bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the deviation of outlet air velocity of powder feeding duct in power plant based on sudden tube expansion
Authors: Sun Kang , Cheng Zhihai , Lou Zhongfa , Wang Zhiwu 
Published: September 2024

Abstract
The existence of the deviation of the outlet air velocity of the powder feeding pipeline in a power plant affects the depth of the primary air injection and the degree of diffusion of the combustion flame, leading to the skewed combustion flame. It affects the ignition and steady combustion of pulverized fuel in the boiler chamber, leading to the slagging of the locally heated surface, and thus affecting the safety and flexibility of the boiler operation. In this paper, taking the powder-feeding pipelines corresponding to six coal mills in the direct-blowing pulverizing system of a power plant as the research object, numerical simulation technology is used to study the influence of the addition of a sudden expanding pipe on the deviation of the outlet wind speed of the powder feeding pipeline. Numerical simulation results show that the installation of a surge pipe in the horizontal straight section of the powder feed pipe with a large outlet wind speed can effectively reduce the outlet wind speed of the powder feed pipe, which in turn reduces the deviation of the outlet wind speed of each powder feed pipe. After the installation of the surge pipe, the maximum deviation of the wind speed of the powder feed pipe is reduced from 1.15 to 1.07.
Simulation analysis of the influence law of high-voltage discharge-breaking rock
Authors: Na Xueshuo , Li Hongda , Zheng Haowen 
Published: September 2024

Abstract
In order to study the influence of the high-voltage discharge rock-breaking process, in this paper, the simulation model of needle electrode structure is established by COMSOL simulation software, simulating the distribution of the electric field strength by different rocks under the factors of voltage, electrode spacing, and insulating medium. The results show that the larger the permittivity of the rock, the larger the field strength inside the rock; the strength of the electric field inside the rock increases linearly with increasing voltage; the strength of the rock’s electric field gradually decreases as the electrode spacing increases; the insulating medium affects the efficiency of the rock breaking, and the smaller the permittivity is, the easier the rock is to be broken through.
Lithium battery SOH prediction based on multi-indicator optimal weight fusion
Authors: Yan Xi , Li Qi , Yan Ran 
Published: September 2024

Abstract
To improve the prediction accuracy of battery health state, this study proposes a prediction method combining health indicator polynomial (HIP) and Improved Grasshopper Optimization Algorithm (IGOA). Based on Support Vector Regression (SVR), three representative health indicators (HI) were selected, and a polynomial model integrating multiple HI was constructed by using weighted fusion. Considering that the value of the weight coefficient of the feature, the penalty coefficient of SVR and the kernel parameter have a great influence on the prediction accuracy, the improved grasshopper optimization algorithm is used to jointly optimize the weight coefficient and related hyperparameters in the model. The simulation results on the University of Maryland battery data set show that the proposed prediction method has higher prediction accuracy, and the prediction error is basically maintained within 0.03.
Design and analysis of inertial fatigue loading device for bidirectional wind turbine blades
Authors: Liu Weicheng , Liao Gaohua , Lai Guibing 
Published: September 2024

Abstract
In order to improve testing efficiency and reduce testing costs, the two-degree-of-freedom (two-DOF) fatigue loading is an effective testing method for wind turbine blades. An electrically driven inertial excitation device based on a crank-slider structure was designed, and the energy method was used to calculate the energy consumption and power parameters to construct a bidirectional resonance-type wind turbine blade fatigue test system. The LaGrange’s Equation method was used to establish the dynamic model of bidirectional fatigue loading of wind blade, and combined with the equation of state of the three-phase permanent magnet synchronous motor in the d-q coordinate system, the electromechanical coupling equations of the system were jointly constructed. The simulation model was established by using MATLAB software to carry out the numerical simulation analysis, and the fundamental law of the system’s coupled vibration process was obtained, offering insights into the design of the blade fatigue test system and control algorithm.
Substation secondary equipment fault detection based on the Llama2 model
Authors: Zhang Haili , Mu Juntao , Li Yongbin , Wang Xin , Chen Bin , Cui Min 
Published: September 2024

