搜索到996篇“ METAMODEL“的相关文章
Contact Stress Reliability Analysis Model for Cylindrical Gear with Circular Arc Tooth Trace Based on an Improved Metamodel
2024年
Although there is currently no unified standard theoretical formula for calculating the contact stress of cylindrical gears with a circular arc tooth trace(referred to as CATT gear),a mathematical model for determining the contact stress of CATT gear is essential for studying how parameters affect its contact stress and building the contact stress limit state equation for contact stress reliability analysis.In this study,a mathematical relationship between design parameters and contact stress is formulated using the KrigingMetamodel.To enhance the model’s accuracy,we propose a new hybrid algorithm that merges the genetic algorithm with the Quantum Particle Swarm optimization algorithm,leveraging the strengths of each.Additionally,the“parental inheritance+self-learning”optimization model is used to fine-tune the KrigingMetamodel’s parameters.Following this,amathematicalmodel for calculating the contact stress of Variable Hyperbolic Circular-Arc-Tooth-Trace(VH-CATT)gears using the optimized Kriging model was developed.We then examined how different gear parameters affect the VH-CATT gears’contact stress.Our simulation results show:(1)Improvements in R2,RMSE,and RMAE.R2 rose from0.9852 to 0.9974(a 1.22%increase),nearing 1,suggesting the optimized Kriging Metamodel’s global error is minimized.Meanwhile,RMSE dropped from3.9210 to 1.6492,a decline of 57.94%.The global error of the GA-IQPSO-Kriging algorithm was also reduced,with RMAE decreasing by 58.69%from 0.1823 to 0.0753,showing the algorithm’s enhanced precision.In a comparison of ten experimental groups selected randomly,the GA-IQPSO-Kriging and FEM-based contact analysis methods were used to measure contact stress.Results revealed a maximum error of 12.11667 MPA,which represents 2.85%of the real value.(2)Several factors,including the pressure angle,tooth width,modulus,and tooth line radius,are inversely related to contact stress.The descending order of their impact on the contact stress is:tooth line radius>modulus>pressure angle>tooth width.(3)Com
Qi ZhangZhixin ChenYang WuGuoqi XiangGuang WenXuegang ZhangYongchun XieGuangchun Yang
关键词:METAMODEL
整合多学科理论的知识组织系统理论元模型研究
2024年
通过文献调研发现,目前大多数关于知识组织系统(knowledge organization systems,KOS)的研究以领域知识主题模型构建为主,鲜有从底层基础理论出发对KOS基本原理和运行机制进行揭示的相关研究,导致KOS的研究和应用缺乏底层方法的指导,难以保障质量及共享性。鉴于此,本文首先提出了KOS的语法、语义与语用三层框架模型,基于该模型对知识组织中知识语义的概念化过程及符号化表示的运行机制进行揭示;其次,聚焦于语义层,整合语义三角形理论、概念理论、符号学理论以及系统论等多学科理论,提出知识组织系统理论元模型,并提出用于构建领域KOS的方法与流程;最后,以石油井下作业领域的知识模型构建为研究对象,对理论元模型与KOS构建方法流程的可行性进行验证,以期为其他领域KOS的高质量、高效率构建提供新的科学方法。
翟可欣袁靖舒袁满
关键词:知识组织系统元模型语义构建
基于多项式混沌展开法的涡流无损检测高效元模型辅助探测概率的分析
2024年
探测概率对于量化涡流无损检测系统的检测能力非常重要。模型辅助探测概率的参数需要大量试验或仿真数据才可以确定,往往难以实现。应用基于退化核函数加速的边界元法的数值模型,提出使用基于普通最小二乘法的多项式混沌展开算法的元模型提升三维涡流无损检测问题探测概率的效率。通过有限截面线圈检测金属板面槽的算例,引入线圈位置和提离距离为不确定传播的参数,测试结果表明,该元模型预测的模型参数与基于退化核函数加速的边界元法物理模型计算的模型参数相对误差在1%以内,极大降低了所需的计算开销。
包扬仇家豪陈炯锐徐旻宣殷晓康宋继明
关键词:边界元法元模型
基于最佳预后元模型的颗粒污垢特性全局敏感性分析
2024年
通过敏感性分析可识别出重要变量和无关变量,有效筛选数据降低模型复杂程度,并辅助优化设计。以内置转子传热管内的颗粒污垢为研究对象,采用欧拉-欧拉模型和颗粒污垢模型进行数值实验获取训练数据空间,基于最佳预后元模型开展全局敏感性分析,定量比较了颗粒直径、颗粒浓度、入口流速和入口温度的影响程度。对颗粒污垢四种沉积速率分析表明,入口温度对扩散沉积和热泳沉积的影响最显著,总影响分别为65.4%、58.6%;颗粒直径对湍流泳沉积和重力沉积的影响最明显,总影响分别为53.9%、75.0%。在此基础上,进一步分析了沉积率和污垢热阻的总影响、主影响及交互影响。结果表明:颗粒直径对沉积率和污垢热阻的影响均最大,总影响分别为52.7%、60.2%,各输入变量对沉积率和污垢热阻的交互影响的和分别为59.7%、42.5%,且随着四个输入变量的增加,沉积率和污垢热阻均增大。颗粒直径是影响内置转子传热管颗粒污垢问题的首要因素,在换热器设计中应予以重点考虑,其次是流体温度与流速。
谢广烁张斯亮何松肖娟王斯民
关键词:结垢两相流数值模拟元模型
Probabilistic analysis of tunnel face seismic stability in layered rock masses using Polynomial Chaos Kriging metamodel被引量:2
2024年
Face stability is an essential issue in tunnel design and construction.Layered rock masses are typical and ubiquitous;uncertainties in rock properties always exist.In view of this,a comprehensive method,which combines the Upper bound Limit analysis of Tunnel face stability,the Polynomial Chaos Kriging,the Monte-Carlo Simulation and Analysis of Covariance method(ULT-PCK-MA),is proposed to investigate the seismic stability of tunnel faces.A two-dimensional analytical model of ULT is developed to evaluate the virtual support force based on the upper bound limit analysis.An efficient probabilistic analysis method PCK-MA based on the adaptive Polynomial Chaos Kriging metamodel is then implemented to investigate the parameter uncertainty effects.Ten input parameters,including geological strength indices,uniaxial compressive strengths and constants for three rock formations,and the horizontal seismic coefficients,are treated as random variables.The effects of these parameter uncertainties on the failure probability and sensitivity indices are discussed.In addition,the effects of weak layer position,the middle layer thickness and quality,the tunnel diameter,the parameters correlation,and the seismic loadings are investigated,respectively.The results show that the layer distributions significantly influence the tunnel face probabilistic stability,particularly when the weak rock is present in the bottom layer.The efficiency of the proposed ULT-PCK-MA is validated,which is expected to facilitate the engineering design and construction.
