bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Information System and Computer Internet Technology in Integration of Geographical Indication Agricultural Products
Authors: Tong Zhi
Published: August 2021

This article discusses the connotation and core value of geographical indications to protect agricultural product brands, analyses its brand marketing strategies, and proposes several supporting marketing strategies. At the same time, based on the big data Internet technology and research on the related technologies of the agricultural product brand e-commerce recommendation system, the paper proposes an explicit and implicit combination of agricultural product brand strategy recommendation hybrid collaborative filtering method. This method improves the traditional collaborative filtering method based on the subjective scores of customers. Based on subjective scores, it also combines the time of customers browsing website pages to find the user’s nearest neighbours. The research results found that the system can not only help users quickly recommend agricultural products that meet their needs in the massive information, but also provide more similar information for users to identify.
Velocity Radar Applied in the Research of Muzzle Velocity Measurement and System Correction Method of Naval Gun
Authors: Hu Jiang , Zhao Yadong , Qian Jia , Sun Dongyan
Published: August 2021

During naval gun firing at sea, shore or air target, the muzzle velocity of projectile is the important factor for naval gun to increase firing accuracy. Because velocity radar holds the merits of high accuracy and good real-time performance, it has become the main approach for naval gun to measure muzzle velocity. Firstly, this paper analyses the influencing factors of naval gun’s muzzle velocity, and studies the measurement and correction principle of velocity radar. Then the paper discusses the composition and operation process of velocity radar, and demonstrates the necessity to enhance the measurement accuracy of velocity radar. This research has practical value on equipment development and combat application for velocity radar.
Research on Simulation System Model of Diesel Engine Applied to Virtual Calibration Development
Authors: Lv He , Ling Jian , Li Jingyuan
Published: August 2021

In order to meet the increasingly strict emission regulations, more complex control systems are used in the engine, which increases the calibration workload by several times. Virtual test bed is a method to greatly reduce the calibration cycle, workload and cost by replacing the real engine and vehicle for the hardware in the loop virtual calibration research. Virtual calibration process mainly includes experiment design, virtual experiment, model construction, data optimization, MAP generation and calibration result test. This paper mainly describes the establishment method of the simulation model of diesel engine of China 6 applied to virtual calibration based on the AVL CRUISETM M and MoBEOTM. The differences between the test results and the simulation results under the steady-state and transient conditions of the model were compared. The results of stationary mode and cold WHTC show that the model is of good quality and can be used in the research of virtual calibration development.
Measurement and Analysis of Transient Information Characteristics of IOT Equipment Using Graphical Programming
Authors: He Fengping
Published: August 2021

The switching on and switching off operation of some IOT devices is a complex physical, chemical and mechanical nonlinear transient process, which contains a lot of information. The information has distinction, stability and clear physical meaning. Due to the short time of transient process and the rapid change of waveform and characteristic parameters from time to time, it is difficult for traditional test instruments to capture the characteristics of voltage, current and power consumption in the transient process. Therefore, this paper develops a set of transient characteristic test system of IOT equipment by using the graphical programming software LabVIEW, which realizes the accurate measurement, automatic analysis and display of transient process waveform and characteristic parameters. Taking the operating coil of an electronic product as the test object, the transient characteristics in the whole process of on-off, closing process and breaking process are tested and verified by using the test system, which improves the efficiency of detection and analysis of the performance of IOT equipment.
Research on Self-Healing Mode of Communication Channel of Regional Power Grid Stability Control System
Authors: Li Guohao , Peng Zhigang , Yu Bin
Published: August 2021

Under the new situation of large power grids, security and stability control systems and their communication channels are facing new changes and new requirements. The article proposes a smart grid dispatching control system multi-channel information intelligent comparison method, through the network monitoring method to obtain the main plant station information interactive communication message, using the intelligent comparison algorithm to compare remote signalling, telemetry, sequence of events (SOE), Communication protocol parameters such as remote control and remote adjustment are compared, and alarm events are output in time according to the comparison results. By combining the principle of the stability control device and the principle of communication self-healing, the influence of the stability control channel communication self-healing ability on the operation of the stability control device is analysed, and the influence of whether self-healing is adopted in operation is analysed. Based on the comparison, it is concluded that the communication channel of the regional network stability control system should use self-healing method.
Internet Live Broadcasting Information System Construction for Domain-Specific Knowledge and Susceptibility to Interpersonal Influence
Authors: Deng Yongliang , Chen Bingni , Zhang Hua
Published: August 2021

