Comptes Rendus Mecanique最新文献_第2页

Evaluation of an optimized bush fire propagation model with large-scale fire experiments 基于大尺度火灾实验的优化丛林火灾传播模型评价

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2021-03-04 DOI: 10.5802/CRMECA.77

David V. Brou, A. B. N’Dri, A. Brou, Aya Brigitte N’Drib, A. B. N’Dri

{"title":"Evaluation of an optimized bush fire propagation model with large-scale fire experiments","authors":"David V. Brou, A. B. N’Dri, A. Brou, Aya Brigitte N’Drib, A. B. N’Dri","doi":"10.5802/CRMECA.77","DOIUrl":"https://doi.org/10.5802/CRMECA.77","url":null,"abstract":"Thirty-one bush fire experiments are used to assess the predictive capability of a bush fire spread model. This model has been optimized by a deterministic method of parameter calibration. The experiments used were carried out each year from 2014 to 2017 in a forest–savannah transition zone. The characteristics of the herbaceous stratum as well as the meteorological and topographical data are well documented. The characteristics of the fire have also been measured to understand the behaviour of the fire in a Guinean savannah. The predicted rate of fire spread and fire contours gave results in good accordance with those of the experiments. Résumé. Trente et une (31) expériences de feu de brousse ont été utilisées pour évaluer la capacité prédictive d’un modèle de propagation de feux de brousse. Ce modèle a été optimisé par une méthode déterministe de calibrage des paramètres. Les expériences utilisées ont été réalisées chaque année de 2014 à 2017 dans une zone de transition forêt savane. Les caractéristiques de la strate herbacée ainsi que les données météorologiques et topographiques ont été bien documentées. Les caractéristiques du feu ont été également mesurées pour comprendre le comportement du feu dans une savane Guinéenne. Les vitesses de propagation et les contours de feux prédits ont donné des résultats en bon accord avec ceux des expériences.","PeriodicalId":50997,"journal":{"name":"Comptes Rendus Mecanique","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73619080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis on mechanical properties and evolution of mesostructure of soil–rock mixture samples from contact network perspective 接触网络视角下土石混合体试样力学特性及细观结构演化分析

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2021-03-04 DOI: 10.5802/CRMECA.73

Ran Xu, E. Liu, H. Xing

引用次数: 2

On the Eringen model for nematic liquid crystals 论向列液晶的Eringen模型

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2021-02-05 DOI: 10.5802/CRMECA.67

G. Chechkin, T. Ratiu, M. Romanov

引用次数: 1

About Tresca’s Memoirs on the fluidity of solids (1864–1870) 关于特雷斯卡关于固体流动性的回忆录(1864-1870)

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2021-02-05 DOI: 10.5802/CRMECA.69

J. Salençon

引用次数: 0

Exact results for weakly nonlinear composites and implications for homogenization methods 弱非线性复合材料的精确结果及其对均匀化方法的启示

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2021-01-13 DOI: 10.5802/CRMECA.66

J. Furer, M. I. Idiart, Pedro Ponte Castañeda

引用次数: 1

Deterministic optimization techniques to calibrate parameters in a wildland fire propagation model 林地火灾传播模型参数标定的确定性优化技术

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2020-12-14 DOI: 10.5802/crmeca.58

M. H. Tchiekre, A. Brou, J. Adou

{"title":"Deterministic optimization techniques to calibrate parameters in a wildland fire propagation model","authors":"M. H. Tchiekre, A. Brou, J. Adou","doi":"10.5802/crmeca.58","DOIUrl":"https://doi.org/10.5802/crmeca.58","url":null,"abstract":"To fight against forest fires, simple and improved models are more searched out due to the fact they are more easily understandable by the users. This actual model is part of the fire propagation models within a network. It is simple and easy to implement. However, it depends on several parameters that are difficult to measure or estimate precisely beforehand. The prediction by this model is therefore insufficient. A deterministic optimization method is introduced to calibrate its parameters. The optimized model was tested on several laboratory experiments and on two large-scale experimental fires. The comparison of the model results with those of the experiment shows a very significant improvement in its prediction with the optimal parameters. Résumé. Dans la lutte contre les feux de forêt, les modèles simples et améliorés sont plus recherchés car plus aisément compréhensibles par les utilisateurs. Le présent modèle fait partie des modèles de propagation de feu à l’intérieur d’un réseau. Il est simple et facile à mettre en œuvre. Cependant, il dépend de plusieurs paramètres difficiles à mesurer ou à estimer avec précision au préalable. La prédiction par ce modèle est de ce fait insuffisante. Par conséquent, une méthode déterministe d’optimisation est introduite pour calibrer ses paramètres. Le modèle optimisé a été testé sur plusieurs feux de laboratoires et sur deux feux expérimentaux à grande échelle. La comparaison des résultats du modèle avec ceux de l’expérience montre une amélioration très significative de sa prédiction avec les paramètres optimaux.","PeriodicalId":50997,"journal":{"name":"Comptes Rendus Mecanique","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85433362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Physico-chemical approach of polymer chemical ageing: a short review 高分子化学老化的物理化学方法综述

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2020-12-09 DOI: 10.5802/crmeca.64

E. Richaud

引用次数: 0

Polycrystal thermo-elasticity revisited: theory and applications 再论多晶热弹性:理论与应用

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2020-11-18 DOI: 10.5802/crmeca.18

C. Tomé, R. Lebensohn

{"title":"Polycrystal thermo-elasticity revisited: theory and applications","authors":"C. Tomé, R. Lebensohn","doi":"10.5802/crmeca.18","DOIUrl":"https://doi.org/10.5802/crmeca.18","url":null,"abstract":"The self-consistent (SC) theory is the most commonly used mean-field homogenization method to estimate the mechanical response behavior of polycrystals based on the knowledge of the properties and orientation distribution of constituent single-crystal grains. The original elastic SC method can be extended to thermo-elasticity by adding a stress-free strain to an elastic constitutive relation that expresses stress as a linear function of strain. With the addition of this independent term, the problem remains linear. Although the thermo-elastic self-consistent (TESC) model has important theoretical implications for the development of self-consistent homogenization of non-linear polycrystals, in this paper, we focus on TESC applications to actual thermo-elastic problems involving non-cubic (i.e. thermally anisotropic) materials. To achieve this aim, we provide a thorough description of the TESC theory, which is followed by illustrative examples involving cooling of polycrystalline non-cubic metals. The TESC model allows studying the effect of crystallographic texture and single-crystal elastic and thermal anisotropy on the effective thermo-elastic response of the aggregate and on the internal stresses that develop at the local level.","PeriodicalId":50997,"journal":{"name":"Comptes Rendus Mecanique","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84718259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Morphogenetic processes: from leaves to embryos 形态发生过程:从叶片到胚胎

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2020-11-16 DOI: 10.5802/crmeca.33

L. Pauchard

引用次数: 0

Morphogenesis through elastic phase separation in a pneumatic surface 气动表面通过弹性相分离形成形态

IF 0.8 4区工程技术

Comptes Rendus Mecanique Pub Date : 2020-11-16 DOI: 10.5802/crmeca.43

Emmanuel Si'efert, B. Roman

引用次数: 2