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30 September 2021, Volume 31 Issue 3 Previous Issue    Next Issue
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Technology Theory and Application
Management Science Research
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Technology Theory and Application

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Improved Strategy for Copper Electrolytic Cell Structure Based on Finite Element Simulation Analysis CHENG Hai-yu, WANG Chao, DONG En-Ji, CUI Jia-rui, LI Qing 2021, 31(3): 1-6.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.001 Abstract ( )   PDF (2434KB) ( )   Aiming at the copper nail phenomenon of traditional copper electrolytic cell, a structural improvement strategy is proposed based on finite element analysis. Firstly, taking the current density of copper electrolytic cell as the research object, the distribution characteristics of current density of copper electrolytic cell are analyzed from the mechanism; Secondly, COMSOL finite element simulation software is used to simulate the current density of the electrolytic cell in the process of copper electrolysis, and the variation law of the electric field distribution of the anode, cathode and electrolyte in the original cell is obtained. Then, the causes of “copper nails” on the upper part of the cathode plate are analyzed. Finally, by removing the vortex region of the groove wall, the optimization scheme of the groove structure is proposed. The simulation results verify the correctness of the proposed scheme, and the improved slot structure effectively reduces the “copper nail” phenomenon. References | Related Articles | Metrics

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Study of Influence Factors on Asphalt Pavement Subgrade Workspace Depth LIU Xiao-lan, CHEN Hao, LI Zi-lin 2021, 31(3): 7-12.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.002 Abstract ( )   PDF (2344KB) ( )   Because the influence of structure layer parameters, vehicle dynamic load and speed on asphalt pavement sub-grade workspace depth is not considered, this paper analyzes the influence factors of asphalt pavement sub-grade work area depth with the finite element software, including 38 kinds of road structure layer parameters, 5 kinds of vehicle dynamic load and 2 kinds of driving speed. The results are as follows: modulus of pavement has less effect on the sub-grade work area depth, but thickness of pavement has more effect on the sub-grade work area depth, particularly thickness of the grass-roots level. Modulus of soil base has great effect on the sub-grade work area depth, and the sub-grade work area depth increases with the increase of modulus of soil base. The vehicle dynamic load has a linear positive correlation with the sub-grade work area depth, and when the vehicle dynamic load increases 50KN, the sub-grade work area depth increases about 1 m. The vehicle speed has a linear positive correlation with the sub-grade work area depth, and when the vehicle speed increases 10m/s, the sub-grade work area depth increases about 0.4-1.4 m. References | Related Articles | Metrics

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Traffic Diversion Analysis in Highway Work Zone Utilizing Simulation FENG Lei 2021, 31(3): 13-17.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.003 Abstract ( )   PDF (2085KB) ( )   In order to explore the traffic diversion adjacent to the highway work zone, this paper investigates the effect of the short-term and long-term work zone with the simulation method. Additionally, a predicting model for the traffic diversion was built based on the demand/capacity ratio and number of days. The results indicate the dynamic traffic assignment and day-to-day learning module are able to simulate effects of travel time variance on travelling route choice. Moreover, the time variable is not significant for the diversion in short-term work zone, while the long-term work zone is mainly affected by the demand/capacity ratio. The simulation approach and traffic diversion predicting model is meaningful for the traffic management in highway work zone. References | Related Articles | Metrics

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Dynamic Simulation and Control of MSW Disposal System GUAN Hua, LIU Chang-yu, YANG Hao-jie 2021, 31(3): 18-24+46.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.004 Abstract ( )   PDF (3258KB) ( )   The problem of urban household waste disposal restricts the sustainable development of the city and is the focus of attention at this stage. Using the system dynamics method, the causal circuit map of urban household waste is drawn by using VENSIM software, the stock flow model is established, and the proportion of total urban household waste and resource recovery is predicted. The results show that garbage classification is beneficial to resource recycling and reuse. Through the adjustment of the recovery price, the amount of garbage charges and the willingness to classify, the changes caused by the analysis system are most significant. References | Related Articles | Metrics

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Application of Optimal Alignment Method in Hydrological Frequency Analysis Based on Python LEI Qing-wen, GAO Pei-qiang, LI Jian-lin 2021, 31(3): 25-29.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.005 Abstract ( )   PDF (2141KB) ( )   Hydrological frequency analysis is an important link in hydrological and water conservancy calculation. The hydrological frequency calculation method in our country often adopts the assumption that the population obeys the P-III type distribution, and uses the suitable line method to estimate the total distribution parameters through the sample, and then calculates the design value. The three parameters of P-III distribution are obtained by using the optimized line fitting method based on Python algorithm, and the statistical characteristics of the method are further compared and analyzed. Using the AIC criterion and the RMSE to evaluate model, the calculation results show that the optimal line fitting method is better than the moment estimation method, and the ideal fitting effect can be achieved in the hydrological frequency analysis. References | Related Articles | Metrics

