Leonids Ribickis

Riga Technical University | RTU · Faculty of Electrical and Environmental Engineering

The study focuses on the development and evaluation of a motion control system for the Large Range Robotic Motion Simulator (LaRRMoS), which is based on a serial manipulator with 6 degrees-of-freedom. Two motion cueing algorithms (MCAs) – Classical Washout Filter (CWF) and Classical Washout Filter with Cylindrical coordinates (CYL) – are implemente...

The paper describes the control system of an autonomous agriculture robot and evaluates its operation using a laboratory stand and a digital environment. AgroBot is an autonomous sea buckthorn berry harvesting robot. It automatically finds the bush branches to harvest, cuts them, and stores them in a box. AgroBot consists of a 3 DOF (Degrees of Fre...

The chapter is related to the safe and energy-efficient motion of autonomous drones and describes the developed novel immune neural network-based machine learning technology for its control. The technology is inspired by two biological systems – immune system and neural networks and their artificial analogs and evolutionary theory. The developed no...

Race to Zero challenge is a world-wide activity for the universities and colleges to foster the climate goals. This paper analyses the potential of Riga Technical University (RTU) for this action. Different renewable energy sources (PV, wind generators) have been discussed to be installed around the RTU campus. The profiles of electric power consum...

According to standards, the lighting system is one of the key elements to provide safety on city roads, defined by quality parameters. LED technology and movement detection sensor interaction bring about new regulation techniques, creating an energy-efficient smart LED lighting system concept. This paper reveals extensive comparative data analysis...

The current feedback is considered as unavoidable part of most control system driving power electronic converters. However, it is possible to eliminate the use of current sensor, if properly calculated volt-second balance is applied to input inductor. This paper describes the implementation of current sensorless control technique applied to neutral...

The increasing importance of continuingly complex Cyber-Physical Systems (CPS) challenges and encourages universities worldwide to organize up-to-date CPS oriented educational programs. The Erasmus+ project “CybPhys” aims to support CPS oriented educational programs in Belarus and Ukraine. We put forward a hypothesis that the educational situation,...

When operating a hybrid vehicle (HEV), it is important to reduce maintenance and repair costs. The HEV electric drive (ED) consists of electronic, electrical and mechanical parts and is considered a complex diagnostic model. The availability of an electrical part greatly simplifies the process of monitoring and obtaining information about the state...

The paper aims at researching and developing an adaptive control system algorithm and its implementation and integration in the control system of the existing unmanned aerial vehicle (UAV). The authors describe the mathematical model of UAV and target function for energy consumption minimisation and possible searching algorithms for UAV optimal con...

Role of burn-in in the life cycle of power electronics assemblies is discussed in this paper. Differences between burn-in and other production screening methods are highlighted. This paper reviews burn-in testing as a part of production reliability improvement program, discussing its benefits and challenges/

The successful career of graduates, which focus on development and maintenance of adaptive systems, apart to the main background in electrical engineering, requires strong abilities to work with users of developed device, entrepreneurship skills, knowledge of marketing and ability to develop market oriented product. This paper demonstrates the appr...

In this paper we discuss the Internet of Things (IoT) and industrial systems automation approach application for development a prototype of an autonomous beekeeping system. In this research we focus on one of the Arrowhead Framework core systems named the Event Handler system. MQTT service broker being a part of autonomous beekeeping system demonst...

This paper is devoted to a detailed experimentally based analysis of applicability of vector network analyzers for measuring impedance of surface mount inductors with and without DC bias. The measurements are made using custom-made bias tees and a test fixture with an ordinary vector network analyzer. The main attention in the analysis is focused o...

Paper present real manufacturing application based approach to DC based power supply and infrastructure verification. Alternative solutions for improved management of power flows and integration of renewable energy sources has become an interesting topic and discussions of alternative DC related power infrastructure with respect to existing technol...

Education of students in electrical engineering must provide learning outcomes and enable the engineer of electrical engineering to work in the industry and use modern technological equipment with sophisticated automated electrotechnical equipment. Moreover, the learning process and its outcomes should provide students with the skills needed and ap...

This work presents the development of industry-oriented, student-centered master-level curricular in the field of physical sciences in Belarus. The main target of ERASMUS+ project "Improvement of master-level education in the field of physical sciences in Belarusian universities" (Physics) is to facilitate the Bologna process in the Belarusian high...

This study is dedicated to solve a collision prevention task for autonomous unmanned aerial vehicles' (UAVs) team by Immune Neuro-Fuzzy Network (INFN) application. It is a part of the project aimed at the development of intelligent safety and optimal control systems of autonomous electric vehicles and transport in general. The goal of the current r...

