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5th International Conference on Mechanical, Control and Computer Engineering (ICMCCE)

作者： Zuo, Zhaoyang Wu, Yubin Chen, Po Meng, Dongrong Xijing Univ Sch Mech Engn Xian 710123 Shanxi Peoples R China Xian Res Inst High Technol Xian 710025 Shanxi Peoples R China

ISBN: (纸本)9781665423144

In the data post-processing of BDS/INS integrated navigation, the high precision smoothing algorithm is researched aimed at solving the problem of precision degradation caused by the loss of lock of the BDS receiver for a long time. The RTS smoothing algorithm is analyzed when the BDS signal is interrupted, and the equations are given at the same time experimental program are designed. The results show that RTS is not only able to have a smoothing effect on the navigation solution results, but also can significantly weaken the influence of BDS loss of lock to the integrated navigation system.

关键词： RTS BDS/INS Signal tracking data post-processing Application analysis

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A methodological approach for heat-flow meter data post-processing under different climatic conditions and wall orientations

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ENERGY AND BUILDINGS 2020年 223卷 110216-110216页

作者： Evangelisti, Luca Guattari, Claudia Vollaro, Roberto De Lieto Asdrubali, Francesco Roma TRE Univ Dept Engn Via Vito Volterra 62 I-00146 Rome Italy

The European Union has committed itself to reduce significantly greenhouse gas emissions. To achieve this goal, the European Green Deal is focused on energy efficiency and the decarbonization of the building stock. The implementation of energy saving measures in old buildings is one of the most effective strategies, but this needs the comprehension of the actual thermal behavior of the buildings' envelopes. One of the most important properties of walls is the thermal transmittance, which can be assessed through the Heat-Flow meter (HFM) method. It needs stable environmental conditions which may not always be satisfied. So, the data post-processing becomes fundamental. Here, an experimental investigation was conducted on a recently built structure, equipped with a solar shading device installed on the south facade. The HFM method was applied both on north and south walls. data were recorded during winter and summer for analyzing the influence of the external environmental conditions. Two methodological approaches were proposed, based on specific criteria for data selection. The aim of this study is therefore the proposal of regulated procedures for heat-flow meters data post-processing. The preliminary results are satisfactory, showing that the proposed methods can be considered reliable. (c) 2020 Elsevier B.V. All rights reserved.

关键词： Heat-flow meter method Thermal transmittance Wall orientation Environmental conditions data post-processing

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Influence of heating systems on thermal transmittance evaluations: Simulations, experimental measurements and data post-processing

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ENERGY AND BUILDINGS 2018年 168卷 180-190页

作者： Evangelisti, Luca Guattari, Claudia Asdrubali, Francesco Roma TRE Univ Dept Engn Via Vito Volterra 62 I-00146 Rome Italy Niccolo Cusano Univ Dept Engn Via Don Carlo Gnocchi 3 I-00166 Rome Italy

Nowadays, understanding the actual performance of building components is one of the key factor to achieve energy savings. For this reason, on-site measurements are essential but the boundary conditions during surveys can affect the final results. This can occur during heat flow meter measurements, when the thermal transmittance value of a wall can be influenced by disturbing factors, such as the heating system power-on and off. Due to this, the aim of this study is to investigate the influence of these disturbing factors, moving away from steady-state conditions. This research is divided in two main steps: a first critical analysis of data obtained by in-situ measurements and an investigation of how the mentioned disturbing factors can affect the final results, employing a FEM code, where stationary conditions are not respected;a second analysis related to the data post-processing procedures, proposing a new supplementary approach able to exclude heat flow distortions and able to obtain measured U-values closer to the calculated ones, according to ISO 6946. Starting from simulations and on-site measurements, the proposed method was preliminary validated, analyzing actual case studies characterized by heating systems with radiators and obtaining preliminary satisfying results. The simulations allowed to assess a reduction in the difference between the measured and the calculated U-value that goes from +22.1% to +0.7%. post processing of experimental data with the proposed methodology allowed to significantly reduce the difference between measured and calculated U-values (from +36.9% to -7.6% in the best case study). Starting from the preliminary results, the proposed approach seems to be promising with U-value corrections in accordance with the theoretical ones. Keywords: Thermal transmittance Heat flow meter Building wall simulations U-value measurements data post-processing (C) 2018 Elsevier B.V. All rights reserved.

