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Application of Comprehensive Geophysical Exploration Method in Leakage Detection of Levee Liu Jin-peng, Wang Zhi-hao, Tang Ke-xuan, Zhang Mei-duo, Liu Kang-he Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 1-7.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.001 Abstract （195）      PDF（pc） （596KB）（422）       Knowledge map    Save Geophysical detection method is an effective method for non-destructive testing of levees, but each geophysical detection method measures a single physical parameter, such as resistivity value, potential value, seismic wave velocity and so on. There are limitations and multiple solutions in geological interpretation when using a single parameter. This paper introduces the basic principles, advantages and disadvantages of common used geophysical detection methods for hidden dangers of levees, and discusses the application of comprehensive geophysical methods in identifying hidden dangers of levees leakage through engineering examples, which can be used as a reference for similar projects. Reference | Related Articles | Metrics | Comments（0）

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Fuzzy Fault Tree Analysis Method for Dam Failure Probability HUANG Meng-jing Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 8-13.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.002 Abstract （171）      PDF（pc） （321KB）（277）       Knowledge map    Save In order to quantitatively analyze the probability of dam failure and provide decision-making basis for dam risk analysis and evaluation, this paper integrates fuzzy set theory into the fault tree analysis method, studies the fuzzy fault tree analysis method of dam failure probability, specifically analyzes the traditional fault tree analysis method, fuzzy set theory, triangular fuzzy number method, and basic event probability determination method, clarifies the analysis process of the fuzzy fault tree analysis method of dam failure probability,and analyzes the dam failure mode.Finally, taking the calculation of the failure probability of an earth-rock dam as an example, the causes of the dam failure were analyzed in depth, and the top event, intermediate event, and basic event were identified. A fuzzy fault tree analysis model for the dam was established, and the probability of each basic event was triangulated and normalized. The comprehensive determination of the dam failure probability can provide a reference for the next step of risk assessment. Reference | Related Articles | Metrics | Comments（0）

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Discussion on the Technology and Safety Protection Measures of Hanging Basket Construction Across Freeways JIN Da-zhi, LU Cheng-ming, LU Nan Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 53-57.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.010 Abstract （201）      PDF（pc） （411KB）（197）       Knowledge map    Save In the construction of highway bridges, the hanging basket construction technology has been widely used, but in some special geographical environments, this method still needs to overcome various difficulties and challenges. This article provides a detailed introduction to the design scheme, installation steps, and construction process of the hanging basket for an overpass highway bridge construction case, and explores the safety protection measures during the construction of the overpass highway. The results indicate that during the construction of the cross highway range, protective brackets and protective nets are used to seal the mid span hanging basket. At the same time, a bottom protection platform is set under the main body of the hanging basket, which can effectively prevent scattered materials such as steel reinforcement heads, bolts and nuts, mortar, welding electrodes, welding sparks, small tools, etc. from falling into the traffic lane and prevent high-speed traffic safety accidents. By exploring the construction process and safety protection measures of hanging baskets in this article, solutions and ideas are provided for similar engineering project construction difficulties. Reference | Related Articles | Metrics | Comments（0）

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Energy Audit and Energy Conservation Potential Analysis of a Government Agency in Hebei Province YIN Ziyang, XIAN Xiaodong, YAN Lichuan, HOU Nana, MA Kunru Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 36-43.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.007 Abstract （78）      PDF（pc） （871KB）（149）       Knowledge map    Save China is currently the world's largest energy consumer, with a significant proportion of carbon emissions in the construction industry. In order to promote energy conservation and consumption reduction in existing buildings, China has explicitly required government agencies and other public institutions at all levels to monitor energy consumption in real-time. In order to investigate the use of energy resources by government agencies, achieve scientific, rational, and efficient energy use, improve energy utilization efficiency, and reduce energy waste, an energy audit method was adopted to analyze the energy consumption structure and consumption indicators of a government agency in Hebei Province, comprehensively understand the use of energy resources, tap into energy-saving potential, and propose rational energy-saving suggestions to achieve the goal of strengthening energy management and improving energy efficiency, providing reference for similar public institutions in energy auditing and energy-saving renovation. Reference | Related Articles | Metrics | Comments（0）

