Tesis: "Calibration Case Study"

1

Ar, Kerem. "Calibration Of Water Distribution Networks". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12613934/index.pdf.

Texto completo

Resumen

Water distribution network models are used for different purposes. In this study, a model, used for daily operational issues is concerned. Models results should be consistent with actual conditions for sound decisions during operational studies. Adjusting model parameters according to site measurements in order to fit the model to obtain realistic results is known as calibration. Researchers have carried out numerous studies on calibration and developed various methods. In this study, an actual network (N8.3 Pressure Zone, Ankara) has been calibrated by two classical methods developed by Walski (1983) and Bhave (1988). The network parameter calibrated in this study is Hazen-Williams roughness coefficient, C-factor, and other parameters have been lumped in the C-factor. Results of the analysis showed that, C-factors have been found in a wide range.

Los estilos APA, Harvard, Vancouver, ISO, etc.

2

Apaydin, Oncu. "Automated Calibration Of Water Distribution Networks". Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615692/index.pdf.

Texto completo

Resumen

Water distribution network models are widely used for various purposes such as long-range planning, design, operation and water quality management. Before these models are used for a specific study, they should be calibrated by adjusting model parameters such as pipe roughness values and nodal demands so that models can yield compatible results with site observations (basically, pressure readings). Many methods have been developed to calibrate water distribution networks. In this study, Darwin Calibrator, a computer software that uses genetic algorithm, is used to calibrate N8.3 pressure zone model of Ankara water distribution network
in this case study the network is calibrated on the basis of roughness parameter, Hazen Williams coefficient for the sake of simplicity. It is understood that there are various parameters that contribute to the uncertainties in water distribution network modelling and the calibration process. Besides, computer software&rsquo
s are valuable tools to solve water distribution network problems and to calibrate network models in an accurate and fast way using automated calibration technique. Furthermore, there are many important aspects that should be considered during automated calibration such as pipe roughness grouping. In this study, influence of flow velocity on pipe roughness grouping is examined. Roughness coefficients of pipes have been estimated in the range of 70-140.

Los estilos APA, Harvard, Vancouver, ISO, etc.

3

Poon, Phillip y Matthew Dunlop. "Calibration of High Dimensional Compressive Sensing Systems: A Case Study in Compressive Hyperspectral Imaging". International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579668.

Texto completo

Resumen

ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV
Compressive Sensing (CS) is a set of techniques that can faithfully acquire a signal from sub- Nyquist measurements, provided the class of signals have certain broadly-applicable properties. Reconstruction (or exploitation) of the signal from these sub-Nyquist measurements requires a forward model - knowledge of how the system maps signals to measurements. In high-dimensional CS systems, determination of this forward model via direct measurement of the system response to the complete set of impulse functions is impractical. In this paper, we will discuss the development of a parameterized forward model for the Adaptive, Feature-Specific Spectral Imaging Classifier (AFSSI-C), an experimental compressive spectral image classifier. This parameterized forward model drastically reduces the number of calibration measurements.

Los estilos APA, Harvard, Vancouver, ISO, etc.

4

Kazemzadeh, Samimi Anahita. "Estimation of regional groundwater level through calibration of GRACE satellite data : A case study in southern half of Sweden". Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-13634.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

5

Andersson, Sara. "Mapping Uncertainties – A case study on a hydraulic model of the river Voxnan". Thesis, KTH, Mark- och vattenteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173848.

Texto completo

Resumen

This master thesis gives an account for the numerous uncertainties that prevail one-dimensional hydraulic models and flood inundation maps, as well as suitable assessment methods for different types of uncertainties. A conducted uncertainty assessment on the river Voxnan in Sweden has been performed. The case study included the calibra-tion uncertainty in the spatially varying roughness coefficient and the boundary condi-tion uncertainty in the magnitude of a 100-year flood, in present and future climate conditions. By combining a scenario analysis, GLUE calibration method and Monte Carlo analysis, the included uncertainties with different natures could be assessed. Significant uncer-tainties regarding the magnitude of a 100-year flood from frequency analysis was found. The largest contribution to the overall uncertainty was given by the variance between the nine global climate models, emphasizing the importance of including projections from an ensemble of models in climate change studies. Furthermore, the study gives a methodological example on how to present uncertainty estimates visually in probabilistic flood inundation maps. The conducted method of how the climate change uncertainties, scenarios and models, were handled in frequency analysis is also suggested to be a relevant result of the study.

Los estilos APA, Harvard, Vancouver, ISO, etc.

