This paper describes the development process and initial tests performed with a new energy dissipation damper based on Shape Memory Alloy (SMA) wires. The aim of this study was to develop iteration type devices, eventually methodology properly design them for any application. underlying concept our device is use double counteracting system pre-strained SMA wire sections as dissipating component. By using wires, focuses maximizing dissipation, partially relinquishing re-centering capabilities...

Beam management is a challenging task for millimeter wave (mmWave) and sub-terahertz communication systems, especially in scenarios with highly-mobile users. Leveraging external sensing modalities such as vision, LiDAR, radar, position, or combination of them, to address this beam challenge has recently attracted increasing interest from both academia industry. This mainly motivated by the dependency direction decision on user location geometry surrounding environment -- information that can...

A novel methodology to evaluate railway track support conditions is currently being developed. This based on modal analysis of the multi-element system composed by infrastructure and an instrumented vehicle. It belongs group vibration-based structural damage identification methods focused observing characteristic frequencies this system, which can be related with changes in physical properties infrastructure. As opposed other vehicle-based monitoring methods, proposed should enable condition...

A R&D Project was completed in Portugal that aimed at designing, developing and demonstrating the applicability of an innovative integrated approach to assess performance condition railway tracks. This is also expected contribute identify specific causes some track degradation, namely those are related characteristics layers geomaterials compose substructure track. system prototype developed installed on board a self-propelled maintenance vehicle. The designed continuously evaluate vertical...

Nowadays, there are multiple initiatives showing a renewed interest on railway transport of goods and passengers around the world. Thus, an efficient management infrastructures, both at operational level in terms economic profitability, is not only desirable but also corresponds to area ongoing research. In order contribute these efforts, alternative novel methodology evaluate track support conditions presented here, based modal analysis characteristic frequencies multi-element system...

While initial beam alignment (BA) in millimeter-wave networks has been thoroughly investigated, most research assumes a simplified terminal model based on uniform linear/planar arrays with isotropic antennas. Devices non-isotropic antenna elements need multiple panels to provide good spherical coverage, and exhaustive search over all beams of the leads unacceptable overhead. This paper proposes location- orientation-aware solution that manages BA for multi-panel devices. We present three...

A R&D Project was recently completed in Portugal that aimed at designing, developing and demonstrating the applicability of an innovative integrated approach to assess performance condition railway tracks. system prototype developed installed on board a self-propelled maintenance vehicle. The is designed continuously evaluate vertical stiffness track detect disturbances wheel rail dynamic contact interactions. also able post-process acquired data taking into account structural aspects track....

An air curtain is used to ensure an adequate separation between two compartments that aimed restrict, a clean one and contaminated one. The performance improved with the use of extraction from “contaminated” compartment. aerodynamic sealing optimized assessed regarding particulate matter. evaluation using visual assessment cold smoke source validated against PM 10 detection. It shown presents good for PM10 PM2.5 classes method can lead similar results. equation was obtained view be predict...

Localization in outdoor wireless systems typically requires transmitting specific reference signals to estimate distance (trilateration methods) or angle (triangulation methods). These cause overhead on communication, need a LoS link work well, and require multiple base stations, often imposing synchronization hardware requirements. Fingerprinting has none of these drawbacks, but building its database high human effort collect real-world measurements. For long time, this issue limited the...

A novel modeling solution (MS) was created that can provide realistically accurate results on the natural frequencies of a railway subgrade layer in context infrastructure numerical simulation. This MS specifically developed for implementation multibody simulation (MBS) model, which constitutes step forward relation to state-of-art this specific topic. The main obstacle find criterion define geometry and dimensions elements inside so resulting resonance would be representative. proposed...

Vertical air curtains are often used to separate two different zones reduce contaminant transfer or even provide aerodynamic sealing from one zone the other. In this isothermal full-size experimental research work, between is reduced using an extraction “contaminated” compartment and curtain. This work correlates minimum exhaust flow rate required reach at opening connecting with jet nozzle velocity for small thicknesses (5 mm, 10 mm 16 mm), particularly Reynolds numbers below 3800....

Wall coating mortars should have the ability to deform, without critical failure, when subjected loading actions, thermal cycles or shrinkage of mortar itself. When cannot cope with these deformations, internal stresses arise in layer. This can lead cracking, which is one most frequent and damaging anomalies building facades. To minimize this issue, knowledge mortar's modulus elasticity (E) essential during design process, order achieve proper compatibility between substrate regarding...

While initial beam alignment (BA) in millimeter-wave networks has been thoroughly investigated, most research assumes a simplified terminal model based on uniform linear/planar arrays with isotropic antennas. Devices non-isotropic antenna elements need multiple panels to provide good spherical coverage, and exhaustive search over all beams of the leads unacceptable overhead. This paper proposes location- orientation-aware solution that manages BA for multi-panel devices. We present three...