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Dynamic Response Analysis of Continuous Beam Bridges Based on Lateral Collision Effect CHEN Kanglong Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 11-16.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.003 Abstract （57）      PDF（pc） （1036KB）（145）       Knowledge map    Save The study of beam dynamic response is an important branch in the field of bridge engineering, especially when considering lateral collision effects. In order to study the effect of lateral collision on the dynamic response of continuous beam bridges, an open system for earthquake engineering simulation (OpenSees) finite element software was used to build a finite element model of the entire bridge. The dynamic response and vulnerability changes of the bridge were compared and analyzed with and without lateral collision. The results show that when the peak ground acceleration is 1.0 gal, the probability of minor and complete damage to the support is 0.97 and 0.71, respectively, without lateral collision, and 0.92 and 0.65, respectively, with lateral collision. The lateral collision effect limits the relative displacement of the support through the limiting effect of the stopper, thereby reducing the probability of damage. This has practical guidance significance for the evaluation, reinforcement, and maintenance of bridges in seismic design. Reference | Related Articles | Metrics | Comments（0）

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Design and Implementation of Self-study Room Platform Based on Springboot and Uni-app Framework LI Jinzhong, HU Zhiming, CHEN Jiangang, CHEN Hanxuan, ZUO Zuo Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (2): 77-82.   DOI: 10.16046/j.cnki.issn2096-5680.2024.02.014 Abstract （529）      PDF（pc） （551KB）（126）       Knowledge map    Save At present, domestic education has begun to popularize online learning mode on a large scale. However, many existing online learning platforms gradually appear the problem of excessive entertainment and social seriousness, which seriously violatesthe original intention of the birth of online learning platforms. In addition, the platform has relatively limited functions, making it difficult to comprehensively manage the learning status of users, and there is also a considerable shortage of products on the market that meet users'needs. Therefore, this paper designs and develops a mobile self-study room platform based on SpringBoot and Uni-App frameworks, which is specially designed to provide users with learning state management services. The main functions of the platform include five functional modules: self-study state management, learning dynamic management, leaderboard, notepad, and user information management. The platform can provide users with a series of learning state management services to help them develop a good learning self-control, cultivate students' independent learning ability, and improve learning efficiency. Reference | Related Articles | Metrics | Comments（0）

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Research on Fault Diagnosis of Automotive Automatic Production Line Based on DT LIU Ya, HE Liangtao, CHANG Shuo, QI Zemin Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 44-49.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.008 Abstract （92）      PDF（pc） （903KB）（115）       Knowledge map    Save Traditional machine learning algorithms used for fault diagnosis in the automated production lines of automobiles require that the training and test sets have the same distribution and need a substantial number of training samples. However, in practice, fault sample data are difficult to acquire, and the operating conditions of production lines are highly variable, leading to a low fault classification accuracy. In view of these problems, this paper proposes a research method for fault diagnosis in automated automobile production lines based on Digital Twin (DT) technology. This method initially models the actual production lines using SolidWorks, followed by rendering through Unity 3D software, and combines with PLC for DT model simulation. Finally, the method utilizes transfer learning techniques and convolutional neural networks to achieve fault diagnosis. The feasibility of the proposed method is verified by comparison with existing methods. Reference | Related Articles | Metrics | Comments（0）

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Research on Application Technology of Prefabricated Steel Structure Distribution Room ZHOU Ting-ting Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 26-31.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.005 Abstract （122）      PDF（pc） （353KB）（113）       Knowledge map    Save In order to actively implement the overall deployment of the “Action Plan for Carbon Peak before 2030” issued by the State Council, the use of prefabricated steel structure construction technology system to replace traditional reinforced concrete construction technology system has great advantages in saving highly polluting cement materials, reducing construction process pollution, and reducing carbon and energy conservation.With the rapid development of civil and public buildings, relying on the distribution rooms in residential areas, research has been conducted on the production and installation technology of prefabricated steel structure flat steel pipe columns and concrete pouring technology. By analyzing the difficulties in the production and installation of rectangular flat pipe columns, targeted design has been made for the rectangular flat pipe column production and installation control plan, which includes production control points, welding stress relief measures, and production and installation guarantee measures.In response to the difficulties in controlling the compactness of concrete pouring, a construction plan for rectangular flat pipe column concrete pouring has been formed, including a construction technology desktop meeting and technical disclosure system, the concrete pouring process flow, and the main standards for quality control of steel column core pouring concrete.The system scheme formed by this study can be used to guide the production, installation, and concrete pouring construction of prefabricated steel structure rectangular flat pipe columns. It has achieved great results in the construction of residential distribution rooms and can be promoted and applied to civil residential and public buildings. It provides guidance for design and construction personnel, and has advantages such as shortening construction cycles, saving materials, and improving construction quality, especially in terms of energy conservation and carbon reduction. Reference | Related Articles | Metrics | Comments（0）

