WIT transactions on modelling and simulation最新文献_第4页

Damage Evolution Prediction during 2D Scale-Model Tests of a Rubble-Mound Breakwater: A Case Study of Ericeira’s Breakwater 碎石丘防波堤二维比例模型试验损伤演化预测——以Ericeira防波堤为例

WIT transactions on modelling and simulation Pub Date : 2022-12-20 DOI: 10.3390/modelling4010001

R. Lemos, João Santos, C. Fortes

{"title":"Damage Evolution Prediction during 2D Scale-Model Tests of a Rubble-Mound Breakwater: A Case Study of Ericeira’s Breakwater","authors":"R. Lemos, João Santos, C. Fortes","doi":"10.3390/modelling4010001","DOIUrl":"https://doi.org/10.3390/modelling4010001","url":null,"abstract":"Melby presents a formula to predict damage evolution in rubble-mound breakwaters whose armour layer is made of rock, based on the erosion measured in scale-model tests and the characteristics of the incident sea waves in such tests. However, this formula is only valid for armour layers made of rock and for the range of tested sea states. The present work aims to show how the Melby methodology can be used to establish a similar formula for the armour layer damage evolution in a rubble-mound breakwater where tetrapods are employed. For that, a long-duration test series is conducted with a 1:50 scale model of the quay section of the Ericeira Harbour breakwater. The eroded volume of the armour layer was measured using a Kinect position sensor. The damage parameter values measured in the experiments are lower than those predicted by the formulation for rock armour layers. New and coefficients for the Melby formula for the tested armour layer were established based on the minimum root mean square error between the measured and the predicted damage. This work shows also that it is possible to assess the damage evolution in scale-model tests with rubble-mound breakwaters by computing the eroded volume and subsequently, the dimensionless damage parameter based on the equivalent removed armour units.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80448698","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

Empirical Modeling of Transverse Displacements of Single-Sided Transversely Cracked Prismatic Tension Beams 单侧横裂棱柱张拉梁横向位移的经验模拟

WIT transactions on modelling and simulation Pub Date : 2022-12-16 DOI: 10.3390/modelling3040031

M. Skrinar

{"title":"Empirical Modeling of Transverse Displacements of Single-Sided Transversely Cracked Prismatic Tension Beams","authors":"M. Skrinar","doi":"10.3390/modelling3040031","DOIUrl":"https://doi.org/10.3390/modelling3040031","url":null,"abstract":"While the effects of axial compression on beams have long been known, the effect of tensile axial loads on one-sided transversely cracked beams is less known. The crack namely shifts the position of the resultant of the axial normal stresses deeper into the uncracked part of the cross-section, and the crack tends to open, causing a transverse displacement. Therefore, this paper focuses on empirical modeling of the considered phenomenon for slender prismatic beams in order to establish a suitable 1D computational model based on detailed 3D FE mesh results. This goal can be achieved through the already established simplified model, where the crack is represented by an internal hinge endowed with a rotational spring. Several analyses of various beams differing in geometry, crack locations, and boundary conditions were executed by implementing 3D FE meshes to establish the appropriate model’s bending governing differential equation. After that, the corresponding parameter definitions were calibrated from the database of 3D FE models. By redefining the model’s input parameters, a suitable solution is achieved, offering a good balance between the results’ accuracy and the required computational effort. The functionality of the newly obtained solutions was verified through some comparative case studies that supplement the derivations.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"165 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80395324","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

Mathematical Modeling of Electrical Circuits and Practical Works of Increasing Difficulty with Classical Spreadsheet Software 电路数学建模与经典电子表格软件难度增加的实际工作

WIT transactions on modelling and simulation Pub Date : 2022-11-17 DOI: 10.3390/modelling3040029

C. Sauvey

引用次数: 3

Efficient Hydrodynamic Modelling of Urban Stormwater Systems for Real-Time Applications 实时应用的城市雨水系统的高效水动力学建模

WIT transactions on modelling and simulation Pub Date : 2022-11-17 DOI: 10.3390/modelling3040030

H. Baumann, N. H. Ravn, A. Schaum

{"title":"Efficient Hydrodynamic Modelling of Urban Stormwater Systems for Real-Time Applications","authors":"H. Baumann, N. H. Ravn, A. Schaum","doi":"10.3390/modelling3040030","DOIUrl":"https://doi.org/10.3390/modelling3040030","url":null,"abstract":"Urban water drainage systems represent complex networks with nonlinear dynamics and different types of interactions. This yields an involved modeling problem for which different off-line simulation approaches are available. Nevertheless, these approaches cannot be used for real-time simulations, i.e., running in parallel to weather now- and forecasts and enabling the monitoring and automatic control of urban water drainage systems. Alternative approaches, used commonly for automation purposes, involve parameterized linear delay systems, which can be used in real-time but lack the necessary level of detail, which, in particular, is required for adequate flood risk prognostics. Given this setup, in the present paper, an approach for the effective modeling of detailed water drainage systems for real-time applications implemented with the open-source Storm Water Management Model (SWMM) software is addressed and exemplified for a part of the water drainage system of the city of Flensburg in northern Germany. Additionally, a freely available early-warning system prototype is introduced and used to combine weather forcast information on a 2-h prediction horizon with the developed model and available measurements. This prototype is subsequently used for data assimilation using the ensemble Kalman filter (EnKF) for the considered area in Flensburg.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87154296","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