6

Chatzakis, Alexandros. "Calibration of a 2D hydrodynamic model for flood inundation extent using aerial photographs : A case study of the Hallsberg flood event in 5-9 September 2015". Thesis, KTH, Vattendragsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204901.

Texto completo

Resumen

Alteration of rainfall patterns is one major impact of climate change. Rainfall events with big precipitation volumes under short periods of time are predicted to become even more frequent in higher latitude regions, including Sweden. One characteristic example of such an intense rainfall occurred between the 5th and 6th of September 2015 in Hallsberg, a city in central Sweden, where approximately 105 mm of rain fell under 24 hours, causing severe flooding in the city. In order to be able to predict flood cases like the aforementioned one, hydrodynamic models are employed to simulate floods and investigate rainfall scenarios so that the competent authorities can take precaution measures. However, due to lack of calibration data most of flood models are not validated and are comprised of substantial uncertainty. This report aims to study the Hallsberg flood event in September 2015 by calibrating a hydrodynamic model using aerial photographs for the flood inundation extent. The utilized model is MIKE 21, which is a 2D overland flow model developed by DHI. Contrary to the common practice in flood studies where inclusion of the infiltration capacity is implemented with an arbitrary reduction of the rain volume, the infiltration module of MIKE 21, which is a new development in the model, was utilized. Apart from the inundation extent, the outputs were also evaluated for the water depth in two points based on a photograph captured from the streets of the affected area, the description of the course of events for the timing of flood’s culmination and the water volume on the pixels that were erroneously simulated as flooded. The results presented a high degree of agreement with the observations. The parameter of surface resistance, expressed as Manning’s “M”, was found to be of paramount importance with the suitable values for undeveloped areas being below 5. In addition, the culverts’ limited capacity played an important role in the flooding of the city and hence including them in the simulations is crucial. Finally, utilization of the infiltration module resulted in a higher accuracy of 8.3% although it can be considered more of an arbitrary deduction of water as some of the parameters used in it are not physically well justified.
Ändringar i nederbördsmönster är en tydlig konsekvens av klimatförändringen. Regnhändelser med stora volymer nederbörd under korta tidsperioder förutses bli alltmer frekventa i regioner vid högre breddgrader, däribland Sverige. Ett karaktäristiskt exempel av en sådan händelse skedde mellan den femte och sjätte september 2015 i Hallsberg. Ca 105 mm regn föll inom loppet av 24 timmar vilket orsakade stora översvämningar i staden. För att kunna förutse översvämningar så som den tidigare nämnd och möjliggöra vidtagning av förebyggande åtgärder används hydrodynamiska modeller för att simulera vattenflöden och undersöka möjliga scenarion av nederbörd. Emellertid, på grund av avsaknaden av data för kalibrering av modellerna medför användandet av dem en signifikant osäkerhet. Syftet med den här rapporten är att undersöka översvämningen i Hallsberg i september 2015 genom att kalibrera en hydrodynamisk modell med hjälp av flygbilder för översvämningens utbredning. Den använda modellen, MIKE 21, är en 2D modell över ytavrinningen utvecklad av DHI. Praxis vid studiet av översvämningar är att inkludera infiltrationsförmåga med ett godtyckligt avdrag av nederbörden. Här används istället infiltreringsmodulen för MIKE 21, vilket är en ny del som har utvecklats i modellen. Förutom översvämningens utbredning utvärderades även resultaten utifrån vattendjupet vid två punkter baseras på ett fotografi från gatorna i det drabbade området. Utvärdering av resultaten gjordes också mot tid av översvämnings kulm från beskrivning av händelses förlopp samt vattenvolym vid pixlarna som felaktigt simulerades som översvämmade. Resultatet visade på en hög grad av samstämmighet med gjorda observationer. Parametern ytans råhet, uttryckt som Mannings ”M”, visade sig vara av stor betydelse med lämpliga värden för underutvecklade områden under 5. Därtill spelade kulvertarnas begränsade kapacitet en viktig roll vid översvämmandet av staden. Att inkludera dessa i simuleringarna var därför avgörande. Slutligen, användandet av infiltreringsmodulen resulterade i en högre noggrannhet av 8.3 %, även om det kan anses vara ett godtyckligt vattenavdrag då vissa av de använda parametrarna inte är fysiskt välmotiverade.

Los estilos APA, Harvard, Vancouver, ISO, etc.

