Zeitschriften und Ausgaben

Volumen 18 (2022): Heft 1 (June 2022)

Volumen 17 (2021): Heft 1 (June 2021)

Volumen 16 (2020): Heft 2 (December 2020)

Volumen 16 (2020): Heft 1 (January 2020)

Volumen 15 (2019): Heft 2 (December 2019)

Volumen 15 (2019): Heft 1 (September 2019)

Volumen 14 (2018): Heft 2 (December 2018)

Volumen 14 (2018): Heft 1 (July 2018)

Volumen 13 (2017): Heft 1 (December 2017)

Volumen 12 (2017): Heft 1 (July 2017)

Volumen 11 (2016): Heft 1 (December 2016)

Volumen 10 (2016): Heft 1 (July 2016)

Volumen 9 (2015): Heft 1 (December 2015)

Volumen 8 (2015): Heft 1 (July 2015)

Volumen 7 (2014): Heft 1 (December 2014)

Volumen 6 (2014): Heft 1 (October 2014)

Volumen 5 (2014): Heft 1 (May 2014)

Volumen 4 (2013): Heft 1 (December 2013)

Volumen 3 (2013): Heft 1 (August 2013)

Volumen 2 (2013): Heft 1 (April 2013)

Volumen 1 (2012): Heft 1 (December 2012)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2255-9159
Erstveröffentlichung
31 Jan 2013
Erscheinungsweise
2 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 16 (2020): Heft 2 (December 2020)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2255-9159
Erstveröffentlichung
31 Jan 2013
Erscheinungsweise
2 Hefte pro Jahr
Sprachen
Englisch

Suche

7 Artikel
Open Access

Use of Simulator Equipment for the Development and Testing of Vessel Control Systems

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 58 - 64

Zusammenfassung

Abstract

One of the ways to reduce human influence on the control process is the development of automated and automatic control systems. Modern control systems are quite complex and require preliminary ground testing. The article considers the issues of creating Imitation Modelling Stand for such control system synthesis and testing. For this reason, a Control System Model was integrated into the local computer network of the navigation simulator NTPRO 5000. The authors of the paper developed and tested software for information exchange between the navigation simulator and the Control System Model. The authors also developed a functional module of collision avoidance with many targets for testing in a closed loop system with virtual training objects. The results showed that the developed Imitation Modelling Stand allowed developing and testing functional modules of the control systems. In comparison with the found analogues, it is easy to include in a closed simulation cycle various models of command devices, actuators, control objects, objects of training scene, weather conditions; it is universal both for solving problems of manual control and for developing and testing automatic and automated control systems; it is not highly specialised and is created at minimal costs.

Schlüsselwörter

  • Automatic control
  • Closed loop systems
  • Collision avoidance
  • Control system synthesis
  • Motion control
Open Access

Wind Speed Distribution Direct Approximation by Accumulative Statistics of Measurements and Root-Mean-Square Deviation Control

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 65 - 71

Zusammenfassung

Abstract

In order to accurately estimate wind farm output and subsequently optimise it, a method of wind speed distribution approximation is suggested. The method is based on period-by-period accumulation of wind speed measurements, transforming them into empirical probabilities, and observing the moving approximation to the expected power produced by the wind turbine or entire wind farm. A year is a minimal term during which wind statistics are to be accumulated. The sufficient validity and reliability of the wind speed distribution approximation is supported by controlling root -mean-square deviations and maximal absolute deviations with respect to the moving average of the expected power. The approximation quality can be regulated by adjusting constants defining the requirements to the moving deviations.