Numerical Analysis of the Radial Load, Pressure and Velocity Fields of a Single Blade Pump 单叶片泵径向负荷、压力和速度场的数值分析

WIT transactions on modelling and simulation Pub Date : 2022-10-25 DOI: 10.3390/modelling3040028

Dávid Bleho, R. Olšiak, B. Knížat, Marek Mlkvik

引用次数: 0

Derivation of Cyclic Stiffness and Strength Degradation Curves of Sands through Discrete Element Modelling 用离散元模型推导砂土的循环刚度和强度退化曲线

WIT transactions on modelling and simulation Pub Date : 2022-09-30 DOI: 10.3390/modelling3040026

Fedor Maksimov, A. Tombari

{"title":"Derivation of Cyclic Stiffness and Strength Degradation Curves of Sands through Discrete Element Modelling","authors":"Fedor Maksimov, A. Tombari","doi":"10.3390/modelling3040026","DOIUrl":"https://doi.org/10.3390/modelling3040026","url":null,"abstract":"Cyclic degradation in fully saturated sands is a liquefaction phenomenon characterized by the progressive variation of the soil strength and stiffness that occurs when the soil is subjected to cyclic loading in undrained conditions. An evaluation of the relationships between the degradation of the soil properties and the number of loading cycles is essential for deriving advanced cyclic constitutive soil models. Generally, the calibration of cyclic damage models can be performed through controlled laboratory tests, such as cyclic triaxial testing. However, the undrained response of soils is dependent on several factors, such as the fabric, sample preparation, initial density, initial stress state, and stress path during loading; hence, a large number of tests would be required. On the other hand, the Discrete Element Method offers an interesting approach to simulating the complex behavior of an assembly of particles, which can be used to perform simulations of geotechnical laboratory testing. In this paper, numerical triaxial analyses of sands with different consistencies, loose and medium-dense states, were performed. First, static triaxial testing was performed to characterize the sand properties and validate the results with the literature data. Then, cyclic undrained triaxial testing was performed to investigate the impact of the number of cycles on the cyclic degradation of the soil stiffness and strength. Laws that can be used in damage soil models were derived.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77830008","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: 2

Modelling the Energy Consumption of Driving Styles Based on Clustering of GPS Information 基于GPS信息聚类的驾驶风格能耗建模

WIT transactions on modelling and simulation Pub Date : 2022-09-02 DOI: 10.3390/modelling3030025

M. Breuß, Ali Sharifi Boroujerdi, Ashkan Mansouri Yarahmadi

{"title":"Modelling the Energy Consumption of Driving Styles Based on Clustering of GPS Information","authors":"M. Breuß, Ali Sharifi Boroujerdi, Ashkan Mansouri Yarahmadi","doi":"10.3390/modelling3030025","DOIUrl":"https://doi.org/10.3390/modelling3030025","url":null,"abstract":"This paper presents a novel approach to distinguishing driving styles with respect to their energy efficiency. A distinct property of our method is that it relies exclusively on the global positioning system (GPS) logs of drivers. This setting is highly relevant in practice as these data can easily be acquired. Relying on positional data alone means that all features derived from them will be correlated, so we strive to find a single quantity that allows us to perform the driving style analysis. To this end we consider a robust variation of the so-called \"jerk\" of a movement. We give a detailed analysis that shows how the feature relates to a useful model of energy consumption when driving cars. We show that our feature of choice outperforms other more commonly used jerk-based formulations for automated processing. Furthermore, we discuss the handling of noisy, inconsistent, and incomplete data, as this is a notorious problem when dealing with real-world GPS logs. Our solving strategy relies on an agglomerative hierarchical clustering combined with an L-term heuristic to determine the relevant number of clusters. It can easily be implemented and delivers a quick performance, even on very large, real-world datasets. We analyse the clustering procedure, making use of established quality criteria. Experiments show that our approach is robust against noise and able to discern different driving styles.","PeriodicalId":89310,"journal":{"name":"WIT transactions on modelling and simulation","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82525414","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 Numerical Study on the Electrochemical Treatment of Chloride-Contaminated Reinforced Concrete 氯化物污染钢筋混凝土的电化学处理数值研究

WIT transactions on modelling and simulation Pub Date : 2022-08-22 DOI: 10.3390/modelling3030024

Yanan Xi, Yun Gao, Wenwei Li, D. Lei

引用次数: 0

Revisiting the Common Practice of Sellars and Tegart’s Hyperbolic Sine Constitutive Model 重新审视塞拉斯和特加特双曲正弦本构模型的共同实践

WIT transactions on modelling and simulation Pub Date : 2022-08-08 DOI: 10.3390/modelling3030023

S. Solhjoo

引用次数: 2

Characterizing Computational Thinking in the Context of Model-Planning Activities 模型规划活动中计算思维的特征

WIT transactions on modelling and simulation Pub Date : 2022-08-02 DOI: 10.3390/modelling3030022

Joseph A. Lyon, Alejandra J. Magana, R. Streveler

引用次数: 0