Abstract
In the field of power systems, this paper proposes a novel method to detect and diagnose faults in secondary equipment in substations. Using the latest large-scale language model Llama2, a deep learning analysis of online monitoring information of substation secondary equipment was carried out to automatically detect and classify potential faults. The powerful semantic understanding and text analysis capabilities of the Llama2 model enable us to learn and identify failure modes from a large amount of historical data. When data annotation is limited, self-supervised learning technology is used to enable the model to learn and extract valuable features for fault detection from unlabeled data. Through a series of experiments and comparative analysis, our method not only improves the accuracy of fault detection but also reduces false alarms.
Transmission line fault diagnosis based on SENet-ResNext-LSTM
Authors: Li Ge , Tang Di , Tang Shun 
Published: September 2024

Abstract
A proposed model for diagnosing faults in transmission lines, integrating attention mechanisms, the ResNext network, and the Long Short-Term Memory (LSTM) network addresses issues such as diminished precision, constrained adaptability, and reliance on conventional manual fault detection methods. Initially, waveforms captured from transmission line faults undergo wavelet transformation filtration. These waveforms are subsequently partitioned into two segments for feature extraction. One segment undergoes processing by the ResNext module, equipped with an attention mechanism, thereby reducing computational complexity. In contrast, the other segment is input to the LSTM network to ascertain the dependence on fault data sequences. Ultimately, features derived from both branches are combined and input to the Softmax layer for fault classification. Experimental results indicate that our proposed approach surpasses existing deep learning methods in accuracy metrics for diagnosing faults in transmission lines.
ANSYS Simulation-based analysis of cable insulation faults
Authors: Wan Qingzhu , Min Xianjuan 
Published: September 2024

Abstract
Insulation degradation of cables is the core factor of its shortened life, and the current operation and inspection departments are unable to effectively analyse cable insulation defects from multiple perspectives. To address this problem, ANSYS simulation was used to extract the characterization of cable insulation faults. Firstly, the fundamentals of defective insulation in cables were introduced. Then, a finite element model of a 10kV Cross-Linked Polyethylene (XLPE) cable was established by using ANSYS simulation software. Finally, simulations and analyses of bubbles, bulges, and cable insulation exhibiting water-tree defects were carried out to derive changes in the cable’s magnetic field strength due to different defects. The results indicate that as the degree of cable insulation defects continues to increase, the cable’s magnetic field strength also undergoes distortion.
Non-intrusive load monitoring based on equipment operation state
Authors: Zhang Xiao , Cheng Sijin , Wang Yi , Wang Shenzheng , Li Xinyi , Gu Yang 
Published: September 2024

Abstract
Energy disaggregation, known as Non-Intrusive Load Monitoring (NILM), is a practical approach to providing device-level electrical information and can be applied to enhance various scenarios in smart grids. In recent years, with the emergence of large-scale energy consumption datasets, a growing multitude of deep learning methods have been employed to address energy disaggregation problems. However, these methods face challenges in resolving the disaggregation of multi-state devices and devices with overlapping operation cycles, especially during startup and shutdown periods. This paper addresses these challenges by proposing a load disaggregation framework based on equipment operation state. Diverging from existing methods, the load disaggregation task in this paper is divided into two stages. The first stage primarily employs load recognition methods to detect and identify the state transition information of the target appliance. The second stage, based on the identified information from target appliance events, utilizes power filling and power correction methods to achieve load disaggregation. Additionally, a data augmentation method is introduced to alleviate the issue of insufficient sample quantity in the dataset, which hinders model training. Experimental comparisons are conducted on widely used public datasets in the NILM field, namely REDD, and UKDALE, against various state-of-the-art methods. The proposed method achieves an average Mean Absolute Error (MAE) of 3.331 for disaggregating multiple appliances, reducing approximately 38% compared to existing methods. These results robustly validate the advancement of the proposed approach in this paper.
Simulation analysis on the influence of airflow channel shape on the thermal storage and release performance of solid heat storage device
Authors: Chen Mengdong , Kang Wei , Tan Hui , Deng Zhanfeng , Lv Hongkun , Ding Liwei , Guo Xutao 
Published: September 2024