7

Le, Maître Johann. "Développement de la spectrométrie de masse à ultra- haute résolution associée à la spectrométrie de mobilité ionique pour la caractérisation de coupes pétrolières lourdes. structural analysis of heavy oil fractions afterr hydrodenitrogenation by high-resolution tandem mass spectrometry and ion mobility spectrometry Structural analysis of neutral nitrogen compounds refractory to the hydrodenitrogenation process of heavy oil fractions by high-resolution tandem mass spectrometry and ion mobility-mass spectrometry Chemical characterization of 15 biocrudes obtained from hydrothermal liquefaction of industrially cultivated wild micro algae Chemical characterization with different analytical techniques, a way to understand the process: Case of the paraffinic base oil production line Exploring complex mixtures by cyclic ion mobility high-resolution mass spectrometry – Application towards Petroleum. Simulation and modeling of Collision Cross Section for structural elucidation of heavy oil fraction by ion mobility-mass spectrometry: Using polyaromatic hydrocarbons compounds mixture as calibration standard Characterization of sulfoxides compounds in dimeric distribution of heavy oil fractions by positive-ion electrospray ionization FTICR mass spectrometry Structural analysis of Petroporphyrins from asphaltene by trapped ion mobility coupled with a Fourier transform ion cyclotron resonance mass spectrometer. Cyclic ion mobility spectrometry coupled to high-resolution time-of-flight mass spectrometry equipped with atmospheric solid analysis probe for the molecular characterization of combustion particulate matter. Structural study of analogues of Titan’s haze by trapped ion mobility coupled with a Fourier transform ion cyclotron mass spectrometer". Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR051.

Texto completo

Resumen

L'évolution des réserves de pétrole implique l'utilisation en raffinerie de pétroles bruts non conventionnels, bien souvent plus lourds et donc difficiles à caractériser. Les produits pétroliers sont en effet des mélanges chimiques extrêmement complexes. La partie légère et volatile peut être analysée par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC/MS), permettant l'identification des composés par l'utilisation de mesures de masses précises et de modèles de fragmentation. Cependant ces techniques sont inadaptées à l'analyse des fractions lourdes. Dans la pratique, la caractérisation des mélanges les plus complexes implique l'utilisation de spectromètres de masse à ultra-haute résolution généralement par analyse directe sans séparation chromatographique. La technique de référence est aujourd’hui la spectrométrie de masse à transformée de Fourier par résonance cyclotronique des ions (FTICR). Grâce à une résolution supérieure à 106 et à une précision de mesure de masse inférieure à 0,1 ppm, cet instrument permet de séparer toutes les espèces présentes dans un produit pétrolier et d'attribuer à chaque valeur de m/z une composition élémentaire unique. Ceci permet d'obtenir très facilement des cartes moléculaires qui peuvent être présentées graphiquement en utilisant le diagramme de Kendrick, le diagramme de van Krevelen ou le nombre d'insaturations (DBE) en fonction du nombre de carbones. Ce travail de thèse a permis grâce à la caractérisation moléculaire de produits pétroliers (Vacuum Gas Oil, Pétroles Bruts, Matériel Interfacial, Asphaltènes et Bio-Oil…) d'aborder la complexité de leur traitement dans l’outil de raffinage. Des protocoles d'analyses des échantillons ont été développés, à l'aide de différentes sources d'ionisation à pression atmosphérique (ESI, APCI et APPI) ainsi que par désorption/ionisation laser (LDI) sur le spectromètre de masse FTICR 12T. Les informations sur le contenu isomérique des produits pétroliers ont ensuite été déterminées grâce à l'apport de la spectrométrie de mobilité ionique (IMS)
The evolution of oil reserves requires the use in refineries of unconventional crude oils, which are often heavier and therefore difficult to characterize. Petroleum products are in fact extremely complex chemical mixtures. The light and volatile part can be analysed by gas chromatography coupled with mass spectrometry (GC/MS), allowing the identification of compounds by using precise mass measurements and fragmentation models. However, these techniques are inappropriate for the analysis of heavy fractions. In practice, the characterization of the most complex mixtures involves the use of ultra-high-resolution mass spectrometers generally by direct analysis without chromatographic separation. The reference technique today is Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR). With a resolution of more than 106 and a mass measurement accuracy of less than 0.1 ppm, this instrument can separate all the species present in a petroleum product and assign a unique elemental composition to each m/z value. This makes it very easy to obtain molecular maps that can be presented graphically using the Kendrick diagram, the van Krevelen diagram or the number of unsaturations (DBE) as a function of the number of carbons. This thesis work has allowed thanks to the molecular characterization of petroleum products (Vacuum Gas Oil, Crude Oil, Interfacial Material, Asphaltenes and Bio-Oil...) addressing the complexity of their treatment in the refining tool. Protocols for sample analysis have been developed, using different sources of ionization at atmospheric pressure (ESI, APCI and APPI) as well as laser desorption/ionization (LDI) on the FTICR 12T mass spectrometer. Information on the isomeric content of petroleum products was then determined using ion mobility spectrometry (IMS)

Los estilos APA, Harvard, Vancouver, ISO, etc.

