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30 September 2024, Volume 34 Issue 3 Previous Issue    Next Issue
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Column on Water Conservancy Engineering and Water Conservancy Informatization
AI Robotics Column
Geotechnical Engineering Column
New Energy Engineering column
Mechanical Engineering Colunm


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Column on Water Conservancy Engineering and Water Conservancy Informatization

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Optimization of Irrigation Schedule for Wheat Fields in North China Plain Based on WHCNS Model YU Qing, WANG Yahui, FENG Yu, ZHOU Yuanhang, FENG Yixiang 2024, 34(3): 1-6.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.001 Abstract ( )   PDF (357KB) ( )   Grain production in North China is prominent in the whole country, but there is a serious shortage of agricultural water. In this study, winter wheat in North China Plain was taken as the research object. Firstly, the experimental data of North China in 2004 and 2006 were used to analyze the water movement law and utilization efficiency under the traditional irrigation system. Combined with WHCNS model, different combination irrigation scenarios were simulated (the total irrigation amount was set to change from 100mm to 450mm, and the irrigation times were increased to 5 times), and the irrigation amount was optimized by using the comprehensive index method. Finally, 350mm is the best irrigation schedule in the simulation. References | Related Articles | Metrics

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Automated Application of Blasting Vibration Monitoring in Henan Wuyue Pumped Storage Power Station WU Zuosheng, ZHOU Guangyu, LI Zhuangzhuang, WANG Shiyang 2024, 34(3): 7-10.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.002 Abstract ( )   PDF (206KB) ( )   To ensure that the blasting construction during tunnel excavation does not affect the safety and stability of surrounding civil buildings, an automated blasting vibration monitoring system was developed based on network blasting vibration logger. The system uses advanced sensor technology, efficient data processing algorithms and intelligent interactive interfaces to collect and analyze vibration data in real time. Through this system, real-time monitoring of changes in blasting vibration data can be achieved, providing accurate and reliable feedback information to relevant units, thereby ensuring construction safety and improving construction efficiency. This automated monitoring system played an important role in the tunnel excavation construction in Henan Wuyue Pumped Storage Power Station. References | Related Articles | Metrics

AI Robotics Column

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Innovative Design of Fighting Robot Based on AHP/QFD/TRIZ Theory ZHAGN Tiebi, ZHANG Wanming, LI Wenbin, SHANG Jiayao, SHAN Jingcai 2024, 34(3): 11-18.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.003 Abstract ( )   PDF (558KB) ( )   To solve the complex working conditions of fighting robots, improve their ability to hit and withstand hits, and optimize the product innovation design process of fighting robots, a design method for fighting robots based on AHP/QFD/TRIZ theory is proposed.Firstly, user needs are obtained through questionnaire surveys and interviews with customers. The hierarchical analysis method (AHP) is used to sort the importance of the needs. Then, the quality function deployment (QFD) theory is applied to match user needs with technical quality indicators, and build a quality house (HOQ) model. Finally, the conflict resolution principle in TRIZ theory is used to solve the conflicts found in the quality house, and obtain product innovation design plans to provide theoretical support for the innovative design of fighting robots. Experimental data shows that under the premise of ensuring strength, the designed scheme can reduce overall weight and increase speed. The design method based on AHP/QFD/TRIZ theory is used to innovatively design products for fighting robots, which improves product performance and customer satisfaction. References | Related Articles | Metrics

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Research on Independent Reference Model-based Anti-interference Backstepping Control LI Jun, LI Guoming, ZENG ZhengLin, HAN Chuanxiang 2024, 34(3): 19-23.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.004 Abstract ( )   PDF (316KB) ( )   An anti-interference backstepping control method based on an independent reference model was proposed, which performs well in the application of classic single stage linear inverted pendulum systems. Firstly, a backstepping controller for a single stage linear inverted pendulum is designed and an independent reference model of the system is obtained. At his point, if the single stage linear inverted pendulum is disturbed, it will deviate from the ideal value of the independent reference model. To improve the anti-interference performance of a single stage linear inverted pendulum, a generalized state error is introduced, which refers to the error between the independent reference model output and the actual system output. Then, based on the generalized state error and backstepping control method, the controller is designed using Lyapunov stability theory. Finally, a single stage linear inverted pendulum anti-interference backstepping controller based on an independent reference model was obtained. The simulation results show that the controller can effectively suppress the influence of external interference on the single stage linear inverted pendulum, and has strong robustness and anti-interference ability. References | Related Articles | Metrics