Drawing on social identity theory and susceptibility to interpersonal influence theory, the study examine the influence of fans’ susceptibility to interpersonal influence on their buying intention during Internet Live Broadcasting, and the influence of domain-specific knowledge and social identity on susceptibility to interpersonal influence. By describing how fans’ personal characteristics determine their susceptibility to interpersonal influence, we built a mechanism explaining why fans may buy the product recommended by the Internet Live Broadcasting. We conducted an online survey to test the model. The findings may help sponsors of the Internet Live Broadcasting to turn more and more fans into consumers.
Calibration Method for the Bubble Angle of Inclination for the Spirit Levels Based on the Calibration Device
Authors: Yang Yi , Wang Tao , Zhu Gang
Published: August 2021

A calibration method for the bubble angle of inclination for the spirit levels based on the calibration device was proposed. A special calibration device is used to calibrate the angle value of the bubble for the spirit levels. According to the proposed calibration method, the uncertainty evaluation model is established and the source of uncertainty is analyzed. Taking a spirit level with a nominal precision of 0.5mm/m as an example, the calibration of the bubble angle of inclination is realized by using the method proposed.
Target Denoising Method Based on Fusion of Adaptive Filter and Sparse Representation
Authors: Gao Tian , Wang Xingshun , Jiang Liwei , Hou Yanan , Qiu Liyuan
Published: August 2021

Acoustic signals are often used to detect and track targets in target detection field. Because of the complicated underwater, air and solid environment, the echo signals are often affected by environment that affects the analysis and processing of the detection signal. Aiming at this problem, this paper analyzes and studies the use of adaptive filter, and analyzes the model making use of the reference. Signal source is used to denoise the target signal. The method is applied for processing the data. The simulation results show that the proposed method greatly improves the target identification, enhances the SNR and highlights the features of echo signal. This method improves the recognition accuracy significantly.
Single node failure repair method for distributed storage system based on genetic algorithm and MSR code
Authors: Qiu Xiaoyue , Wang Tiantian , Lin Enze , Lu Zongpeng
Published: August 2021

In view of the minimum storage regeneration (MSR) single fault node repair plan, design a kind of new single repair fault node topology. Consider link bandwidth available and the node processing power of heterogeneity, the repair delay and repair traffic node of combinatorial optimization. Topology can be converted to Steiner tree model with constraints, and design the corresponding hybrid genetic algorithm to solve the approximate global optimal solution. Finally, a compromise between the two optimization objectives is achieved. Simulation results show that under the same MSR code size, the repair delay of this topology is only 60%-80% of that of the traditional tree topology and 30%-40% of that of the traditional star topology. While the repair traffic for this topology is 9% to 65% higher than for the traditional star topology, the repair traffic is only 40% to 55% higher than for the traditional tree topology.
Design and Application of VR Lab Based on Unity
Authors: Fang Huang , Xiru Yuan , Kun Huang , Wenxin Li , Haodong Tian
Published: August 2021

In order to realize the interactive design of the VR laboratory based on unity. The first experimental building of Southwest Petroleum University (Nanchong Campus) is taken as the foundation environment, and the scene interaction is deeply studied. Based on C# and js language, Photoshop is the image processing software, based on 3d max three-dimensional modeling and virtual interaction technology. Finally, it connects the HTC Vive device to realize the roaming function of the laboratory and some experimental functions, and completes the production of VR laboratory. The VR laboratory is based on the background of “VR+education”, which is of great significance to the development of experimental teaching in schools. It is beneficial to promote the development of virtual reality technology in education and teaching, and has application value.
Prediction of Chinese Port Cargo Volume Based on BP Algorithm
Authors: Zhong Chenwei
Published: August 2021

With the implementation of maritime power strategy, China attaches more and more importance to port economy. As a powerful indicator to measure Marine economy, port cargo volume can reflect whether the effectiveness of port construction in China is remarkable at the present stage. In this study, the author takes the cargo volume data of China’s ports from 2010 to 2017 as the training data, and predicts the cargo volume of a January in 2018 and 2019 based on the time series method combined with BP neural network to determine the feasibility of the prediction model.
A real-time singing scoring system based on virtual reality technology
Authors: Zhang Pei , Han Yi , Liang Weidan , Chen Jingyi
Published: August 2021

In this thesis, a real time singing scoring system based on virtual reality technology is proposed. When a user sings a song, the system will analyse and process the user’s audio, compare it with the standard audio, give the corresponding score and change the character animation in the scene in real time according to the score level. By giving the user a visually realistic experience, the system creates desensitisation, thus reducing the user’s fear of performing on stage and improving their ability to perform on stage.
Research on collaborative filtering based on user interest in the higher vocational e-commerce website development
Authors: Gong Songjie
Published: August 2021