8

Chung, Hsiu Hsuan y 鍾秀瑄. "Calibration laboratory selection study--A case study of semiconductor assembly". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/m5r773.

Texto completo

Resumen

碩士
國立清華大學
工業工程與工程管理學系碩士在職專班
104
The purpose of this study is to identify the key third-party calibration laboratory selection criteria for the semiconductor assembly and test company in Taiwan. Literature on calibration laboratory selection, that considers several matters such as professionalism, calibration fee, uncertainty, are relatively limited. However, both international standards and company’s customers have required that all gauges, measuring instrument should provide calibration activity record to provide evidence of conformity to product requirement. The value of this research provides a systematic laboratory selection model. Initially, identifying the critical criteria and classifying the quality attribute by the fuzzy Delphi method and Fuzzy Kano model separately. In the second phase, calculate the important weight of criteria by the AHP. Finally, ranking qualified calibration laboratory by the VIKOR. Creating a procurement contract with a filtered and qualified calibration laboratory to reduce the annual calibration cost. In addition, it not only can complete periodic calibration to avoid auditing finding but also ensure the accuracy of instrument to avoid unnecessary customer complaint. The proposed approach has also been examined by a case study. The research result shows that must-be attribute is the most important criterion group. At the detailed sub-criteria level, instrument capability, specialize knowledge, calibration fee, send and receive service and laboratory management are the top five criteria. Therefore, the decision-makers have shown much concern for accuracy and resolution of standard unit, standard unit maintenance and calibration record, lab staff’s technical and quality management skills, reasonable calibration fee and send/receive service.

Los estilos APA, Harvard, Vancouver, ISO, etc.

9

Li, Jiun-han y 李郡漢. "A Case Study for the Development Strategy in Instrument Calibration Industry". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/u7tr23.

Texto completo

Resumen

碩士
國立臺灣科技大學
工業管理系
94
Any Industry during the process of researching and developing the products，or making，designing products，or at the stage of testing，will not guarantee the quality of the products unless it relies on the monitoring and the quantity of the precision instrument to examine it’s products。And technology of the instrument corrected especially guarantees the accuracy of the instrument。It has also been proved that the industry that corrects instrument has close relations with the development of the hi-tech industry。In order to have a clear understanding of prospect of the Industry that corrects instrument this research is to do deep discussion about it with the title of future development tactics of the industry that corrects instrument。 This research is to point out the change and the threat which the whole industry environment brought toward the industry that corrects instrument，to analyze the chance and threat by means the case company inside and outside。Because there are so many competitors of correcting industry of the instrument and they face the great changeable environment，these competitors must face the question of making the transition by themselves。The solution is that through developing new verification，calibration technology and establishing the researching-developing group，the competitors can make the transition and make measuring platforms to set up technology，and to become diversified measuring–correcting laboratories and to become the groups which design and produce key spare parts。This development tactics have already become the key point with which the unit of correcting industry of the instrument can get the current situation made transition and succeed。In order to solve the current problem of he case enterprise，this research sets about from the company’s mission and management tactics in order to understand and analyze the future thrust of the case company，and to probe into the development tactics in the future，to enable case enterprises to have one criterion to use on solving problems 。Finally，this research also proposes the suggestion on other same trades，and makes them get a clear reference directions。

Los estilos APA, Harvard, Vancouver, ISO, etc.

10

Tsai, Yu-Min y 蔡育旻. "Service expectation and cognition: A case study of SGS calibration laboratory". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/98365482916299503636.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

11

Cheng, Chung-Ching y 程中慶. "Uncertainty Evaluation of Measurement Systems - A Case Study of Resistance Calibration System". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/vt3466.