This paper considers the effect of copper shields placed between differential-mode CLC filter components and the effect of the component placement on conducted electromagnetic interference of a switch-mode power supply. The study is based on comparative measurements of a power supply conducted electromagnetic interference for different configuratio...

In this paper 3D electromagnetic modelling of surface-mount components of EMI filters is presented. Developed models in CST MWS are used to analyze parasitic couplings between surface-mount inductors and surface-mount inductors and capacitors. The couplings are evaluated in terms of transmission coefficients. Modelling results are then verified exp...

The aim of this article is to explore Riga Technical University (RTU) approach to Sustainable Development, sustainability governance practice and its impact. In order to successfully implement sustainability as an essential part of organizations daily operations, processes should be properly governed, communicated and adequate resources should be a...

Research described in this article provides analysis of potential improvements gained to management process of higher education institutions and strategic planning by applying EFQM model and European Standarts and Guidelines (ESG). This research indicates the most crucial process elements of strategic planning in higher education institutions. Auth...

The Scientific monograph explores the problems associated with modelling of an ongoing urban environment process in order to ensure a high level of automated infrastructure management. Scientific novelty of the monograph related to the development of modern intelligent systems and sensors network technology, using high-performance computing technol...

This paper describes the use of smart materials and adaptronic control concepts in small size robots. Small size in this specific research means that robot hand have the span from several centimeters to some tens of centimeters. The possibility of building robot mechanics using different kind of smart materials are analyzed. There is no target to b...

The purpose of this paper is to address current issues in industrial robotics applications and to address also the current trends occurring in the industry regarding smaller mobile units in factory and external manufacturing processes relating to the battery powering of robotics devices. Specifically, we shall concentrate the efforts herein on “Mob...

The article presents a case study of experience sharing between the EU universities and the EU neighborhood area — Belarus. The aim of this study is to facilitate the Bologna process joining by the Belarusian higher education system and, in particular, to consider challenges related to the labor market in the field of physics specialties due to upc...

Mutual couplings between EMI filter components are of key concern when designing EMI filters for EMI attenuation in high frequency range. To reduce the parasitic couplings and improve EMI attenuation conductive shields can be placed between the components. This paper presents modeling and measurements of EMI filters with copper shields placed betwe...

Modeling of differential mode EMI filter is presented in this paper. 3D electromagnetic field modeling software CST MWS is used as a simulation tool. EMI filter consisting of two capacitors and two inductors is modeled considering parasitic mutual couplings between EMI filter components. Modeling is performed for different positions of capacitors a...

This article explores the importance of internationalization and valorization in technical Universities as one of core priorities for achieving international excellence and strengthening university – industry collaboration. The World is becoming more interconnected and Higher Education institutions can no more act on their own – they are motiva...

Paper presents analysis of the management survey data, identifying the factors that influence strategy development and implementation. Paper describes significance of employee involvement in the strategy development process, defining incentives for employees, creation of activity plan, regular overview of achieved results and necessity of revision...

This paper deals with modeling of differential mode Pi-type EMI power filter using 3D electromagnetic field modeling software CST MWS. Two scenarios are considered: inductor is positioned in parallel or perpendicular to capacitors. Capacitor distance and PCB track layout is changed to verify software modeling precision and capabilities. Measurement...

We consider a distribution network evolution involving highly automated systems with PMUs. We argue that PMU-based grid control operations carried out autonomously would be faster and more cost efficient than current manned operations. Controls that are capable of optimizing the system could significantly improve performance and reliability. PMUs a...

Bidirectional energy flow monitoring near 230 V AC or 600 V DC micro-grid consumers — industrial devices or household consumers — rise questions regarding measurement methods and devices self power consumption, price and precision. Article deals with overall 3×230V+N AC and 600V DC micro-grid bidirectional monitoring system design as well as measur...

This paper is devoted to EMI filter inductor modeling and mutual coupling modeling between two inductors positioned on PCB. 3D inductor models are developed and modeled in CST MWS. Comparison of inductors mutual coupling measurement and modeling results show that transfer coefficients can be predicted accurately. CST MWS has been used also to predi...

Over the last decades, WSN systems enabled quality monitoring of power, heat production and water supply process. Empirical and practical evidence shows that the development of new services, which require new business models, is necessary. To address this issue, a framework for evaluating service prototypes and associated business models is propose...

The article gives an overview of various researches dealing with smart or intelligent street lighting systems, and what is meant with this term in different countries. Several available architectures of smart street lighting systems as well as those for future are described and discussed. Further some researches and developments of such systems in...

