bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the SCVM Flux Error MRAS Observer of Asynchronous Motor Based on SMC
Authors: Zhu Wenbai , Deng Xin , Hu Dan 
Published: November 2020

Abstract
Aiming at the sensorless control system of asynchronous motor, a MRAS observer method for asynchronous motor SCVM flux error based on sliding mode control (SMC) is proposed. This method uses the SCVM voltage model flux error to form a MRAS observer to identify the speed and estimate the rotor flux, and a sliding mode speed controller is designed to replace the traditional PI speed controller. The algorithm can reduce the overshoot of the dynamic response of the system speed at medium and high speeds, shorten the time to enter the steady state value, and enhance the robustness of the system. Simulation results show the effectiveness of the algorithm.
Transient Response Test System Based on FPGA
Authors: Xiao Zhang , Fang Zhao , Sang Deyi , Zong Fuqiang 
Published: November 2020

Abstract
A test system based on FPGA for second-order system transient response has been designed. The system uses the XC3S400 as the control core, and the VHDL hardware description language has been used to program FPGA to achieve the function of measuring the transient response parameters of the second-order system. The transient response waveform and the measurement result are displayed through VGA. The test results are within the error range, the overall index is good, and the curve storage and playback function are also implemented.
Study on the Optimization of Steam Turbine Exhaust Channel Based on Adding Diversion Device
Authors: Qiao Chunzhen , Zhu Chengfeng , Su Lanqing , Wan Kuifang 
Published: November 2020

Abstract
This paper studies the problems of high exhaust pressure and low economic efficiency caused by the uneven flow field at the exit of the steam turbine exhaust channel. This paper uses CFD simulation software to carry out numerical simulation on the steam turbine exhaust passage, and obtains a layout of the guide device that can greatly improve the uniformity of the flow field at the exit of the exhaust passage. This optimization scheme was applied to a domestic 600MW steam turbine unit for performance comparison and economic analysis before and after optimization. The results show that the average pressure of the condenser drops by about 0.704kPa. The coal consumption for power generation drops by about 0.525g/kWh. The annual standard coal saving is about 1729t. Therefore, installing a suitable diversion device can improve the operating efficiency of the unit, and has better economical efficiency and energy saving and emission reduction effects.
Research on Optimizing Method of High Speed Railway Passing Capacity Utilization
Authors: Naranbaatar S. , Jiang Jian 
Published: November 2020

Abstract
The mode of transportation organization adopted by China’s high-speed railways is the “transportation organization for trains running at different speeds”. The advantage of this model is that it facilitates the travel of travelers, reduces the time and energy wastage caused by the transfer, and improves the travel experience of passengers. However, this mode has many disadvantages and may not necessarily meet the passenger travel demand. Therefore, this paper focuses on how to use the idea of compressed operation diagrams to create an optimized model under the mode of “transport organizations with different speed-class trains collinearly operating”. Stop plan provides a reference.
Research on the Determination of Reasonable Cost Range of Power Grid Production Technological Transformation Project
Authors: Zhao Xin , Ni Tongyun , Miao Xujuan , Guo Lijuan 
Published: November 2020

Abstract
This paper proposed a method to determine the reasonable cost interval of power grid production technological transformation project based on Kernel Density Estimation (KDE). The general idea of the study of reasonable cost interval is to select sample data, determine the sample estimation method, remove the outlier data, and finally calculate the reasonable unit cost interval of power grid. The general idea of the study of reasonable cost interval is to select sample data, determine the sample estimation method, remove the outlier data, and finally calculate the reasonable unit cost interval of power grid technical transformation project. Taking the actual data of the disconnector replacement project as an example, this paper made statistics of the reasonable cost range of the power grid production technological transformation project, which provides a new idea and method for the reasonable determination of the cost range in the case of large amount of data.
Research on Yaw Deviation of Wind Turbine Based on Dynamic Time Warping
Authors: Xu Xinda , Hong Bin , Wei Yan , Wang Hao , Yin Xianlong , Wang Hao 
Published: November 2020

