Kaspars Kondratjevs

Vehicle weight detection sensor development for data collecting in sustainable city transport system

The technical solution for smart city concept is offered in the article. The IoT supporting new generation of control concept is developed for smart city paradigm. The offered unified wireless data transmitting concept is deployed as wireless transport vehicles weight control tool. The integrated weight sensor is developed and demonstrated in this article. The offered sensor is integrated in IoT paradigm, and aimed to obtain data from primary source and transfer it to Intelligent Transport System (ITS) in order to use those data for transport flow modeling. The data transferred to ITS will be used acquired used elements of offered the system: sensing technologies, data transferring, simulation of traffic flows and decision making. The developed solution is compatible with IoT on-line traffic management system and next generation of smart city control system.

Sensor networking for improving of reliability indicator by electric Power Utilities

The modern emergency situation remote localization solution was discussed. In this paper remote emergency situation localization technical solutions and showcases was described. In the theoretical background description there is description of fault localization techniques-distribution characteristics. The remote monitoring system interface program is described and detailed. There is a monitoring system interface, which is actively used by emergency localisation and positioning by system engineers and administrators. The technical solution description and analyses of functional and operation conditions are offered. The experimental part consists of the electric principal scheme of the low and medium voltage network, which is used for decision making in indicators and modems location and calculations. Moreover, there is described the equipment used for proposed solution. The next generation wireless sensor network solution was developed.

ISM transmitter density estimation for telemetry sensors in high rise apartment buildings

Constrained wireless sensor nodes in dense high rise buildings encounter negative effects from the industrial, scientific and medical (ISM) radio band interference and collisions. A method of wireless sensor density estimation is proposed as an experiment. An experimental analysis of frequency channel structure is tested and a feasible modulation and data structure is proposed to maximize sensor node life expectancy and the upper limits of node density is estimated. The target applications of the transmitters are energy (heating, water supply infrastructure, electricity monitoring) and environment parameters - moisture, CO2, air temperature.

Solutions For Smart Metering Under Harsh Environmental Condicions

Abstract The described case study concerns application of wireless sensor networks to the smart control of power supply substations. The solution proposed for metering is based on the modular principle and has been tested in the intersystem communication paradigm using selectable interface modules (IEEE 802.3, ISM radio interface, GSM/GPRS). The solution modularity gives 7 % savings of maintenance costs. The developed solution can be applied to the control of different critical infrastructure networks using adapted modules. The proposed smart metering is suitable for outdoor installation, indoor industrial installations, operation under electromagnetic pollution, temperature and humidity impact. The results of tests have shown a good electromagnetic compatibility of the prototype meter with other electronic devices. The metering procedure is exemplified by operation of a testing companys workers under harsh environmental conditions.

Temperature Sensor Feasibility Study of Wireless Sensor Network Applications for Heating Efficiency Maintenance in High-Rise Apartment Buildings

Abstract Cities are responsible for 60%-80% of the world’s energy use and for approximately the same percentage of greenhouse gas emissions. The existing multi-apartment buildings of multifamily housing sector are often energy inefficient, and the heating system does not ensure optimization of heat distribution of individual apartments. Heat distribution, heating system balancing, heat loss detection and calculation, individual heat energy accounting are difficult tasks to accomplish. This article deals with the temperature monitoring system designed to retrieve temperature differences necessary for overall building heat monitoring and individual apartment monitoring. The sensor testing case study process and its measurements are analysed.

Wireless sensor networks based control system development for water supply infrastructure

The early detection of leaks in water supply pipelines and water theft prevention is an economically important issue not only for Latvian water utilities. However, monitoring and control of underground infrastructure presents a severe challenge. In recent years, wireless sensor networks are applied for Automated Meters Reading (AMR) and Advanced Metering Infrastructure (AMI). In this paper, authors propose a particular wireless sensor networks solution for water distribution network monitoring system. The case study of solution successfully piloted at water distribution networks in Latvian city Ventspils is described.

