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An enhanced performance scythe-shaped bending-torsion coupling wind energy harvester excited by magnetic force
IF 9 1区 工程技术
Energy Pub Date : 2025-03-18 DOI: 10.1016/j.energy.2025.135465
Chengwei Hou, Xiaobiao Shan, Xuteng Du, Yifeng Chen, Xiaofan Zhang, Tao Xie
{"title":"An enhanced performance scythe-shaped bending-torsion coupling wind energy harvester excited by magnetic force","authors":"Chengwei Hou,&nbsp;Xiaobiao Shan,&nbsp;Xuteng Du,&nbsp;Yifeng Chen,&nbsp;Xiaofan Zhang,&nbsp;Tao Xie","doi":"10.1016/j.energy.2025.135465","DOIUrl":"10.1016/j.energy.2025.135465","url":null,"abstract":"<div><div>Piezoelectric energy harvesters leveraging wind energy provide a solution for autonomous power in wireless electronic devices, driving advancements in wireless sensor networks and IoT technologies. This work presents a magnetic-excited scythe-shaped wind energy harvester (S-WEH) inspired by traditional scythes. The piezo oscillator comprises a vertical piezo beam and a horizontal auxiliary beam, mimicking the silhouette of a scythe. The motion of auxiliary beam impacts the piezo beam, inducing torsion during first-order vibration and bending during second-order vibration. Consequently, this work focuses on the influence of the auxiliary beam on the vibration response and power generation performance of the piezo beam. A combination of theoretical modelling and finite element analysis is employed to streamline the complex magnet-solid-electric multi-physics finite element calculations, with the method's validity and applicability validated through experimental results. Findings indicate that, with an auxiliary beam length, <em>L</em><sub><em>a</em></sub>, of 20 mm–50 mm, and a tip mass, <em>m</em><sub><em>a</em></sub>, of 8.4 g, increasing the length of auxiliary beam reduces the average voltage at the first-order resonance by 83.8 %, but boosts it at the second-order resonance by 166.1 %. Besides, at a wind speed of about 9 m/s, the S-WEH successfully transmitted temperature data to a mobile device after charging a Bluetooth temperature sensor for 5 s.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"321 ","pages":"Article 135465"},"PeriodicalIF":9.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Differential evolution-based mixture distribution models for wind energy potential assessment: A comparative study for coastal regions of China
IF 9 1区 工程技术
Energy Pub Date : 2025-03-18 DOI: 10.1016/j.energy.2025.135151
Jun Liu , Guojiang Xiong , Ponnuthurai Nagaratnam Suganthan
{"title":"Differential evolution-based mixture distribution models for wind energy potential assessment: A comparative study for coastal regions of China","authors":"Jun Liu ,&nbsp;Guojiang Xiong ,&nbsp;Ponnuthurai Nagaratnam Suganthan","doi":"10.1016/j.energy.2025.135151","DOIUrl":"10.1016/j.energy.2025.135151","url":null,"abstract":"<div><div>Mixture distributions generally have higher flexibility than single distributions in describing wind speeds. However, the determination of their components is critical. This work evaluates suitable distributions for the wind energy potential of ten sites along the coast of China. Firstly, ten single distributions are compared to obtain high-quality components for the construction of mixture distributions. Secondly, the best four single distributions are identified based on five goodness-of-fit indicators including root mean square error (<em>RMSE</em>), mean absolute error (<em>MAE</em>), chi-square test (<em>X</em><sup><em>2</em></sup>), coefficient of determination (<em>R</em><sup><em>2</em></sup>), and mean absolute percentage error (<em>MAPE</em>), and two-by-two combinations are made to construct ten mixture distributions. Finally, these twenty distributions are comprehensively compared and the wind power density is evaluated using the best distributions. In addition, differential evolution is applied to optimize the model parameters. The simulation results show that Burr, three-parameter Weibull, Nakagami, and two-parameter Weibull are the best four single distributions, while all the mixture distributions significantly outperform the single distributions consistently. This indicates that the mixture models have higher flexibility to capture the potential complexity in the wind speeds. In the wind power density calculations, all regions are over 200 W/m<sup>2</sup>, with Zhangzhou having the highest density and Haikou the lowest.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"321 ","pages":"Article 135151"},"PeriodicalIF":9.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of atmospheric stability on wind farm performance: Insights from internal boundary layer dynamics