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Research on Construction Trestle for Tieshan Port Rigid Bridge in Beihai ZHOU Bao-man 2021, 31(3): 30-35.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.006 Abstract ( )   PDF (2872KB) ( )   According to the construction practice of Tieshan Port rigid trestle bridge in Beihai, Guangxi, combined with the climate characteristics of the Gulf region, the trestle was selected and designed for construction. Finally, the main trestle chose 32# I-beam as the main beam, and the branch trestle adopted Berey beam as the main girder structural form, and determined the structure layout of the main trestle and branch trestle in detail. Through the analysis of the actual working condition of pier and girder beams, using limited element software contact position of different components of the approach bridge for scientific treatment, established the finite element model of the whole structure of pier, and according to different conditions of the main pier, the pier was calculated, the results show that the main pier and the pier strength and stiffness meet the requirements, which can ensure the safe passage of construction overloading vehicles. References | Related Articles | Metrics

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Design of a Vibration Suppression Manipulator for Plate Glass SHI Yan, CAI Guo-qing, ZHANG Peng-cheng, ZHANG Jin-long 2021, 31(3): 36-40.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.007 Abstract ( )   PDF (2923KB) ( )   A kind of vibration suppression manipulator for plate glass is designed, which is mainly composed of a support plate, a fixed plate, a glass adsorption plate, active telescopic rods, driven telescopic rods and different joints. The parallel structure is adopted in this manipulator, which makes up for deficiencies of the current single beam glass up and down manipulator, such as instable movement, stress concentration and so on. SolidWorks software is used to carry out 3D modeling and motion simulation of the manipulator, which verifies the feasibility of the mechanism. ADAMS software is used to simulate the dynamics of the manipulator, and it is verified that the driven rod bears the torque produced by the grabbing bias when the manipulator grabs the glass offset, which suppresses the vibration of the manipulator, improves the strength of the manipulator and prolongs the service life of the manipulator. References | Related Articles | Metrics

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Innovative Design of an Automatic Powder Packaging Machine ZHANG Wan-ming, GONG Xiang, YU Xue, MENG Xian-feng, ZHANG Yu-sheng 2021, 31(3): 41-46.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.008 Abstract ( )   PDF (2866KB) ( )   This paper presents an innovative design method applied to the automatic packaging machine for powder materials. Based on the traditional vertical packaging machine, the twin-screw coarse and fine filling method is adopted, which greatly reduces the precision range of filling.The weighing sensor is used to automatically stop feeding when the setting value is met. The feeding mechanism is a forward and reverse control mechanism, with compact structure and one motor. The sealing part is equipped with electrostatic blanking device to ensure the bag mouth clean. Because of the use of roll type transverse seal, the whole machine can work continuously, improve labor productivity, reduce production costs, improve production environment, and increase product added value, thus bringing greater social and economic benefits. References | Related Articles | Metrics

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Research on Road Performance Prediction Method of Cement-stabilized Macadam Based on Logit Model HANG Zheng-qiang, FENG Qi, LIU Cheng-an 2021, 31(3): 47-51.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.009 Abstract ( )   PDF (2183KB) ( )   The road performance of cement-stabilized macadam has an important impact on the service life of asphalt pavement, and its road performance is closely related to cement content, temperature and curing age.In this paper, the cement content, temperature and curing period are independent variables, and the mechanical strength indicators such as unconfined compressive strength, splitting strength and compression modulus of resilience of cement-stabilized macadam are response variables, and the orderly variable cumulative logit model. Using the numerical statistical analysis software Minitab to calculate and analyze the data files, a performance prediction method for cement-stabilized macadam road performance based on the Logit model is proposed.Finally, the laboratory test data of cement-stabilized macadam is used to verify the accuracy of the prediction model, and the prediction results of road performance of cement-stabilized macadam can be used to guide engineering practice. References | Related Articles | Metrics

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Study on Construction Quality Control of Steel-concrete Composite Truss Girder Bridge SONG Wen-ze 2021, 31(3): 52-57.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.010 Abstract ( )   PDF (2418KB) ( )   The steel-concrete composite girder bridge truss has the advantages of good economic performance, high bearing capacity, large bending stiffness and so on, so it is widely used in our country. However, because the rods that make up the truss are long and thin, the overall heating and cooling of the structure will affect the closing of the truss and the positioning of the truss joints.In this paper, combining with engineering examples, MIDAS software is used to analyze the transverse displacements of trusses produced by different temperatures at the erection stage and the influence of vertical displacements of trusses on other joints after erection.Through the research results, it is concluded that the lateral displacement of the truss is linear under temperature load, and the vertical displacement of the nodes increases or decreases in the same way with other nodes.Therefore, in truss assembly, it is necessary to control the closing temperature within a reasonable range, and in elevation control, multiple nodes can be adjusted simultaneously, and the position and forced displacement of nodes can be determined by superposition principle. References | Related Articles | Metrics