Sensor networking and signal processing applications for heating efficiency maintenance in high-rise apartment buildings

The main goal of the research is development and practical implementation of new methods for processing large amount of data in building automation, which will allow acquiring, storing and interpreting data about the urban environment as well as modelling its processes using high performance computation and next generation smart sensor infrastructure. This will ensure automatic or semi-automatic high level decision making to minimize losses and damages in case of any critical situation. In order to determine how much energy efficiency can be achieved through technological solutions described in EN 15232 standard, a number of experiments is carried out in this work.

Transition from Legacy to Connectivity Solution for Infrastructure Control of Smart Municipal Systems

Abstract Collaboration between heterogeneous systems and architectures is not an easy problem in the automation domain. By now, utilities and suppliers encounter real problems due to underestimated costs of technical solutions, frustration in selecting technical solutions relevant for local needs, and incompatibilities between a plenty of protocols and appropriate solutions. The paper presents research on creation of architecture of smart municipal systems in a local cloud of services that apply SOA and IoT approaches. The authors of the paper have developed a broker that applies orchestration services and resides on a gateway, which provides adapter and protocol translation functions, as well as applies a tool for wiring together hardware devices, APIs and online services.

Development of Power Supply Management Module for Radio Signal Repeaters of Automatic Metering Reading System in Variable Solar Density Conditions

Abstract In recent years, there has been significant research focus that revolves around harvesting and minimising energy consumption by wireless sensor network nodes. When a sensor node is depleted of energy, it becomes unresponsive and disconnected from the network that can significantly influence the performance of the whole network. The purpose of the present research is to create a power supply management module in order to provide stable operating voltage for autonomous operations of radio signal repeaters, sensors or gateways of WSN. The developed management module is composed of a solar panel, lithium battery and power supply management module. The novelty of the research is the management module, which ensures stable and uninterrupted operations of electronic equipment in various power supply modes in different situations, simultaneously ensuring energy protection and sustainability of the module components. The management module is able to provide power supply of 5 V for electronics scheme independently, without power interruption switching between power sources and power flows in different directions.

Development of Dynamically Optimized Wireless Transmission System for Wireless Sensor Networks in Highrise Apartment Building Heating Systems / Optimizētas Dinamiskās Bezvadu Sensoru Tīklu Pārraides Risinājuma Izstrāde Daudzstāvu Ēku Apkures Sistēmas Parametru Izgūšanai Un Vadībai

Abstract Smart meters will be at the centre of the integrated solutions, including interaction with other networks in the next decade. The developed solution for multi-apartment building ventilation and heating parameter monitoring aims to increase energy efficiency and optimal control of the existing system. Dynamic control of heat and ventilation systems, heat loss detection, calculation and mitigation, and individual heat energy accounting are difficult tasks to accomplish. This article deals with the data transmission system using battery powered ISM band radio transmitters. The temperature measurement sensors with cumulative temperature reading are used as sensor part for this solution. The offered approach to monitoring system is used for overall building and individual apartment monitoring. Data coding and antenna designs are explained for this particular application. Kopsavilkums Daudzstāvu ēkas, kuras nav sākotnēji plānotas integrācijai ar ēku vadības sistēmām, rada kompleksu problemātisko vidi modernizācijai. Vadu sensoru sistēmu uzstādīšana šādās ēkās kļūst nepraktiska vai pat neiespējama. Šī iemesla dēļ ir nepieciešamas efektīvas bezvadu sensoru sistēmas, kas spētu nodrošināt mērījumu nogādi, ņemot vērā daudzstāvu ēku specifiku. Rakstā tiek piedāvāts bezvadu sensoru tīkla risinājums efektīvai datu pārraidei siltumapgādes sistēmas parametru izgūšanai. Tiek izstrādāta un aprobēta specializētā virziena antena efektīvai radio telegrammu savākšanai no dzīvokļiem, nogādājot mērījumus datu koncentratoros. Ziņojumu telegrammu efektīvai pārraidei tiek piedāvāta datu kodēšanas kumulatīvā metode. Piedāvātais risinājums pielietojams gan jaunām, gan esošām ēkām. Izgūtie dati ir pielietojami siltuma apgādes sistēmas uzraudzībai, regulēšanai, kā arī individuālā siltuma patēriņa tarifikācijai.