E-commerce Recommender Systems suggest useful and interesting products to customers in order to increase user satisfaction and online conversion rates. They typically exploit explicit or implicit user feedback such as ratings, buying records or clickstream data and apply statistical methods to derive recommendations. Collaborative filtering is one of the most widely used approaches in recommender systems. However, the traditional collaborative filtering methods compute users’ similarities in the dimension of products, and they do not take the influence of neighbor users into consideration when computing such similarities. This paper focuses on explicitly formulated user requirements as the sole type of user feedback. The new collaborative filtering method based on user interests’ transmission. This method computes customers’ similarities in the dimension of interests, and takes the interests transmission between different customers into reflection. This method not only can cope with cold start problem and data sparse problem, but also have prediction precision.
Design and Implementation of Virtual Experiment System Platform for Electrical and Electronic Engineering in Vocational College
Authors: Yikui He
Published: August 2021

Under the influence of modern vocational education, virtual simulation experiment teaching is widely used as a new teaching method. The traditional electrical and electronic virtual simulation experiment teaching platform has low sensitivity and poor interaction. In this paper, a new kind of virtual simulation experiment teaching platform of electrical and electronic in Vocational College is built by lab view. Through the analysis of the experimental effect, LabVIEW software can realize the virtual simulation of electrical and electronic experiments and the establishment of virtual instruments. The integrated teaching can be easily realized through lab view. It provides a certain reference for the virtual simulation experiment teaching in vocational colleges.
Optimization and Implementation of H.264 Encoder Based on DSP Platform
Authors: Yikui He
Published: August 2021

Aiming at the problem of low precision and long running time of traditional H.264 encoder algorithm, this paper proposes two optimization methods. One is to propose a method suitable for DSP to carry the reference frame, which can reduce the waiting time of DSP operation unit. By using DMA to read the data stored in the external access device in advance, all the data involved in the operation are stored in the memory of DSP chip. This improves the operation efficiency of DSP. Second, the macroblock based loop filtering makes the access times of DSP external memory minimum, and enhances the DSP’s ability of processing data. The test results show that the average decoding speed of the decoder is increased by 60% by the two optimization methods. The test system can decode CIF image at 526 MHz, and the speed can reach 30 frames per second.
Application RFID and Wi-FI Technology in Design of IOT Sensor Terminal
Authors: Xu Ning , Song Yumin , Meng Qingshan
Published: August 2021

In this paper, the author studies on the design of picking robot using IOT sensor terminal based on RFID and Wi-Fi Technology. It provides comprehensive information for scientific research, this paper designs a precision agriculture information perception system based on automatic picking robot. The whole system consists of wireless sensing network, transmission node, GPRS and upper computer management system. The wireless sensing network is composed of sensing terminal and sensing module, and connected through standard interface. The system can sense the information of crop growth environment and crop physiology in real time. And the data is reliably transmitted to the upper computer management system. The upper computer management system first processes the data, writes the data into the database, and displays and publishes the data online through the web system. Long time running test shows that. The system performance is stable and reliable.
Optimal Design and Numerical Simulation of High Reliability Meltblown Die
Authors: Liu Jinnan , Cheng Shouguo
Published: August 2021

Double-slit nozzles are widely used in meltblown equipment. During the production process, two streams of high speed, high temperature hot air are ejected from two slits on both sides of the spinneret and converge to stretch and refine the polymer melt extruded from the spinneret. If we know the changes of airflow temperature and velocity in the flow field, we can simulate the fiber stretching and refinement process and predict the fiber properties to understand the fiber stretching mechanism, so as to guide the optimization design of meltblown process and improve the product quality and cost saving. In this thesis, a new meltblown die nozzle flow field model is developed based on the existing meltblown double-slot nozzle structure, which was improved from the theoretical model of meltblown double-slot nozzle developed by Ting Chen et al. In this thesis, the calculation area is determined and divided into meshes, and the Reynolds stress model is selected to simulate the flow field numerically, and the velocity and temperature distribution of the flow field along the axis of the spinneret is obtained.
Research on Design Scheme of Multi-campus College Student Management System Based on Cloud Computing
Authors: Niu Chengyi
Published: August 2021