IF 9 1区 工程技术
Energy Pub Date : 2025-03-18 DOI: 10.1016/j.energy.2025.135157
Yan Wang , Pan Lu , Yongze Zhou , Mingwei Ge , Rennian Li
{"title":"Impact of atmospheric stability on wind farm performance: Insights from internal boundary layer dynamics","authors":"Yan Wang ,&nbsp;Pan Lu ,&nbsp;Yongze Zhou ,&nbsp;Mingwei Ge ,&nbsp;Rennian Li","doi":"10.1016/j.energy.2025.135157","DOIUrl":"10.1016/j.energy.2025.135157","url":null,"abstract":"<div><div>The flow characteristics of the atmospheric boundary layer (ABL) and its interactions with wind farms are critical to assessing the aerodynamic performance of wind turbines. In this study, large eddy simulation (LES) was employed to investigate these interactions across different atmospheric stratifications, with a particular focus on the evolution of the internal boundary layer (IBL) and its effects on turbine wake characteristics and overall wind farm performance. The results indicate that the IBL evolves into distinct scenarios depending on the flow field characteristics, which substantially influence the mixing of turbine wakes with background turbulence, ultimately leading to significant sensitivity of wind farm performance to scale variations across different atmospheric stratifications. For wind farms with fewer than nine rows of turbines, power output progressively decreases as atmospheric stratification intensifies. However, once the number of turbine rows reaches ten, power output under stable stratification increases unexpectedly by 1.4% compared to neutral stratification. As the wind farm scale “expands” beyond ten rows, the difference in power output between stable and convective stratification diminishes and may even reverse, until the IBL reaches a fully-developed regime. These findings contribute to resolving the ongoing controversy regarding the effects of atmospheric stability on wind farm power generation.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"321 ","pages":"Article 135157"},"PeriodicalIF":9.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of zigzag tape on blade loads and aerodynamic wake in a vertical axis wind turbine: A Delft VAWT case study
IF 9 1区 工程技术
Energy Pub Date : 2025-03-18 DOI: 10.1016/j.energy.2025.135344
Krzysztof Rogowski , Jan Michna , Robert Flemming Mikkelsen , Carlos Simao Ferreira
{"title":"Impact of zigzag tape on blade loads and aerodynamic wake in a vertical axis wind turbine: A Delft VAWT case study","authors":"Krzysztof Rogowski ,&nbsp;Jan Michna ,&nbsp;Robert Flemming Mikkelsen ,&nbsp;Carlos Simao Ferreira","doi":"10.1016/j.energy.2025.135344","DOIUrl":"10.1016/j.energy.2025.135344","url":null,"abstract":"<div><div>This study investigates the impact of zigzag tape on the aerodynamic performance and wake characteristics of the Delft Vertical Axis Wind Turbine (VAWT). The primary aim is to understand how the zigzag tape affects blade loads and the resulting aerodynamic wake. A comprehensive analysis was conducted using the Actuator Line Model (ALM) with airfoil characteristics measured in the wind tunnel at the Technical University of Denmark (DTU). Additionally, a 2-D CFD analysis with <span><math><mrow><mi>k</mi><mtext>-</mtext><mi>ω</mi></mrow></math></span> SST and <span><math><mi>γ</mi></math></span>-Re<span><math><msub><mrow></mrow><mrow><mi>θ</mi></mrow></msub></math></span> turbulence models were employed to evaluate the influence of laminar transition phenomena on rotor characteristics. Results indicate that while the zigzag tape linearizes the lift coefficient characteristic, it leads to a notable reduction in aerodynamic efficiency due to increased drag and decreased lift below the critical angle of attack. The simulations were performed at a tip-speed ratio (TSR) of 4.5 to avoid a dynamic stall, as this operating condition ensures that the rotor blades remain below the static stall threshold and large offshore VAWTs are designed to operate near their maximum aerodynamic efficiency (<span><math><msub><mrow><mi>C</mi></mrow><mrow><mi>P</mi></mrow></msub></math></span>) for the majority of their operational time. The aerodynamic wake behind the rotor also shows significant changes, with the zigzag tape promoting asymmetry and affecting the wake recovery distance. The study’s findings highlight the importance of considering surface contamination effects, represented by zigzag tape, in evaluating VAWT performance and wake behavior, offering valuable insights for wind turbine design and optimization.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"321 ","pages":"Article 135344"},"PeriodicalIF":9.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Winter driving range optimization of electric bus based on CO2 thermal management system and thermal energy cascade utilization 基于二氧化碳热管理系统和热能级联利用的电动公交车冬季行驶里程优化
