When dealing with millimeter wave communications, one way to mitigate the path loss contribution involves the use of beam steering and beamforming techniques, which allow to improve the gain of the antenna system. Par...
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ISBN:
(纸本)9798350387186;9798350387179
When dealing with millimeter wave communications, one way to mitigate the path loss contribution involves the use of beam steering and beamforming techniques, which allow to improve the gain of the antenna system. Particularly interesting is the case of adaptive beamformers, which are able to steer the antenna radiation pattern towards the position of a given target in real-time. In this work, we propose a novel architecture for adaptive beam steering based on real-time Angle-of-Arrival (AoA) estimation. The phase shift is introduced in the Local Oscillator (LO) path thanks to a modified DDS-PLL structure. The main equations are presented, along with a validation campaign involving hardware-in-the-loop (HiL) simulations.
With the advent of advanced communication technologies, networked control systems have seen remarkable growth in recent times. Although numerous theoretical works exist in this field, solid experimental testbeds featu...
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ISBN:
(纸本)9798331518509;9798331518493
With the advent of advanced communication technologies, networked control systems have seen remarkable growth in recent times. Although numerous theoretical works exist in this field, solid experimental testbeds featuring actual hardware with networking capabilities that emulate real systems under real channel conditions are rare. This work aims to fill this gap by designing and developing a hardware-in-the-loop system with networking capabilities using software defined radios for closed-loop testing of hardware devices in a networked control environment before their actual deployment.
The EXTREMA THruster-In-the-loop Experiment (ETHILE) is a facility designed for testing the effectiveness and robustness of spacecraft guidance algorithms through hardware actuation. Initially designed to simulate in ...
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The EXTREMA THruster-In-the-loop Experiment (ETHILE) is a facility designed for testing the effectiveness and robustness of spacecraft guidance algorithms through hardware actuation. Initially designed to simulate in an accelerated framework the actuation of interplanetary transfers with low-thrust, the system is highly configurable as it can simulate different thruster behaviours with a thruster balance equipped with a compressed air nozzle. An overview of the system and its performance is given, highlighting through a practical example its possible use for research and educational purposes. Copyright (c) 2024 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/)
In modern telecommunications systems, high frequencies lead to higher losses. One way to mitigate the path loss contribution is in the use of beam steering and beamforming techniques, which allow to improve the antenn...
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ISBN:
(纸本)9798350390797;9789532901351
In modern telecommunications systems, high frequencies lead to higher losses. One way to mitigate the path loss contribution is in the use of beam steering and beamforming techniques, which allow to improve the antenna system gain. Nowadays, the interest is put in adaptive systems, which steer the antenna pattern towards the position of a given target. In this work, we proposed a novel architecture for adaptive beam steering based on the Angle-of-Arrival (AoA) estimation. The phase shift is introduced in the Local Oscillator (LO) path thanks to a modified and lightweight DDS-PLL structure. After having described the architecture, the main dimensioning equations are presented. The architecture is validated through a hardware-in-the-loop (HiL) simulation campaign.
For the simulation of a physiological capnogram with a lung simulator it is important to homogenize CO2 in the expiratory air adequately with a mixing element, while being limited in size and energy consumption. We de...
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For the simulation of a physiological capnogram with a lung simulator it is important to homogenize CO2 in the expiratory air adequately with a mixing element, while being limited in size and energy consumption. We design and test static in-line mixers based on helical blade (Kenics) design and crossbars (SMX) design for optimized homogenization of CO2 in air. We investigate the effect of design variations such as element length and number on gas homogenization and pressure loss coefficient zeta. With the chosen assessment method, we find that the SMX design mixer provides the best compromise between homogenization and pressure loss. Copyright (C) 2024 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/)
This study presents pioneering safety strategies in last-mile vehicle engineering, focusing on autonomous delivery vehicles (ADVs). It delves into the integration of advanced sensor technologies, predictive algorithms...
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ISBN:
(纸本)9798350395976;9798350395969
This study presents pioneering safety strategies in last-mile vehicle engineering, focusing on autonomous delivery vehicles (ADVs). It delves into the integration of advanced sensor technologies, predictive algorithms, and vehicle design optimizations aimed at mitigating the inherent risks associated with urban delivery systems. The research encompasses the development of neural network-based models for dynamic risk prediction and the application of hardware-in-the-loop (HIL) testing for enhanced safety evaluation. The findings demonstrate significant potential in reducing accidents, contributing to safer urban environments, and paving the way for future advancements in the realm of autonomous vehicle safety. The study emphasizes the importance of a holistic approach to vehicle engineering, where safety is considered at every stage of design and operation, underscoring our commitment to the ambitious goal of achieving 'zero accidents' in urban delivery scenarios.
Hybrid electric buses have been a promising technology to dramatically lower fuel consumption and carbon dioxide (CO2) emission, while energy management strategy (EMS) is a critical technology to the improvements in f...
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Hybrid electric buses have been a promising technology to dramatically lower fuel consumption and carbon dioxide (CO2) emission, while energy management strategy (EMS) is a critical technology to the improvements in fuel economy for hybrid electric vehicles (HEVs). In this paper, a suboptimal EMS is developed for the real-time control of a series-parallel hybrid electric bus. It is then investigated and verified in a hardware-in-the-loop (HIL) simulation system constructed on PT-LABCAR, a commercial real-time simulator. First, an optimal EMS is obtained via iterative dynamic programming (IDP) by defining a cost function over a specific drive cycle to minimize fuel consumption, as well as to achieve zero battery state-of-charge (SOC) change and to avoid frequent clutch operation. The IDP method can lower the computational burden and improve the accuracy. Second, the suboptimal EMS for real-time control is developed by constructing an Elman neural network (NN) based on the aforementioned optimal EMS, so the real-time suboptimal EMS can be used in the vehicle control unit (VCU) of the hybrid bus. The real VCU is investigated and verified utilizing a HIL simulator in a virtual forward-facing HEV environment consisting of vehicle, driver and driving environment. The simulation results demonstrate that the proposed real-time suboptimal EMS by the neural network can coordinate the overall hybrid powertrain of the hybrid bus to optimize fuel economy over different drive cycles, and the given drive cycles can be tracked while sustaining the battery SOC level. (C) 2012 Elsevier B.V. All rights reserved.
Considering the difficulties existed in the practical courses for mechatronic system design, a new practical training method was proposed based on the semi-physical simulation technology. In this method a simulator bo...
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This paper provides an overview of microgrid control strategies, examining differences between centralized and decentralized approaches, and focusing on classical hierarchical control schemes as well as the structure ...
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The validation and verification of real-time embedded systems (RTES) in aviation demand rigorous testing frameworks capable of addressing safety, performance, and reliability under diverse operational conditions. The ...
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