Automatic Vessel Control in Stormy Conditions

2021 ◽  
pp. 68-71
Author(s):  
Vadym Mateichyk
Keyword(s):  
Automatic Control ◽  
Working Conditions ◽  
Closed Loop ◽  
Human Factor ◽  
Practical Experience ◽  
Automatic Calculation ◽  
Imitation Modeling ◽  
Efficiency And Effectiveness ◽  
Made In

Vessel control in a storm is the most difficult stage in the vessel voyage, as it requires quick decisions to be made in difficult conditions. Practical experience shows that the deterioration of the working conditions of the crew is usually associated with increase in the number of control mistakes [1]. The article examines the possibility of automatic control of a vessel in a stormy conditions by automatic calculation in the on-board controller of the vessel optimal safe speed and course during a storm. This allowed to significantly increase the accuracy of calculations, to exclude the human factor, to reduce the depletion of the crew, to increase the reliability of the vessel control in a storm. The efficiency and effectiveness of the method, algorithmic and software were tested on Imitation Modeling Stand in a closed loop with mathematical vessel models of the navigation simulator Navi Trainer 5000.

scholarly journals МЕТАЛОГІДРИДНИЙ АКУМУЛЯТОР-КОМПРЕСОР ВОДНЮ З АВТОМАТИЧНОЮ СИСТЕМОЮ УПРАВЛІННЯ ТА КОНТРОЛЮ

2020 ◽  
pp. 53-60
Author(s):  
Михайло Романович Ткач ◽  
Борис Георгійович Тимошевський ◽  
Аркадій Юрійович Проскурін ◽  
Юрій Миколайович Галинкін
Keyword(s):  
Automatic Control ◽  
Metal Hydride ◽  
Block Diagram ◽  
Automatic Monitoring ◽  
Outer Side ◽  
Piping System ◽  
Air Cooling ◽  
Monitoring And Control ◽  
Compression Pressure ◽  
Made In

A project of metal hydride hydrogen compressor is presented, which can be used as an element of refueling complexes, hydrogen storage and compression systems. The capacity of the developed sample is 40 kg of hydrogen, the mass is 4,8 ton, and the maximum compression pressure is 15 MPa. The base metal hydride material on the basis of which this compressor battery model is developed is LaNi4.5Al0.5. the sorption capacity of hydrogen of which is determined experimentally, and is at least 1.38 % by weight. A feature of the developed compressor battery is the use of air cooling, the presence of an automatic monitoring and control system, I allow a number of operations to be performed in automatic mode, and the use of software, electrical and automatic protection against overpressure. Each accumulator-compressor is made in the form of a steel box in which six blocks (capsules) are placed. The block, respectively, is made in the form of a steel coaxial multilayer cylinder, on the outer side of which there is a heating element and a layer of thermal insulation. In the middle of the cylinder is a sealed capsule filled with metal hydride material. Capsules are interconnected with the collector through a piping system. Also, the piping system is equipped with an inlet valve connecting the volume formed with an external receiver. The battery-compressor is equipped with an external receiver, to which a hydrogen, vacuum, nutrient and consumable outline is connected. Each circuit is equipped with an electromagnetic valve, as well as measuring devices, which makes it possible to carry out automatic control of parameters and automatic control of the device in accordance with the operating mode. A list of equipment is presented, on the basis of which a system of automatic control and monitoring, a block diagram of the main operating modes, an interface of the developed software are developed. Depending on the mode chosen by the operator, the automatic control and monitoring system allows activation of metal hydride materials, purification of contaminants of harmful impurities, sorption and desorption of hydrogen.

scholarly journals Human Factor in Smart Industry: A Literature Review

2020 ◽  
Vol 12 (1) ◽  
pp. 87-111 ◽  
Author(s):  
Vander Luiz Silva ◽  
João Luiz Kovaleski ◽  
Regina Negri Pagani ◽  
Alana Corsi ◽  
Myller Augusto Santos Gomes
Keyword(s):  
Literature Review ◽  
Working Conditions ◽  
Industry 4.0 ◽  
Human Performance ◽  
Human Factor ◽  
Physical And Mental Health ◽  
Professional Career ◽  
Smart Industry ◽  
Constant Improvement ◽  
Selection Of