关键词： Thermal transmittance Heat flow meter Building wall simulations U-value measurements data post-processing

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Preliminary development of a non-contact method for thermal characterization of building walls: Laboratory evaluation

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CASE STUDIES IN THERMAL ENGINEERING 2025年 69卷

作者： Evangelisti, Luca De Cristo, Edoardo Guattari, Claudia Gori, Paola De Rubeis, Tullio Monteleone, Salvatore Roma Tre Univ Dept Ind Elect & Mech Engn Via Vito Volterra 62 I-00146 Rome Italy Niccolo Cusano Univ Dept Engn Via Don Carlo Gnocchi 3 I-00166 Rome Italy Roma Tre Univ Dept Philosophy Commun & Performing Arts Via Ostiense 139 I-00154 Rome Italy Univ Aquila Dept Civil Construct Architectural & Environm Engn Piazzale Ernesto Pontieri I-67100 Laquila Italy

This work provides a preliminary experimental investigation with a laboratory setup for proposing a novel enhanced thermometric method, for the thermal characterization of building walls, utilizing a non-contact approach based on infrared thermometry. The goal is a non-invasive application in building diagnostics, particularly in heritage and architecturally sensitive contexts. This study aims to investigate two issues: (i) testing a procedure to automatically process data for determining suitable heat transfer coefficients when calculating heat fluxes when the thermometric method is applied;(ii) understanding the role of infrared thermometers in replacing contact temperature sensors in a proposed enhanced version of the thermometric method for heat flux calculation. Heat fluxes acquired through a commonly used sensor were compared with those computed through the proposed method based on convective and radiative heat transfer assessments. The findings validate the viability of the indirect procedure for calculating heat flux. However, discrepancies in surface temperature measurements were observed between contact and infrared sensors, with differences below 0.5 degrees C. This suggests that infrared thermometers may require careful consideration as they can underestimate surface temperatures, potentially necessitating corrections to obtain heat flux values comparable to those from conventional heat flux sensors.

关键词： Heat-flux estimation Thermometric method Non-destructive test data post-processing Contactless approach

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Accurate post-processing of Spatially-Separated Antenna Measurements Realized in Non-Anechoic Environments 24th

Accurate Post-processing of Spatially-Separated Antenna Meas...

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24th International Conference on Computational Science (ICCS)

作者： Bekasiewicz, Adrian Waladi, Vorya Dhaene, Tom Czaplewski, Bartosz Gdansk Univ Technol Fac Elect Telecommun & Informat Narutowicza 11-12 PL-80233 Gdansk Poland Univ Ghent IMEC iGent Dept Informat Technol INTECIDLab Technol Pk Zwijnaarde 126 B-9052 Ghent Belgium

ISBN: (纸本)9783031637582;9783031637599

Antenna far-field performance is normally evaluated in expensive laboratories that maintain strict control over the propagation environment. Alternatively, the responses can be measured in non-anechoic conditions and then refined to extract the information on the structure field-related behavior. Here, a framework for correction of antenna measurements performed in non-anechoic test site has been proposed. The method involves automatic synchronization (in time-domain) of spatially separated measurements followed by their combination so as to augment the fraction of the signal that represents the antenna performance while suppressing the interferences. The method has been demonstrated based on six experiments performed in an office room. The performance improvement due to proposed post-processing amounts to 9.4 dB, which is represents up to over 5 dB improvement compared to the state-of-the-art methods.

关键词： data post-processing anechoic chamber antenna measurements non-anechoic experiments time-domain analysis

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Multitaper-Based post-processing of Compact Antenna Responses Obtained in Non-anechoic Conditions 24th

Multitaper-Based Post-processing of Compact Antenna Response...

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24th International Conference on Computational Science (ICCS)

作者： Dzwonkowski, Mariusz Bekasiewicz, Adrian Koziel, Slawomir Gdansk Univ Technol Fac Elect Telecommun & Informat Narutowicza 11-12 PL-80233 Gdansk Poland Med Univ Gdansk Fac Hlth Sci Dept Radiol Informat & Stat Tuwima 15 PL-80210 Gdansk Poland Reykjavik Univ Dept Engn Menntavegur 1 IS-102 Reykjavik Iceland