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Analysis of Pavement Diseases Caused by Thermal Regeneration and Research on On-site Thermal Regeneration Construction Technology for Mtn LI Guangyu, WANG Haijiao, WANG Qiyue Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 7-10.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.002 Abstract （71）      PDF（pc） （722KB）（105）       Knowledge map    Save In this paper, the surface layer diseases of K291+250-K315+085 Xinyuan Expressway in Hebei province and the technical indicators of thermal regeneration pavement were statistically analyzed, and the key technical points of geothermal regeneration construction were summarized. the special maintenance project on the upper layer of the highway can adopt the geothermal regeneration construction technology, make full use of waste milling material, by adding 5% ~ 7% (the content of regenerator is 5% ~ 7% of the asphalt content in the milling waste) Mtn modified regenerator, 20% newly mixed modified asphalt mixture (the blending ratio of milling material and new additive is milling material: new additive =80∶20), through the heating unit heating, so that after the “field processing” of the new asphalt mixture to meet the technical requirements of road upgrading. After paving and compacting, the overall quality of the road reaches the qualified standard and meets the traffic conditions. the construction technology is mature, safe and reliable, energy saving and environmental protection, meets the national requirements of low carbon and economy, and provides construction reference and basis for the special maintenance of highway pavement geothermal regeneration technology. Reference | Related Articles | Metrics | Comments（0）

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Research on Three-Dimensional Slope Modeling Based on GIS and Unmanned Aerial Photography Technology WANG Ruilong, SUN Shiguo, WANG Hengtong, SONG Weiqi Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 61-65.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.011 Abstract （54）      PDF（pc） （903KB）（102）       Knowledge map    Save A three-dimensional modeling method for slopes based on Geographic Information System (GIS) and unmanned aerial photography technology is proposed in order to achieve high-precision restoration of surface texture and spatial undulations. The terrain and landform model is constructed using unmanned aerial photography and measurement techniques, and the stratigraphic model is established using GIS technology, thereby obtaining a high-precision three-dimensional model. In a certain section of a highway project, this method is applied to establish a slope three-dimensional model consisting of surface, stratigraphy, and underground mineral components. The results indicate that the slope three-dimensional model established using this method has the advantages of high accuracy and good visualization, and can accurately reflect the true conditions of the slope. Reference | Related Articles | Metrics | Comments（0）

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Three-dimensional Numerical Simulation of a Landslide in South Bend River Basin Based on the Variation of Reservoir Water Level YU Pei Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 17-22.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.004 Abstract （73）      PDF（pc） （949KB）（100）       Knowledge map    Save Taking Nanwan landslide in Southwest Henan Province as an engineering example, combined with soil mechanics seepage theory and FLAC3D software, three-dimensional numerical simulation of Nanwan landslide in southwest Henan Province was carried out by using finite difference software FLAC3D software through the influence of reservoir water level sudden drop on pore water pressure and seepage field distribution, combined with two-dimensional unsaturated seepage theory and two-dimensional seepage analysis software in soil mechanics. The results show that the pore water pressure of the soil mass in Nanwan landslide in southwest Henan Province tends to increase when the reservoir water level was at 105.89m, and the soil mass was relatively dense, which has no adverse effect on the stability of the landslide. When the reservoir water level drops abruptly, the pore water pressure of the landslide body drops rapidly, driving the flow of soil particles in the landslide body. Due to the change of seepage force, the safety factor of landslide soil mass was reduced, and then the local instability of landslide soil mass was caused. It provides a theoretical reference for the analysis and evaluation of landslide stability under the state of reservoir water level rise and fall. Reference | Related Articles | Metrics | Comments（0）