Texto completo

Resumen

碩士
中原大學
工業與系統工程研究所
102
The study is based on ISO (International Organization for Standardization, ISO) as amended by the ‘degree of measurement uncertainty representation guidelines’ (Guide to the Expression of Uncertainty in Measurement, GUM) as the basis, and added NASA's ‘Measurement Uncertainty Analysis Principles and Methods’ to do assessment analysis on DC resistance with retroactive periodic calibration of Multi-Function Calibrator (FLUKE 5700A) and Selfcal Digital Multimeters (WAVETEK 1281) by National Measurement Laboratory R.O.C (NML) . According to the DC resistance repetitive calibration standard operating procedures to conduct a variety of computing degree of uncertainty assessment. Assessment to determine the degree of the eight steps in accordance with ISO GUM of measurement uncertainty and added Cause &; Effect Diagram to ensure that the relevant factors of uncertainty from omission. Using statistical analysis of data summarized, so that Class A degree of uncertainty to a minimum standard, to achieve effective execution measurement capabilities. Join NASA's "Measurement Uncertainty Analysis Principles and Methods" do assessment analysis, hoping to determine the degree of measurement uncertainty compared with the ISO GUM, the results show that Pre-GUM uncertainty is less than the ISO GUM uncertainty. This study provides ISO GUM system measurement uncertainty assessment methods beyond, and to provide Pre-GUM system measurement uncertainty assessment methods in order to provide an alternative to the industry as a reference and research.

Los estilos APA, Harvard, Vancouver, ISO, etc.

12

Kamali, Mahtab. "Calibration of Hydrologic Models Using Distributed Surrogate Model Optimization Techniques: A WATCLASS Case Study". Thesis, 2009. http://hdl.handle.net/10012/4287.

Texto completo

Resumen

This thesis presents a new approach to calibration of hydrologic models using distributed computing framework. Distributed hydrologic models are known to be very computationally intensive and difficult to calibrate. To cope with the high computational cost of the process a Surrogate Model Optimization (SMO) technique that is built for distributed computing facilities is proposed. The proposed method along with two analogous SMO methods are employed to calibrate WATCLASS hydrologic model. This model has been developed in University of Waterloo and is now a part of Environment Canada MESH (Environment Canada community environmental modeling system called Modèlisation Environmentale Communautaire (MEC) for Surface Hydrology (SH)) systems. SMO has the advantage of being less sensitive to "curse of dimensionality" and very efficient for large scale and computationally expensive models. In this technique, a mathematical model is constructed based on a small set of simulated data from the original expensive model. SMO technique follows an iterative strategy which in each iteration the surrogate model map the region of optimum more precisely. A new comprehensive method based on a smooth regression model is proposed for calibration of WATCLASS. This method has at least two advantages over the previously proposed methods: a)it does not require a large number of training data, b) it does not have many model parameters and therefore its construction and validation process is not demanding. To evaluate the performance of the proposed SMO method, it has been applied to five well-known test functions and the results are compared to two other analogous SMO methods. Since the performance of all SMOs are promising, two instances of WATCLASS modeling Smoky River watershed are calibrated using these three adopted SMOs and the resultant Nash-Sutcliffe numbers are reported.

Los estilos APA, Harvard, Vancouver, ISO, etc.

13

Kuo, Jung Hua y 郭榮華. "The Competitive Strategy on Equipment Calibration Market in Taiwan – A Case Study of A Company". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/44460133247872212810.

Texto completo

Resumen

碩士
輔仁大學
科技管理學程碩士在職專班
98
Technology evolution is the key factor to drive the industry moving forward. Equipments with high precision can assist in getting standardized data, so as for corporations to transform them into “products”. As the precision level of equipment is so crucial to the product quality at the end, periodical calibration on equipments becomes a must so as to ensure the precision & consistence of what measured during manufacturing. There are various kinds of equipments used in different industries, thus the needed calibration services also vary from one to the other. However, they are all confined in 2 basic principles, “measurement tracking system” & “best measurement capability of Lab.” For example, the calibration need in aviation industry got to be able to be traced to NIST (National Institute of Standards & Technology, the institute in charge of standardization in U.S.), and the communication & mechanical industries also demand the very high calibration capability from Lab… All these drive the business of calibration services grow fast, and, it also triggers the investments in buying the standardization system of calibration among all calibration service providers so as to remain competitive enough in the market. In addition to the heavy investment in buying calibration equipments, the capability from technicians to execute different kinds of creative service activities also becomes an important subject to the growth of lab service business. Because it requires the professionals to design the standard operation procedure (SOP) & the measurement uncertainty assessment documents, so as to comply to the TAF technical requirements while applying the TAF certifications for new calibration subjects. As a result, the key for Labs to succeed in a fair-competition calibration market is to look for the best balance point among quality, price, cost, credibility, and service. The goal is to provide users/clients world unified & precise calibration services with affordable fair pricing, to ensure best possible quality of products yielded at the end.

Los estilos APA, Harvard, Vancouver, ISO, etc.