ISBN: (纸本)9783031637582;9783031637599

The process of developing antenna structures typically involves prototype measurements. While accurate validation of far-field performance can be performed in dedicated facilities like anechoic chambers, high cost of construction and maintenance might not justify their use for teaching, or low-budget research scenarios. Non-anechoic experiments provide a cost-effective alternative, however the performance metrics obtained in such conditions require appropriate correction. In this paper, we consider a multitaper approach for post-processing antenna far-field characteristicsmeasured in challenging, non-anechoic environments. The discussed algorithm enhances one-shot measurements to enable extraction of line-of-sight responses while attenuating interferences from multi-path propagation and the noise from external sources of electromagnetic radiation. The performance of the considered method has been demonstrated in uncontrolled conditions using a compact spline-based monopole. Furthermore, the approach has been favorably validated against the state-of-the-art techniques from the literature.

关键词： Antenna calibration data post-processing non-anechoic measurements radiation pattern multitaper

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Cross-Layer Resource Management for Downlink BF-NOMA-OFDMA Video Transmission Systems and Supervised/Unsupervised Learning Based Approach

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2022年第10期71卷 10744-10753页

作者： Tseng, Shu-Ming Chen, Guan-Ying Chan, Hsing-Chen Natl Taipei Univ Technol Dept Elect Engn Taipei 106 Taiwan Solid State Storage Technol Corp Taipei 114 Taiwan

Ali et al. proposed a physical (PHY) layer resource management for single-carrier N-antenna beamforming (BF) non-orthogonal multiple access (NOMA) systems. Cross PHY/application (APP) layer resource allocation and adaptive source encoding rate for single-antenna NOMA/ orthogonal frequency division multiple access (OFDMA) video communications was also recently proposed. These prior works did not deal with joint subcarrier/ BF cluster assignment in a cross-layer fashion. In this paper, we propose a joint adaptive source encoding rate and iterative cross-PHY/APP layer resource management for BF-NOMA-OFDMA video communications to support 2N users on one subcarrier and improves the average video quality peak-signal-to-noise ratio (PSNR). The proposed scheme outperforms Ali et al. PHY layer resource management by 4.18dB in the numerical results. Considering the high computational complexity of the iterative resource allocation, we further propose replacing the iterative cross-layer resource allocation by a supervised learning-based approach. We propose a novel and problem-specific post-processing procedure to guarantee the constraints that every user holds at least one subcarrier and a subcarrier support 2N users. The proposed supervised learning-based approach reduces the execution time by 98% in a GPU-based platform, comparable with 91-99% execution time reduction of supervised learning based communication algorithms in the literature, at the cost of 4% PSNR loss. Finally, we propose a supervised/unsupervised learning -based approach with minus PSNR as the cost function for continuous learning in an unsupervised learning fashion after supervised learning is done. The numerical results show that the proposed hybrid supervised/unsupervised learning approach can reduce the PSNR loss to just 1%.

关键词： Resource management NOMA Unsupervised learning Array signal processing Wireless communication Interference cancellation Indexes Non-orthogonal multiple access deep learning unsupervised learning loss function data post-processing cross layer design radio resource allocation multi-antenna beam- forming broadboad access developing countries

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Unraveling the complexity of pyrolysates from residual fuels by Py-GCxGC-FID/SCD/TOF-MS with an innovative data processing method

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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS 2023年 175卷

作者： Colleoni, Elia Samaras, Vasilios G. Guida, Paolo Frassoldati, Alessio Faravelli, Tiziano Roberts, William L. King Abdullah Univ Sci & Technol Clean Combust Res Ctr Thuwal 239556900 Saudi Arabia King Abdullah Univ Sci & Technol Analyt Chem Core Lab Thuwal 239556900 Saudi Arabia Politecn Milan Dept Chem Mat & Chem Engn G Natta Piazza L Da Vinci 32 Milan 20133 Italy

Residual fuels, often called 'bottom-of-the-barrel' are expected to play an important role in the transition towards a purely renewable energy market. Processes are required to upgrade such fuels and convert them into energy more cleanly and sustainably. To this goal, researchers aim to improve the understanding of their structure and reactivity. Given their complex nature and different chemical compositions, comprehensive two-dimensional gas chromatography (GCxGC) is well suited to provide a detailed characterization of the volatiles released during the pyrolysis of the residual fuels. This study reports a detailed characterization of pyrolysates released during the pyrolysis of two oil samples analyzed using a Py-GCxGC-FID/SCD/TOF-MS. The mass spectra generated with the electron impact ionization TOF-MS detection were used for species identification. An algorithm was developed and described here for the screening and post-processing of the detected peaks. Following algorithm postprocessing, the species identification confirms that this workflow is suitable for unraveling the complex nature of the complex mixture released during the pyrolysis of the oil samples. The algorithm results were verified using information from a flame ionization detector (FID) and a sulfur chemiluminescence detector (SCD), and the extraction of fragmentation patterns based on the literature. The chemical structure of pyrolysis products is described and classified into 26 molecular classes. The methodology presented in this work can be extended to other complex mixtures, such as bio-oils, plastics, and biomasses.