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Assessment of Emission Reduction Effect of Emergency Control Measures for Heavy Pollution in Cangzhou City LU Ruijuan, GUO Xingli, HAN Xinhao, WANG Hongmei, CHI Meiling Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 74-80.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.013 Abstract （51）      PDF（pc） （1048KB）（99）       Knowledge map    Save Emergency response to heavy pollution weather has played a positive role in giving priority to protecting human health and reducing the peak of heavy air pollution. However, in the actual process of work, as emergency response to heavy pollution weather is at the initial stage and local governments lack practical experience, the pertinence and effectiveness of emergency control measures need to be improved and perfected.Based on the collection and collation of recent air quality data, air pollutant emission status data, source emission inventory data, heavy pollution emergency plan and emergency emission reduction list data, meteorological conditions data, and district-county statistical data, the emergency emission reduction measures of Cangzhou were analyzed. Typical heavy pollution days were brought into The Weather Research and Forecasting Mode(WRF)/Model of Emissions of Gases and Aerosols from Nature(MEGAN)/Sparse Matrix Operator Kernel(SMOKE)/The Comprehensive Air quality Model with extensions(CAMx)regional air quality model system for simulation, and the reduction ratio of four pollutants improvement effects before and after the implementation of emission reduction measures in different districts and counties in Cangzhou City was obtained.According to the model analysis results, the emission reduction measures of each district and county were comprehensively analyzed, and the emergency emission reduction measures and emission reduction effects of typical heavy pollution processes in autumn and winter were evaluated, providing core technical support for Cangzhou to improve and improve the emergency emission reduction effect. Reference | Related Articles | Metrics | Comments（0）

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Analysis of the Key Factors for the Continuous Revival of Baiquan Spring Area in Xingtai WANG Buxin Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 31-35.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.006 Abstract （65）      PDF（pc） （721KB）（98）       Knowledge map    Save With the development of industrial and agricultural production and the increasing exploitation of groundwater, the Baiquan River in Xingtai has been shut down since the 1980s. In recent years, through a variety of measures to comprehensively control over-exploitation of groundwater and water ecological protection and restoration, the Baiquan Spring area has emerged one after another. To ensure the continued revival of Baiquan, the key problems such as the causes of the water cut-off in Baiquan Spring Basin, the causes of successive re-gushing, the over-exploitation of groundwater, the insufficient guarantee of re-gushing and the insufficient emergency measures are analyzed, meanwhile, the necessity and key measures for the continuous reswelling of Baiquan Spring area are put forward, which provides a scientific basis for formulating the goal and option of the sustainable re-gushing of Baiquan Spring area. Reference | Related Articles | Metrics | Comments（0）

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Cultural and Creative Product Design Based on Improved Apriori Algorithm for Cultural Association Feature Mining WU Dingbing Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 56-60.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.010 Abstract （59）      PDF（pc） （765KB）（98）       Knowledge map    Save In order to develop innovative cultural and creative products and improve the design efficiency of cultural and creative products, a product development system of cultural and creative correlation feature mining is designed with the support of improved Apriori algorithm.The system is composed of Apriori algorithm feature correlation module and product design module to improve the mining of cultural and creative feature correlation. The former excavates the correlative features of product design from the cultural information; the latter uses Boolean matrix and support adaptive updating strategy to improve Apriori algorithm and mining accurate correlation features of cultural and creative products. Designers design cultural and creative products through this feature and correlation.The experimental results show that the system can accurately mine cultural features and obtain the correlation between cultural features, and the accuracy rate of product design is greater than 0.90, the highest recall rate can reach 0.96, and the audience satisfaction evaluation is good.The system has good effect in developing cultural and creative products and has practical application value. Reference | Related Articles | Metrics | Comments（0）