Abstract
The yaw deviation is common in the process of wind turbine generation. Excessive wind deviation will cause a series of problems, such as the reduction of wind turbine generating efficiency, the wear of main shaft, gearbox failure. In this paper, a wind deviation detection algorithm based on dynamic time warping is proposed by using data in supervisory control and data acquisition (SCADA) of wind turbine. Through dynamic time warping (DTW), the wind speed is divided into three sections: ascending, descending and stationary. Then the wind speed is divided into three sections, and the wind deviation is obtained by fitting the function of wind angle and power. Compared with the traditional algorithm, the wind deviation detection algorithm proposed in this paper is more stable and accurate.
Research on Benefit Analysis of CCHP-WSHP System in Vehicle to Building
Authors: Zhao Xin , Mu Hailin , Li Nan , Xue Zhaoquan , Yang Xiyue 
Published: November 2020

Abstract
This paper proposes a combined cooling, heating and power (CCHP) system, which comprehensively uses water source heat pump (WSHP) system and vehicle to build (V2B) mode. The CCHP-WSHP-V2B could efficiently solve the problems when a CCHP or a WSHP operates independently. And it can acquire better system performance. In this mode, the CCHP system can flexibly exchange electricity with electric buses and coordinate electricity demand. The water source heat pump can supplement the cooling load and heating load of the system. Furthermore, a case study based on a hotel building is established and studied to verify the effectiveness of the model. The results of the case study show that the primary energy saving ratio, carbon dioxide emission reduction ratio, and annual total cost saving ratio comparing with the separate production system are 36.09%, 43.06%, and 25.47%, respectively.
Optimal Design and Test Study on Sound Insulation Property of Exterior Wall Enclosure of Prefabricated Substation
Authors: Li Xiang , Mo Juan , Cai Hongjun , Liu Shouliang , Zhu Zhanwei , Jiang Zaixing , Ma Yuchao 
Published: November 2020

Abstract
In this paper, based on the fabricated wall panel used in original modular indoor substation, the optimal design of sound insulation property is conducted according to the relevant theoretical basis of sound insulation properties of wall panels, and the reverberation room method is used to test and study original and new wall panels. The study shows that the sound insulation of the sandwich panel after optimization has been greatly improved in both medium, low and high frequency areas, with obvious optimal design effect, and also there are significant engineering application value and social benefits in the noise control of substation.
High-precision Flux Linkage Observation of Induction Motor based on Spectral Decomposition Theory
Authors: Pan Yuedou , Zhang Weifeng 
Published: November 2020

Abstract
In the vector control system of induction motor, there is a delay in the switching device, which causes current distortion and motor performance degradation. Especially for high-power induction motors, the switching frequency of the inverter system is low, and the time delay effect is obvious. The mathematical model of magnetic flux observation of induction motors generally ignores the delay of the switching device. Therefore, the mathematical model is not accurate and the accuracy of the magnetic flux observation is not high. To address this problem, the mathematical model of the induction motor with delay is established, and the spectral decomposition flux linkage observer is designed to observe the rotor flux linkage in this paper. The designed spectral decomposition magnetic flux observer has the advantages of high magnetic flux observation accuracy. Simulation results prove the feasibility and effectiveness of the designed spectral decomposition flux observer.
Hydraulic Pitch Control Delay Estimation and Compensation Method for Large Wind Turbine
Authors: Wang Xiangming , Pan Jiahui 
Published: November 2020

