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Effect of Multi-rough Element Combination on Hypersonic Boundary Layer 多槽元素组合对高超声速边界层的影响
Advances in Engineering Technology Research Pub Date : 2024-01-24 DOI: 10.56028/aetr.9.1.465.2024
Zhiyi Zhao, Dalei Zhu, Yaodong Yang, Xiaojun Tang, Liang Xin, Guobao Dai, Ao Li
{"title":"Effect of Multi-rough Element Combination on Hypersonic Boundary Layer","authors":"Zhiyi Zhao, Dalei Zhu, Yaodong Yang, Xiaojun Tang, Liang Xin, Guobao Dai, Ao Li","doi":"10.56028/aetr.9.1.465.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.465.2024","url":null,"abstract":"In this paper, the influence of multi-rough element combination controlled by cubic polynomial on the flow field of hypersonic blunt wedge is studied by direct numerical simulation. The influence mechanism of six continuous rough element combinations on the flow parameters in the boundary layer is analyzed in depth, and compared with the influence of double rough elements. It is concluded that the first rough element of the continuous rough element combination has a great influence on the flow field pressure, and the influence of the latter rough element decreases in turn. The combination of six continuous rough elements on the wall can better suppress the incoming flow heating and reduce the wall friction compared with the double rough elements. Compared with smooth wall, wall friction and incoming flow heating are reduced by 25.23 % and 2.69 %, respectively.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"23 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140497733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-objective Agent Model for XGBoost Controlled VFTO Simulator Based on Bayesian Optimization Algorithm 基于贝叶斯优化算法的 XGBoost 控制 VFTO 模拟器多目标代理模型
Advances in Engineering Technology Research Pub Date : 2024-01-24 DOI: 10.56028/aetr.9.1.484.2024
Kejie Li, Longlong Li
{"title":"Multi-objective Agent Model for XGBoost Controlled VFTO Simulator Based on Bayesian Optimization Algorithm","authors":"Kejie Li, Longlong Li","doi":"10.56028/aetr.9.1.484.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.484.2024","url":null,"abstract":"VFTO generated from GIS may cause interference and damage to terminal equipment on the primary and secondary sides, but experimental measures to evaluate the affected equipment and electromagnetic effects of the equipment through actual measurements are quite limited, so it is desired to build a VFTO simulator in the laboratory for experimental research and laboratory testing. Most of the current researches are conducted by building a true-type experimental platform for VFTO simulation, but this method has the disadvantages of large footprint, high cost and the scope of application can only simulate VFTO in a certain situation. Therefore, this paper establishes a broadband circuit model considering the pulse generator and the frequency domain equivalent transmission line model, and introduces the machine learning algorithm XGBoost to fit the agent model of the functional relationship between the design target and the structural parameters by establishing the sample data of the input circuit parameters and the output frequency waveform characteristics of the simulator, which is capable of dynamically adjusting the input parameters based on the waveform characteristics according to the changes of the target waveform, and ensures that a controllable waveform is obtained accurately in the laboratory the accuracy of obtaining controllable waveforms, thus realizing the output of controllable analog VFTO waveforms by changing the parameters of circuit components. Finally, the Bayesian optimization process is used for the hyper-parameter optimization of the XGBoost model, which has a fast convergence speed, and the characteristics of the output model are compared and analyzed, which verifies the feasibility and superiority of the proposed agent model as well as the multi-objective optimization method.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140497680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of Air Supply Conditions for Large Space Radiant Air Conditioning Based on Response Surface Analysis 基于响应面分析的大空间辐射空调送风条件优化
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.384.2024
Yijiang Chen, Jun Zhang
{"title":"Optimization of Air Supply Conditions for Large Space Radiant Air Conditioning Based on Response Surface Analysis","authors":"Yijiang Chen, Jun Zhang","doi":"10.56028/aetr.9.1.384.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.384.2024","url":null,"abstract":"In large spaces, the comfort control of radiant air conditioning systems still has deficiencies. Mainly reliant on traditional parameter control methods, the interaction effects of diverse operating conditions are not taken into account, and the control results are still in need of optimization. To improve indoor air conditioning comfort control and address gaps in existing research, the response surface analysis method combined with numerical simulation is applied to determine the optimal air supply conditions for large-space radiant air conditioning. With the real model as a reference, simulations are carried out in Airpak, selecting four factors: supply air temperature, supply air humidity, air supply volume, and air supply angle for the response surface design. Discussions on interaction effects are carried out based on the simulated results of various scheme designs, determining eight groups of air supply schemes with the highest comfort. The research concludes that the response surface analysis method, considering the interactive effects of impacting factors, can lead to the strategy of high comfort and reasonable air supply conditions. Additionally, a set of recommendations are proposed for future practical application and promotion.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"26 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140504229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Topological optimization design for support structure under multiple loading conditions 多载荷条件下支撑结构的拓扑优化设计
