Development of a generalized mathematical model of static error electromechanical measuring equipment

To keep military equipment fit for use, carry out maintenance activities, an important and integral part of which is metrological service. The effectiveness of metrological services depends on the completeness of the coverage of the monitored parameters, frequency and reliability of their measuring control. The most common, at present, when controlling the parameters of military equipment are electromechanical measuring equipment. The main metrological characteristic of electromechanical measuring instruments in a static measurement mode is the nominal calibration characteristic. During operation, the calibration characteristic of electromechanical measuring instruments, under the influence of various factors, has deviations from the nominal, which leads to an instrumental static error. The article deals with the applied aspects of assessing the static error of electromechanical measuring equipment, which is expressed through the sensitivity or static transmission coefficients of measuring transducers. Based on the results of the analysis, a generalized mathematical model of the relative static error of electromechanical measuring equipment for various structural schemes of connecting measuring transducers was obtained. It is proposed to apply a generalized mathematical model to assess the relative static error of electromechanical measuring instruments (with various structural schemes) during their operation. The use of an updated static error will allow to refine the calibration characteristics of electromechanical measuring instruments, which in turn will lead to obtaining reliable information about the state of military equipment during metrological maintenance and immediately before use.

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Step-by-step control of target efficiency indices of the control and measuring equipment stock applied in construction and housing and communal services

MATEC Web of Conferences ◽

10.1051/matecconf/201817001010 ◽

2018 ◽

Vol 170 ◽

pp. 01010 ◽

Cited By ~ 2

Author(s):

Rustam Khayrullin ◽

Pavel Ivanov

Keyword(s):

Mathematical Model ◽

Finite Difference ◽

Measuring Equipment ◽

Technical Condition ◽

Measuring Instruments ◽

Finite Difference Equations ◽

Target Values ◽

The Mathematical Model ◽

Step Control ◽

Different Levels

The mathematical model is considered for the formation and implementation of development strategies of the stock of control and measuring instruments (CMI) applied in construction and housing and communal services(HCS), and step-by-step control of efficiency target values of the stock. The model is based on a system of finite - difference equations describing the change of number of the CMI samples with different levels of technical perfection and technical condition at each planning interval. The model allows calculating the required number of CMI for procurement and repairs in the various groups for provide target values of efficiency indices at each planning interval. Controller is number of modern CMI samples for procurement and number of modern and obsolete faulty CMI samples for the repairs. The results of calculations are presented.

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DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

Avtoshliakhovyk Ukrayiny ◽

10.33868/0365-8392-2020-1-261-19-26 ◽

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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FEATURES OF APPLICATION OF SMALL RECONNAISSANCE ROBOT

Collection of scientific works of Odesa Military Academy ◽

10.37129/2313-7509.2019.11.29-38 ◽

2019 ◽

pp. 29-38 ◽

Cited By ~ 1

Author(s):

R. Zinko ◽

P. Kazan ◽

D. Khaustov ◽

O. Bilyk

Keyword(s):

Mathematical Model ◽

Armed Forces ◽

Climatic Conditions ◽

Design Stage ◽

Experimental Sample ◽

Single Trial ◽

Test Cycle ◽

Military Equipment ◽

The Mathematical Model ◽

Human Losses

A small intelligence robot (SSR) is a special military intelligence means. It is used to obtain information about the enemy - the collection of intelligence, the search for targets and target indication, observation of the situation, etc. The use of a small intelligence robot is assumed in various natural and climatic conditions: in temperate terrain, on soils with low bearing capacity, at low temperatures, in the desert, on sandy and marshy soils, on rocky soils, in elevated temperature and dustiness of air, and also in conditions highlands In the article an overview of modern developments of remotely controlled robotic military complexes, principles of their construction and perspective directions of development in the armed forces are reviewed. The issues of robotization of existing weapons and military equipment are considered. Every sample of a SSR used in combat action must possess all combat characteristics at once in an optimal ratio between them, ensuring its maximum effectiveness. Ignoring any of the properties or enhancing one property at the expense of others will not enable the full realization of the small surveillance robot. It is reasonable to select the relevant properties at the design stage, using the possibilities of mathematical modeling. The set of tactical and technical characteristics of the SSR allowed forming this. Its characteristics determine the scope and possibilities of application. The mathematical model of the SSR motion is written in the Matlab Simulink environment. Recorded mathematical model of SSR motion, formed single test cycle and input data allowed to conduct computer simulation of motion in possible conditions of operation of small surveillance robot.The single trial cycle presented contains a set of individual sites and reproduces the testing test cycle of a real polygon. On the basis of the developed tactical and technical characteristics of the SSR, the experimental sample was made. An example of the use of SSR for the intelligence of the settlement and at keeping the node of barriers has been provided. The efficiency of performing intelligence units’ tasks and reducing the risk of human losses are shown.

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The envelope method in the problem of choosing a rational composition of measuring instruments

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2021-2-68-72 ◽

2021 ◽

pp. 68-72

Author(s):

Il'ya A. Meshchikhin ◽

Sergej S. Gavryushin

Keyword(s):

Mathematical Model ◽

Monitoring Systems ◽

Measuring Instruments ◽

Key Points ◽

Envelope Method ◽

Loaded State ◽

The Mathematical Model ◽

Selection Of ◽

Rational Composition

As part of the development of monitoring systems for the operation of technical objects, the problem of improving the quality of monitoring systems for the loaded state is considered. Based on the analysis of the mathematical model of the structure and its loading, a methodology for the selection of measuring instruments was developed. The urgency of the problem of calculating substantiation of the choice of key points of the structure is shown, at which it is possible to measure deformations for the subsequent restoration of the existing loads with maximum accuracy. An approach based on the envelope method for determining the rational composition of measuring instruments for restoring the loads acting on the structure is stated.