With the continuous expansion of the enrollment scale of colleges and universities, the number of students in school has doubled, and the amount of student information has increased dramatically; In addition, due to the development and merger of colleges and universities, there are many campuses in many colleges and universities, which are accompanied by the dispersion of students and administrators. To facilitate unified management, a multi-campus college student management system based on cloud computing is designed and developed, which integrates information management, statistical analysis, online information publishing and collection. This paper expounds the system analysis, functional module design, system design and key technologies involved in the process of system implementation. Through the interaction among various models, a complete and dynamic system is formed, which is committed to the management of multi-campus students, so as to improve the autonomous management, self-positioning and self-improvement.
Analysis on the Change of Big Data and Computer Network Communication Technology Based on Multi-platform
Authors: Yan Yueying
Published: August 2021

Since the 20th century, information and network technology, mainly represented by microelectronics, computer communication and network technology, has progressed and developed rapidly, and its dissemination and application have had a significant impact on economic development and social transformation. Among them, modern computer communication is an emerging discipline that effectively combines modern computer technology and communication technology. It has developed rapidly after experiencing the information revolution, which has greatly changed the daily work and lifestyle of people in modern society, and the changes in communication have also changed. After entering the new era, the conversion stage from analog signal to digitization to communication signal has basically ended. However, in the field of modern digital communication, there is still a lot of room for the advancement and development of electronic computer technology. Many new technologies and new technologies are emerging in an endless stream, which also provides ample room for future development of the industry. This article analyzes the transformation of computer network communication technology based on multi-platform data. First, use literature research methods to analyze the advantages of computer network communication technology in the era of big data. And summarize the problems of computer network general technology, and then use questionnaires based on big data platform to investigate the impact of computer network communication technology changes on people and the failure of computer network communication in life. The result shows that the video upload fails. The occurrence is very high. About 60% of people have experienced video upload failures. There are relatively few failures in hacking and image upload failures. This shows that the solution to the information network security problem in China is still possible, but the video high incidence of upload failures indicates that the speed of computer network communication needs to be strengthened. The direct impact of the reform of computer network technology is that people have more frequent contacts. About 50% of people have more frequent contacts with family and friends after the reform of computer network technology.
Application Structure Computer Big Data Technology in Internet Learning
Authors: Yang Xuliang
Published: August 2021

The establishment of online learning platform through the Internet is a more popular way of learning. However, the existing Internet learning platform is still not intelligent enough, especially in data integration and analysis. Therefore, this paper proposes the application and research of computer BD(Big Data) based on structure in Internet learning. In this paper, the structure of computer BD and Internet learning methods for in-depth research and analysis, the existing problems in the Internet learning, combined with structural computer BDAT(Big Data Analysis Technology), established a new Internet learning BD analysis method. In view of the complex source of Internet learning data and large amount of invalid information, this paper optimizes and improves the traditional BD analysis data preprocessing method according to the characteristics of Internet students’ learning. Through the optimization and improvement of the method in this paper, the data analysis ability of the system is improved. In order to further verify the practical application effect of structural computer BD in Internet learning, this paper takes the freshmen of computer major of grade 2018 in a university as the research object of this experiment and carries out relevant investigation and research. According to the survey, 90.3% of students think that BD analysis can improve their mastery of knowledge in online learning. The analysis shows that the structure-based computer BD plays a good auxiliary role in students’ Internet learning.
A Device Performance Data Acquisition System Based on Data Fusion Method
Authors: Huang Jianhua , Liu XinLin
Published: August 2021

The data acquisition system is a system which collects the analog signal from the sensor, converts it into digital signal, then sends it to the computer for processing, and outputs the processing results in the form of demand. Based on the research of USB technology, this paper describes a data acquisition system based on data fusion technology, including hardware design, firmware design, device driver design and host application design. In the part of hardware design, this paper first describes the performance and characteristics of data acquisition chip, FPGA and USB2.0 interface chip, and then gives the specific hardware design scheme. In the part of firmware design, this paper first introduces the firmware architecture of FX2, and then introduces the firmware design of GPIF interface mode in detail. In the driver development part, this paper first introduces the WDM driver development model, and then completes the USB device driver design of the data acquisition system. Finally, the device performance data acquisition system based on data fusion method is completed with driver.
Research on integrated application prospect of railway civil engineering survey and design system based on computer technology
Authors: Wu Chenyu
Published: August 2021

With the continuous improvement and improvement of computer aided design software, engineering designers gradually break away from the paper work of drawing board and draw drawings by computer. These soft wares have strong usability and flexibility. By calling the entity primitive model in the library, the three-dimensional model of the scheme line is constructed in real time, and it is checked and modified in the three-dimensional environment, and different structure types are compared to realize the three-dimensional entity route selection design. It is the trend of the times to integrate and intelligentize from survey design to construction, and it is also the necessary means and demand to enhance the market competitiveness of road and civil engineering survey general contracting projects. The BIM modeling method of existing line structure using advanced survey means needs to be further improved. The main structures of the railway line are modeled based on Civil3D. After assembly and debugging, BIM modeling of various types of railway line structures can be realized.
Algorithm and Convergence Analysis of Absolute Value Equation Based on Hybrid Network
Authors: Yang Yunwen
Published: August 2021