Schlüsselwörter

  • Accumulative statistics
  • Approximation
  • Empirical probabilities
  • Moving parameter
  • Root-mean-square deviation control
  • Wind power
  • Wind speed distribution
Open Access

Design of Acoustic Signals for a Seal Deterrent Device

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 72 - 77

Zusammenfassung

Abstract

During the past decade, attacks by grey seals on fishing nets in the Baltic Sea have caused considerable loss of fish catch and damage to fishing gears. One of the approaches to reduce the number of seal attacks on fishing nets is to use acoustic deterrent devices (ADDs). Unfortunately, most of the commercially available ADDs are not well suited to the deployment in the sea and require considerable additional investments. The objective of the present research is to develop a compact and cost-efficient ADD for deployment in the sea environment. This paper is devoted to the design of acoustic signals for a prototype ADD. Signals from other experimental and commercially available ADDs are studied and compared. Moreover, limitations imposed by the underwater environment, transducers, battery power, and fish hearing are analysed and considered during the development of signal patterns. The results of tests conducted in an artificial reservoir and in the sea are presented.

Schlüsselwörter

  • Acoustic applications
  • Acoustic measurements
  • Acoustic wave
  • Seals
  • Signal synthesis
  • Underwater acoustics
  • Underwater communication
Open Access

Effectively Tunable Bandpass Waveguide Filter Based on Incorporation of Coupled Cylindrical Resonators Cut in Half

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 78 - 87

Zusammenfassung

Abstract

A novel mechanically tunable waveguide dielectric filter is presented in this paper. The resonant structure of the filter is made of a rectangular waveguide cavity and an H-plane dielectric cylinder cut in half. The resonating frequency of the proposed structure can be significantly changed by moving two split cylinder parts. The coupling matrix synthesis technique is used to create the required bandpass filter. A drawback of the proposed structure is that the tuning process invokes a mismatch between the feeding structure and the filter. To overcome this drawback, the tuning screws between the coupling irises are used. A filter with the proposed geometry has a large frequency tuning range as well as relatively constant passband bandwidth.

Schlüsselwörter

  • Bandpass filters
  • Coupled resonator filters
  • Dielectric filters
  • Tuning
  • Waveguide filters
Open Access

Low-Power Agriculture IoT System with LoRa: Open Field Storage Observation

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 88 - 94

Zusammenfassung

Abstract

The last decade has seen multiple research work on the use of LoRaWAN technology in smart agriculture. In open field storage, monitoring is crucial for increasing the logistics efficiency and improving crop quality. As battery maintenance is expensive in such areas, LoRa is a suitable technology that allows for low-power communications. Within the framework of the research, a prototype has been built for tracking goods in open field storage. The battery lifetime has been analysed through calculations and measurements using LoRa communications. Our findings indicate that although sleeping current has the smallest percentage, it has the greatest effect on increasing the battery life, for longer battery life LoRa node must have a low self-discharge battery, and finally, sensors are the main battery depleting factor on the LoRa node.

Schlüsselwörter

  • Agriculture
  • Battery lifetime
  • Food storage
  • IoT
  • LoRa
  • Low-power application
Open Access

Algorithms for Railway Embedded Control Devices for Safety Manoeuvres

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 95 - 101

Zusammenfassung

Abstract

This study is dedicated to solve manoeuvres making task while working on the station with no marshalling hump. It is part of the project aimed at the development of intelligent safety and optimal control systems of autonomous electric vehicles and transport in general. The main manoeuvres safety depends on the lack of items and other objects on the rails as well as on the position of turnouts. In most cases rails, occupied with other wagons, as well as the wrong position of turnouts are marked with prohibiting red or blue signals of the traffic light. The authors propose an algorithm for the traffic light recognition by using a convolutional neural network (CNN) and traffic light indicator recognition. However, the situation when the locomotive needs to drive on the rails occupied with other wagons, for example, during the manoeuvres on the railway station can also appear. For this purpose, the authors have developed a CNN algorithm for the wagon recognition on the rails.