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.410.2024
Jiayong Yan, Cunyi Wang, Yuping Chen, Lixin Zhang, Qingxin Cui
{"title":"Topological optimization design for support structure under multiple loading conditions","authors":"Jiayong Yan, Cunyi Wang, Yuping Chen, Lixin Zhang, Qingxin Cui","doi":"10.56028/aetr.9.1.410.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.410.2024","url":null,"abstract":"In view of the lightweight and high stiffness requirements of a certain type of spacecraft support, combined with the special performance and environment of the support, topology optimization technology is introduced into the optimal design of the support structure in the space field. The topology optimization and design of the support are carried out with the stiffness as the objective function and the quality as the constraint condition, and the design of \"space hugging configuration\" is proposed, and the simulation verification and experimental verification are carried out. Firstly, different load conditions of the support were analyzed and studied. Secondly, the initial model was established based on the relative position relationship between the support and the mounting surface of the loaded equipment. Finally, a design method of the support structure was established based on the combination of topology optimization under multi-load conditions and size optimization considering the influence of strength. The stiffness and strength of the optimized structure were checked under multiple load conditions, and the fundamental frequency was 2.05 times of the index requirement. The maximum response stress is lower than the yield limit of the material used, which meets the strength requirement. Finally, the vibration test is carried out to verify the support. After the test is completed, the position accuracy of the support interface meets the requirements of the index. The obtained bracket has high structural stability, meets the high performance requirements of the load equipment, verifies the feasibility of the topology optimization method, and provides an effective method for the design of lightweight high-stiffness structures.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140504260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Review of Transportation Aviation Operational Safety Research in China and the United States 中美两国运输航空运行安全研究综述
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.392.2024
Dan Li, Lin Wei
{"title":"A Review of Transportation Aviation Operational Safety Research in China and the United States","authors":"Dan Li, Lin Wei","doi":"10.56028/aetr.9.1.392.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.392.2024","url":null,"abstract":"According to relevant data from ICAO and China's civil aviation, the global aviation industry is in a gradual recovery phase. As the world's first and second largest aviation markets, China and the U.S. have extensive cooperation in a number of fields such as aircraft and airborne equipment manufacturing, pilot training, air traffic management, energy conservation and emission reduction. Working together to address challenges and accelerate economic recovery is the main theme of the world today, and is a common priority for the global civil aviation industry. China and the United States have the responsibility to cooperate in all aspects under the framework of ICAO's Global Development Initiative and play a greater role in the recovery and development of global civil aviation.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"41 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140504403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of deformation law of an airport foundation pit monitoring in loess area 黄土地区机场基坑监测变形规律分析
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.417.2024
Shuli Guo, Kongfeng Wei, Weiqiang Wu
{"title":"Analysis of deformation law of an airport foundation pit monitoring in loess area","authors":"Shuli Guo, Kongfeng Wei, Weiqiang Wu","doi":"10.56028/aetr.9.1.417.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.417.2024","url":null,"abstract":"This paper takes an airport foundation pit project in northwest loess area as the research object, and introduces the key method technology of support, construction and monitoring of this foundation pit project. The scope of this foundation pit project is widely distributed, there are no buildings in the surrounding area, and there is less restriction on the construction space, so the GRF01 green assembled support method of Slope release with soil nail wall is adopted, which controls the deformation of the foundation pit well and at the same time, plays the role of green environmental protection and reduces the cost. The analysis of the pit monitoring data shows that the pit engineering support design scheme effectively controls the deformation of the pit, and all monitoring data did not reach the alarm value, which ensures the safety of pit excavation and in-pit operation, and achieves the dual goals of economy and environmental protection. It can provide reference for the design and construction of similar large-scale foundation pit excavation and support in loess area.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"33 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140503712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and application of VRGIS 3D simulation system for power grid soil and water conservation 电网水土保持 VRGIS 3D 仿真系统的设计与应用
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.424.2024
Lei Yu, Songyang Zhang, Jinjin Shang, Gaofeng Su, Zhen Sun