Purpose of the study: The objective of this study is to identify the benefits and challenges of smart industry concept to the human factor, based on the concept of Industry 4.0.Methodology/approach: A systematic literature review was elaborated, based on structured protocols for the selection of a bibliographic portfolio of articles. A bibliometric analysis of the data and content analysis was performed.Originality/relevance: The article discusses human work, focusing on theoretical and practical contributions of international literature. The focus scenario is smart industry, a concept in constant improvement, which currently has acquired influences from Industry 4.0.Main results: The discussions lead us to ponder on human factor in smart industries in the categories physical and mental health at work, human performance and professional career in general. The conclusions points to the need to ensure adequate working conditions in cognitive and psychic aspects, among others.Theoretical and methodological contributions: We present major literature articles, smart industry definitions, main technologies, and grouping benefits and challenges to the human factor.

Comparative Assessment on Linearity Test based V2π and Vπ/2 Voltage Variations of Closed Loop IFOG

2016 ◽  
Vol 6 (2) ◽  
pp. 583
Author(s):  
T. Sireesha ◽  
K. Krishna Murthy
Keyword(s):  
Closed Loop ◽  
Signal Frequency ◽  
Percentage Error ◽  
Fiber Optic Gyroscope ◽  
Closed Loop System ◽  
Ramp Voltage ◽  
Grade Performance ◽  
Linearity Test ◽  
Ramp Signal ◽  
Made In

Interferometric Fiber Optic Gyroscope (IFOG) has to operate in closed loop condition to achieve inertial grade performance. The closed loop system is mainly depends upon the amplitude of the ramp signal (V2π of IOC) and bias (square wave) signal frequency (f<sub>bias</sub>). The digital phase ramp function is given as feedback to the optical system and makes gyro to null condition. The peak-to-peak amplitude (Vπ/2) of biasing signal is one-fourth of the ramp amplitude (V2π). If there are any variations in the amplitude of the ramp and biasing signals, then it introduces variations in the gyro performance. In this paper, a comparative discussion made in the gyro parameters for three cases: (i) V2π (vary) &amp; Vπ/2 (constant), (ii) Vπ/2 (vary) &amp; V2π (constant) and (iii) both V2π and Vπ/2 are varying simultaneously. The effects on gyroscope are described with the derived values in terms of linearity. From the experimental results, it was observed that the gyro output is very sensitive with respect to V2π variations and obtained the percentage error of 10% in gyro output, but very less effect due to Vπ/2 variations. So, the proper resetting of ramp voltage (V2π) is required to avoid nonlinearities and instabilities in gyro output.

VVER 1000 Pressurizer System and Control Modelling in Dymola

2018 ◽  
Author(s):  
Anna Fořtová ◽  
Filip Ježek
Keyword(s):  
Automatic Control ◽  
Nuclear Power ◽  
Reactor Power ◽  
Self Control ◽  
Primary Circuit ◽  
Saturation State ◽  
Power Change ◽  
And Control ◽  
Control Regime ◽  
Made In

The pressurizer is responsible for controlling the pressure and temperature in the primary circuit of the nuclear power plant. It is basically a pressure vessel, filled partially with water and partially with steam at saturation state. The controlling process can be described by two regimes, either by the self-control regime or by the automatic control regime. This paper is describing the simplified automatic control regime on the model of the pressurizer in the primary circuit of VVER 1000 made in Dymola software with the ClaRa library. Reactor power change and corresponding steam generator power change are the actuators in the simulation. The behaviour of the coolant level and pressure in the pressurizer is simulated in the model and it is then compared with data provided by the supplier of VVER 1000.