Abstract
A simulation analysis of the effect of airflow channel shape on the heat storage and release performance of solid heat storage devices was conducted. A mathematical model for a heat storage device with thermal energy bricks and circular and elliptical holes as airflow channels were developed, and the model’s correctness was verified. Results showed that when the cross-sectional area was the same, the heat transfer performance of bricks with circular holes was 20% lower than that of bricks with elliptical holes. The direction of the elliptical hole had no effect on heat transfer performance. The structure of the flow channel shape affected the distribution of air mass flow rate, which would further affect the heat storage and release performance of the heat storage device.
Simulation study of modular independent cooling systems for servers
Authors: Jia Deyi , He Wei , Xu Chenchen , Guo Tao 
Published: September 2024

Abstract
With the development of information technology, IT equipment within data centers is becoming increasingly dense, leading to a continuous increase in heat flux density. In order to significantly enhance the cooling efficiency of servers, this study proposes a server-level modular independent cooling system, which integrates the cooling system’s end devices completely within the servers. Compared to traditional room-level air conditioning cooling schemes, this approach avoids unnecessary cooling during the cooling transfer process, thereby improving energy usage efficiency and data center space utilization. Additionally, it allows for independent adjustment based on the actual load and temperature requirements of each server. This research provides new insights for optimizing server design.
Research on large-scale microchannel heat exchangers in domestic heat pump air conditioning applications
Authors: Dou Jie , Wen Xueying 
Published: September 2024

Abstract
Air source heat pumps are widely used and indispensable in the field of household air conditioning. However, in the low-temperature environment of northern regions in winter, the problem of frosting on heat exchangers is more severe, which restricts the development of the entire heat pump market in the north. This article conducts a simulation study on large-sized microchannel heat exchangers that can be applied to household air source heat pump air conditioners, establishes corresponding three-dimensional models of fins and heat exchange tubes, simulates the frosting situation around the louvered vertical fin and heat exchange tubes under different temperatures and wind speeds, and draws corresponding conclusions based on the simulation results. This provides a basis for further optimizing and improving microchannel heat exchangers and further supports the expansion of the use of household air source heat pump air conditioners.
Simulation application of support vector machine feedforward control in gas turbine load control
Authors: Li Da , Zhang Jian , Zhuang Yifei , Zhen Cheng , Zhang Jiawei 
Published: September 2024

Abstract
To address the challenges of excessive overshoot, prolonged settling time, and complex PID parameter tuning in gas turbine load control, this study investigates a gas turbine load control system utilizing support vector machine feedforward control. Firstly, the load control loop is decomposed, and the existing model structure is integrated with the load control section. Subsequently, the gas turbine load loop is modeled based on field test data. Following this, a gas turbine load control system incorporating a support vector machine feedforward loop is constructed in the MATLAB/Simulink environment. Finally, the entire loop undergoes simulation experiments. The simulation results demonstrate that the system exhibits rapid response to load step changes, enhances the stability of the load control loop, and effectively fulfills the requirements of grid-source coordination in modern power systems.
Simulation study of a flue gas waste heat and water co-recovery system
Authors: Deng Yu 
Published: September 2024

