Computational Methods and Experimental Measurements XIX最新文献_第2页

DEVICES FOR ENVIRONMENTAL OBSERVATIONS 环境观测设备

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190061

G. Zappalà, Gabriella Caruso, V. Piermattei, A. Madonia, S. Bonamano, Alessandra Petri, M. Marcelli

{"title":"DEVICES FOR ENVIRONMENTAL OBSERVATIONS","authors":"G. Zappalà, Gabriella Caruso, V. Piermattei, A. Madonia, S. Bonamano, Alessandra Petri, M. Marcelli","doi":"10.2495/CMEM190061","DOIUrl":"https://doi.org/10.2495/CMEM190061","url":null,"abstract":"This paper describes some systems, designed and built by CNR in Messina and by Viterbo Tuscia University in its Civitavecchia laboratory, that fill the gap between traditional offshore oceanography and modern operational oceanography. The evolution of the main parts of such devices is analysed together with the pros and cons of design choices, not excluding the economic point of view that, together with instrument precision and reliability, is one of the main design constraints. Technological and scientific advancements were obtained in the state of the art, offering scientists new low cost instruments to perform research both in coastal and in harsh environment areas, exploiting the progress both in elaboration and in transmission electronic devices. The systems were designed to operate from fixed and mobile platforms, like Ships of Opportunity (SOOP) or towed vehicles. To this aim, CNR Messina set up a device able to automatically release up to eight expendable probes. Ruggedized versions of systems were built to be installed on small towed vehicles in harsh environments (Arctica). Sites at the sea-ice interface where blocks fall from glaciers due to ice melting, make it too difficult and dangerous to operate by traditional ships. During the June 2017 Svalbard campaign, a new generation water sampler, able to fill eight 500 ml bottles, was tested on field and showed a good operational performance. Various measuring instruments can be connected to the data acquisition and transmission system according to the research needs. They include multiparametric probes, expendable probes launched from SOOPs, water samplers for subsequent laboratory analysis, and any kind of device having a standard interface or providing a voltage-current signal. The land-based data assimilation can integrate the acquired in-situ data with satellite observation and the output of mathematical models.","PeriodicalId":368047,"journal":{"name":"Computational Methods and Experimental Measurements XIX","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126484175","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

OPTIMISATION OF MODELS FOR THE DETERMINATION OF THE CREST OF BARS ON SANDY BEACHES 沙质海滩沙洲波峰确定模型的优化

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190201

I. López, Y. Villacampa, J. Pagán, F. J. Navarro-González, L. Aragonés

引用次数: 0

COMPRESSIVE STRENGTH CLASSIFICATION OF LIGHTWEIGHT AGGREGATE CONCRETE USING A SUPPORT VECTOR MACHINE MODEL 基于支持向量机模型的轻骨料混凝土抗压强度分类

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190171

A. Tenza-Abril, Rosana Satorre-Cuerda, Patricia Compañ-Rosique, F. J. Navarro-González, Y. Villacampa

{"title":"COMPRESSIVE STRENGTH CLASSIFICATION OF LIGHTWEIGHT AGGREGATE CONCRETE USING A SUPPORT VECTOR MACHINE MODEL","authors":"A. Tenza-Abril, Rosana Satorre-Cuerda, Patricia Compañ-Rosique, F. J. Navarro-González, Y. Villacampa","doi":"10.2495/CMEM190171","DOIUrl":"https://doi.org/10.2495/CMEM190171","url":null,"abstract":"Lightweight aggregates (LWA) are used to produce low-density concretes required for building applications. Lightweight aggregate concrete (LWAC) is a multi-purpose material for construction, which offers technical, economical and environment benefits, and it is produced by replacing the normal-weight aggregates with LWA, depending upon the requirements of density and strength. LWAC is a complex composite material, and a model of its compressive strength must be highly nonlinear because it is very sensitive to its ingredients, so modelling its behaviour is a difficult task. Many studies have tried to develop accurate and effective predictive models for LWAC compressive strength. In this study, a support vector machine (SVM) learning algorithm is used to propose a model to classify the compressive strength of a wide range of LWAC. A dataset of 241 different LWACs were used for classifying the compressive strength into six different classes (from low-strength to high-strength) using different variables – quantity of cement, water and LWA in the dosage and density of the LWAC produced. The results show that increasing the variables means the model becomes more accurate up to approximately an 80% rate of success. The SVM model proved to be a significant tool to classify the compressive strength of LWAC contributing to engineers avoiding costly experimental trial tests.","PeriodicalId":368047,"journal":{"name":"Computational Methods and Experimental Measurements XIX","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125160449","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

DIGITAL EMULATION OF DIELECTRIC RELAXATION FUNCTIONS FOR CAPACITIVE SENSORS OF NON-DESTRUCTIVE DIELECTRIC SPECTROMETRY 非破坏性介电光谱电容式传感器介电弛豫函数的数字仿真

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190111

Aldis Kalpinsh, V. Shtrauss, U. Lomanovskis

引用次数: 2

MODIFIED SOIL TESTS FOR SCOUR ANALYSIS ON OFFSHORE WINDFARM FOUNDATIONS 海上风电场地基冲刷分析的改良土试验