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TMulti-target Detection of Smart City Based on Improved YOLOv5 Algorithm WANG Jichao, TANG Yong, HUI Zhenqiao, LIU Haozhuo, LIU Bing 2024, 34(3): 24-29.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.005 Abstract ( )   PDF (342KB) ( )   As the core technology of smart city construction, multi-object detection plays an irreplaceable role in establishing city map, mining city operation law and improving city operation efficiency. Based on the excellent target detection model YOLOv5, this paper selects typical scenes in cities, takes pedestrians and vehicles as detection targets, and improves the SPP module of the neck part of the original lightweight version algorithm to ensure detection speed and increase detection accuracy. Then, the improved algorithm and YOLOv5-s algorithm were deployed on the edge devices of smart cities at the same time, and a comparative test was conducted. Experimental results show that compared with YOLOv5-s algorithm, the improved algorithm in this paper can improve the multi-target detection accuracy by 15.7% when the speed remains basically unchanged, which solves the problem that the detection rate and accuracy of edge devices in smart cities cannot meet the requirements at the same time to a certain extent, and provides a theoretical reference and method basis for multi-target real-time detection in smart cities. References | Related Articles | Metrics

Geotechnical Engineering Column

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Study on Mechanics and Settlement Characteristics of Solidified Coastal Saline Soil PEI Weibin, SONG Yang, WANG Weihao, QI Ziyi, YAO Weihua, MU Jingzhuo 2024, 34(3): 30-37.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.006 Abstract ( )   PDF (619KB) ( )   The coastal saline soil, being a unique type of soil, exhibits unfavorable engineering characteristics such as solution subsidence, salt swelling, and corrosion. In order to investigate the suitability of lime, fly ash and cement solidified material for improving subgrade soil composed of saline soil, tests were conducted on liquid plastic limit, compaction, unconfined compressive strength, triaxial compression, and solution subsidence. The impact of different conditions on physical indices, mechanical properties, and settlement characteristics of the improved saline soil was analyzed. The results indicate that an increase in the content of curing agent leads to a linear rise in both liquid and plastic limits while reducing the plasticity index. Additionally, incorporating the curing agent decreases the maximum dry density of saline soil without significantly altering its optimum moisture content. Both curing agent content and age exert significant influences on the mechanical properties of coastal saline soil. When the curing agent content is below 14%, an increase in its concentration results in reduced settlement amount. Furthermore, increasing water content and compaction level effectively mitigate settlement in cured saline soils. References | Related Articles | Metrics

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Research on Anchorless Support for the Surge Shaft of Suki Kinari Hydropower Station ZHAO Jianli, HAO Xuehang, YU Yang, LI Pengcheng, GAO Huamin 2024, 34(3): 38-44.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.007 Abstract ( )   PDF (489KB) ( )   Taking the pressure regulating shaft of the Suki Kinari project in Pakistan as an example, this article explores the feasibility and safety of anchorless support for Q4 and Q5 surrounding rock of vertical shafts, namely steel reinforced concrete support measures in practical engineering. The finite difference software FLAC3D is used to establish a three-dimensional model and numerical analysis of the excavation support process of the project, and the stress state of the sprayed concrete and steel is calculated to achieve good anchorless support results. The monitoring of the construction shaft during the construction period shows that this support method is safe and reliable, reduces construction procedures, saves project investment, and provides valuable reference for other similar projects. References | Related Articles | Metrics

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Preparation of Inorganic Self-repairing Microcapsules and Properties of Cement Mortar Specimens FU Jianhang, WU Jinhua, GUO Hengyu, YANG Xiaonan, LIU Jingtian 2024, 34(3): 45-49.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.008 Abstract ( )   PDF (377KB) ( )   The mechanism of the microcapsule self-repairing technology for cement mortar was introduced,the microcapsules of polyvinyl alcohol coated inorganic expanded perlite were fabricated by vacuum adsorption, and the self-repairing cement mortar was made by adding this microcapsule into the cement mortar in this paper. Through studying the influence of the microcapsules on the strength and workability of the cement mortar, the optimal dosage of the microcapsules was determined to be 1%. The repair performance of the self-repairing cement mortar for load-induced damage was evaluated: the repair rate of 60% flexural strength after 28 days of preloading for load-induced damage was 16.25%, and the repair rate of 60% compressive strength after 28 days of preloading was 3.43%. References | Related Articles | Metrics