Schlüsselwörter

  • Convolutional Neural Network
  • Electric transport
  • Locomotive braking system
  • Microcontroller
  • Object recognition
  • Railway
  • Safety
  • Traffic light
Open Access

Experimental Comparison of Designed Inductance Coils for Wireless Power Transfer

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 102 - 109

Zusammenfassung

Abstract

The paper is devoted to the comparison of different types and different values of coils for inductive power transfer in the classical circuit. This topic is relevant with the growing demand and interest in wireless chargers and the diversity of inductance coils for wireless power transfer. The main geometric parameters affecting the coil efficiency are determined. For experimental verification the classical scheme for wireless power transfer is used based on a full-bridge inverter. Different coils at different distance between them, lateral misalignment and load resistance changed are tested. It is determined that single-layer coils have better transmit-receive efficiency than double-layer ones, especially with series-series compensation topology. The application of two-layer coils is recommended in case of high input current. The investigated samples have efficiency at the level of industrial standards. The design approach can be used for any level of power and application, including wireless charging of electric vehicle batteries.

Schlüsselwörter

  • AC-DC power converters electromagnetic coupling
  • Finite element modelling
  • Inductive power transmission
  • Wireless power transfer
7 Artikel
Open Access

Use of Simulator Equipment for the Development and Testing of Vessel Control Systems

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 58 - 64

Zusammenfassung

Abstract

One of the ways to reduce human influence on the control process is the development of automated and automatic control systems. Modern control systems are quite complex and require preliminary ground testing. The article considers the issues of creating Imitation Modelling Stand for such control system synthesis and testing. For this reason, a Control System Model was integrated into the local computer network of the navigation simulator NTPRO 5000. The authors of the paper developed and tested software for information exchange between the navigation simulator and the Control System Model. The authors also developed a functional module of collision avoidance with many targets for testing in a closed loop system with virtual training objects. The results showed that the developed Imitation Modelling Stand allowed developing and testing functional modules of the control systems. In comparison with the found analogues, it is easy to include in a closed simulation cycle various models of command devices, actuators, control objects, objects of training scene, weather conditions; it is universal both for solving problems of manual control and for developing and testing automatic and automated control systems; it is not highly specialised and is created at minimal costs.

Schlüsselwörter

  • Automatic control
  • Closed loop systems
  • Collision avoidance
  • Control system synthesis
  • Motion control
Open Access

Wind Speed Distribution Direct Approximation by Accumulative Statistics of Measurements and Root-Mean-Square Deviation Control

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 65 - 71

Zusammenfassung

Abstract

In order to accurately estimate wind farm output and subsequently optimise it, a method of wind speed distribution approximation is suggested. The method is based on period-by-period accumulation of wind speed measurements, transforming them into empirical probabilities, and observing the moving approximation to the expected power produced by the wind turbine or entire wind farm. A year is a minimal term during which wind statistics are to be accumulated. The sufficient validity and reliability of the wind speed distribution approximation is supported by controlling root -mean-square deviations and maximal absolute deviations with respect to the moving average of the expected power. The approximation quality can be regulated by adjusting constants defining the requirements to the moving deviations.

Schlüsselwörter

  • Accumulative statistics
  • Approximation
  • Empirical probabilities
  • Moving parameter
  • Root-mean-square deviation control
  • Wind power
  • Wind speed distribution
Open Access

Design of Acoustic Signals for a Seal Deterrent Device

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 72 - 77

Zusammenfassung

Abstract

During the past decade, attacks by grey seals on fishing nets in the Baltic Sea have caused considerable loss of fish catch and damage to fishing gears. One of the approaches to reduce the number of seal attacks on fishing nets is to use acoustic deterrent devices (ADDs). Unfortunately, most of the commercially available ADDs are not well suited to the deployment in the sea and require considerable additional investments. The objective of the present research is to develop a compact and cost-efficient ADD for deployment in the sea environment. This paper is devoted to the design of acoustic signals for a prototype ADD. Signals from other experimental and commercially available ADDs are studied and compared. Moreover, limitations imposed by the underwater environment, transducers, battery power, and fish hearing are analysed and considered during the development of signal patterns. The results of tests conducted in an artificial reservoir and in the sea are presented.

