MODELING OF MECHANICAL TRANSMISSION TAKING INTO ACCOUNT FREQUENCY OF TOOTH-ENGAGEMENT

2021 ◽  
pp. 41-46
Author(s):  
Ya. A. Darsht ◽  
A. B. Karpenko
Keyword(s):  
Control Systems ◽  
Reduction Gear ◽  
Mechanical Transmission ◽  
Geometric Errors ◽  
Output Link ◽  
Electromechanical Drive ◽  
Speed Fluctuations ◽  
Engine Rotor ◽  
Model Approach

At present time, in control systems, an electromechanical drive, which includes a reduction gear, is widely used. To ensure the quality of the output movement of the drive, it is not enough synthesize it according to the criteria of performance and accuracy. With increasing requirements for drives, the need arose for such an indicator of the quality of dynamics as smoothness [1], which is mainly influenced by the quality of the mechanical transmission production. The article provides an example of modeling a reduction gear taking into account multi-massage, the number of teeth, geometric errors of tooth-engagement, imbalance of the engine rotor. The spectrum of speed fluctuations of the output link is obtained, which characterizes the smoothness of the reduction gear operation. A conclusion is made about the prospect of using a model approach to diagnose the smooth operation of reduction gears.

scholarly journals A Fumonisin Prevention Tool for Targeting and Ranking Agroclimatic Conditions Favoring Exposure in French Maize-Growing Areas

Toxins ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 214
Author(s):  
Agathe Roucou ◽  
Christophe Bergez ◽  
Benoît Méléard ◽  
Béatrice Orlando
Keyword(s):  
Mixed Model ◽  
Linear Mixed Model ◽  
Fusarium Verticillioides ◽  
Agricultural Practices ◽  
Climatic Conditions ◽  
Agricultural Cooperatives ◽  
Mixed Model Approach ◽  
Food And Feed ◽  
Model Approach

The levels of fumonisins (FUMO)—mycotoxins produced by Fusarium verticillioides—in maize for food and feed are subject to European Union regulations. Compliance with the regulations requires the targeting of, among others, the agroclimatic factors influencing fungal contamination and FUMO production. Arvalis-Institut du végétal has created a national, multiyear database for maize, based on field survey data collected since 2003. This database contains information about agricultural practices, climatic conditions and FUMO concentrations at harvest for 738 maize fields distributed throughout French maize-growing regions. A linear mixed model approach highlights the presence of borers and the use of a late variety, high temperatures in July and October, and a water deficit during the maize cycle as creating conditions favoring maize contamination with Fusarium verticillioides. It is thus possible to target a combination of risk factors, consisting of this climatic sequence associated with agricultural practices of interest. The effects of the various possible agroclimatic combinations can be compared, grouped and classified as promoting very low to high FUMO concentrations, possibly exceeding the regulatory threshold. These findings should facilitate the creation of a national, informative and easy-to-use prevention tool for producers and agricultural cooperatives to manage the sanitary quality of their harvest.

The multi-model approach for fractional-order systems modelling

2016 ◽  
Vol 40 (1) ◽  
pp. 331-340 ◽  
Author(s):  
Samia Talmoudi ◽  
Moufida Lahmari
Keyword(s):  
Transfer Function ◽  
Fractional Order ◽  
Global Model ◽  
Fractional Order Systems ◽  
New Approach ◽  
Physical Systems ◽  
Integer Order ◽  
Systems Modelling ◽  
Model Approach

Currently, fractional-order systems are attracting the attention of many researchers because they present a better representation of many physical systems in several areas, compared with integer-order models. This article contains two main contributions. In the first one, we suggest a new approach to fractional-order systems modelling. This model is represented by an explicit transfer function based on the multi-model approach. In the second contribution, a new method of computation of the validity of library models, according to the frequency [Formula: see text], is exposed. Finally, a global model is obtained by fusion of library models weighted by their respective validities. Illustrative examples are presented to show the advantages and the quality of the proposed strategy.

scholarly journals THEORETICAL FUNDAMENTALS OF ESTIMATABILITY ASSESSMENT OF TRAIN SITUATION SIGNS FOR WORK OF INTELLECTUAL LOCOMOTIVE CONTROL SYSTEMS

2021 ◽  
Vol 1 (38) ◽  
pp. 223-231
Author(s):  
O. Gorobсhenko
Keyword(s):  
Control Systems ◽  
Random Search ◽  
Information Value ◽  
Train Control ◽  
Relative Value ◽  
Basic Parameters ◽  
Control Decision ◽  
Definition Of

