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Sorin Musuroi
Electrical Engineering Department, Faculty of Electrical and Power Engineering, University Politehnica Timisoara, 300223 Timisoara, Romania

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Journal article
Published: 27 September 2020 in Electronics
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In the last decade, modern vehicles have become very complex, being equipped with embedded electronic systems which include more than a thousand of electronic control units (ECUs). Therefore, it is mandatory to analyze the potential risk of automotive systems failure because it could have a significant impact on humans’ safety. This paper proposes a novel, functional safety concept at the power management level of a system basis chip (SBC), from the development phase to system design. In the presented case, the safety-critical application is represented by a powertrain transmission electronic control unit. A step-by-step design guideline procedure is presented, having as a focus the cost, safety, and performance to obtain a robust, cost-efficient, safe, and reliable design. To prove compliance with the ISO 26262 standard, quantitative worst-case evaluations of the hardware have been done. The assessment results qualify the proposed design with automotive safety integrity levels (ASIL, up to ASIL-D). The main contribution of this paper is to demonstrate how to apply the functional safety concept to a real, safety-critical system by following the proposed design methodology.

ACS Style

Diana Raluca Biba; Mihaela Codruta Ancuti; Alexandru Ianovici; Ciprian Sorandaru; Sorin Musuroi. Power Supply Platform and Functional Safety Concept Proposals for a Powertrain Transmission Electronic Control Unit. Electronics 2020, 9, 1580 .

AMA Style

Diana Raluca Biba, Mihaela Codruta Ancuti, Alexandru Ianovici, Ciprian Sorandaru, Sorin Musuroi. Power Supply Platform and Functional Safety Concept Proposals for a Powertrain Transmission Electronic Control Unit. Electronics. 2020; 9 (10):1580.

Chicago/Turabian Style

Diana Raluca Biba; Mihaela Codruta Ancuti; Alexandru Ianovici; Ciprian Sorandaru; Sorin Musuroi. 2020. "Power Supply Platform and Functional Safety Concept Proposals for a Powertrain Transmission Electronic Control Unit." Electronics 9, no. 10: 1580.

Journal article
Published: 20 June 2020 in Applied Sciences
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The wind turbine’s operation is affected by the wind speed variations, which cannot be followed by the wind turbine due to the large moment of the power plant’s inertia. The method proposed in this paper belongs to the wind turbine power curves (WTPC) approach, which expresses the power curve of the permanent magnet synchronous generator (PMSG) by a set of mathematical equations. The WTPC research papers published before now have not taken into consideration the total power plant inertia at time-variable wind speeds, when the wind turbine’s optimal operation is very difficult to be reached, and its efficiency is thus threatened. The study is based on a wind turbine having a large moment of total inertia, and demonstrates, through extensive simulation results, that the optimal values of the PMSG’s power can be determined based on the kinetic motion equation. This PMSG’s optimal power represents an ideal time-varying curve, and the wind turbine should be controlled so as to closely follow it. For this purpose, proportional integral (PI) and proportional integral derivative (PID) type-based control methods were implemented and analyzed, so that the PMSG’s power oscillations could be reduced, and the PMSG’s angular speed value made comparable to the optimal one, meaning that the wind turbine operates within the optimal operation area, and is efficient. The simulations are actually the numerical solutions obtained by using the Scientific Workplace simulation environment, and they are based on the wind speed measurements collected from a wind farm located in Dobrogea, Romania.

ACS Style

Mihaela-Codruta Ancuti; Sorin Musuroi; Ciprian Sorandaru; Marian Dordescu; Geza Mihai Erdodi. Wind Turbines Optimal Operation at Time Variable Wind Speeds. Applied Sciences 2020, 10, 4232 .

AMA Style

Mihaela-Codruta Ancuti, Sorin Musuroi, Ciprian Sorandaru, Marian Dordescu, Geza Mihai Erdodi. Wind Turbines Optimal Operation at Time Variable Wind Speeds. Applied Sciences. 2020; 10 (12):4232.

Chicago/Turabian Style

Mihaela-Codruta Ancuti; Sorin Musuroi; Ciprian Sorandaru; Marian Dordescu; Geza Mihai Erdodi. 2020. "Wind Turbines Optimal Operation at Time Variable Wind Speeds." Applied Sciences 10, no. 12: 4232.