In view of the shortcomings of structured networks that it is difficult to manage complex shapes and unstructured networks cannot calculate the boundary layer viscous flow, an implicit algorithm based on mixed network points is proposed to solve the problem of successful calculation and high viscosity. Comparing absolute values is a difficult NP problem. It is caused by the interval problem and has a wide range of applications in many practical problems, such as: situation problems, semi-monitored and unprotected classification problems, and bag feasibility problems. When solving linear programming, double matrix strategy, quadratic programming and other problems, they must be converted into linear complementarity problems for processing, and linear complementarity problems can be summarized as absolute value equations. This article mainly introduces the smoothing Newton method of absolute value equation and the conjugate gradient algorithm of absolute value equation. This paper uses a hybrid network to analyze the algorithm and convergence of the absolute value equation, and establishes a potential mathematical model. The model is solved by the smoothing Newton method of the absolute value equation and the conjugate gradient algorithm of the absolute value equation, and the algorithm and convergence analysis results of the absolute value equation based on the hybrid network are evaluated, and the model is revised using historical data to improve The algorithm of the absolute value equation and the accuracy of the assessment of convergence analysis results. The experimental results in this paper show that the smoothing Newton method of the absolute value equation and the conjugate gradient algorithm of the absolute value equation increase the efficiency of the algorithm and convergence analysis of the absolute value equation by 23%, and reduce the false alarm rate and the false alarm rate. Finally, by comparing the experimental data analysis of the management strategy of sports services and the analysis of the reconstruction of sports services, the system illustrates the influence of artificial intelligence on the analysis of sports services’ management strategies.
Analysis and Design of College Sports Information System Based on Network
Authors: Baocong Sun
Published: August 2021

This paper mainly studies the design and development of university sports information management system. First of all, research significance of the sports information management system in Colleges and universities, research background, research status at home and abroad, the main contents and methods are described, in addition to the relevant technical information system are introduced, especially the C/S and B/S model are discussed, and introduces its working principle, two hierarchical structure model and its characteristics. Analysis of the advantages and disadvantages of two modes. In addition, in the management information system, database technology plays an important role, from three aspects of database, database management system and database system are introduced in detail.
Research on College Students’ Course Selection Recommendation Model Based on Big Data and Cloud Computing
Authors: Su Fei , Tang Jianyin , Zhang Zhe
Published: August 2021

When students choose courses online, they need to compare and analyze the difficulty of courses, professional relevance and interest, so as to make choices. Therefore, the decision-making process of course selection is the decisive link of online course selection. In the educational administration management system, the course selection system directly faces students and serves them. According to the past management experience, this system involves many links, including majors, teachers, courses, credits, teaching places, students and so on. By means of modern information technology, it is an important measure in the reform of higher education and teaching to integrate the course selection under the credit system with the information network, and to develop an online course selection system for students that adapts to the credit system management mode, which is also the key to ensure the smooth implementation of the credit system teaching reform. In order to improve the optimal allocation performance of students’ course selection and improve the utilization efficiency of course resources, a design method of students’ optimal course selection scheme model based on big data analysis and cloud computing technology is proposed.
Computer Network Security under the Cloud Computing Technology Environment
Authors: Bin Sun , Yongjie Wang
Published: August 2021

The development of network technology has changed the traditional network application mode to coordinate all kinds of data and resources effectively. It brings about the improvement of computer computing ability, data processing ability and storage ability, and offers users a new and optimized usage experience by improving the ability of computer network service. However, the construction of cloud computing technology environment also causes people to worry about the network security, and the problem of computer network security under cloud computing technology environment can not be underestimated. The top priority is to speed up the research and development of defense technology, improve the risk response system, consciously enhance the awareness of security protection, and be answerable for dealing with network risk with multi-pronged measures. This work mainly discussed the problems of computer network security under cloud computing technology environment from aspects of encryption technology, authorized accessing, network monitoring, and consciousness awakening, expecting to provide guidance and reference for computer network security response under the background of cloud computing.
Research on Graphic Design Image Processing Technology Based on Reference Relation
Authors: Xiang Yan
Published: August 2021

