Bulletin of the Transilvania University of Brasov. Series I - Engineering Sciences

Decision-Making Under Uncertainty in Automotive Metrology

2026-02-19T07:10:20+00:00

This paper presents a structured risk assessment applied to industrial metrology processes in the automotive components sector. The study focuses on identifying and evaluating potential sources of uncertainty and disruption that may affect measurement accuracy, repeatability, and compliance. Using a qualitative model based on expert judgment and a standardized risk scoring system, ten common risks were assessed within the operational context of an accredited metrology laboratory. Most of the identified risks were categorized as tolerable and manageable under current procedures. However, the analysis highlights the added value of implementing context-specific mitigation strategies, even for low-probability or low-impact risks. These strategies include preventive maintenance, external audits, digital monitoring, and staff training, measures that enhance both measurement reliability and organizational resilience. The findings support a proactive, cost-effective approach to risk management that aligns with international quality standards and contributes to long-term operational continuity.

The Definition of Environmental Monitoring. Part II

2026-02-19T09:34:42+00:00

This study continues the legislative approach of the environmental monitoring definition. One of the research results was the identification of clear classification criteria. A second result of this study consists in proposing a definition that would exclude the possibility of confusion between environmental monitoring and the other three instruments analysed (environmental assessment, environmental inspection, and environmental analysis).

QR Code Generator Web Application with Free Customization and Analytics Features

2026-02-19T06:31:48+00:00

The QR Code Generator proposed in this paper is a web-based platform designed to facilitate the creation, customization, and analytics of QR codes for diverse applications, including marketing and communication. All functionalities are open source and are fully accessible through the website. This work is motivated by the scarcity of freely available online services offering comprehensive functionality and advanced customization, as most existing solutions are restricted to limited trial periods. This paper presents the algorithm underpinning the QR code generation process. In addition, the entire application is open source and may be freely deployed or hosted by third parties.

Comparative Study of the Performance of Macpherson and Multi-Link Suspensions in Dynamic Conditions

2026-02-19T09:08:56+00:00

This paper presents a comparative study between two representative automotive suspension architectures, namely the MacPherson strut and the Multilink system, with the objective of evaluating their dynamic behaviour and vibration response when subjected to different operating conditions. The analysis was conducted through virtual simulations in ADAMS/View, focusing on the suspension subsystem without steering components, and included both time-domain and frequency-domain evaluations. Kinematic investigations were first performed, examining camber angle variation versus wheel travel, which directly influences lateral grip and tire–road contact stability. Dynamic analyses were carried out by simulating vehicle response when crossing standardized road obstacles, where body accelerations and oscillation damping characteristics were monitored, thus providing an indication of ride comfort and vibration decay. In addition, a sine sweep excitation was applied to study transmissibility and resonance behaviour over a broad frequency spectrum, highlighting the suspension’s ability to isolate vibrations from the chassis. Finally, a performance synthesis was realized through a KPI radar chart, integrating comfort, stability, toe control, durability, and grip into a comparative framework.

Modeling and Characterization of a Regenerative Shock Absorber for Improved Vehicle Efficiency

2026-02-19T06:58:20+00:00

This paper proposes the development of an innovative model of a regenerative shock absorber, capable of transforming the kinetic energy dissipated during the operation of the suspension into an additional source of electrical energy. The system is based on a classic hydraulic shock absorber, modified by integrating an energy conversion module, which uses the internal oil pressure to drive a hydraulic mill-type mechanism. This generates rotary motion transmitted to an electric micro-generator, connected to the vehicle's storage system. The modelling and functional analysis of the system are performed in the Simulink environment, where the dynamics of the entire assembly in real operating conditions are simulated.

Solutions for Improving the Sustainability of Reinforced Concrete Elements

2026-02-19T06:43:19+00:00

Improving sustainability of reinforced concrete structures suppose structural measures, technological measures and construction process engineering measures. In this context, the article presents solutions for improving the sustainability of reinforced concrete structures such as: use of precast prestressed concrete elements (purlins); replacing CEM I cement with CEM II/A; using recycled aggregates and self-compacting concrete; replacing in concrete elements of the stirrups in the central area with fiber reinforced concrete. Experimental data obtained for three testing elements (with and without of stirrups) are: longitudinal strains, beam deflection for different level of load. The results presented indicate, in terms of strains, deflection, and cracking, similar behavior of the three tested purlins under test conditions, up to the load values corresponding to normal service loads (no cracks were observed up to this load level) and design loads, respectively.

Improving Flood Hazard Mapping in Nistorești: A LiDAR-Based Comparison with FRMP

2026-02-19T06:51:17+00:00

This study analyses the flood hazard limits for the locality of Nistorești, in the Casimcea river basin, based on LiDAR-derived digital terrain models integrated into hydraulic simulations. The results highlight discrepancies between the modelled inundation extents and those currently defined in the Flood Risk Management Plan (FRMP), suggesting that in some areas the official flood boundaries underestimate the actual hazard. These findings underline the importance of incorporating updated topographic data and advanced hydraulic modelling techniques in the revision of flood risk maps, in order to provide more accurate and reliable tools for local risk management and planning in Nistorești.