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Reasearch on the Development Strategy of Electrical Energy Internet Under the New Development Pattern of “Dual Circulation” LI Yan-yan, XIONG Yi Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 69-75.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.013 Abstract （80）      PDF（pc） （298KB）（97）       Knowledge map    Save At present, the development goal of the electric power energy Internet has been transferred from pilot demonstration to diversified and large-scale development in China. Meanwhile,the Belt and Road Initiative (BRI) brings opportunities for common development to countries along the routes, and lays a preliminary foundation for the dual circulation of electricity and energy Internet. This article explores the value choices for the development of electric power energy Internet that not only adapts to the realistic conditions of the new stage of economic and social development, but also brings great benefits for China to integrating into the international environment, constructing the global energy Internet, and breaking through the bottleneck constraints of the development of electric power energy Internet.Under the new development pattern of “dual circulation”, the optimal development path of the electric energy Internet is as follows: building electric internet of things to connect people, material and information resources all over the region, building the global power energy internet to achieve the global power mutual benefit and sharing, relying on technological revolution to support the energy electric connectivity of BRI, bringing about the comprehensive utilization of energy with cooperation and openness, mutual benefit and sharing, and carrying out the strategic synergetic effect of the power energy internet and new development pattern of “dual circulation”. Reference | Related Articles | Metrics | Comments（0）

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Expansion and Quantitative Attribution of China’s Built-up Areas Based on Parameter Optimal Geodetector LIU Dan-dan, LI Yong-liang Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (3): 33-39.   DOI: 10.16046/j.cnki.issn2096-5680.2023.03.006 Abstract （321）      PDF（pc） （464KB）（94）       Knowledge map    Save To study the spatiotemporal changes in urban built-up areas in China over the past 20 years from 2002 to 2021, promoting the urbanization process, and socially sustainable development in China, urban units in China were selected as the research objects. DMSP-OLOS data from 2002 and NPP-VIIRS night light data from 2021 were used, combined with indicators such as expansion speed, standard deviation ellipse, and spatial autocorrelation. Quantitative analysis of the spatial distribution characteristics in built-up areas is elaborated in two aspects: quantity structure and spatial distribution. Some factors are used as independent variables such as GDP difference, population difference, elevation, road network density, temperature difference, and rainfall difference. Expansion speed is used as the dependent variable. The driving force is quantitatively analyzed by parameter optimal geographic detector. 1) In the past 20 years, the expansion speed of urban built-up areas in our country has been mainly in medium and low speed, The annual expansion rate of the built-up areas in the eastern and northern coastal areas is higher than the national average. The middle reaches of the Yellow River and the southern coast are comparable to the national average, while the middle reaches of the Yangtze River, Southwest China, Northeast China and Northwest China are significantly lower than the national average. The eastern coastal areas have the fastest expansion speed and the smallest difference in urban development, while the center of gravity of China′s built-up areas moves 100.22 kilometers from the eastern coastal areas to the northwest. 2) The expansion speed of the built-up area has spatial heterogeneity, reflecting the accumulation of cold and hot spots. Cold spot areas are distributed in the northern and central regions of China and exhibit low-low clustering and high-low clustering, while hot spot areas are distributed in the southeastern coastal areas of China and exhibit high-high clustering and low-high clustering; 3) GDP,population are the main factors affecting the development of built-up areas, with the explanatory power of 0.6395, 0.4965, respectively. The interaction between various factors is either double factor enhancement or non-linear enhancement, with strong interaction between socioeconomic factors, and the strongest interaction between GDP and population factors. The explanatory power of 1.1361 shows a double-factor enhancement. Reference | Related Articles | Metrics | Comments（0）

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Research on Restrained Torsion Effect of Continuous Box Girder Bridge with Variable Cross-section under Moving Load WANG Wei Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 48-52.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.009 Abstract （92）      PDF（pc） （438KB）（90）       Knowledge map    Save In order to study the characteristics of stress distribution and deformation of box girder bridge with variable cross section, the element stiffness matrix of box girder with variable cross section is derived based on the restrained torsion differential equation of box girder.Based on the analysis of the project, three load distribution conditions are set up, and the bending moment and warping displacement of box girder with variable cross-section are calculated, the stress amplification effect is also studied.The results show that the curves of moment changing with longitudinal distance in case 1 and case 2 are similar and show “W” shape.In condition 3, the trend of change was just opposite, myopia presented “M” type, and both the value and the range of change were small.The warping displacements are mainly concentrated at the end and the middle of the side span, and show an anti-symmetric distribution with the mid-span section as the boundary.In case 1 and case 2, the values of the generalized warpage displacement in mid-span and right-span are basically the same.The curve of warping double moment shows the law of attenuation from the peak point to the two sides, and the extreme value appears at the position of the center fulcrum and the action point of the concentrated load.The maximum normal stress of warpage occurs in the section under the action of concentrated load. The stress magnification coefficients of the four control sections are less than 1.41 under three loading conditions. Reference | Related Articles | Metrics | Comments（0）