At present, with the rapid economic progress, some emerging technologies have emerged. Processing and designing various images with the help of computer software has been widely used in the field of graphic design. With the wide popularization and in-depth application of computers, the application of computer graphics and images in print advertisement design is deepening day by day. Graphic is one of the basic elements of graphic design. As a visual symbol, graphics play a role in carrying and disseminating information and expressing thoughts and emotions. Using computer system for graphic design and production has become the international and domestic development trend, which is the requirement of the times, modernization and the development of the industry itself. Based on the reference relationship, this paper expounds the choice of graphics in graphic design, the role of graphics in graphic design and the relationship between graphics and layout in graphic design. The exploration of graphic elements in graphic design is conducive to the understanding and application of graphic elements in graphic design and the effective transmission of information.
Task optimal scheduling model of machining system based on entity modeling
Authors: Zhang Haoyu
Published: August 2021

The continuous improvement of national economic level makes people more and more demanding on machining. The key to realize the task optimization scheduling of machining system is manufacturing development. Machining process is a typical manufacturing process. The mechanical processing system transforms raw materials or semi-finished products into finished products or parts with qualified shape, size and precision through machining process, and consumes a lot of energy and material resources, and produces a large amount of waste materials, noise and other environmental emissions. Electromagnetic compatibility plays an increasingly important role in today’s scientific research and national defense. In the field of electromagnetic compatibility, electromagnetic compatibility analysis and electromagnetic compatibility prediction are important methods for electromagnetic compatibility research at present. Using software technology to deal with analysis and prediction is a general method, and entity modeling is an essential part of EMC simulation software.
Optimization Design and Experimental Study of S-shaped Inlet
Authors: Shang Yinhui , Ge Changjie , Xiao Lianghua , Yao Jieke
Published: August 2021

Lip and diffuser are two important parts of S-shaped inlet, which are difficult to balance in the optimization design of S-shaped inlet. This paper presents an optimization method for S-shaped inlet. Firstly, the parametric models of the lip and the diffuser are established. Combining with automatic mesh generation technology, numerical simulation and genetic algorithm, an optimization platform of s-shaped inlet design based on Isight is established. Aiming at the design of inlet for an unmanned aerial vehicle (UAV), compared with the prototype, the total pressure recovery coefficient of the optimized inlet obtained by this optimization method is increased by 1.5%, and the steady-state circumferential distortion is reduced by 58.6%. The wind tunnel experiment is carried out to obtain the aerodynamic performance of the inlet, and the experimental results are in good agreement with the numerical simulation results.
Study on the Flow Field in Two-level and Staggered Back Vane and Its Impact on Desulfurization Pump
Authors: Zhang Yu
Published: August 2021

At present, the research on different kinds of the back vane of slurry pumps, such as desulfurization pumps, all focus on simple structures. Many new attempts have been applied in the design of back vane in engineering practice, and the two-layer staggered back vane is one of them. This study analyzes the influence of the new two-layer staggered back vane on the external characteristics, axial force balance, and solid impurities of the desulfurization pump. Based on the steady analysis of single-phase flow, the influence of the two-layer staggered back vane on external characteristics and axial force is studied. It is found that the design of the two-layer staggered back vane has negligible influence on the essential external characteristics of the pump. The design also has the function of balancing the axial force, which is more suitable for the situation that the axial force needed to be balanced is large. Therefore, it supports the two-layer staggered back vane to be widely used in solid-liquid two-phase impurity pumps. Furthermore, the unsteady analysis of two-phase flow is used to study the influence of the two-layer staggered back vane on solid-liquid two-phase flow. It is found that the design without back vane can not prevent the solid phase from depositing between the impeller rear cover and the rear pump cover, which may wear the pump shaft and even block the fluid flow in the rear pump chamber, which may have a severe impact on the mechanical life and performance. The single-layer back vane design can keep the solid concentrating at a low level near the shaft, thus reducing the friction between the solid and the shaft, avoiding the deposition in the rear pump chamber; The two-layer staggered back vane design keeps the solid concentration near the shaft at a lower level and more uniform, and has better protection effect on the shaft, the parts near the shaft, and the rear pump chamber than the traditional structure of the single-layer back vane.
Correction of Reynolds number effect for wind-tunnel model with flying wing
Authors: Yao Jieke , Li Wei , Xu Liang
Published: August 2021

A method of Re (Reynolds number, Re) effect correction based on data of wind-tunnel test for flying wing is proposed in this paper. By investigating change laws for longitudinal aerodynamic and moment coefficient, corrective parameters, correction equations and acquisition of correction quantity are introduced. And at the same time, CFD simulations at different Re are carried out to obtain the evidence of what Re does to aerodynamic characteristics and corrective parameters. To reduce fitting error based on polynomial functions, fitting equations of power exponential function are adopted to obtain correction for all corrective parameters. According to the correction quantities and correction equations, the data for wind-tunnel model is corrected to full-scale model. To verify the present method, the results will be compared with result of supercharging wind-tunnel test.
Optimization analysis for blades of artificial heart pump based on CFD
Authors: Li Tianrui , Zhou Junjie , Yu Yang
Published: August 2021

