WIT transactions on modelling and simulation最新文献

Finite Element Modeling Aspects of Buried Large Diameter Steel Pipe–Butterfly Valve Interaction 埋地大直径钢管-蝶阀相互作用的有限元建模

WIT transactions on modelling and simulation Pub Date : 2023-11-10 DOI: 10.3390/modelling4040031

Ashraf Mohammed Daradkeh, Himan Hojat Jalali

引用次数: 0

The Data Assimilation Approach in a Multilayered Uncertainty Space 多层不确定性空间中的数据同化方法

WIT transactions on modelling and simulation Pub Date : 2023-11-08 DOI: 10.3390/modelling4040030

Martin Drieschner, Clemens Herrmann, Yuri Petryna

{"title":"The Data Assimilation Approach in a Multilayered Uncertainty Space","authors":"Martin Drieschner, Clemens Herrmann, Yuri Petryna","doi":"10.3390/modelling4040030","DOIUrl":"https://doi.org/10.3390/modelling4040030","url":null,"abstract":"The simultaneous consideration of a numerical model and of different observations can be achieved using data-assimilation methods. In this contribution, the ensemble Kalman filter (EnKF) is applied to obtain the system-state development and also an estimation of unknown model parameters. An extension of the Kalman filter used is presented for the case of uncertain model parameters, which should not or cannot be estimated due to a lack of necessary measurements. It is shown that incorrectly assumed probability density functions for present uncertainties adversely affect the model parameter to be estimated. Therefore, the problem is embedded in a multilayered uncertainty space consisting of the stochastic space, the interval space, and the fuzzy space. Then, we propose classifying all present uncertainties into aleatory and epistemic ones. Aleatorically uncertain parameters can be used directly within the EnKF without an increase in computational costs and without the necessity of additional methods for the output evaluation. Epistemically uncertain parameters cannot be integrated into the classical EnKF procedure, so a multilayered uncertainty space is defined, leading to inevitable higher computational costs. Various possibilities for uncertainty quantification based on probability and possibility theory are shown, and the influence on the results is analyzed in an academic example. Here, uncertainties in the initial conditions are of less importance compared to uncertainties in system parameters that continuously influence the system state and the model parameter estimation. Finally, the proposed extension using a multilayered uncertainty space is applied on a multi-degree-of-freedom (MDOF) laboratory structure: a beam made of stainless steel with synthetic data or real measured data of vertical accelerations. Young’s modulus as a model parameter can be estimated in a reasonable range, independently of the measurement data generation.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"49 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135430512","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

Supply-Driven Analysis for a Continuous Water Supply Network Based on a Pressure-Based Outflow at the House Outlets under Peak Withdrawal Scenarios 峰值调水情景下基于户用出水压力的连续供水网络供给驱动分析

WIT transactions on modelling and simulation Pub Date : 2023-11-08 DOI: 10.3390/modelling4040029

Conety Ravi Suribabu, Neelakantan Renganathan Thurvas, Perumal Sivakumar

引用次数: 0

Reduced-Dimension Surrogate Modeling to Characterize the Damage Tolerance of Composite/Metal Structures 表征复合材料/金属结构损伤容限的降维替代模型

WIT transactions on modelling and simulation Pub Date : 2023-11-07 DOI: 10.3390/modelling4040028