{"title":"Design and application of VRGIS 3D simulation system for power grid soil and water conservation","authors":"Lei Yu, Songyang Zhang, Jinjin Shang, Gaofeng Su, Zhen Sun","doi":"10.56028/aetr.9.1.424.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.424.2024","url":null,"abstract":"Under the development trend of economic globalization, the rapid development of social economy and science and technology provides a new direction for the research of soil and water conservation technology in power grid. As an organic combination of geographic information system and virtual reality technology, VRGIS not only continues the basic functions of traditional spatial data storage and processing, but also has the unreal interface of virtual reality technology, building a new platform for the construction and management of smart grid in the new era. Therefore, after understanding the research status of smart grid construction, this paper mainly studies the design and application measures of 3D simulation system for water and soil conservation of power grid according to the application advantages of VRGIS technology in smart grid management, so as to provide an effective basis for the development of smart grid.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"22 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140504145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Wear Damage of Anchor Chain under Different Load Modes 不同载荷模式下锚链的磨损研究
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.448.2024
Yugang Li, Jingjie Chen, Jiachen Li, Bin Wang, Bo Ten
{"title":"Research on Wear Damage of Anchor Chain under Different Load Modes","authors":"Yugang Li, Jingjie Chen, Jiachen Li, Bin Wang, Bo Ten","doi":"10.56028/aetr.9.1.448.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.448.2024","url":null,"abstract":"In the marine environment, mooring anchor chains bear complex loads such as axial tension and out of plane bending. These loads cause wear and corrosion damage to the anchor chain, reducing its fatigue strength, and even leading to fatigue fracture. The inspection load applied to the anchor chain before leaving the factory will generate residual stress, which will affect the stress characteristics and fatigue life of the anchor chain during service. This article aims to obtain the residual stress generated by the test load on the anchor chain through numerical simulation, and explore the impact of the test load residual stress on the stress characteristics and wear performance of the anchor chain; Analyze the stress and contact characteristics of anchor chains under different bending angles and wear depths, and obtain the locations where fatigue damage is prone to occur in the later stage of anchor chain wear.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"67 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140503302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Residence Time and Carrier Gas on the Dehydrogenation of n-Hexane over Alumina-supported Chromium Catalyst 停留时间和载气对氧化铝支撑铬催化剂上正己烷脱氢反应的影响
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.377.2024
Xiuyi Li, Chunyi Li
{"title":"Effect of Residence Time and Carrier Gas on the Dehydrogenation of n-Hexane over Alumina-supported Chromium Catalyst","authors":"Xiuyi Li, Chunyi Li","doi":"10.56028/aetr.9.1.377.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.377.2024","url":null,"abstract":"CrOx/γ-Al2O3 catalyst was prepared by incipient wetness impregnation method, and the influence of residence time and carrier gas on the dehydrogenation of n-hexane were studied. It is found that n-hexane dehydrogenation over CrOx/γ-Al2O3 catalyst with H2 as carrier gas exhibits totally different catalytic behaviors with that of diluting n-hexane with N2. When diluting feed with N2, the selectivity to dehydrogenation product is promoted while the cracking reaction is exhibited with reducing residence time. However, the selectivity to dehydrogenation product is significantly decreased while the isomerization of n-hexane is promoted when using H2 as carrier gas. It is proposed that H2 undergoes dissociation on the dehydrogenation active site, and further facilitates the olefinic dehydrogenation products to form carbocation, which performing isomerization reaction on the acid site on the γ-Al2O3 surface. Therefore, the isomerization of n-hexane is promoted in cost of the selectivity to dehydrogenation product when using H2 as carrier gas.  ","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"65 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140503571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Intelligent Technology Assessment of High-Speed Railway Based on Knowledge Graphs 基于知识图谱的高速铁路智能技术评估
Advances in Engineering Technology Research Pub Date : 2024-01-18 DOI: 10.56028/aetr.9.1.396.2024
Chenchen Liu, Hongwei Wang, Lin Wang
{"title":"Intelligent Technology Assessment of High-Speed Railway Based on Knowledge Graphs","authors":"Chenchen Liu, Hongwei Wang, Lin Wang","doi":"10.56028/aetr.9.1.396.2024","DOIUrl":"https://doi.org/10.56028/aetr.9.1.396.2024","url":null,"abstract":"This paper introduces an intelligent technology assessment framework for high-speed railways based on a knowledge graph approach. We employ rule-based knowledge extraction algorithms and a Bert-BiLSTM-CRF model for entity extraction from technical texts. Subsequently, we establish relationships among various entities, constructing a knowledge graph specific to high-peed railways. The knowledge graph is stored in a Neo4j graph database in triple format. Furthermore, we establish a comprehensive evaluation metric system, integrating knowledge graph insights to assess the utility of enabling technologies. We employ the CRITIC weighting method to calculate the value assessment results for target technologies. Simulation results indicate that the training results for word segmentation and sentence splitting are favorable, and the Bert-BiLSTM-CRF model achieves convergence in accuracy, recall, and F1 score after 30 iterations. The technical assessment results in this paper align closely with the actual technological value assessment.","PeriodicalId":355471,"journal":{"name":"Advances in Engineering Technology Research","volume":"238 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140504694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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