Abstract
At present, using hydraulic pitch control for large wind turbines is becoming a trend. However, there will be a delay in the process of hydraulic pitch control, which will affect the stability of the system. In view of the influence caused by the delay in the wind turbine system, this paper designs a delay estimator and compensator using the Assumed Mode method, which linearizes the perturbation generated in the process of hydraulic pitch control and calculates the parameters with the method of function fitting, so as to overcome the adverse effect caused by the delay of hydraulic pitch control. At the same time, a pitch control system based on fuzzy control is designed to form a closed-loop control system. The parameters of 3MW wind turbine are taken as an example for simulation, the results show that this method can accurately estimate the delay generated in the process of pitch control, and can still well compensate the delay caused by the system under the condition of regulating pitch angle.
A Semantic Segmentation Method for Dam Leakage Detection Based on FCN
Authors: Zhang Jun , Yan Zhaohui , Ma Xinlong , Cai Xingguo 
Published: November 2020

Abstract
Leakage is an important factor affecting the safety of the dam. In the past, manual inspection is a significant way to monitor leakage risk. However, it is time-consuming, inefficient and difficult to quantitative evaluate such as the leakage area. A semantic segmentation method based on the fully convolutional network is proposed to replace the manual inspection for the dam leakage automatic detection. Thirty-eight high-resolution images of dam leakage are collected. FCN-8s and VGG16 backbone are adopted. The results indicated that the FCN-8s achieves the mIoU to 0.59 on the test set, which proves to be an efficient way to detect the dam leakage.
Calculation Method of Marine Ship Fuel Consumption
Authors: Li Jing , Jia Yuanming 
Published: November 2020

Abstract
Based on the current situation of fuel consumption management and technical measures of marine transportation ships in domestic shipping enterprises, this paper determined the calculation model of fuel consumption of marine transportation ships, and provided technical support for shipping enterprises to formulate energy consumption assessment index of single ship and realize fine management over energy consumption. It is verified by an example that the error of the calculation model is small.
Research on Highway Slope Monitoring Data Prediction Based on Long Short-term Memory Network
Authors: Zhang Jianbo , Peng Ting , Mo Linhai , Hu Xu , Wang Xiaoling 
Published: November 2020

Abstract
This paper first analyzes the basic structure and operation principle of Long Short-Term Memory Network (LSTM), and combines the characteristics of road slope monitoring data to determine the data form of the input layer and the type of activation function. Then, combined with the slope displacement monitoring data, a slope monitoring data prediction model based on LSTM is constructed, and the main structural parameters of the LSTM are optimized to predict the slope monitoring data. Finally, the data prediction results are analyzed, and the reliability of the prediction results is verified by analyzing the influence of the number of monitoring data samples on the prediction results.
Research on Certification Method of Greenhouse Gas Emission Reduction in Dry Bulk Cargo Terminal Horizontal Transportation Optimization Project
Authors: Li Jing , Zhou Yiying 
Published: November 2020

Abstract
In the process of dry bulk cargo terminal horizontal transportation, a large amount of greenhouse gas and pollutant emissions will be produced if the equipment which can consume liquid fossil fuel is used. This paper quantifies the calculation method of greenhouse gas emission reduction in dry bulk cargo terminal horizontal transportation process optimization project by comparing the research before and after the dry bulk cargo terminal horizontal transportation process optimization project, and provides technical support for such port projects to participate in carbon emission trading.
Numerical Study on Karst Treatment Technology of Wuhan Metro Line 6
Authors: Xu Hai-Qing , Xiao Cheng-Jing , Liu Wen-Li , Zuo Yong-Zhe , Wei Chao-Qun 
Published: November 2020

Abstract
Taking Wuhan Metro Line 6 karst crossing area as the research object, combined with on-site survey data, a reasonable karst treatment technical plan is proposed. The finite difference numerical calculation method was used to carry out numerical calculation research on the treatment effect of karst treatment technology in the study area. The research results show that after grouting reinforcement, the maximum settlement of tunnel segments is 19.5mm, which is 73% less than before reinforcement, and the treatment effect is better. The lining deformation is within the allowable deformation value after the reinforcement of the three rows of jet grouting piles. The maximum value of the stress of the jet grouting piles is lower than the design value of the shear strength of the high jetting walls, indicating that the treatment technology can play a good supporting role when completely collapsed Without destruction.
A Brief Analysis on Application of the Half Pavilion in Garden
Authors: Li Yuanyuan , Shen Shengling , Dong Chaoran , Lu Danni 
Published: November 2020