Jianhong ManTingting ZhangHongwei HuangDaniel Dias
A metamodel for heritage-based urban recovery
2023年
Purpose:The purpose of this paper is to discuss the potential transfer of a metamodel for heritage-based urban development(HBUD)in a postcrisis urban recovery scenario.Design/methodology/approach:After an introduction to the feld of cultural heritage as a resource for urban development,the research question is elaborated,and the current understanding of urban heritage is explored.The use of the metamodel in a postcrisis urban recovery setting is described as a potential solution.The proposed metamodel is introduced along with the grounded theory and design research methodology through which it was developed.The specifc qualities of metamodels and how they can contribute to the proposed use are highlighted.The scenario is then developed further,and specifc ways in which the metamodel could contribute are elaborated.Finally,the metamodel is compared to other methods,such as the historic urban landscape(HUL)approach,and the limitations are discussed.Findings:The metamodel can potentially be used in a postcrisis urban recovery scenario.The metamodel cannot be used directly,owing to the nature of metamodels;however,it can be transferred to a specifc context and help to structure successful heritage-based urban recovery(HBUR)processes.Practical limitations/implications:One limitation is that it can be difcult to understand the diferences between models and metamodels.Only with a comprehensive understanding of the nature of metamodels can this metamodel be applied,for example,to select appropriate models for HBUR.The metamodel can help to ensure that all relevant‘elements’are part of the processes designed for HBUR and emphasise the need for thorough planning,or scoping,of such processes.Originality/value:Metamodelling has not previously been used for HBUD or HBUR.
Christer GustafssonMatthias Ripp
关键词:RECOVERYRESILIENCEMETAMODELCONSERVATION
A point cloud deep neural network metamodel method for aerodynamic prediction被引量:1
2023年
Aiming to reduce the high expense of 3-Dimensional(3D)aerodynamics numerical sim-ulations and overcome the limitations of the traditional parametric learning methods,a point cloud deep learning non-parametric metamodel method is proposed in this paper.The 3D geometric data,corresponding to the object boundaries,are chosen as point clouds and a deep learning neural net-work metamodel fed by the point clouds is further established based on the PointNet architecture.This network can learn an end-to-end mapping between spatial positions of the object surface and CFD numerical quantities.With the proposed aerodynamic metamodel approach,the point clouds are constructed by collecting the coordinates of grid vertices on the object surface in a CFD domain,which can maintain the boundary smoothness and allow the network to detect small changes between geometries.Moreover,the point clouds are easily accessible from 3D sensors.The point cloud deep learning neural network,which employs re-sampling technique,the spatial transformer network and the fully connected layer,is developed to predict the aerodynamic char-acteristics of 3D geometry.The effectiveness of the proposed metamodel method is further verified by aerodynamic prediction and robust shape optimization of the ONERA M6 wing.The results show that the proposed method can achieve more satisfactory agreement with the experimental measurements compared to the parametric-learning-based deep neural network.
Fenfen XIONGLi ZHANGXiao HUChengkun REN
关键词:METAMODEL
A metamodel for heritage-based urban development:enabling sustainable growth through urban cultural heritage,by Matthias Ripp.Springer Cham,2022.209pp.ISBN9783031082375
2023年
1Introduction 1.1 What is the book a bout?This article provides a review on the new publication of Matthias Ripp titled Meta-model for Heritage-based Urban Development:Enabling SustainableGrowth through Urban Cultural Heritage released by Springer in 2022.The subtitle is an inspirational,hope-giving,new perspective to heritage studies,if one puts aside the growthbased world economic systems towards development.
Yonca Erkan
关键词:HERITAGESUSTAINABLE
标准文档结构化 元模型 第2部分:技术指标
本文件给出了标准中要求条款的性能指标描述的结构化元模型,规定了元模型的元素属性描述。本文件适用于标准文档结构化开发与应用。本文件不适用于标准中要求条款的功能指标的结构化描述。
施建马星晓章建方卢艳芳李景曹平计雄飞李鹏超陈绪超刘彬彬邬雨笋李振良王磊陈亚军安华娟杜琦杰马中骏吴珊朱培武
标准文档结构化 元模型 第1部分:全文
本文件从三个维度描述了标准文档结构化的全文元模型,即层次元模型、要素表述形式元模型、内容要素元模型,规定了各维度的关系及元模型元素的属性。本文件适用于标准文档结构化信息化开发和应用。
施建马星晓章建方卢艳芳李景曹平计雄飞李武贤陈亚红邬雨笋刘彬彬李振良陈亚军王磊安华娟杜琦杰马中骏朱培武

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