Abstract
To improve the economy and safety of the power plant, the waste heat and water co-recovery system with two-stage flue gas coolers (FGC) was put forward. Two-stage FGCs were equipped between the induced draft fan (IDF) and the wet limestone flue gas desulfurization (WFGD), the WFGD and the wet stack. To ensure safety, Each stage flue gas cooler consisted of two independent heat exchangers (hot end heat exchanger named FGC-H, cold end heat exchanger named FGC-C) with a coupling fluid which is circulated by a pump, and this method named fluid coupled indirect heat exchange (FCHE) technology. Due to the temperature of flue gas through two FGC-Hs being below the acid and/or water vapor dew points, two FGC-Hs adopted the plastic heat exchanger to prevent the sulfur attack. Then, the impact of the waste heat and water co-recovery system on the dynamic behavior and the economic performance of the studied power plant have been verified by simulation tests on the full-scale simulator of the studied 330 MW coal-fired power plant. The results show that the waste heat and water co-recovery system could effectively improve the economy and environmental performance of the studied power plant. It is an effective way to realize further flue gas waste heat utilization.
Research on reserve auxiliary service clearance models based on elastic price curves
Authors: Chen Mingyuan , Li Ling , Zheng Wenbin , Liang Yanjie , He Yini , Fang Xuelian , Xuan Peizheng , Cheng Lanfen , Peng Chaoyi 
Published: September 2024

Abstract
When there is a large forecast error or a sudden change in the power system load, there will be a significant power generation gap, which needs to be supported by reserve auxiliary services to ensure power balance. Meanwhile, with the gradual increase of renewable energy penetration rate, reserve auxiliary services can also be used to cope with the variability and intermittency of renewable generation. Therefore, the significance of reserve auxiliary services for the security and stability of the grid operation is increasingly prominent. For reserve ancillary services, this study aims to propose three clearance models based on the elastic price curves, compare their clearance mechanisms, and analyze their advantages and disadvantages by using an example simulation with Matlab. Simultaneously, applicability analysis is conducted to assess the applicability of these models to different power market development scenarios. The results of this study contribute to the understanding of the clearance mechanisms of reserve auxiliary services and provide a reference for the construction and decision-making of power markets.
Experimental study on flexible PV/T system under different working conditions
Authors: Wang Jikai , Zhu Qunzhi 
Published: September 2024

Abstract
In the overall life cycle energy consumption of China’s construction sector, building energy usage constitutes a significant portion, and the process of China’s dual carbon goals can be greatly accelerated by reducing building operation energy consumption. Solar energy, as a kind of renewable energy, is increasingly mature in construction applications. PV/T comprehensive utilization technology has attracted much attention in using solar energy. The flexible PV/T system can fit on the facade of various bending angles. This paper conducts indoor variable working conditions (irradiance and volume flow) and flexible PV/T and flexible PV contrast experiments on the existing flexible PV/T system. Observations reveal a direct correlation between irradiance, volume flow rate, electric power enhancement, and thermal efficiency in the flexible PV/T system. Flexible PV/T systems can produce more electricity than flexible PV systems at the same irradiance.
Air energy heating system for crude oil based on photovoltaic green electricity
Authors: Liu Shizhen , Liu Cheng , Xu Zengjin , Zheng Haixin , Miao Wenhao , Zhang Shennan 
Published: September 2024

Abstract
In the traditional oil production process, the crude oil and oil-water mixture extracted from the wellhead need to be heated before being transported to the combined station to reduce the system’s resistance loss along the way, and the heating is usually carried out by natural gas and gas furnaces. To achieve the double carbon goal of energy 3060 in China, this paper proposes the solution of heating crude oil with a photovoltaic green electric air heat source pump: When there is light, the photovoltaic provides green electricity to the air heat source pump for heating crude oil; When there is no green electricity, the original natural gas heating furnace is automatically started to supplement the lack of green electricity. The program not only reduces the consumption of petrochemical energy and environmental pollution, but also makes full use of the renewable energy of solar energy and gives full play to the energy-saving effect of air heat source pumps. The scheme has been demonstrated in part of the oil production field in Qinghai Oilfield, and shortly, with the continuous advancement of the solar thermal project, the crude oil heating system will achieve full coverage of green electricity.
Impact of Environmental Conditions on the Preservation of Ageing Traditional Oil Paints on Wood Surfaces
Authors: Zárybnická L , Machová D , Dvořák L , Baar J , Mácová P , Kloiber M 
Published: September 2024