Abstract
The half pavilion exists as a special form of pavilion, and its application is the perfect interpretation of Chinese traditional philosophical thought of “harmony between the heaven and human” in the gardens, which is the crystallization of the wisdom of ancient people. In the Chinese classical gardens, the particularity of the half pavilion gives viewers a sense of experience with thousands of pavilions. Every scene and every half pavilion has a new experience and aesthetic feeling. In addition to its own aesthetic value, the external shape of the half pavilion is also of exploratory significance in its integration with the surrounding environment, showing its concept of adapting to local conditions, harmony between the heaven and man, and interacting with the surrounding environment. This paper studies the half pavilion preserved from ancient times in the Chinese gardens, and explores from the external characteristics of the half pavilion and spatial layout of the gardens. In terms of how to use it in the gardens, so as to find inspiration and provide new heuristics for modern designs.
Evaluation of Social and Economic Benefits of Demand Response
Authors: Zhang Gao , Xue Song , Zhang Xiaoxuan 
Published: November 2020

Abstract
The rapid development of demand response has realized the transformation of power system operation from isolated decision to interconnected communication, which is of great significance for improving power network flexibility, security and reliability. Also, by introducing demand response, power network investment for satisfying peak load could be delayed, while renewable energy consumption and power network economic operation could be promoted simultaneously. Based on the practice of demand response in China as well as to further encourage the application of demand response, this paper proposes a social and economic benefit evaluation model for demand response. Combined with the reality of China’s electric power system operation, social and economic benefits of demand response are scientifically evaluated. Also, capital requirements for China to promote the application of demand response is analysed and practical measures for demand response application are put forward.
The Influence of SLS Process Parameters on the Tensile Strength of PA2200 Powder
Authors: Hou Gaoyan , Zhu Hong , Xie Dan 
Published: November 2020

Abstract
In the process of selective laser sintering, the forming parameters will affect the dimensional accuracy and performance of the forming parts. At present, there is no reference standard for the optimal forming parameters of PA material. Aiming at this problem, the three factors of laser power, scanning pitch and scanning speed are analyzed, and the influence of the tensile strength of PA2200 material forming parts is analyzed. Through theoretical and experimental analysis, the optimal combination of process parameters is obtained by orthogonal experiment. The best combination of parameters is laser power 40W, scanning speed 3000mm/s, scanning pitch 0.4mm, and tensile strength up to 46.42MPa.
CFD Simulation of Single-phase Flow Characteristics and Pressure Drop in SiC Hollow-strut Foam Microchannel Reactors
Authors: Zhang Ye , Gao Yong , Yang Zhenming , Zhang Jinsong 
Published: November 2020

Abstract
Microchannel reactors (MCR) have received considerable attention by researchers in recent years. A novel hollow-strut ceramic foam microchannel reactor (HSCF-MCR) taking the material and structural advantages of SiC foam was proposed. The reactor could be used as a structural scaffold for continuous gas or liquid phase flow and reaction because all of its struts are hollow and interconnected with each other. The three-dimensional (3-D) microstructure of the SiC foam was characterized by SEM and micro-CT method. Based on the tetrakaidecahedron cell model, computational fluid dynamics (CFD) method was utilized to analyze the single-phase flow characteristics and pressure drop of HSCF-MCR. The 3-D interconnected structure can form the static mixing effect of the flow fields inside the foam microchannel and strengthen the mass transfer process. Both channel diameter D and cell size L of the foam play a vital role in the pressure drop gradient δ of the fluid flowing through HSCF-MCR. When the ratio of D to L is controlled as 0.1, δ is minimized. The CFD simulation results contribute to the structural optimization and energy saving of HSCF-MCR for its applications in the future.
Steam Turbine Performance Evaluation Based on Principal Component Analysis and Information Entropy
Authors: Lu Chengbin , Zhang Taiyan , Liu Xiaofeng , Yao Yongling , Chen Huagui 
Published: November 2020