IF 9 1区 工程技术
Energy Pub Date : 2025-03-18 DOI: 10.1016/j.energy.2025.135668
Kaicheng He, Yulong Song, Hongsheng Xie, Feng Cao
{"title":"Winter driving range optimization of electric bus based on CO2 thermal management system and thermal energy cascade utilization","authors":"Kaicheng He,&nbsp;Yulong Song,&nbsp;Hongsheng Xie,&nbsp;Feng Cao","doi":"10.1016/j.energy.2025.135668","DOIUrl":"10.1016/j.energy.2025.135668","url":null,"abstract":"<div><div>Environmental pollution and the energy crisis are intensifying. Pure electric vehicles (EVs) are promising alternatives to traditional internal combustion engine vehicles (ICEVs), but a significant decrease in winter driving range challenges their adoption. This paper proposes an integrated CO<sub>2</sub> thermal management system with a waste heat recovery mode(WHR-CO<sub>2</sub> TMS) for buses, addressing cabin, motor, and battery thermal management. By harnessing motor waste heat and preheating the battery, we optimize winter driving range. The study compares four systems between −20 °C and −10 °C: PTC heating system, CO<sub>2</sub> heat pump system, WHR-CO<sub>2</sub> TMS, WHR-CO<sub>2</sub> TMS with battery preheating. Key findings include: a. Replacing PTC heating system with a CO<sub>2</sub> heat pump system increases driving range by 10.37 %–12.90 %. b. Motor waste heat recovery enhances CO<sub>2</sub> heat pump performance, increasing COP by 6.97 %–11.13 %, and improves driving range by 19.14 %–20.90 %. c. Preheating the battery reduces range decay by 8.73 %–13.26 %, leading to a range improvement of 19.47 %–21.60 % compared to PTC heating system. d. A scheme is proposed to adjust battery preheating based on driving distance and ambient temperature. The results highlight the potential of integrated TMS for enhancing the winter driving range of electric buses.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135668"},"PeriodicalIF":9.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sustainability ranking of straw resource utilization technologies: Life cycle assessment model based on IDEMATEL-IVIKOR
IF 9 1区 工程技术
Energy Pub Date : 2025-03-17 DOI: 10.1016/j.energy.2025.135683
Tianjiao Hou , Zhanwu Wang , Heng Wang , Guangyin Xu , Zhenfeng Wang
{"title":"Sustainability ranking of straw resource utilization technologies: Life cycle assessment model based on IDEMATEL-IVIKOR","authors":"Tianjiao Hou ,&nbsp;Zhanwu Wang ,&nbsp;Heng Wang ,&nbsp;Guangyin Xu ,&nbsp;Zhenfeng Wang","doi":"10.1016/j.energy.2025.135683","DOIUrl":"10.1016/j.energy.2025.135683","url":null,"abstract":"<div><div>Crop straws are utilized as fertilizer, animal feed, biofuels, industrial raw materials, and mushroom cultivation materials. Each method exhibits distinct technical features, and the difficulty in data acquisition makes it challenging for decision-makers to select the most sustainable technology. To comprehensively evaluate and prioritize straw utilization methods, an evaluation system consisting of 12 indicators of Technology-Economy-Society-Environment was constructed. The Life Cycle Sustainability Assessment (LCSA) method was used to evaluate these indicators. The Interval Decision Making Trial and Evaluation Laboratory (IDEMATEL) and the Interval VlseKriterijumska Optimizacija I Kompromisno Resenje (IVIKOR) were integrated to determine the weights of the indicators and to rank the technologies. The results show that the indicators with the highest interval weight values are net profit [0.119 0.263] and greenhouse gas emission reduction [0.097 0.219]. The comprehensive ranking result is fermented feed ≻ artificial board ≻ edible fungi ≻ direct combustion power generation ≻ crushed return to the field. The relative weights are 0.147, 0.173, 0.204, 0.236, and 0.241, respectively. Indirect returning methods such as manure, mushroom residue, and ash are more sustainable than direct returning. The results of the unidimensional ranking indicate that no single transformation pathway can maximize technical, economic, social, and environmental performance simultaneously. Sensitivity analysis further validates the robustness of the results, which can provide a reference for decision-makers to make appropriate choices based on needs and preferences.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135683"},"PeriodicalIF":9.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characteristics of ignition, combustion and emission formation of premixed ammonia-hydrogen blends by hydrogen-fueled pre-chamber turbulent jets