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190181

Jorge Soriano-Vicedo, J. L. Frades, J. García-Barba, V. Negro-Valdecantos

{"title":"MODIFIED SOIL TESTS FOR SCOUR ANALYSIS ON OFFSHORE WINDFARM FOUNDATIONS","authors":"Jorge Soriano-Vicedo, J. L. Frades, J. García-Barba, V. Negro-Valdecantos","doi":"10.2495/CMEM190181","DOIUrl":"https://doi.org/10.2495/CMEM190181","url":null,"abstract":"The analysis of the scour processes following the pile driving procedures in offshore wind platforms is one of the major problems associated with this new form of clean energy generation. At present there are no scaled studies carried out analyzing the mechanical and deformational behavior of both the material of which the pile supporting the engine and the wind shovels is made (large steel hollow piles with a diameter of 8 m and a thickness of 15–20 cm) as well as the soil where the pile is driven. Usually these elements are installed on a very low granulometry sand displaced from the limits of dry beach– wet beach towards the offshore limits and where, due to this, it cannot return back to its natural state in its previous location. In addition, the few scaled studies carried out on dry soil similar to the existing one in the area of installation of the turbines has not considered a fundamental aspect such as the presence of seawater. This paper presents results obtained from tests to analyze the behavior of the base material on which the turbines are installed (degraded sands). These tests are the direct shear testing and a modification of the California bearing ratio (CBR) test to be carried out on completely submerged samples. The objective is to compare the results with those obtained in standard tests and analyze their suitability for field studies in offshore windfarms.","PeriodicalId":368047,"journal":{"name":"Computational Methods and Experimental Measurements XIX","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130687965","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

CROWD-FLOW SIMULATION USING THE POTENTIAL PATHLINE METHOD 潜在路径法的人群流模拟

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190031

S. Nam

引用次数: 1

BEHAVIOUR OF SMALL FATIGUE CRACKS IN CU-5.5NI-1.28SI ALLOY ROUND-BAR SPECIMENS cu-5.5ni-1.28si合金圆棒试样的小疲劳裂纹行为

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190011

M. Goto, Takaei Yamamoto, Seung-Zeon Han, J. Ahn, J. Kitamura, R. Takanami, T. Yakushiji, Je-hyun Lee

引用次数: 1

EFFECT OF CARBON NANOTUBE GRAFTING ONTO CARBON FIBRE ON THE CONDUCTIVITY OF CARBON FIBRE-REINFORCED THERMOPLASTIC LAMINATES 碳纳米管接枝碳纤维对碳纤维增强热塑性层压板导电性的影响

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190151

Kazuto Tanaka, Ken Uzumasa, T. Katayama

{"title":"EFFECT OF CARBON NANOTUBE GRAFTING ONTO CARBON FIBRE ON THE CONDUCTIVITY OF CARBON FIBRE-REINFORCED THERMOPLASTIC LAMINATES","authors":"Kazuto Tanaka, Ken Uzumasa, T. Katayama","doi":"10.2495/CMEM190151","DOIUrl":"https://doi.org/10.2495/CMEM190151","url":null,"abstract":"ABSTRACT Carbon fibre reinforced thermoplastics (CFRTP) can be expected to be used as a structural material for aircraft and automobiles, due to not only mechanical properties such as high specific strength and high specific rigidity, but also for their high recyclability and short moulding time. When lightning hits directly upon an airplane body made from CFRTP, the lightning current does not spread isotropically, which is different from a conductor, causing exterior damage and malfunction of the internal electronic equipment. In recent years, carbon nanotubes (CNTs) were expected to improve the mechanical properties and conductivity of composite materials, due to their excellent mechanical properties, conductivity and high aspect ratio. In this study, we evaluated the effect of CNT grafting onto carbon fibres, on the conductivity of CFRTP. CNT-grafted carbon fibres showed lower resistance values in the X and Y directions compared to carbon fibre alone. Although the resistance of CFRTP laminates using CNT-grafted carbon fibre in the X direction had the same value of CFRTP laminates using control as-received carbon fibre, we found that the resistance of CFRTP laminates using CNT-grafted carbon fibre in both the Y and Z directions had lower values.","PeriodicalId":368047,"journal":{"name":"Computational Methods and Experimental Measurements XIX","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127366107","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

UNCERTAINTY OF MEASUREMENT IN HPM PULSE TESTING HPM脉冲测试中测量的不确定度

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190071

R. Przesmycki, M. Bugaj, M. Wnuk

引用次数: 1

STUDY ON VESSEL MOTION CONTROL WITH TOWING ROPES AND DAMPERS FOR BERTHING 用拖曳绳和靠泊阻尼器控制船舶运动的研究

Computational Methods and Experimental Measurements XIX Pub Date : 2019-08-13 DOI: 10.2495/CMEM190101

Tae-Wan Kim, Dong-Hun Lee, J. Suh, Yongwoon Choi, Young-Bok Kim

引用次数: 0