14

Lan, Chi-Kuang y 藍啟光. "Estimating the Uncertainty of Measurements in the Electrical Calibration Laboratory ---Case Study Based on Company A". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/f86d9m.

Texto completo

Resumen

碩士
中原大學
工業與系統工程研究所
98
The purpose of the research is to estimate the uncertainty of measurements in the electrical calibration laboratory of company A in accordance with the ISO Guide to the Expression of Uncertainty in Measurement (ISO GUM). We have many practical difficulties facing us despite the concrete procedures provided by ISO GUM. This research study is intended to illustrate and solve the difficulties in the practice. Abiding by the procedures in ISO GUM, we analyze the uncertainty of measurements and study the error sources in the measurement by ANOVA. Seeing that multiple measurement points are adopted in the practice, we calculate the uncertainty of measurements by regression analysis. Subsequently, we monitor the measurement system via control charts and study the influence of degrees of freedom on Type B evaluation of uncertainty . Illustrating the course of evaluating the uncertainty of measurements, we have some suggestions and conclusions in this thesis study: (1) The error sources influence the uncertainty of measurements in the calibration laboratory of company A mainly include regression curve effects, specifications of instruments and standard traceability, which are fundamental issues to be improved. (2) Improper use of measurement equations will result in wrong evaluation of the uncertainty of measurements. Besides discussing the measurement system characteristics, we collect articles and standards in order to establish applicable mathematical models. (3) In the research study, by changing values of R in Type B evaluation of uncertainty, we found that when Type B uncertainty becomes a main component of combined standard uncertainty, degrees of freedom for Type B evaluations will have a great effect on the result of evaluating expanded uncertainty.

Los estilos APA, Harvard, Vancouver, ISO, etc.

15

Corredor, Edward Alexis Baron. "Assessment and identification of concrete box-girder bridges properties using surrogate model calibration: case study: El Tablazo bridge". Master's thesis, 2017. http://hdl.handle.net/1822/70634.

Texto completo

Resumen

Dissertação de mestrado integrado em Engenharia Civil
This work consists in identifying and assessing the properties in a pre-stressed concrete bridge related to material, geometry and physic sources, through a surrogate model. The participation of this mathematical model allows to generate a relationship between bridge properties and its dynamic response, with the purpose of creating a tool to predict the analytical values of the studied properties from measured eigenfrequencies; in this case, it is introduced the identification of damage scenarios, giving the application for validate the generated metamodel (Artificial Neural Network - ANN). A FE model is developed to simulate the studied structure, a Colombian bridge called El Tablazo, one of the higher in the country of this type (box-girder bridge), with a total length of 560 meters, located on the Sogamoso riverbed in the region of Santander - Colombia. Once the damage scenarios are defined, this work allows to indicate the basis for futures plans of structural health monitoring.
Este trabalho consiste em identificar e avaliar as propriedades de uma ponte em betão pré-esforçado em relação ao material, geometria e características físicas através de um metamodelo. A participação deste modelo matemático permite gerar uma relação entre as propriedades da ponte e sua resposta dinâmica, com o objetivo de criar uma ferramenta para prever os valores analíticos das propriedades estudadas a partir de frequências próprias medidas; neste caso, é introduzida a identificação de cenários de dano, dando uma aplicação para validar o metamodelo (Rede Neural Artificial - ANN). Um modelo de elemento finito é desenvolvido para simular a estrutura estudada, uma ponte colombiana chamada El Tablazo, uma das que apresenta maior altura do país em seu tipo (pontes em viga-caixão), com um comprimento total de 560 metros, localizada no rio Sogamoso, na região de Santander - Colômbia. Uma vez que os cenários de dano são definidos, a tese permite indicar a base para os planos futuros de monitoramento da saúde estrutural.

Los estilos APA, Harvard, Vancouver, ISO, etc.

16

Shiu, Fu-Jian y 許富建. "Development and Application of Regional Groundwater Numerical Model Calibration Methodology, A Case Study of Chou-Shui River Alluvial Fan". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/af93h4.