IF 9 1区 工程技术
Energy Pub Date : 2025-03-17 DOI: 10.1016/j.energy.2025.135573
Xinpeng Guo , Tie Li , Shuai Huang , Xinyi Zhou , Run Chen , Wenze Wei , Zehao Wu , Ning Wang , Shiyan Li
{"title":"Characteristics of ignition, combustion and emission formation of premixed ammonia-hydrogen blends by hydrogen-fueled pre-chamber turbulent jets","authors":"Xinpeng Guo ,&nbsp;Tie Li ,&nbsp;Shuai Huang ,&nbsp;Xinyi Zhou ,&nbsp;Run Chen ,&nbsp;Wenze Wei ,&nbsp;Zehao Wu ,&nbsp;Ning Wang ,&nbsp;Shiyan Li","doi":"10.1016/j.energy.2025.135573","DOIUrl":"10.1016/j.energy.2025.135573","url":null,"abstract":"<div><div>Ammonia combustion initiated by hydrogen-fueled pre-chamber jets is a prospective combustion concept for enhancing ammonia combustion. However, the related fundamental studies on the ignition, combustion, and emissions characteristics of various ammonia + hydrogen blends by hydrogen-fueled pre-chamber jets are still inadequate. In this work, the effects of various ammonia + hydrogen blends in the main chamber with the hydrogen volumetric blending ratio ranging from 0 % to 50 % and the orientations of the orifice, i.e., inclined and straight orifice, are optically studied by the double-pass Schlieren imaging. The results indicate that increasing the hydrogen blending ratio markedly enhances the ignition characteristics of the mixture, resulting in the identification of three distinct ignition modes: re-ignition, secondary jet ignition, and jet flame ignition. The combustion regimes shift from the broken reaction zone to thin reaction zone. Increasing the hydrogen blending ratio improves the ammonia combustion efficiency from 96.9 % to 98.6 %, significantly reducing the unburned ammonia emissions. A high proportion of blended hydrogen increases the NO<sub>x</sub> emissions, while both low and high blends cause the reduction of N<sub>2</sub>O emissions. Additionally, the presence of straight orifice enhances the combustion of the mixture, while its emission levels remain comparable to those of the nozzle featuring all inclined orifices.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"322 ","pages":"Article 135573"},"PeriodicalIF":9.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Understanding the impacts of inorganic species in woody biomass for preprocessing and pyrolysis–A review
IF 9 1区 工程技术
Energy Pub Date : 2025-03-17 DOI: 10.1016/j.energy.2025.135697
Ling Ding , Ming-Hsun Cheng , Yingqian Lin , Kuan-Ting Lin , Kenneth L. Sale , Ning Sun , Bryon S. Donohoe , Allison E. Ray , Chenlin Li
{"title":"Understanding the impacts of inorganic species in woody biomass for preprocessing and pyrolysis–A review","authors":"Ling Ding ,&nbsp;Ming-Hsun Cheng ,&nbsp;Yingqian Lin ,&nbsp;Kuan-Ting Lin ,&nbsp;Kenneth L. Sale ,&nbsp;Ning Sun ,&nbsp;Bryon S. Donohoe ,&nbsp;Allison E. Ray ,&nbsp;Chenlin Li","doi":"10.1016/j.energy.2025.135697","DOIUrl":"10.1016/j.energy.2025.135697","url":null,"abstract":"<div><div>Woody biomass represents an abundant resource for sustainable biofuels, biochemicals, and bioproducts. Technologies for converting woody biomass have been established for decades, and research consistently highlights the critical role of inorganic species and ash plays in feedstock handling and conversion processes, including equipment plugging, corrosion, and catalyst deactivation. A thorough understanding of the variability, transport behavior, and downstream impact of inorganic species in woody biomass is essential for defining feedstock quality specifications and developing effective management strategies for conversion processes. This review compiles critical information in five main sections: 1) inorganic species concentration in woody biomass, based on anatomical fractions and their sources of variability; 2) technique features for quantifying inorganic elemental chemical analysis; 3) impacts of inorganic species on biomass preprocessing; 4) impacts of inorganic species on pyrolysis, and 5) mitigation strategies. Additionally, this review explores future challenges and opportunities in addressing the impacts of inorganic species on biomass quality. These insights aim to support the sustainable development of the biomass-to-bioenergy pipeline and ensure high-quality lignocellulosic feedstocks for efficient downstream conversions. The findings offer valuable guidance to policy makers, industry stakeholders, and researchers in developing effective strategies for managing inorganic species in woody biomass and fostering the sustainable processes for lignocellulosic biorefineries.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"322 ","pages":"Article 135697"},"PeriodicalIF":9.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