New Energy Engineering column

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Numerical Simulation on Direct Contact Condensation of Non-condensable Vaporin in T-type Microchannel ZHOU Pengcheng, LI Shuqian, FAN Kailun, ZHANG Cunlan 2024, 34(3): 50-60.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.009 Abstract ( )   PDF (763KB) ( )   Using the VOF multiphase flow model, the LES turbulence model is combined with the “double drag” model and Fick's law. The mechanism of non-condensate gas on the morphology, pressure distribution and condensation rate of direct contact with steam was studied. The results show that in the condition of a small amount of non-condensate gas, the gas-liquid phase interface still shows periodic change, with the increase of non-condensate gas content, the thickness of the non-condensing gas layer formed at the air-liquid interface increases, and the gas feather has no periodic change. In addition, with the increase of the noncondensing gas content, the pressure oscillation strength decreases, the negative pressure value formed by condensation becomes smaller, and the condensation rate decreases. References | Related Articles | Metrics

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Experimental Study on Heating Process of Direct Floor Radiant Heating with Air Source Heat Pump NIU Jianhui, WANG Haichao, LV Tianshu, AN Zelong 2024, 34(3): 61-67.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.010 Abstract ( )   PDF (504KB) ( )   The air source heat pump direct floor radiant heating system directly heats the floor with refrigerant as the heat medium, which has the advantages of simple system and good heat transfer effect. An experimental device of capillary floor radiant heating with air source heat pump was built, and the heating process experiment of capillary floor radiant was carried out at different outdoor ambient temperatures. The experimental results show that when the outdoor temperature is -5 ℃, it takes about 120 minutes for the floor temperature to stabilize. The temperature difference between the refrigerant vapor inlet and outlet ends of the same capillary wall is relatively small at 1.55 ℃, while on the surface of a 20mm thick cement floor, the temperature difference is 1.73 ℃. When the outdoor ambient temperature is -10 ℃, the floor heating rate is the slowest at 1.5 ℃/10 min, and the indoor air heating rate is 0.9 ℃/10 min. At this time, the heating COP of the system is stable at 3.06. References | Related Articles | Metrics

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Application of Cascade Utilization of Geothermal Tail Water Heat Pump Techonology MA Na, FENG Yongsheng, WANG Lixiang 2024, 34(3): 68-72.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.011 Abstract ( )   PDF (245KB) ( )   According to the example of geothermal tail water utilization project in the region with geothermal resources, the geothermal tail water can be used step by step through data analysis, combined with water source heat pump technology, which can make full use of geothermal energy, increase its heating area, save energy and protect the environment. It provides a good reference for the winter heating mode in Xiong'an New Area which has rich geothermal resources. References | Related Articles | Metrics

Mechanical Engineering Colunm

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Design and Experiment of Screw Extruder for Paint Slag ZHANG Zhen, ZHANG Wanming, ZHANG Pengcheng, LI Wenbin, MA Yibo 2024, 34(3): 73-77.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.012 Abstract ( )   PDF (258KB) ( )   A screw extruder was developed to treat paint slag by extrusion, which is a solid-liquid separation method to reduce the moisture content of paint slag. The design of the key components such as screw shaft and screen was carried out. The moisture content and discharge amount of paint slag were used as assessment indicators for a dehydration experiment with water-based paint slag as raw material. As the outlet pressure increased, the moisture content and discharge amount per unit time of paint slag decreased, according to the results. The outlet pressure was set to 0.7 MPa, considering both the dehydration effect and device operation efficiency. The moisture content of paint slag was 54% and the discharge amount was 2.2 kg/h at this point. By reducing the moisture content by about 36%, the screw extruder can dehydrate paint slag efficiently, which reduces hazardous waste treatment costs and circulating water loss for sheet metal spraying enterprises. References | Related Articles | Metrics

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Structural Design of the Adhesive Coating Workbench for Automotive Reducer Seals LI Xinliang, FU Yanhong, LIU Yu, WANG Yining 2024, 34(3): 78-84.  DOI: 10.16046/j.cnki.issn2096-5680.2024.03.013 Abstract ( )   PDF (357KB) ( )   Based on the sealing effect and service life of automotive reducers, this article introduces the structural design process of a gearbox sealing component gluing workbench, which solves the problem of oil leakage in automotive reducers by replacing manual gluing with automatic gluing. Perform calculations and finite element analysis on the structure of the workbench, utilize the combination of sensors and cylinders, drive the workpiece by an electric motor to complete the gluing process, and use cylinders to compact the sealing components of the gluing process. The results indicate that the designed workbench can complete the gluing and compaction work of the workpiece, meeting the requirements for use.The use of automatic gluing instead of manual gluing greatly improves efficiency and construction quality, while reducing the labor intensity of workers. References | Related Articles | Metrics