Texto completo

Resumen

碩士
國立臺灣大學
土木工程學研究所
104
This study is aimed to develop a regional groundwater numerical model calibration method, which applies empirical orthogonal function (EOF) with simulated error hydrograph of groundwater level to quickly and accurately catch and calibrate the temporal-spatial distribuation of surface water recharge and hydrogeological parameters. The established method was applied on the groundwater system of Chou-Shui River Alluvial Fan. The proposed groundwater parameters calibration method is based on an optimization model which the objective function is minimizing the the root mean square error (RMSE) of the simulated and observed average error in groundwater storage. The decision variables are horizontal hydraulic conductivity, vertical leakance and surface water recharge. There are three constraints of the optimization model: (1) the surface water recharge of groundwater system in every iteration of calibrating process must obey the mass balance; (2) the simulated groundwater level must follow the governing equation of groundwater flow; (3) the value of horizontal hydraulic conductivity and vertical leakance are restricted to a reasonable limits. The process of the optimization model sets the initial value of decision variables first, and inputs the variables to groundwater model. Thus, the groundwater level can be simulated and the objective function will be estimated. If the objective function doesn’t satisfy the stop condition, the simulated error hydrograph of groundwater level will be calculated and analyzed with EOF. Then, the modified decision variables is calculater according to the simulated error hydrograph of groundwater level end the result of EOF analysis. From iterations, the optimal temporal-spatial distribuation of surface water recharge and hydrogeological parameters can be obtain. This study applied the optimization model on the calibration of the groundwater system in Chou-Shui River Alluvial Fan. The simulated period is from January 2012 to December 2014 monthly. The total variables of hydraulic conductivity in four acquifers are 126, of vertical leakance are 96. There are 1302 the surface water recharge temporal-spatial distribuation in all stress period. The result show that the RMSE is decreased dramatically in early iteration of the calibration and become smoothly after 5th iteration and finally stop at 24th iteration. The calibrated hydraulic conductivity and vertical leakence are mostly in reasonable limits. The simulated groundwater level can reflect the approximately trendance in all acquifer and can capture the peak of the observed value in first acquifer. Hence, the established method of this study can effectively and accurately calibrate temporal-spatial distribution of surface water recharge and hydrogeological parameters.

Los estilos APA, Harvard, Vancouver, ISO, etc.

17

Lo, Chen-Yu y 羅振優. "Establishment and Application of Numerical Model Calibration Method for Groundwater Flow Near Infiltration Gallery – A Case Study of Lin-Bien River". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/kav7tx.

Texto completo

Resumen

碩士
國立臺灣大學
土木工程學研究所
103
This thesis aims to establish a numerical model calibration method for groundwater flow near infiltration gallery, and apply this method to an in-situ case of infiltration gallery in Lin-Bien River; in order to highlight the usage of the method had built. The numerical model calibrating method established by this thesis includes calculating groundwater balance near infiltration gallery, building numerical model and formulating optimization model for parameter verification. First, by calculating system groundwater balance, we will realize the ground surface boundary recharge, upstream inflow quantity, downstream outflow quantity and water intake of infiltration gallery. The method computes the quantity of recharge through every system boundary, the rate of change of system water storage and calculates river and rainfall recharge by continuity equation. Second, build a numerical model and its optimization model for parameter verification; solve the best combination of soil parameter, depth/infiltration recharge of river and rainfall infiltration proportion. Above-mentioned optimization model for parameter verification will solve by iterative method with a more efficient trial and error method, until objective function is minimum. On the other hand, delete the mesh to simulate the space in the infiltration gallery, and conceptualize it into a form of open channel, the right, left hand and bottom side are concrete material, and top side is decide as different filter layer. Given head condition are set up in the concrete region to simulate the gravity controlled condition, after the simulation is finished, summation the flux on each node to get the infiltration gallery discharge. This thesis was applied to the process to groundwater system near infiltration gallery of Lin-Bien River. According to calculating system groundwater balance result, during 2010/01/01~2010/09/05, the total recharge is 41.9 million tons, river and rainfall infiltration recharge are 98.9% among them, upstream boundary recharge are 1.1% among them. Total out flow is 41.3 million tons, downstream outflow are 35.6% among them, water intake of infiltration gallery are 64.4% among them. According to the result of calibrating groundwater flow model near infiltration gallery of Lin-Bien River, during dry and rainy season in 2010/01/01~2010/09/05, RMSE of observing well C are 0.17 m and 0.08m respectively, CE are 0.98 and 0.998 respectively, CC are 0.99 and 0.999 respectively. RMSE of observing well D are 0.27 m and 0.14m respectively, CE are 0.89 and 0.98 respectively, CC are 0.98 and 0.99 respectively. RMSE of observing well E are 0.112 m and 0.114m respectively, CE are 0.98 and 0.99 respectively, CC are 0.98 and 0.996 respectively. RMSE of observing water intake of infiltration gallery are 5,465(cmd) and 2,958(cmd) respectively, CE are 0.94 and 0.99 respectively, CC are 0.97 and 0.995 respectively. The total recharge is 4.28 million tons, river and rainfall infiltration recharge are 99.2% among them, upstream boundary recharge are 0.8% among them. Total out flow is 42.9 million tons, downstream outflow are 41% among them, water intake of infiltration gallery are 59% among them.