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Construction of Campus Structure 3D Model Based on Oblique Photogrammetry ZHANG Lijun, LI Yang, JIN Shaofei Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (1): 61-65.   DOI: 10.16046/j.cnki.issn2096-5680.2024.01.011 Abstract （176）      PDF（pc） （1001KB）（89）       Knowledge map    Save With the development of unmanned aerial vehicles and oblique photogrammetry technology, the accuracy and efficiency of 3D real scene modeling have been greatly improved. This article, based on unmanned aerial vehicle tilt photogrammetry technology, constructs a high-precision and measurable three-dimensional model of Hebei University of Water Resources and Electric Engineering. Based on the regional situation ofHebei University of Water Resources and Electric Engineering, 10 ground control points and 16 reference points were set up. DJI Phantom 4 RTK was used for tilt photogrammetry to construct a three-dimensional model of the campus. The problems of model rupture, faults, and incomplete data collection of buildings with high tilt photogrammetry after aerial triangulation were analyzed and solved. With the help of model modification software, the real 3D model of Hebei University of Water Resources and Electric Engineering was modified to address issues such as water surface damage, model vulnerabilities, and blurred texture of billboards. In order to solve the problem of voids caused by high floors in the library building, a high-precision individual model was obtained through a separate close-up photogrammetry. The accuracy analysis of the repaired model was conducted from the perspectives of relative and absolute accuracy, and a realistic 3D model with a mean square error of 3.6cm in plane and 5.1cm in elevation was obtained. Reference | Related Articles | Metrics | Comments（0）

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Design of a Quadcopter Based on Ultrasonic Obstacle Avoidance SUN Xiao-hui, YANG Jin-guang Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (3): 9-13.   DOI: 10.16046/j.cnki.issn2096-5680.2023.03.002 Abstract （201）      PDF（pc） （401KB）（88）       Knowledge map    Save This paper expounds the design of a quadcopter and proposes an overall solution that applies ultrasonic ranging technology to realize the automatic obstacle avoidance function of UAV. Firstly, algorithms such as Euler angle and extended Kalman filtering are applied to process the information collected by the MPU9250 sensor, calculate the position and attitude information, and adjust the PID parameters to realize the steady-state flight control of the quadrotor UAV. Secondly, the information collected by the SUI04 ultrasonic obstacle avoidance sensor is transmitted to the STM32H743 controller, and the corresponding instructions are output through algorithm processing to realize the obstacle avoidance function. Finally, after testing, in the outdoor low-speed flight state, the quadcopter UAV basically realizes the functions of fixed height flight and automatic obstacle avoidance. Therefore, it can be concluded that the automatic obstacle avoidance function of quadrotor UAV can be realized by ultrasonic ranging technology, and the obstacle avoidance effect is relatively stable and has certain practicality. Reference | Related Articles | Metrics | Comments（0）

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Internal Defect Treatment and Technological Comparison of Soil Tunnel in a City Water Conveyance Channel Project FU Ke Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 21-25.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.004 Abstract （143）      PDF（pc） （326KB）（86）       Knowledge map    Save This paper takes the soil tunnel of a long-distance water transmission channel project as the research background, in which the operation life of the tunnel continues to increase, the soil tunnel keeps running at full load for a long time, and there may be leakage, cracks, erosion pits, insufficient strength of concrete components and excessive deformation inside, which will affect the normal operation of the whole channel. Through the field investigation, the artificial investigation and detection of hidden dangers inside the tunnel, cracks, leakage, erosion pits and other defects and problems in different degrees inside the tunnel were found. According to the classification of defect problems, three different construction methods, technological processes and repair materials were used to carry out professional repair of the three types of defects found inside the tunnel, and the effect evaluation was carried out. Finally, good results were achieved. At the same time, advanced technologies such as surface wave method, ground penetrating radar and three-dimensional laser scanning technology are further introduced and adopted to clarify the “recessive” defects existing in the tunnel and establish a tunnel safety monitoring system, so as to provide a scientific basis for the treatment of internal defects in the tunnel at the later stage. It has certain guiding significance to the engineering management of a long distance water transmission channel engineering management department. Reference | Related Articles | Metrics | Comments（0）