The article is devoted to the problem of implementation of intelligent control systems in transport. An important task is to assess the information parameters of the control systems. In the existing works the question of definition of one of the basic parameters of functioning of locomotive control systems - information value of separate signs of a train situation is not considered. This does not make it possible to determine the order of signal processing at the input and assess their contribution to the adoption of a control decision. Moreover, informativeness is a relative value, which is expressed in the different information value of a particular feature for the classification of different train situations. Also, the informativeness of the feature may depend on the type of decisive rules in the classification procedure. The quality of recognition of a train situation in which the locomotive crew is, depends on the quality of the features used by the classification system. The decisive criterion for the informativeness of the features in the problem of pattern recognition is the magnitude of losses from errors. To determine the range of the most informative features of train situations, the method of random search with adaptation was used. The results of the work make it possible to optimize the operation of automated and intelligent train control systems by reducing the amount of calculations and simplifying their algorithm.

scholarly journals Pengaruh Kompetensi Sumber Daya Manusia, Sistem Pengendalian Intern, dan Pemanfaatan Teknologi Informasi terhadap Kualitas Laporan Keuangan (Studi pada Badan Pusat Statistik Wilayah Maluku)

2019 ◽  
Vol 5 (2) ◽  
pp. 75
Author(s):  
Jefry Jef Gasperz
Keyword(s):  
Information Technology ◽  
Control Systems ◽  
Internal Control ◽  
Financial Statements ◽  
Development Planning ◽  
Central Bureau ◽  
Primary Data ◽  
Financial Reports ◽  
Internal Control System

This study aims to examine the effect of human resource competence, government internal control system and the use of information technology on the quality of financial statements of Central Bureau of Statistics in the Maluku Region.The population in this study are employees who handle accounting / financial reports on all accounting entities within the Central Bureau of Statistics in the Maluku Region.The research sample is the financial statements stylist includes PPK , PPSPM, financial staff, equipment, program development (planning) or administration as well as employees in the technical field who make financial reports. The data analyzed are primary data obtained through questionnaires. Total questionnaires distributed amounted to 57 and processed as many as 50 questionnaires (87.72%). The analytical method used is the multiple regression analysis method.Hypothesis testing results indicate that the competence of human resources and government internal control systems has a positive and significant effect on the quality of financial statements while the use of information technology has no effect on the quality of financial statements. 

scholarly journals Quality of learners at the start of each educational process

2019 ◽  
Vol 9 (14) ◽  
Author(s):  
Abdennasser Naji
Keyword(s):  
Control Systems ◽  
Preventive Measures ◽  
Educational Process ◽  
Service Needs ◽  
True Value ◽  
Previous Cycle ◽  
Set Up ◽  
The One

The education system is organized in the form of cycles, each feeding the one following it with learners. They will continue their studies in the destination cycle, and their future will certainly depend, at least in part, on the quality of the skills acquired in the previous cycle. Given the divergences and disparities existing between the different cycles mainly due to the fact that each responds to its own design logic and in the absence of coordination between them, there is a huge lack of quality to gain at the interface of the cycles . The referral system that plays the role of supply service needs to be updated to strengthen educational quality, but it is not the only one. It is also necessary to help the orienting staff to assess the quality of the learners at its true value, to set up partnership links between the cycles to help each other in favor of quality, and to set up reception control systems at the entry of each cycle, supported by corrective and preventive measures.

scholarly journals Fatty Acids and Oxylipins as Antifungal and Anti-Mycotoxin Agents in Food: A Review

Toxins ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 852
Author(s):  
Mei Qiu ◽  
Yaling Wang ◽  
Lijun Sun ◽  
Qi Deng ◽  
Jian Zhao
Keyword(s):  
Fatty Acids ◽  
Control Systems ◽  
Molecular Mechanisms ◽  
Antifungal Agents ◽  
Recent Literature ◽  
Fungal Growth ◽  
Food Control ◽  
Fungal Contamination ◽  
Mycotoxigenic Fungi

Fungal contamination of food, especially by mycotoxigenic fungi, not only reduces the quality of the food, but can also cause serious diseases, thus posing a major food safety challenge to humans. Apart from sound food control systems, there is also a continual need to explore antifungal agents that can inhibit fungal growth and mycotoxin production in food. Many types of fatty acids (FAs) and their oxidized derivatives, oxylipins, have been found to exhibit such effects. In this review, we provide an update on the most recent literature on the occurrence and formation of FAs and oxylipins in food, their effects on fungal growth and mycotoxin synthesis, as well as the genetic and molecular mechanisms of actions. Research gaps in the field and needs for further studies in order to realizing the potential of FAs and oxylipins as natural antifungal preservatives in food are also discussed.

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