Corey Arndt, Cody Crusenberry, Bozhi Heng, Rochelle Butler, Stephanie TerMaath

{"title":"Reduced-Dimension Surrogate Modeling to Characterize the Damage Tolerance of Composite/Metal Structures","authors":"Corey Arndt, Cody Crusenberry, Bozhi Heng, Rochelle Butler, Stephanie TerMaath","doi":"10.3390/modelling4040028","DOIUrl":"https://doi.org/10.3390/modelling4040028","url":null,"abstract":"Complex engineering models are typically computationally demanding and defined by a high-dimensional parameter space challenging the comprehensive exploration of parameter effects and design optimization. To overcome this curse of dimensionality and to minimize computational resource requirements, this research demonstrates a user-friendly approach to formulating a reduced-dimension surrogate model that represents a high-dimensional, high-fidelity source model. This approach was developed specifically for a non-expert using commercially available tools. In this approach, the complex physical behavior of the high-fidelity source model is separated into individual, interacting physical behaviors. A separate reduced-dimension surrogate model is created for each behavior and then all are summed to formulate the reduced-dimension surrogate model representing the source model. In addition to a substantial reduction in computational resources and comparable accuracy, this method also provides a characterization of each individual behavior providing additional insight into the source model behavior. The approach encompasses experimental testing, finite element analysis, surrogate modeling, and sensitivity analysis and is demonstrated by formulating a reduced-dimension surrogate model for the damage tolerance of an aluminum plate reinforced with a co-cured bonded E-glass/epoxy composite laminate under four-point bending. It is concluded that this problem is difficult to characterize and breaking the problem into interacting mechanisms leads to improved information on influential parameters and efficient reduced-dimension surrogate modeling. The disbond damage at the interface between the resin and metal proved the most difficult mechanism for reduced-dimension surrogate modeling as it is only engaged in a small subspace of the full parameter space. A binary function was successful in engaging this damage mechanism when applicable based on the values of the most influential parameters.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"75 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135433125","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: 1

Autoignition Problem in Homogeneous Combustion Systems: GQL versus QSSA Combined with DRG 均相燃烧系统的自燃问题:GQL与QSSA结合DRG

WIT transactions on modelling and simulation Pub Date : 2023-10-25 DOI: 10.3390/modelling4040027

Chunkan Yu, Sudhi Shashidharan, Shuyang Wu, Felipe Minuzzi, Viatcheslav Bykov

{"title":"Autoignition Problem in Homogeneous Combustion Systems: GQL versus QSSA Combined with DRG","authors":"Chunkan Yu, Sudhi Shashidharan, Shuyang Wu, Felipe Minuzzi, Viatcheslav Bykov","doi":"10.3390/modelling4040027","DOIUrl":"https://doi.org/10.3390/modelling4040027","url":null,"abstract":"The global quasi-linearization (GQL) is used as a method to study and to reduce the complexity of mathematical models of mechanisms of chemical kinetics. Similar to standard methodologies, such as the quasi-steady-state assumption (QSSA), the GQL method defines the fast and slow invariant subspaces and uses slow manifolds to gain a reduced representation. It does not require empirical inputs and is based on the eigenvalue and eigenvector decomposition of a linear map approximating the nonlinear vector field of the original system. In the present work, the GQL-based slow/fast decomposition is applied for different combustion systems. The results are compared with the standard QSSA approach. For this, an implicit implementation strategy described by differential algebraic equations (DAEs) systems is suggested and used, which allows for treating both approaches within the same computational framework. Hydrogen–air (with 9 species) and ethanol–air (with 57 species) combustion systems are considered representative examples to illustrate and verify the GQL. The results show that 4D GQL for hydrogen–air and 14D GQL ethanol–air slow manifolds outperform the standard QSSA approach based on a DAE-based reduced computation model.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"9 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112287","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

Experimental Validation of Finite Element Models for Open-to-CHS Column Connections 开放- chs柱连接有限元模型的试验验证

WIT transactions on modelling and simulation Pub Date : 2023-10-16 DOI: 10.3390/modelling4040026

Rajarshi Das, Alper Kanyilmaz, Herve Degee

{"title":"Experimental Validation of Finite Element Models for Open-to-CHS Column Connections","authors":"Rajarshi Das, Alper Kanyilmaz, Herve Degee","doi":"10.3390/modelling4040026","DOIUrl":"https://doi.org/10.3390/modelling4040026","url":null,"abstract":"The conventional ways to construct an open-to-circular hollow section (CHS) connection are either to directly weld the open section to the CHS column wall or to use local stiffeners (e.g., diaphragms) and gusset plates to connect the two structural components. These construction methods often subject the CHS to severe local distortions and/or require high welding quantities, hindering the real-life application of hollow sections. To overcome such difficulties, this study proposes two types of moment-resisting “passing-through” connection configurations, developed within the European research project “LASTEICON”. These configurations consist of main beams connected to the CHS column via either an I-section or individual steel plates passing through the CHS column. The passing-through system is implemented using laser cut and weld technology and efficiently avoids excessive use of stiffening plates, local damages on the CHS wall and premature flange failures. The proposed configurations are investigated experimentally and numerically under two different load cases in order to characterize their structural behaviour. Finite element models have been developed and calibrated with respect to the experimental force–displacement behaviour of the connections as well as their observed failure modes. The efficiency, benefits, and limitations of the modelling approach were discussed through a detailed comparison study between the experimental and numerical results.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136113124","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