关键词： Residual fuels Py-GCxGC-FID/SCD/TOF-MS Detailed characterization data post-processing Pyrolysis

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Towards an improved thermometric method: Convective and radiative heat transfer for heat flux measurement through an indirect approach

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THERMAL SCIENCE AND ENGINEERING PROGRESS 2024年 49卷

作者： Evangelisti, Luca Barbaro, Leone De Cristo, Edoardo Guattari, Claudia D'Orazio, Tommaso Roma TRE Univ Dept Ind Elect & Mech Engn Via Vito Volterra 62 I-00146 Rome Italy Niccolo Cusano Univ Dept Engn Via Don Carlo Gnocchi 3 I-00166 Rome Italy Roma TRE Univ Dept Philosophy Commun & Performing Arts Via Ostiense 139 I-00154 Rome Italy

Actual thermal performance of building walls need to be assessed through on-site tests. Several measurement procedures have been proposed during the last decades. Nonetheless, among them the Thermometric (THM) method has been poorly explored in literature, hence opportunities for improvements can be highlighted. The THM technique is a quite a new and non-standardized procedure for wall thermal characterization, based on the well-known Newton's law of cooling. This law needs the heat transfer coefficient knowledge and there is no agreement about the value to apply when the THM method is used. In this work, a low-cost experimental apparatus characterized by a heated wooden sample was realized. Sensors were installed to measure heat fluxes through a common heat flux plate. The obtained values were compared with the heat flows achieved via the THM method, where dimensionless groups analysis was performed for computing suitable heat transfer coefficients obtained from data processing. The aim of this work is to lay the groundwork for overcoming the disagreement related to the value of the total heat transfer coefficient in the THM method by proposing and consolidating an alternative approach. The results show that the proposed data processing for the THM method can provide satisfying results in terms of indirect heat flux measurements, showing extremely low percentage differences (ranging from + 1.16 % to + 3.56 %) if compared with the HFM method.

关键词： Heat flux measurement Heat-flow meter Thermometric method Nondestructive test data post-processing

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Comparison of the Gaussian Wind Farm Model with Historical data of Three Offshore Wind Farms

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ENERGIES 2022年第6期15卷 1964-1964页

作者： Doekemeijer, Bart Matthijs Simley, Eric Fleming, Paul Natl Renewable Energy Lab Natl Wind Technol Ctr 19001 W 119th Ave Arvada CO 80007 USA

A recent expert elicitation showed that model validation remains one of the largest barriers for commercial wind farm control deployment. The Gaussian-shaped wake deficit model has grown in popularity in wind farm field experiments, yet its validation for larger farms and throughout annual operation remains limited. This article addresses this scientific gap, providing a model comparison of the Gaussian wind farm model with historical data of three offshore wind farms. The energy ratio is used to quantify the model's accuracy. We assume a fixed turbulence intensity of I-infinity = 6% and a standard deviation on the inflow wind direction of sigma(wd) = 3 degrees in our Gaussian model. First, we demonstrate the non-uniqueness issue of I-infinity, and sigma(wd), which display a waterbed effect when considering the energy ratios. Second, we show excellent agreement between the Gaussian model and historical data for most wind directions in the Offshore Windpark Egmond aan Zee (OWEZ) and Westermost Rough wind farms (36 and 35 wind turbines, respectively) and wind turbines on the outer edges of the Anholt wind farm (110 turbines). Turbines centrally positioned in the Anholt wind farm show larger model discrepancies, likely due to deep-array effects that are not captured in the model. A second source of discrepancy is hypothesized to be inflow heterogeneity. In future work, the Gaussian wind farm model will be adapted to address those weaknesses.

关键词： FLORIS model validation model comparison offshore wind wake steering SCADA historical data energy ratio data post-processing data analysis

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