Organic Analysis of Hevea Latex VIII. Development of a General Scheme of Analysis

1946 ◽  
Vol 19 (3) ◽  
pp. 781-787 ◽  
Author(s):  
R. F. A. Altman
Keyword(s):  
Organic Compounds ◽  
General Scheme ◽  
Practical Experience ◽  
The Other ◽  
Complete Analysis ◽  
Organic Analysis ◽  
Original State ◽  
Quantitative Separation ◽  
Ideal Method ◽  
Made In

Abstract An attempt is made in this work to show the desirability and the practicability of a complete analysis of Hevea latex. It has been found that fresh, unammoniated latex is the only trustworthy starting material for analysis. Difficulties encountered in the analysis are due principally to (1) the trouble-some property of the rubber hydrocarbon to adsorb, and hold firmly, the other components of latex; (2) probable chemical, enzymic, and bacterial changes, which cause great difficulties in the isolation of those components in the state in which they are originally present in latex, and (3) the lack of proven methods of quantitative separation of the various groups of organic compounds. In his attempt at an ideal method of analysis, the author, due to the above-named difficulties, is faced with the apparent impossibility, as yet, of separating the various components of latex quantitatively and in the original state in which they are present in the latex. As a result of much theoretical considera- tion and practical experience, gained meantime, the author has reached a method, the scheme of which is described in the present work.

Accident and risk evaluation on Finnish Antarctic expeditions

Polar Record ◽  
1992 ◽  
Vol 28 (165) ◽  
pp. 145-148 ◽  
Author(s):  
Anneli Pekkarinen ◽  
Sinikka Soini ◽  
Juhani Hassi ◽  
Heikki Laapio
Keyword(s):  
Risk Factors ◽  
Incidence Rate ◽  
Working Conditions ◽  
Risk Evaluation ◽  
Medical Doctor ◽  
Weather Factors ◽  
The Antarctic ◽  
Made In ◽  
Snow And Ice

AbstractThe first Finnish expedition to the Antarctic, made in 1988–89, included five men. The second, a year later, included 57, mostly researchers. Accidents that occurred during the expeditions were recorded by a medical doctor and their incidence rate and severity were estimated. The few accidents that occurred did not cause disability. Some 20 risk factors were evaluated from two questionnaires filled out during the journeys to and from Antarctica, using a scale from extremely safe to extremely unsafe. Working conditions were judged safer than had been expected, as were weather factors (wind, temperature, ice and snow circumstances). The most dangerous items identified, in order of importance, were moving along unmarked routes, weariness, unexpected dangers, hurry and tight schedules, and snow and ice. During the homeward journey, equipment for communication and for moving as well as personal equipment were judged more dangerous than had been expected in advance. Preparations for future expeditions should give more attention to these factors.

Occupational Morbidity Based on Social Insurance Records in Finland

1983 ◽  
Vol 11 (2) ◽  
pp. 41-52
Author(s):  
Kari Vinni
Keyword(s):  
Economic Development ◽  
Working Conditions ◽  
Life Style ◽  
Social Insurance ◽  
Social Conditions ◽  
Occupational Groups ◽  
Occupational Differences ◽  
Socio Economic Development ◽  
Daily Allowance ◽  
Made In

Daily allowances and invalidity pensions were studied in order to identify morbidity differences between different occupational groups. The highest age-standardized number of daily allowances was found in ‘industry’ (males 257/1 000, females 373/1 000), and the lowest in administration (males 116/1000, females 170/1 000). The greatest number of new invalidity pensions for males was also in industry (20.3/1 000), and was 2.9 times as high as in administration. The greatest number of invalidity pensions to females was found in agriculture (18.3/1 000), and was 2.8 times as high as administration. These invalidity pension and daily allowance data measure the morbidity, which is closely associated with socio-economic development and the advances made in the insurance system of the country. Occupational differences in invalidity pensions and daily allowances can be affected by differences in working conditions or by differences in social conditions and life style. The morbidity differences are also affected by selection and survival processes. However, there were also real morbidity differences between occupational groups even after adjusting for bias and errors.

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