Journal article
Published: 08 June 2020 in International Journal of Computers Communications & Control
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This article will present a simple technical solution for a low-power and real-time air quality monitoring system. The whole package of software and hardware technical solutions applied for recording, transmitting and analyzing data is briefly described. This original monitoring system integrates a single chip microcon-troller, several dedicated air pollution surveillance sensors (for PM10, PM2.5, SO2, NO2, CO, O3, VOC, CO2), a LoRaWAN communication module and an online platform. This system was tested and applied under real field conditions. Depending on the measured values, it provides alerts, or, it can lead to the re-placement of specific components in the exhaust equipment. This article will pre-sent some experimental results, validated also by official measurements of government operated air quality stations.

ACS Style

Attila Simo; Simona Dzitac; Flaviu Mihai Frigura-Iliasa; Sorin Musuroi; Petru Andea; Dragoș Meianu. Technical Solution for a Real-Time Air Quality Monitoring System. International Journal of Computers Communications & Control 2020, 15, 1 .

AMA Style

Attila Simo, Simona Dzitac, Flaviu Mihai Frigura-Iliasa, Sorin Musuroi, Petru Andea, Dragoș Meianu. Technical Solution for a Real-Time Air Quality Monitoring System. International Journal of Computers Communications & Control. 2020; 15 (4):1.

Chicago/Turabian Style

Attila Simo; Simona Dzitac; Flaviu Mihai Frigura-Iliasa; Sorin Musuroi; Petru Andea; Dragoș Meianu. 2020. "Technical Solution for a Real-Time Air Quality Monitoring System." International Journal of Computers Communications & Control 15, no. 4: 1.

Journal article
Published: 29 December 2019 in Applied Sciences
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With respect to health issues, this paperpresents the results of an electromagnetic field (EMF) assessment in the proximity of a high voltage power station located in South Transylvania, Romania. The main parameters taken into account are, according to all standards and recommendations, the RMS (Root Mean Square) value of low frequency (0–300 Hz) electrical field strength E (in kV/m) and magnetic flux density B (in µT). Measurements were performed near all critical pieces of equipment (transformers, switches, busbars, overhead lines), according to the EMF European Directive. Some measurements were made as a function of distance from the HV (high-voltage) equipment, others as a time variation. The main objective was to verify that specific limits are met and, if necessary, to identify protective measures. Finally, safe exposure times for personnel operating at these sites were determined. In the future, detailed maps of EMF variations will be made available to the power companies.

ACS Style

Mihaela Frigura-Iliasa; Felicia Ioana Baloi; Flaviu Mihai Frigura-Iliasa; Attila Simo; Sorin Musuroi; Petru Andea. Health-Related Electromagnetic Field Assessment in the Proximity of High Voltage Power Equipment. Applied Sciences 2019, 10, 260 .

AMA Style

Mihaela Frigura-Iliasa, Felicia Ioana Baloi, Flaviu Mihai Frigura-Iliasa, Attila Simo, Sorin Musuroi, Petru Andea. Health-Related Electromagnetic Field Assessment in the Proximity of High Voltage Power Equipment. Applied Sciences. 2019; 10 (1):260.

Chicago/Turabian Style

Mihaela Frigura-Iliasa; Felicia Ioana Baloi; Flaviu Mihai Frigura-Iliasa; Attila Simo; Sorin Musuroi; Petru Andea. 2019. "Health-Related Electromagnetic Field Assessment in the Proximity of High Voltage Power Equipment." Applied Sciences 10, no. 1: 260.

Journal article
Published: 27 February 2019 in Sustainability
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Due to high mechanical inertia and rapid variations in wind speed over time, at variable wind speeds, the problem of operation in the optimal energetic area becomes complex and in due time it is not always solvable. No work has been found that analyzes the energy-optimal operation of a wind system operating at variable wind speeds over time and that considers the variation of the wind speed over time. In this paper, we take into account the evolution of wind speed over time and its measurement with a low-power turbine, which operates with no load at the mechanical angular velocity ωMAX. The optimal velocity is calculated. The energy that is captured by the wind turbine significantly depends on the mechanical angular velocity. In order to perform a function in the maximum power point (MPP) power point area, the load on the electric generator is changed, and the optimum mechanical velocity is estimated, ωOPTIM, knowing that the ratio ωOPTIM/ωMAX does not depend on the time variation of the wind speed.