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COMPARATIVE STUDY OF DIFFERENT MODELS FOR CALCULATION OF DNI

Revista de Engenharia Térmica ◽

10.5380/reterm.v17i2.64127 ◽

2018 ◽

Vol 17 (2) ◽

pp. 28

Author(s):

G. S. Lima ◽

A. O. Souza ◽

G. I. Medina T.

Keyword(s):

Experimental Data ◽

Mathematical Model ◽

Comparative Study ◽

Mathematical Models ◽

Environmental Variables ◽

Solar Power ◽

Measuring Instruments ◽

Concentrating Solar Power ◽

Direct Normal Irradiance

For prospecting or design of Concentrating Solar Power (CSP) systems it is necessary to know the distribution of the Direct Normal Irradiance (DNI) of the region. However, due to the recurring operational problems of measuring instruments, the use of mathematical models estimating the local DNI can be a very useful tool. The objective of this work is to construct a mathematical model that is used in the calculation of the DNI using experimental data provided by the Laboratory of Tropical Environmental Variables (LAVAT/INPE). This model was compared with other mathematical models already present in the literature. The consideration of clean-sky was used, that is, the effects of cloudiness, among others, were neglected.

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Metrological Activity At the Enterprise

Metrology and instruments ◽

10.33955/2307-2180(2)2020.40-43 ◽

2020 ◽

pp. 40-43 ◽

Cited By ~ 1

Author(s):

O. M. Dziabenko

Keyword(s):

Quality Management ◽

Measuring Equipment ◽

International Standards ◽

Management Systems ◽

Measuring Instruments ◽

Quality Management Systems ◽

Uniformity Of Measurements ◽

Calibration And Verification ◽

Monitoring And Measurement ◽

Metrological Requirements

When organizing metrological activity at an enterprise, the question arises of the need to organize verification (metrological confirmation) of measuring equipment that is not used in the field of legislatively regulated. In the international standards «Quality Management Systems» (ISO 9001, EN 9100, AQAP-2110), to ensure that the requirements of Section 7.1.5 «Resources for Monitoring and Measurement» are met, the requirement is established that all measuring equipment, as part of a measurement management system, must have metrological confirmation in accordance with the requirements of ISO 10012. Metrological confirmation provides for the calibration and verification of measuring equipment. Laboratory specialists who carry out metrological confirmation of measuring instruments, establish a relationship between the values of the values that provide the standards, and the result of measuring this quantity using measuring instruments (carry out calibration), based on this ratio establish the conformity / non-compliance of the measuring instruments with the established requirements (carry out verification) and draw up the corresponding supporting document. After comparing the concepts of metrological confirmation and verification of measuring instruments, we can conclude that metrological confirmation (calibration and verification) of measuring equipment is essentially nothing more than verification of measuring instruments. Metrological activities to ensure the uniformity of measurements in enterprises should comply with the requirements of ISO 10012: 2003. This standard establishes general requirements and contains recommendations for the management of measurement processes and metrological confirmation of the suitability of measuring equipment, which is used to maintain and demonstrate compliance with metrological requirements. Compliance with the requirements set forth in the ISO 10012 standard makes it possible to ensure compliance with the measurement requirements and the management of measurement processes established by the international standards «Quality Management Systems».

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Development of a Mathematical Model to Forecast Solar Radiation and Validating Results Using Machine Learning Technique

10.21203/rs.3.rs-669429/v1 ◽

2021 ◽

Author(s):

H.M.K.K.M.B. Herath ◽

S.V.A.S.H. Ariyathunge ◽

G.M.K.B. Karunasena

Keyword(s):

Neural Network ◽

Mathematical Model ◽

Linear Regression ◽

Solar Radiation ◽

Multiple Linear Regression ◽

Rural Areas ◽

Meteorological Data ◽

Measuring Instruments ◽

Linear Regression Method ◽

The Mathematical Model

Abstract Solar radiation or also referred to as solar power is the general expression for electromagnetic radiation emitted by the Sun. Direct solar radiation is an important factor in global solar radiation and is very influential in the efficiency evaluation of various applications for solar energy. For countries like Sri Lanka, installing a solar radiation instrument in rural areas is a challenge. Thus, both scientific and economically, measuring solar radiation without installing measuring instruments is an advantage. The aim of this study is to development of a mathematical model to predict solar radiation where solar radiation measurement instruments are not installed. The Artificial Neural Network (ANN) was used to verify the predictions of the mathematical model. Multiple Linear Regression (MLR) analysis was used for the development of a mathematical model to predict solar radiation. The model with the highest R2 value (0.5973) was chosen from the 127 equations as the best model that describes the solar radiation that reaches the surface of the earth. The dataset used for this study was meteorological data from the four month HI-SEAS weather station and are composed of ten attributes including date, time, radiation (H), temperature (Tair), pressure (P), humidity (φ), sunrise time, sunset time, wind direction (D), and speed (S). The angle of declination (δ) and sunshine hours (N) were calculated using the dataset. For the training of the neural network, 80 % of the data from the HI-SEAS dataset was used. The remaining data were used for testing both mathematical and ANN models. Results obtained from the multiple linear regression method and the ANN method was compared with the measured values. The experimental results suggested that the mathematical model was predicted the solar radiation with ±100 Wm-2 tolerance for both measured and ANN values.

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