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Research on Mechanical Properties of Cement Stabilized Roadbed Soil DING Peng-fei, ZHANG Zhen-huan 2021, 31(3): 58-61.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.011 Abstract ( )   PDF (1763KB) ( )   In order to explore the influence of cement content and confining pressure on the strength of stabilized subgrade soil, the influence of uniaxial compressive strength, cohesion, internal friction angle and other mechanical parameters on the mechanical properties of cement stabilized subgrade soil is obtained through the indoor unconfined compressive strength test and triaxial compression test. The correlation between unconfined compressive strength and stabilizer is studied by regression analysis. The fitting formula of compressive strength and cement content is given to predict the reasonable range of cement content. The results show that the unconfined compressive strength, shear stress and residual strength increase with the increase of cement content, the cohesion first increases and then decreases slightly, and the internal friction angle moves up and down slightly. The shear peak stress and residual strength increased with the increase of confining pressure. References | Related Articles | Metrics

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Research and Development of an Automatic Light-seeking Potted Plant System Based on Wi-Fi GAO Bo, LI Zhao-ze, ZHANG Chun-qian, PENG Cheng, LU Wen-mei 2021, 31(3): 62-66+71.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.012 Abstract ( )   PDF (2098KB) ( )   Aiming at the problem of unattended potted plants for a long time, an intelligent potted system that can help plants find light automatically is designed. STM32F103ZET6 is used as the system controller. The system obtains real-time environmental information of potted plants through the analysis of photosensitive sensors, temperature and humidity sensors, and uses automatic light-seeking and intelligent watering modules to ensure the normal growth of plants. At the same time, the system builds an Internet of Things platform based on the ESP8266 Wi-Fi module, and uses the mobile phone app to realize the user's remote monitoring and intelligent control functions. After testing, the system can realize the functions of automatic light finding, intelligent watering and remote monitoring, and meet the long-term unattended growth needs of potted plants. The system also has the advantages of stable performance, simple and flexible operation, convenient operation and maintenance. References | Related Articles | Metrics

Management Science Research

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Discussion on Critical Problems of Barrier-free Environment Construction and Development Planning Li Chen, Han Xue 2021, 31(3): 67-71.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.013 Abstract ( )   PDF (2360KB) ( )   Promoting the construction of barrier-free environment and strengthening the leading role of planning are important contents of social equity in spatial planning.On the basis of clarifying the service object and construction content of barrier-free environment construction, this paper puts forward the basic principles and strategies of development plan. Following the principles of demand orientation, problem orientation and goal orientation, and based on the three-dimensional co-construction of concept, system and utensils, a systematic planning system is established to provide reference for future planning. References | Related Articles | Metrics

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The Vitality Reconstruction of Outdoor Public Space in Healthy Communication Resettlement Area YIN Zi-yan, TANG Wen-li, HU Run-ying 2021, 31(3): 72-76.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.014 Abstract ( )   PDF (2280KB) ( )   The resettlement area has both rural and urban characteristics, where many residents have the original rural neighborhood relationship and strong communication willingness. Due to the change of life style and residents' space, the neighborhood relationship is gradually disintegrated and the residents are gradually alienated. As the place of outdoor communication activities, the public space of residential area plays an important role in the neighborhood communication. Through discussion, visit and survey, questionnaire survey on the current situation of public space use and infrastructure setting in five resettlement communities in Hefei Xinzhan District, this paper understands the behavior characteristics of community residents, analyzes their psychological needs, and the reasons for the lack of vitality of public space, and thinks about the principles of constructing the vitality of public space in resettlement communities from four aspects of love cohesion, love communication, love company and love health. In order to build a livable, humane and belonging residential area and enhance the residents' happiness, the paper puts forward some suggestions to rebuild the vitality, strengthen the communication between neighbors, and improve the vitality of the public space. References | Related Articles | Metrics

Basic Science Research

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Boundeness of Vector-valued Martingales on Weak BMO Spaces WANG Ru-hui 2021, 31(3): 77-80.  DOI: 10.16046/j.cnki.issn2096-5680.2021.03.015 Abstract ( )   PDF (1587KB) ( )   Let X be a Banachspace, :(0,1]→(0,1]. It is proved that X is isomorphic to a q-uniformly convex Banach spaceif and only if the q-mean-square operator S(q)(·) for martingales are of types(BMOq,(X),Lq (R)); and X is isomorphic to a q-uniformly smooth Banach space if and only if the operator for martingales are of types(Lp (X), BMOSpp,(X)). A new characterization of the q-uniformly convexity and p-uniformly smoothness of Banach space is obtained in the result. References | Related Articles | Metrics