Mobile robots are being utilized increasingly in many applications, which include the exploration of relatively unknown environments including aerial, undersea, volcanic or even alien environments such as the plateaus and deserts of Mars where the Curiosity or Rover robot and others continue to explore. Due to their mobile nature these robots prese...

The Republic of Latvia has promulgated a number of laws that govern the national response to emergencies in water and wastewater.

In this paper modeling of EMI filter capacitors and modeling of mutual couplings between them is presented. The modeling has been done using 3D electromagnetic software CST MWS. Three capacitor models have been proposed and verified experimentally. All proposed models during verification have shown that their performance is high enough to enable PC...

Intelligent 'street lighting', along with its immense energy saving potential, relies upon many factors, not least, the importance of maintaining useable levels of light for both vehicles and pedestrian traffic. One element in the establishment of such a regime is the development of sensory equipment capable of vehicle and human detection with a ne...

Critical infrastructure's (CI) (electricity, heat, water, information and communication technology networks) security, stability and reliability are closely related to the interaction phenomenon. Due to the increasing amount of data transferred, increases dependence on telecommunications and internet services, the data integrity and security is bec...

Water distribution networks require long term autonomous monitoring solutions, integrated, reliable and cost effective data transfer methods. This paper investigates the data delivery infrastructure of water distribution network sensor equipment used for network monitoring and billing of the subscribers. Water distribution network usually apply sen...

This paper analyzes two maximum power point tracking (MPPT) converter topologies that are part of an interface converter for the integration of photovoltaics (PV) in the grid. Two different MPPT converter topologies (boost converter and quasi-Z-Source (qZS) converter) were selected and compared. Theoretical comparison includes an analysis of regula...

Higher education institutions need well-considered strategy with clear action plan that sets development paths for the University. Though it is important not only to create a strategy but also to pay attention to the development process of this important document. Paper describes strategy development process, most important components of the strate...

It is state of the art for many drive systems like those used in industrial robotics, conveyor systems or diverse numerical control machinery to have a common DC bus power system architecture. Due to regenerative braking, the DC bus voltage increases until a certain limit, which is limited means of a balancing resistor (brake chopper). Systems that...

This research deals with investigation of different consumer equipment electrical characteristics. Equipment of three different households are measured and analyzed. Further a current sensor technology was chosen and consumption measurement methodology and algorithm were developed. Five consumption measurement devices for local energy monitoring sy...

A tracked crawler robot using body heat detection and a purpose built analogue tracking circuit is designed in this work. The infrared detection module consists of a single dual element pyroelectric infrared sensor. The drive and steering control system is designed using a single chip 74HCXX Quad 2-input NAND gate as the logic controller and provid...

The rapid technology development in the electrical engineering requires to promote life long learning concept in practice. The industrial needs and future carrier perspectives are not limited to the college or university degree for electrical engineers. The sharing of advanced research results, the development IT platform for education allows to ac...

Electrical and heat energy production expenses are constantly rising nowadays. Energy consumption monitoring allows reducing overall energy consumption by identifying ineffective energy use. The article deals with event based energy consumption monitoring method and system. Event based monitoring simplifies communication between monitoring devices...

The education of electrical engineers is popular subject in universities curricula's as in Europe, as worldwide. The methodological approach and needed qualification is standardized in national level, however the technological development level and carrier perspectives requires mutual recognition of education between counties. This article aimed to...

To feed sensors on different turning or rotating shafts of electrical motors, like servo, stepper or DC motor shafts, pan/tilt and different robotic system rotating parts, especially where rotations are up to 3600 and more turns of rotation, conventional wire loop cannot be applied. The same problem also lies with data transmission from sensor. The...

The utilization of only existing radiant sources in autonomous and mobile robotics is a relatively new field. These radiant sources, referred to as ambient radiation were "the noise and errors" in the production of various range finding and obstacle locating sensors. The research looks to developing methods to utilize this "noise" for autonomous ro...

Practical workshops are one of the key points to achieve good knowledge in engineering. Faculty or campus based workshops allow to practice only several of hours per week or less due to limited workplaces. Limited possibilities set longer time to finish course, especially if the university has divisions in different cities, offering the same learni...

The upgrading of the DH system through installing wireless sensor networks (WSN) - a technology by which to monitor and control quality operation of the DH system - will lead to more effective use of thermal energy, enabling also the provision of quality customer services, as the data concerning the status of the existing networks is available in a...

Intelligent LED dimmer demand in lighting market is increasing due to energy saving potential, environment protection as well as great possibility of control and management of lighting systems. An internet web browser controlled LED lighting systems is developed and described in the article. The 1st is radio-wave and internet implementation between...