In this paper, computational fluid dynamics is used to simulate and analyse the flow field of a centrifugal artificial heart pump. First, the structural parameters of the centrifugal blood pump are initially determined, and the three-dimensional model of the flow field is established. The blood supply head of the pump is calculated based on the simulation results. The head of the centrifugal blood pump is 124.31mmHg under the design conditions (rotating speed is 2400rpm, flow rate is 6L/min), which meets the blood supply requirement of the heart pump. Then, by changing the blade profile length and blade shape, the performance of the centrifugal blood pump can be improved. The standard hemolysis index of the improved centrifugal blood pump dropped from 0.0508 to 0.0417, and its head is 119.65mmHg. It indicates that while reducing the destruction of blood cells by the heart pump, the requirement of blood supply head can still be met. The simulation results of this study can provide references for the design of centrifugal blood pump blades.
Numerical Simulation and Analysis of Air Duct of Microbar Air Quality Conditioning
Authors: Wang Hongliang , Shi Pidong
Published: August 2021

A microbar air conditioning duct was taken as the research object, and the flow field characteristics of air conditioning duct were numerically simulated based on CATIA and ANASYS software. According to the numerical simulation results, the pressure field and velocity distribution of the air duct were analysed in detail. The analysis results show that the increase of the inlet velocity of the left air duct is conducive to the increase of the velocity of the air outlet, but the flow resistance is increased. By changing the inner wall structure and inlet area of the air duct on the right side, the wind speed of the rear air outlet can be improved effectively.
Numerical analysis report on fluids in floating photovoltaic power plants
Authors: Bei Yaoping , Yuan Bingqing , Yu Yang , Zhu Liang , Cao Dongmei
Published: August 2021

In this paper, Xihe solar floating photovoltaic power station unit. Simulation analysis is carried out for the structure, strength analysis is carried out for a single solar structure support, analysis is carried out for photovoltaic array structure, and analysis is carried out for rectangular and square structures with different wind directions.
Research on Model Validation and Uncertainty Quantification of Airfoil Flow
Authors: Zhang Chao , Chen Jiangtao , Zhao Jiao , Wu Xiaojun
Published: August 2021

Numerical simulations and wind tunnel tests are both basic methods for aerodynamic research and application. They are the modeling and simulation of real world system. There are various uncertainties in the implementation process. In Computational Fluid Dynamics (CFD), the main sources of uncertainty are the model form, model parameters and numerical solution methods. In wind tunnel tests, there are many uncertainties sources, such as geometric model, test environment, test devices and instrumentation, test methods, data recording and processing, etc. This paper takes NACA0012 airfoil as an example. Bayesian model averaging method (BMA) and grid convergence study are used to analyse model form and numerical solution uncertainty in CFD. For the geometric configuration uncertainty in wind tunnel test, regression analysis and bootstrap method are used to carry out data fusion. Finally, model validation research is conducted.
Research on shock-vortex interaction of fairings based on dynamic unstructured overset grid
Authors: Cui Pengcheng , Chen Jiangtao , Li Bin , Li Huan , Ma Mingsheng , Tang Jing
Published: August 2021

The fairing is used to protect the aircraft from aerodynamic heat and force at high-speed, while there exists strong shock-vortex interaction during fairing separation. The unsteady shock-vortex interaction is numerically studied based on dynamic unstructured overset grid in this paper, where the N-S equations and 6-DOF equations are couple solved. Due to the blocking effect of fairings and shocks, there is a strong vortex inside the fairings. With the separation of fairings, the vortex is strongly compressed by the shock of fairing. When the shock is very close to fairing, the vortex is forced into the Mach cone of aircraft and enlarges the Mach cone. There exists a strong shock-vortex interaction of shock-vortex compressing, transforming of vortex boundary and vortex-shock compressing during fairing separation.
A Review of the influence of active aerodynamic tail on vehicle handling stability
Authors: Yu Wei , Gao Wei
Published: August 2021

