In order to meet the challenges of extracting high precision Doppler frequencies and the low measurement accuracy in laser Doppler velocimetry systems, a high-precision laser speed measurement system based on a dual-b...
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Digital holography (DH) plays a significant role in non-destructive testing, and quantitative phase imaging [1]. Various geometries of the DH have been proposed and some of these are in-line, off-axis, and phase-shift...
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The FGS is one of two scientific instruments on board the ESA ARIEL space telescope, which ESA plans to launch in 2029. The aim of the mission is to characterize the atmospheres of several hundred different exoplanets...
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ISBN:
(纸本)9781510675087;9781510675070
The FGS is one of two scientific instruments on board the ESA ARIEL space telescope, which ESA plans to launch in 2029. The aim of the mission is to characterize the atmospheres of several hundred different exoplanets. The FGS is an opto-electronic instrument - a photometer and a near infra-red spectrometer. Although FGS stands for Fine Guidance System, in fact it has two main goals: to deliver scientific data of observed exoplanets, precisely speaking, their atmospheres, and to support the spacecraft's AOCS with very precise pointing and guiding towards observation objects. This paper presents an overview of the current FGS design and implementation. The instrument is in the middle step between successfully passed iPDR and upcoming iCDR. Up to now, the team successfully built a prototype of the instrument, and is working on the manufacturing of the engineering and engineering-qualification models.
Modelling approaches for industry are typically classified into data-driven and physics-based models. The first type often struggles to interpret the complexities of physical systems and require enough data to capture...
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ISBN:
(纸本)9783031765964;9783031765971
Modelling approaches for industry are typically classified into data-driven and physics-based models. The first type often struggles to interpret the complexities of physical systems and require enough data to capture patterns, while the second type depends on detailed information, which might be only partially available or subject to uncertainty. The recent methodology of Physics-Informed Neural Networks (PINNs) is investigated as a hybrid approach that integrates neural network flexibility with the definition of physical constraints. The work focuses first on a review of PINNs applications in industry, highlighting their advantages over traditional methods in terms of efficiency and versatility. Then, methods and tools for PINN implementation are described and a general mathematical formulation is provided. In order to validate the model, a case study concerning the prediction of the thermal power of an industrial Air Handling Unit (AHU) is proposed, detailing the implementation process. The results show good performance compared to traditional data-driven techniques, highlighting the main advantages of this hybrid approach, such as the efficiency even with simple physical models and a smaller amount of training data. Future research directions include the implementation of variants of PINNs with different neural network models or different forms of integration of physical knowledge.
Two recent projects at Spectral Sciences Inc. have a goal of benefiting the calibration of overhead optical sensors. In the first, we have developed a vicarious calibration method that utilizes our MODTRAN software, t...
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Satellite Communication caters to the growing demand of Bandwidth requirements by incorporating the DVB-S2 standard, as it assures the credibility of data sent over the wireless link through efficient bandwidth manage...
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In the dual-function radar-communication (DFRC) system, the radar and communication waveforms will be distorted and the signal-to-interference-plus-noise ratio (SINR) of DFRC system and downlink user will decrease whe...
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This paper discusses the effect of considering manufacturing tolerance uncertainty on the robustness of radial electromagnetic force in permanent magnet synchronous machines(PMSMs). This research presents a method for...
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The infrared continuous zoom optical system can realize the continuous change of focal distance in a certain range and keep the image surface stable and clear in the whole process of field of view change. Further inte...
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In municipal pipeline engineering, the retaining of ultra-deep structures often employs a cylindrical structure composed of an underground wall. However, existing engineering manuals and literature primarily discuss t...
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