Abstract
Information entropy and fuzzy analytical theory were combined and applied on the state assessment of power plant steam turbine unit. This method can be combined with the measured data of power plant, and made a comprehensive evaluation of the different working conditions. Fuzzy analysis of the original matrix can be a evaluation matrix, and the information entropy was introduced to solve the problem of calculating the weight of multi attribute factor set. Once the attribute weight is determined, the comprehensive evaluation value corresponding to the different working conditions can be defined and calculated. The results obtained by this method were compared with those obtained by the principal component analysis method. And the results obtained by information entropy method were objective and unique. The superiority of the method was verified. Under all conditions, the comprehensive evaluation value can be used as one index of the thermal archives as a benchmark for fault diagnosis, which provided a new idea and evaluation method for steam turbine fault diagnosis, and had a strong basic research and practical application value.
SNR enhancement for the second harmonics in fluxgate sensor
Authors: Zhang Chenhao , Zhang Yiming , Gao Junxia , Li Yunyun 
Published: November 2020

Abstract
The fluxgate sensor uses the nonlinear characteristics of soft magnetic materials to measure the geostationary magnetic field, which has the characteristics of high sensitivity, wide magnetic measurement range and easy portability, and is widely used in geological exploration, navigation, space technology and other fields. In this paper, the research is based on the second harmonic method of the development of fluxgate sensor, since the second harmonic contains static magnetic field direction and amplitude information, so the second harmonic signal to noise ratio enhancement can effectively improve the resolution of the fluxgate sensor. In this paper, the induction signal is first resonated to the second harmonic frequency using a resonant circuit, and then filtered after an amplification circuit, the second harmonic signal-to-noise ratio is significantly enhanced by 13 times.
Finite Element Analysis and Experimental Verification on Joint with CFST Columns and Unequal Height Steel Beams
Authors: Ji Jing , Zeng Wen , Xu Ming , Li Zhihui , Jiang Liangqin 
Published: November 2020

Abstract
In order to study the mechanical properties of joints with CFST columns and unequal height steel beams, based on the simplified mechanical model and reasonable material constitutive model, the finite element model of this kind of joints is established by using ABAQUS finite element software, and four joints are simulated and analyzed and the load-displacement hysteretic curves and skeleton curves of the specimens are obtained. The results show that the hysteretic curves of this kind of joints are relatively full, and it has strong energy consumption capacity. Comparing the simulated hysteretic and skeleton curves with the existing test results, the two are in good agreement, which verifies the rationality and feasibility of the finite element modelling. Finally, the seismic strengthening measures of this kind of joint are given, which lays the foundation for the subsequent research on the seismic performance of the frame with this kind of joint.
Quantum Chemistry Study on Scale and Corrosion Inhibition Performance of Polyaspartic Acid
Authors: Cheng Yushan , Chen Min , Xiao Ju , Xing Naihao , Huang Changshan 
Published: November 2020

Abstract
The corrosion and scale inhibitions performance of polyaspartic acid (PASP) was invesgated based on the quantum chemistry calculation method of semi-empirical method by using the software of GaussView 6 and Gaussian 16.The calculation results show that, for scale inhibition, as the nitrogen atoms of PASP molecules and the oxygen atoms in carboxyl group were electronegative, which caused the electrostatic interaction to happen easily between the oxygen ions of carboxyl and the calciumions on the calcite surface, in addition, the space between the two nitrogen, oxygen ions in PASP molecule was exactly matched the space between the calcium ions on the calcite surface, the adsorption effect of the scale inhibitor to the calcite surface was obviously improved, thereby, the aim that inhibiting CaCO3 scale was achieved, the calculation results were in accordance with the test results. For corrosion inhibition performance, the HOMO energy, the LUMO energy and the difference of the two values was gotten through the calculation. The results were coincident with the mechanism description, and the calculation results were consistent with the test results.