In order to improve the safety of road vehicles, various active safety systems have been proposed and developed. These active safety systems include active forward / backward steering, differential braking, active roll moment control, etc. In essence, the longitudinal, transverse and vertical dynamics of the vehicle are controlled from the perspective of tire mechanics, which has the disadvantage that the tire is easy to be saturated under limit conditions. This paper summarizes the control schemes of active aerodynamics to improve vehicle handling stability. When the vehicle is running at high speed, aerodynamics has a great influence on the vehicle, which greatly reduces the handling stability of the vehicle. Low handling stability may lead to unstable motion patterns. In order to improve the lateral stability, various control schemes considering relevant performance measures are designed and evaluated by numerical simulation or experimental methods. This paper focuses on the active aerodynamic control scheme, analyzes its characteristics, and determines the future research work.
Study on trim optimization for an oil tanker
Authors: Gao Xianjiao , Shi Shengzhe , Wang Mingzhen , Zhang Jiaxu
Published: August 2021

The purpose of this paper is to study the influence of trim on resistance performance for an oil tanker. First, the three-dimensional ship model, calculation basin and structural mesh were obtained. Commercial code of computational fluid dynamics was utilized to calculate the resistance of target ship under various trim conditions and drafts. Then, we compared the results calculated by numerical simulation with the towing tank test results to validate effectiveness of CFD method. Finally, influence of trim on ship resistance performance was analysed. It is concluded that this method can find the optimal trim value and provide practical advice for actual operation of the real ship. Consequently, it can be used to improve the efficiency of energy-saving and emission reduction, which provides a new direction for the development of green ships.
Analysis of the seakeeping performance for Unmanned Underwater vehicle using STAR-CCM+
Authors: Song Lihua , Wang Zhuo , Xu Yongze
Published: August 2021

In this paper, the seakeeping performance of unmanned underwater vehicle (AUV) under the action of transverse waves is calculated and analyzed, based on the commercial CFD software STAR-CCM+. The test data verifies the reliability of the numerical calculation method. The roll and heave response of the vehicle under different working conditions provide a reference for the overall parameter design of the unmanned underwater vehicle.
Visualization of Vortices Generated by Flapping Wing Device by Schlieren Method
Authors: Zeng Zhixiang , Ye Yongjie , Jiang Hongpei , Jiang Jiajun , Wang Zitao , Yuan Shijia , Deng Jianjie
Published: August 2021

Visualization and measurement of airflow detail structures is a difficult problem. In the past few years, high-speed DPIV has been used to capture the vortex structures on flapping robotic insect wings. Due to the inherent limitation in DPIV technique, important airflow activity in small scale vortical flow structures may be missed. In this paper, high-speed Schlieren photography was applied to vortical flow Visualization on a flapping robotic insect wings and then provided more information of vortical flow structures in detail. Based on the Schlieren image, quantified velocity vectors field was obtained by applying the variational optical flow method, which is able to be extending the potential applications to development flapping wings aircraft.
Hybrid Flow Control on Boundary Layer Ingestion Inlet
Authors: Shang Yinhui , Ge Changjie , Xiao Lianghua , Hu Xiao
Published: August 2021

For the boundary layer ingestion (BLI) inlet, how to control the flow is very important to improve the quality of the air flow at the outlet. In this paper, the research on the passive flow control is carried out by using rectangular straight spoiler blades, and the active flow control is carried out by using the blowing pipes. Finally, the effect of hybrid flow control is explored by combining the passive flow control device and the active flow control device. The results show that the spoiler blades can squeeze the low pressure zone to both sides of the outlet and reduce the area of the low pressure zone. The steady-state circumferential distortion coefficient of the outlet can be reduced by 66.7% by adopting the appropriate passive flow control scheme. The blowing rate of active flow control has a significant effect on the flow control effect. The optimal hybrid flow control scheme is obtained by optimization and the steady-state circumferential distortion coefficient can be reduced by 76.8% when the blowing flow rate is 0.67% of the inlet flow.
Analysis on flow induced vibration of main steam bypass valve in a nuclear power plant
Authors: Liu Junfeng , Chen Xudong , Han Chuangao , Ma Xiaolong , Wu Fangjie
Published: August 2021

Based on the fact that the main steam bypass system of a nuclear power plant vibrates violently during operation, the failure of couplings and other parts of the bypass valve occurs many times, which seriously affects the safe operation of the unit. According to bypass discharge system, and the bypass valve related drawings bypass valve fluid dynamics model is established, on the opening of the bypass valve interior flow field in CFD numerical simulation analysis, combining with the field vibration test results, for the opening of the bypass valve interior flow field in CFD numerical simulation analysis and vibration mechanism research, found that the structure of the piping system vibration and vortex shedding in the valve to inspire the chattering of the valve stem and even the axis of the main causes of fracture and valve is the high degrees of vortex-induced resonance is the main reason of the turbulent flow hood.