ACS Style

Ciprian Sorandaru; Sorin Musuroi; Flaviu Frigura-Iliasa; Doru Vatau; Marian Dordescu. Analysis of the Wind System Operation in the Optimal Energetic Area at Variable Wind Speed over Time. Sustainability 2019, 11, 1249 .

AMA Style

Ciprian Sorandaru, Sorin Musuroi, Flaviu Frigura-Iliasa, Doru Vatau, Marian Dordescu. Analysis of the Wind System Operation in the Optimal Energetic Area at Variable Wind Speed over Time. Sustainability. 2019; 11 (5):1249.

Chicago/Turabian Style

Ciprian Sorandaru; Sorin Musuroi; Flaviu Frigura-Iliasa; Doru Vatau; Marian Dordescu. 2019. "Analysis of the Wind System Operation in the Optimal Energetic Area at Variable Wind Speed over Time." Sustainability 11, no. 5: 1249.

Journal article
Published: 08 February 2019 in Energies
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Metal oxide varistors are applied today inside modern surge arresters for overvoltage protection for all voltage levels. Their main issue is the thermal activation of their crossing current, which could lead to complete destruction by thermal runaway. This article presents a new technological solution developed in order to increase the thermal stability of metal oxide varistors. It consists in connecting in parallel two or more similar varistors (for dividing their current), having a thermal coupling between them (for equalizing their temperatures and forcing them to act together and simultaneously as much as possible). Starting from a finite element computer model performed for each situation (varistor standalone or parallel), up to real measurements, the thermal stability of the equipment was analyzed in permanent and impulse regime. Experiments were carried out in the same conditions. Experimental data obtain from two disk varistors corresponds very well to simulations, proving that parallel connection of varistors, combined with a thermal exchange between them is an efficient technical solution for thermal stability improvement, even if not apparently economically justified.

ACS Style

Flaviu Mihai Frigura-Iliasa; Sorin Musuroi; Ciprian Sorandaru; Doru Vatau. Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling. Energies 2019, 12, 536 .

AMA Style

Flaviu Mihai Frigura-Iliasa, Sorin Musuroi, Ciprian Sorandaru, Doru Vatau. Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling. Energies. 2019; 12 (3):536.

Chicago/Turabian Style

Flaviu Mihai Frigura-Iliasa; Sorin Musuroi; Ciprian Sorandaru; Doru Vatau. 2019. "Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling." Energies 12, no. 3: 536.

Journal article
Published: 02 January 2019 in Processes
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At the beginning, this article details the manufacturing procedures for varistor materials. Starting from the initial composition of two large series of varistors (those with two additive oxides and those with five additive oxides), there is a major overview of the main stages of the technological process and the equipment used for the production, emphasizing the technological changes that were made. The article continues with the study of the influence of the sintering pressure and the sintering temperature on the electrical properties of the varistor materials made before. There were two experimental series of 7 varistors, one series based on 2 additive oxides and one based on 5 additive oxides. Each varistor of these series was sintered at another temperature, the fundamental purpose being to determine an optimal sintering temperature for each chemical composition. A second activity consisted of manufacturing two more series of varistors with the same chemical composition (2 oxides and 5 additive oxides), which were sintered at two different pressures, for having a set of conclusions on the influence of sintering pressure on the electric performances. All conclusions are underlying a new process for manufacturing metal oxide based varistors.

ACS Style

Flaviu Mihai Frigura-Iliasa; Sorin Musuroi; Ciprian Sorandaru; Doru Vatau. New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process. Processes 2019, 7, 18 .

AMA Style

Flaviu Mihai Frigura-Iliasa, Sorin Musuroi, Ciprian Sorandaru, Doru Vatau. New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process. Processes. 2019; 7 (1):18.

Chicago/Turabian Style

Flaviu Mihai Frigura-Iliasa; Sorin Musuroi; Ciprian Sorandaru; Doru Vatau. 2019. "New Technical Parameters and Operational Improvements of the Metal Oxide Varistors Manufacturing Process." Processes 7, no. 1: 18.