AbstractSurface weathering of wood is the degradation progressive change of the outer layer over time due to exposure to environmental conditions. Traditional oil paints offer several advantages when used on exterior wood surfaces - good durability, smooth finish, moisture resistance, excellent coverage, and gloss. Oil paints have a long history of protecting exterior wood surfaces, potentially lasting 50 to 100 years with minimal maintenance. One negative effect of this traditional finish is surface oxidation. As part of the study, paints were applied to the surface of the wood either in one layer (lazure) or in multiple layers (opaque). The properties of the substrate also affect the resulting quality and durability. Therefore, another sorting element was included in the study: the type of wood processing (machine vs. handmade). The work aimed to compare the durability of prepared oil paints on a wooden surface. The prepared samples were exposed to weather conditions corresponding to the Central European climate for 6 years. The samples were then analysed for chemical changes using Fourier transform infrared spectroscopy (FTIR), water contact angle determination and digital optical microscopy to preserve the paint layer. Multi-layer painted wood showed minimal colour changes even after 6 years, but the influence of the processing method of the wood itself could not be demonstrated.
Experimental Investigation on Properties of Sugarcane Bagasse Fiberboard Manufactured with Different Techniques
Authors: Nabil Guirguis Marianne , Khalaf Omar , Micheal Amany 
Published: September 2024

Abstract
Within an ongoing research project investigating the use of sugarcane bagasse (SCB) to develop different building materials, this article adopts an experimental approach to determine the effect of the manufacturing technique on proposed composite fiberboards. Two different prototypes of composite fiberboards are developed using (SCB) as a natural fiber, and different matrices are tested. The epoxy resin and polyester resin are used as the alternative matrices. Fiberboards are proposed to be used as cladding boards or as internal furnishing units material instead of using MDF or HDF that exploit the usage of natural soft or hard wood that is unrecyclable, thus depleting the natural resources of our world. Different research articles tackle the characterization of various physical or mechanical properties of such natural fiber/synthetic matrix composites. However, this research focuses on the effect of the manufacturing technique on the various properties of relevance in accordance with the proposed function and use of the developed materials. The study parameters are the fiber size grading and the manufacturing processes. Two different manufacturing techniques are adopted; the press mold, and the vacuum infusion, to reach a maximum fiber volume fraction, good surface condition, and fewer voids. The developed panels are tested to determine the impact of the above-mentioned parameters on the physical and mechanical properties, and hence, a preliminary attempt to bridge the gap between research and industry is presented. Results show that the best strength results for tensile and bending strengths are for specimens made from fine fibers, epoxy matrix, and vacuum infusion technique.
1.3 μm higher order LP11 mode pulses in praseodymium-doped fluoride fiber laser
Authors: Ahmad Harith , Nizamani Bilal 
Published: September 2024

Abstract
This work demonstrated an LP11 mode pulse laser at O-band using praseodymium-doped fluoride fiber as a gain medium. The Q-switched laser was initially generated using antinomy-telluride/polyvinyl-alcohol (Sb2Te3/PVA) thin film, and the LP11 modes were analyzed using a beam profiler. The pulse laser was achieved at a pumped power of 273–303 mW. With the increase in pump power, the pulse repetition rate increased to a maximum of 60.2 kHz, and the pulse width decreased to a minimum of 2.86 μs. The operating wavelength of the Q-switched output was 1303.2 nm. The corresponding pulse energy and peak power also increased with the increase in pump powers to the maximum of 12.12 nJ and 4.24 mW. The higher-order modes were obtained after the fiber was offset between the single-mode fiber and the two-mode fiber (TMF). The TMF output was then connected to the multimode fiber, a collimator, and the scanning-slit optical beam profiler to observe the higher-order modes. A uniform two-lobe structure of higher-order LP11 modes was observed.