Schlüsselwörter

  • Acoustic applications
  • Acoustic measurements
  • Acoustic wave
  • Seals
  • Signal synthesis
  • Underwater acoustics
  • Underwater communication
Open Access

Effectively Tunable Bandpass Waveguide Filter Based on Incorporation of Coupled Cylindrical Resonators Cut in Half

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 78 - 87

Zusammenfassung

Abstract

A novel mechanically tunable waveguide dielectric filter is presented in this paper. The resonant structure of the filter is made of a rectangular waveguide cavity and an H-plane dielectric cylinder cut in half. The resonating frequency of the proposed structure can be significantly changed by moving two split cylinder parts. The coupling matrix synthesis technique is used to create the required bandpass filter. A drawback of the proposed structure is that the tuning process invokes a mismatch between the feeding structure and the filter. To overcome this drawback, the tuning screws between the coupling irises are used. A filter with the proposed geometry has a large frequency tuning range as well as relatively constant passband bandwidth.

Schlüsselwörter

  • Bandpass filters
  • Coupled resonator filters
  • Dielectric filters
  • Tuning
  • Waveguide filters
Open Access

Low-Power Agriculture IoT System with LoRa: Open Field Storage Observation

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 88 - 94

Zusammenfassung

Abstract

The last decade has seen multiple research work on the use of LoRaWAN technology in smart agriculture. In open field storage, monitoring is crucial for increasing the logistics efficiency and improving crop quality. As battery maintenance is expensive in such areas, LoRa is a suitable technology that allows for low-power communications. Within the framework of the research, a prototype has been built for tracking goods in open field storage. The battery lifetime has been analysed through calculations and measurements using LoRa communications. Our findings indicate that although sleeping current has the smallest percentage, it has the greatest effect on increasing the battery life, for longer battery life LoRa node must have a low self-discharge battery, and finally, sensors are the main battery depleting factor on the LoRa node.

Schlüsselwörter

  • Agriculture
  • Battery lifetime
  • Food storage
  • IoT
  • LoRa
  • Low-power application
Open Access

Algorithms for Railway Embedded Control Devices for Safety Manoeuvres

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 95 - 101

Zusammenfassung

Abstract

This study is dedicated to solve manoeuvres making task while working on the station with no marshalling hump. It is part of the project aimed at the development of intelligent safety and optimal control systems of autonomous electric vehicles and transport in general. The main manoeuvres safety depends on the lack of items and other objects on the rails as well as on the position of turnouts. In most cases rails, occupied with other wagons, as well as the wrong position of turnouts are marked with prohibiting red or blue signals of the traffic light. The authors propose an algorithm for the traffic light recognition by using a convolutional neural network (CNN) and traffic light indicator recognition. However, the situation when the locomotive needs to drive on the rails occupied with other wagons, for example, during the manoeuvres on the railway station can also appear. For this purpose, the authors have developed a CNN algorithm for the wagon recognition on the rails.

Schlüsselwörter

  • Convolutional Neural Network
  • Electric transport
  • Locomotive braking system
  • Microcontroller
  • Object recognition
  • Railway
  • Safety
  • Traffic light
Open Access

Experimental Comparison of Designed Inductance Coils for Wireless Power Transfer

Online veröffentlicht: 12 Apr 2021
Seitenbereich: 102 - 109

Zusammenfassung

Abstract

The paper is devoted to the comparison of different types and different values of coils for inductive power transfer in the classical circuit. This topic is relevant with the growing demand and interest in wireless chargers and the diversity of inductance coils for wireless power transfer. The main geometric parameters affecting the coil efficiency are determined. For experimental verification the classical scheme for wireless power transfer is used based on a full-bridge inverter. Different coils at different distance between them, lateral misalignment and load resistance changed are tested. It is determined that single-layer coils have better transmit-receive efficiency than double-layer ones, especially with series-series compensation topology. The application of two-layer coils is recommended in case of high input current. The investigated samples have efficiency at the level of industrial standards. The design approach can be used for any level of power and application, including wireless charging of electric vehicle batteries.

Schlüsselwörter

  • AC-DC power converters electromagnetic coupling
  • Finite element modelling
  • Inductive power transmission
  • Wireless power transfer

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