Росен Милетиев - Academia.edu (original) (raw)

Papers by Росен Милетиев

Механика Транспорт Комуникации - Научно списание,, 2019

The current paper represents a multiprotocol sensor network based on inertial MEMS sensors which ... more The current paper represents a multiprotocol sensor network based on inertial MEMS sensors which is capable of measuring the accelerations of the given point of the network. The proposed network consists of two branches-CAN and USART(I 2 C/LIN) bus which are independent. The master sensor may read the slave sensor data from one of the selected protocols depends from the network length, network nodes, noisy environment, etc. The possible topologies, communication principle and network analysis is performed.

International Conference on Digital Information Processing and Communications, 2013

The current paper describes the information and communication system, based on micromechanical in... more The current paper describes the information and communication system, based on micromechanical inertial sensors (MEMS) to measure the dynamic response and status of the vehicle suspension elements. It consists of an inertial sensor network from at least two sensors, which are situated on the moving elements of the vehicle suspension. The communication system part reads and stores the inertial sensor data while the information system part calculates the frequency response, attenuation time, resonance frequencies and distance between moving parts. The calculated distance is compared with the adjusted clearance and the system accuracy is shown. It is shown that the system is capable to measure the distances from 0.6 to 1.0mm with 0.1mm accuracy. The inertial data scanning is performed with a sampling frequency of 160Hz, according to the expected peak accelerations and translations.

The paper discusses the application of the electronic measurement system based on MEMS inertial s... more The paper discusses the application of the electronic measurement system based on MEMS inertial sensors and GPS receiver which is capable to measure and record the dynamic parameters of the interaction of the bogie-railway system. The inertial data are combined with the GPS navigation data by Kalman filter to establish the tram bogie rotation angles. The derailed probability is calculated for all railway places on the basis of the frequency analysis.

The current paper discusses the asynchronous mode of the quad sensor structure to increase the Ny... more The current paper discusses the asynchronous mode of the quad sensor structure to increase the Nyquist limit. This may be achieved using uniform or nonuniform sampling schemes by control of the FSYNC inputs of the MEMS sensors. The studied mode is tested and the results show the possibility to increase the sensor performance using the quad sensor structure.

The current paper represents the processing algorithms of the multiprotocol sensor network based ... more The current paper represents the processing algorithms of the multiprotocol sensor network based on inertial MEMS sensors which is capable of measuring the accelerations of the given point of the network. Also some measurement results are shown to

Механика Транспорт Комуникации - Научно списание,, 2018

Proceedings of the 2014 37th International Spring Seminar on Electronics Technology, 2014

The paper discusses the hardware implementation of the quad sensor structure and the possibility ... more The paper discusses the hardware implementation of the quad sensor structure and the possibility to improve the noise characteristics of the structure when simultaneously sampling is accomplished. The histograms of the linear and angular accelerations are given to proof the theory of the structure, published in our previous paper. This structure may be manufactured as a single MEMS inertial sensor with better noise parameters.

MATEC web of conferences, 2019

The publication addresses the need for technical solutions to reduce the transmission of lateral ... more The publication addresses the need for technical solutions to reduce the transmission of lateral vibrations to passengers, especially children traveling by car in a child seat. A special design of a pendulum type tilting child seat has been proposed. Results of road trial conducted on a specific mountain road section are shown. The differences in the values of lateral accelerations acting on a child traveling in a conventional and in a tilting seat are given. The power spectral densities of lateral accelerations for both types of child seats are presented and compared. The root mean square values of lateral acceleration are given. Results for the values of the seat tilt angle are presented.

The paper discusses the development of the "test vehicle" system for preliminary test of the rail... more The paper discusses the development of the "test vehicle" system for preliminary test of the railroad. The test is accomplished on the basis of the own developed systems for data storage based on the GPS receiver and inertial sensors. All data are stored in the external energy independent memory (FLASH) while the navigation data are sent to the navigation server via GPRS network. The quality of the railway is determined according to the three axis acceleration analysis while the GPS receiver defines the event position. The experimental data are recorded on the selected part of the railroad and furthermore are analyzed.

Frequenz, 2007

The approximation method for spectral analysis of nonuniformly sampled data for radar application... more The approximation method for spectral analysis of nonuniformly sampled data for radar applications is presented. The method is a modification of the Koh-Sarkar-Wicks equation to estimate the frequency response at the arbitrary frequency. The initial equation is modified to reduce the computation time by using the modified fast Fourier transform (FFT) and stepped rows. Also approximation error and benchmark analysis are shown to complete the method properties.

The paper considers the inertial sensor spectrum analysis of the nonuniformly sampled data. The m... more The paper considers the inertial sensor spectrum analysis of the nonuniformly sampled data. The measurements are accomplished on a diesel engine D3900 by digital three-axis linear accelerometer. The spectrums of the uniformly and nonuniformly sampled inertial data are compared to accomplish the accurate real - time vibration monitoring of machine oscillations.

Conference proceedings, May 1, 2007

We present an evaluation of the performance of a simple hand-heldfiberoptic perimeter sensor whic... more We present an evaluation of the performance of a simple hand-heldfiberoptic perimeter sensor which can operate both in a few-and multi-mode regime of operation of the fibers used. Single fiber cables or stacked sequences offew-and multi-mode fibers can be used. Intermodal interference produces analog signal which is furtherfed into an 8 channel multiplexer and is then processed by a microprocessor. The unit features connection to a PC and a radio network. The responses to various types ofperturbations have been analyzed using Weibull dstributions.

Metrology and Measurement Systems, 2006

The current paper represents a portable battery powered system which is capable to measure and an... more The current paper represents a portable battery powered system which is capable to measure and analyze the data from different type of sensor data like humidity, air pollution gases, dust, smoke, etc. and send it via Bluetooth or GSM/GPRS connection to the remote devices. It contains GPRS modem with integrated Bluetooth module, integrated chip antenna, power management module, rechargeable Li-Ion battery and some analog or digital I/Os to connect to the internal or external sensors for data acquisition. This system may be used as a remote sensor system in smart homes, air monitoring stations, etc.

The current paper represent IoT indoor measurement system for real time monitoring of the particu... more The current paper represent IoT indoor measurement system for real time monitoring of the particulate matter such as PM1.0, PM2.5 and PM10. Also the environment parameters such as temperature and humidity is accomplished. The operational stability and long term performance are measured and analyzed. The measurement system send the data to the remote server when the particulate matter levels are calculated on 24h base and compared to the national standards. The system also allows Bluetooth connectivity to nearby receivers such as mobile phones to show the real-time PM levels.

Photonics Letters of Poland, Mar 31, 2010