Machine Learning in the Stochastic Analysis of Slope Stability: A State-of-the-Art Review 机器学习在边坡稳定性随机分析中的研究进展

WIT transactions on modelling and simulation Pub Date : 2023-10-01 DOI: 10.3390/modelling4040025

Haoding Xu, Xuzhen He, Feng Shan, Gang Niu, Daichao Sheng

引用次数: 0

Li+ Separation from Multi-Ionic Mixtures by Nanofiltration Membranes: Experiments and Modeling 纳滤膜从多离子混合物中分离Li+:实验与模拟

WIT transactions on modelling and simulation Pub Date : 2023-09-20 DOI: 10.3390/modelling4030024

Tobias Hubach, Marcel Pillath, Clemens Knaup, Stefan Schlüter, Christoph Held

{"title":"Li+ Separation from Multi-Ionic Mixtures by Nanofiltration Membranes: Experiments and Modeling","authors":"Tobias Hubach, Marcel Pillath, Clemens Knaup, Stefan Schlüter, Christoph Held","doi":"10.3390/modelling4030024","DOIUrl":"https://doi.org/10.3390/modelling4030024","url":null,"abstract":"Aqueous sources like salt lake brines and seawater are the most abundant source for lithium ions and might contribute to the growing demand for lithium for energy storage. By coupling with the increasingly relevant reverse osmosis systems, nanofiltration can provide a promising process alternative to conventional methods such as water evaporation and salt precipitation from ores or brines for this purpose. One possible model for nanofiltration is the solution-diffusion-electromigration model (SDEM). First, the model was parametrized by determining the permeances from simple electrolyte mixtures containing two salts. Then, the SDEM was used to predict the rejections of complex multi-electrolyte solutions that mimic seawater and reverse osmosis brine, without fitting additional parameters to experimental data of this complex mixture. This allowed predicting ion rejections satisfactorily. Negative rejections due to spontaneously generated electric fields in the membrane could also be qualitatively described. In summary, this SDEM modeling can provide an important contribution to the purification of Li+ from aqueous sources.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136373761","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

Investigating Ice Loads on Subsea Pipelines with Cohesive Zone Model in Abaqus 基于Abaqus黏聚区模型的海底管道冰荷载研究

WIT transactions on modelling and simulation Pub Date : 2023-09-14 DOI: 10.3390/modelling4030023

Igor Gribanov, Rocky Taylor, Jan Thijssen, Mark Fuglem

引用次数: 0

Modelling and Simulating the Digital Measuring Twin Based on CMM 基于三坐标测量机的数字测量双体建模与仿真

WIT transactions on modelling and simulation Pub Date : 2023-08-17 DOI: 10.3390/modelling4030022

Miladin A. Marjanovic, S. Stojadinovic, S. Zivanovic

{"title":"Modelling and Simulating the Digital Measuring Twin Based on CMM","authors":"Miladin A. Marjanovic, S. Stojadinovic, S. Zivanovic","doi":"10.3390/modelling4030022","DOIUrl":"https://doi.org/10.3390/modelling4030022","url":null,"abstract":"In order to perform the inspection planning process on the coordinate measuring machine (CMM), it is necessary to model the measuring system with workpiece, CMM and fixture. The metrological analysis of the workpiece is then conducted, followed by the creation of a measurement program for simulation on a virtual measuring machine in a CAD environment. This paper presents the modelling and simulation of a virtual measuring system based on a real CMM using PTC Creo Parametric 5.0 software. The simulation involved programming the measuring path and generating a DMIS (*.ncl) file, which represents the standard modelled types of tolerance. The analysis of the metrology of the measuring part for the given forms of tolerance (location, perpendicularity, flatness, etc.) was performed. The components of the CMM and the assembly with defined kinematic connections are also modelled. Following the simulation and generation of the output DMIS file in PTC Creo using the virtual CMM, the real CMM was programmed and used for actual measurements. Subsequently, a measurement report was generated. The main result of this paper is the modelling of an offline Digital Measuring Twin (DMT) based on the DMIS file.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90421538","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