначеності

2015 ◽  
pp. 86-90
Author(s):  
Л. І. Лєві
Keyword(s):  
Least Squares Method ◽  
Statistical Processing ◽  
Fuzzy Regression ◽  
Regression Equations ◽  
Continuous Output ◽  
Fuzzy Regression Model ◽  
Multivariate Dependence ◽  
Input Variables ◽  
Definition Of

Розглянута у роботі технологія дає змогу шляхомпоєднання переваг м’яких обчислень і реґресійного ана-лізу будувати багатофакторні залежності з неперерв-ним виходом, враховуючи як можливість визначенняступеня важливості вхідних змінних, так і їх взаємодійнеобхідного порядку. Проте під час моделюванняоб’єктів із неперервним виходом, коли необхідна до-статня точність визначення чіткого значення вихідноївеличини, знаходження параметрів нечіткого рівнянняреґресії за методом найменших квадратів та парамет-рів функцій належностей шляхом статистичної оброб-ки експертної інформації не може в повній мірі забез-печити потрібну точність. Для цього потрібно налаш-тувати за навчальною вибіркою нечітку реґресійну мо-дель у відповідності до тестуючої вибірки. In work considered technology allows to build multivariate dependence with continuous output by combining the advantages of soft computing and regression analysis, given the opportunity, the definition of importance of input variables and their necessary interactions. However, when modeling objects with continuous output when a sufficient accuracy of the determination of a precise value of the output value is necessary, the identification of the parameters of fuzzy regression equations using the least squares method and parameters of membership functions by statistical processing of expert information is not sufficient to provide the desired accuracy. It requires configuration on the training set of a fuzzy regression model in accordance with the testing sample.

scholarly journals COMPARATIVE ANALYSIS OF ANTHROPOMETRIC INDICATORS OF PHYSICAL DEVELOPMENT OF SCHOOLCHILDREN IN THE CITIES OF SAMARA AND PENZA

2016 ◽  
Vol 1 (1) ◽  
pp. 25-30
Author(s):  
II I Berezin ◽  
OV V Sazonova ◽  
MYu Yu Gavryushin
Keyword(s):  
Waist Circumference ◽  
Body Mass ◽  
Growth And Development ◽  
Age Groups ◽  
Statistical Processing ◽  
Educational Process ◽  
Healthy Children ◽  
Anthropometric Data ◽  
Anthropometric Characteristics ◽  
Definition Of

Aim - definition of modern features of growth and development of children from Samara and Penza. Material and methods. Anthropometric researches (length and body mass, circumference of the chest, waist and hips) of children from Samara and Penza at the age of 7-17 years were held. 2784 healthy and almost healthy children (I and II health groups) joined the survey group: 1397 children from Samara and 1387 children from Penza. The obtained data of the average values of anthropometric characteristics of children from Penza were compared with the results of the research of the corresponding sex and age groups of schoolchildren from Samara. The statistical processing of the obtained data was made with the help of the software package SPSS 21. Results. Children from Penza in primary and middle school levels have reliably higher values of the measures of the length and body mass in comparison with the parameters of their peers from Samara. Boys from Penza in all age groups (except 12 years old boys) and girls in middle (11-14 years) and senior (15-17 years) school levels have reliably higher values of the measures of chest circumference in comparison with the parameters of their peers from Samara. Waist circumference ofboys from Penza has reliably higher values in age groups of 7, 10, 11, 13-17 years. At the same time, significant differences in the values of waist circumference of girls from Penza and Samara were not revealed. Schoolchildren from Penza in the boys’ age groups of 7-11, 13 years and girls’ age groups of 7-14 years have reliably higher values of the measures of the circumference of hips in comparison with the corresponding groups of schoolchildren from Samara. Conclusion. Revealed significant differences of anthropometric data can serve as the evidence of inhomogeneous influence of such factors as living conditions and lifestyle, environment, and educational process on the growth and development of schoolchildren from Samara and Penza.

Implementation of an Approach for Characterisation of Radiological Inventory for Decommissioning at Chinon A2 NPP

2014 ◽  
Author(s):  
A. Traichel ◽  
F. Tardy ◽  
M. Mummert
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Statistical Processing ◽  
Analysis Data ◽  
Measured Data ◽  
Primary Circuit ◽  
Measurement Systems ◽  
Definition Of ◽  
Local Sampling

A general overview of the existing radioactive inventory in the plant is necessary for the decommissioning of nuclear power plants. Based on the knowledge about radiological inventory, appropriate decommissioning techniques and procedures can be specifically used. In order to derive the existing radiological activity in the facility a study was carried out to obtain a representative overview of the total radiological situation at the NPP. Within a study a generic methodology for the radiological characterization was developed. This methodology has been applied on the CO2-circuit of the gas-cooled, graphite-moderated reactor Chinon A2 (MAGNOX type). This paper covers the implementation of an approach for characterisation of radiological inventory for decommissioning. The approach aims at the definition of the number and distribution of local sampling, required measurements as well as suitable measurement systems leading to a confident result with minimized effort in sampling. The paper covers two main objectives: 1. Methodology at and 2. Determination of radiological inventory based on measured data. The proposed methodology is a stepwise procedure which offers the possibility for minimizing the number of required measurements/sample analyses. At the first step the underlying system is an “as-simple-as-possible”-example with homogeneous contamination. In a second step the methodology is expanded to a more realistic and complex system, for which additional investigations have to be performed. The determination of the radiological inventory using the methodology has to consider a given confidence level and maximum allowed error. Therefore statistical assessment is widely used in estimations. The result of this first part of study generates the basis for further investigation. This comprises application of methodology to the mentioned technical system. Therefore corresponding measurement and analysis data have to be delivered and proven regarding adequacy for the proposed methodology. From the dataset various measurement systematic and retained parameters could be derived. The accuracy of given measured data was checked by further examination. The result of the performed analysis leads to a statement about the activity in the primary circuit. The result of this study is an comprehensive estimation of the activity by defined statistical processing of analysed data. The result consists moreover of the analysis of the measurement plan and of distribution and deviation within the measured data. Suggestions for further measurement campaigns are provided based on the deviations and inconsistencies of the data. With the help of these suggestions it should be possible to decrease the number of samples and measuring data as well as improve the comparability of separate measurement processes. Particular potential for improvement of the result for inventory can be seen in a deeper analysis of uncertainties, this was realised and will be explained in the paper.

Discussion on the Classification Criteria of Measurement System Level

2021 ◽  
Author(s):  
Yi-Ting Chen ◽  
Keyword(s):  
Measurement System ◽  
Metrological Traceability ◽  
Classification Criteria ◽  
System Level ◽  
Traceability Chain ◽  
Measurement Systems ◽  
Primary Measurement ◽  
Measurement Results ◽  
Definition Of

According to the definition of metrological traceability in ISO/IEC Guide 99:2007(VIM 3)[1], people in the metrology field can know the level of the measurement system in the metrological traceability chain by drawing the metrological traceability diagram on the measurement results. However, if someone want to further determine which level the measurement system belongs to, it should be classified as primary measurement system, secondary measurement system, or even other measurement systems. Because the definitions of terms such as primary measurement system, secondary measurement system and other measurement systems are not included in VIM 3[1], there’s no clear classification basis for the measurement system level. Therefore, this article will discuss the definitions of terms in VIM 3[1] that are more relevant to the classification of measurement system levels, then try to formulate the classification criteria, supplemented by case studies, and hope to serve as a reference for people in the metrology field when reviewing the measurement system and judging its system level.

Sign in / Sign up

Export Citation Format

Share Document