KOH activation increased biochar's capacity to regulate electron transfer and promote methanogenesis
IF 9 1区 工程技术
Energy Pub Date : 2025-03-16 DOI: 10.1016/j.energy.2025.135650
Qing-Hua Liu , Yu-Hong Qiu , Zhi-Man Yang
{"title":"KOH activation increased biochar's capacity to regulate electron transfer and promote methanogenesis","authors":"Qing-Hua Liu ,&nbsp;Yu-Hong Qiu ,&nbsp;Zhi-Man Yang","doi":"10.1016/j.energy.2025.135650","DOIUrl":"10.1016/j.energy.2025.135650","url":null,"abstract":"<div><div>Accelerating direct interspecies electron transfer (DIET) between syntrophic partners can boost methanogenesis. Although biochar can promote DIET, low specific surface area (SSA) and electron transfer capacity (ETC) limit its application. KOH activation can improve SSA and ETC of biochar and its effectiveness in methanogenesis, yet the related methanogenic mechanism remains unclear, particularly for association between the KOH-activated biochar's properties and microbes. Herein, three biochars produced at 300, 500 and 800 °C were used to generate the corresponding KOH-activated biochars via a sequential carbonization and KOH activation procedure (CKAP) at 800 °C, which were labeled as CKAP300, CKAP500 and CKAP800, respectively. The effectiveness of KOH activation relied on the biochar type, exhibiting an increase of 92–1532 times in SSA and 11–22 % in graphitization degree. The KOH-activated biochar outperformed the pristine biochar in promoting methanogenesis, with a maximum increase of 75 % in methane yield and 3.1 times in maximum methane production rate (Rm). CKAP800 enhanced methane yield by 12 % and Rm by 29 % compared to CKAP300 and CKAP500, possibly due to the facts that high SSA facilitated the attachment and interaction of DIET partners (<em>Treponema</em> and <em>Methanosaeta</em>), and that high graphitization degree, c-type cytochrome and C-O groups promoted the DIET-based syntrophic metabolism.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"322 ","pages":"Article 135650"},"PeriodicalIF":9.0,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Expertise-guided NOx emission modeling of hybrid vehicle engines via peak-valley-enhanced Gaussian process regression
IF 9 1区 工程技术
Energy Pub Date : 2025-03-15 DOI: 10.1016/j.energy.2025.135166
Chengqing Wen , Ji Li , Bo Wang , Guoxiang Lu , Hongming Xu
{"title":"Expertise-guided NOx emission modeling of hybrid vehicle engines via peak-valley-enhanced Gaussian process regression","authors":"Chengqing Wen ,&nbsp;Ji Li ,&nbsp;Bo Wang ,&nbsp;Guoxiang Lu ,&nbsp;Hongming Xu","doi":"10.1016/j.energy.2025.135166","DOIUrl":"10.1016/j.energy.2025.135166","url":null,"abstract":"<div><div>In order to improve the characterization accuracy of NOx emission of hybrid vehicle engines, this paper proposes an expertise-guided NOx emissions modeling method of peak–valley-enhanced Gaussian process regression (PV-GPR) to precisely capture its mapping features. A K-nearest neighbors model is applied first to classify data based on engine operating conditions defined by the experts. Customized Gaussian process regression models are then developed for NOx emission under each condition. Each GPR model features a customized kernel function with identified peak and valley positions. All data was collected from an experimental test bench with a BYD gasoline engine for hybrid vehicles. The results show that using the proposed PV-GPR method achieves a lower RMSE (0.49), significantly outperforming the feedforward neural network (0.84) and cascade neural network (1.01). Gaussian kernel functions applied to NOx modeling in hybrid vehicle engines are designed, further extending the method’s applicability.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"322 ","pages":"Article 135166"},"PeriodicalIF":9.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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