Los estilos APA, Harvard, Vancouver, ISO, etc.

18

YANG, CHENG-YING y 楊政穎. "Development and Application of Groundwater Numerical Model Calibration Methology, a Case Study of Chou-Shui River Alluvial Fan and Minzu Basin". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hj35d2.

Texto completo

Resumen

碩士
國立臺灣大學
土木工程學研究所
106
This study is aimed to develop a regional groundwater numerical model calibration method. After finsishing the model, I will apply it to evaluate the change of groundwater level when decreasing the volume of pumping in severe subsidence area, and possible volume of pumping in area. When I want to correct the parameters, I use Gradient method. It uses partial derivatives on objective function to decide the correction of parameters. However, the outcome of partial derivatives on objective function can’t be solved. So, I use physical principal and some mathematical function to approximate the the part of partial derivatives, and this can quickly find the correction of 5 parameters including net surface recharge, pumping in deep aquifer , net boundary flux , horizontal hydraulic conductivity, and vertical leakance. Finally, the established method was applied on the groundwater system of Chou-Shui River Alluvial Fan and Minzu Basin. With this model, we can estimate the pumping potential of Minzu Basin and the rise of groundwater in severe subsidence area of Chou-Shui River Alluvial Fan when decreasing the volume of pumping. The proposed groundwater parameters calibration method is based on an optimization model which the objective function is minimizing the the sum of square error of the simulated and observed error in groundwater storage. The decision variables are net surface recharge, volume of pumping in deep aquifer , net boundary flux ,horizontal hydraulic conductivity, and vertical leakance. There are three constraints of the optimization model: (1) the flow of groundeater system msut flow the conservation of mass(2) the simulated groundwater level must follow the governing equation of groundwater flow; (3) all decision variables are restricted to a reasonable limits. The process of the optimization model sets the initial value of decision variables first, and inputs the variables to groundwater model. Thus, the groundwater level can be simulated and the objective function will be estimated. If the objective function doesn’t satisfy the stop condition, the simulated error hydrograph of groundwater level will be calculated. Applying the physical principal and some math function, the modified decision variables is calculater according to the simulated error hydrograph of groundwater level. From iterations, the optimal temporal-spatial distribuation of decision variables can be obtained. This study applied the optimization model on the calibration of the groundwater system in Chou-Shui River Alluvial Fan and Minzu Basin. The simulated period is from January 2012 to December 2014 monthly. The total variables of hydraulic conductivity in four acquifers are 126, of vertical leakance are 96. There are 1080 net surface recharge, 3456 pumping in deep aquifer and 1332 net boundary flux temporal-spatial distribuation in all stress period. The result show that the error in the aquifer drops down very quickly than deeper aquifers because lots of decision variavles can affect aquifer.However, the RMSE of groundwater level in all aquifers are still about 1 m. The calibrated hydraulic conductivity and vertical leakence are mostly in reasonable limits, and the other flow decision variables are still in reasonable limits. The simulated groundwater level can reflect the approximately trendance in all acquifer and can capture the peak of the observed value in first acquifer. Hence, the established method of this study can effectively and accurately calibrate temporal-spatial distribution of groundwater flow and hydrogeological parameters. Finally, we can apply it in real situation and estimate it.

Los estilos APA, Harvard, Vancouver, ISO, etc.

19

Hsieh, I.-Huan y 謝亦歡. "Combining Principal Component Analysis and Empirical Orthogonal Function Development of Regional Groundwater Numerical Model Calibration Methodology. A Case Study of Ming-Chu Basin". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/739emg.

Texto completo

Resumen

碩士
國立臺灣大學
土木工程學研究所
105
This study is aimed to develop a regional groundwater numerical model calibration method. First, use principal component analysis (PCA) on the groundwater section to find out its temporal-spatial variable,and use it as a reference to create new assistance well. Then, applies empirical orthogonal function (EOF) with the change hydrograph of groundwater storage and simulated error hydrograph of groundwater level to quickly and accurately catch and calibrate the temporal-spatial distribuation of water recharge and hydrogeological parameters. The established method was applied on the groundwater system of Ming Chu Basin. This study is aimed to develop a groundwater numerical model calibration method. First, use principal component analysis (PCA) on the groundwater section to get its temporal-spatial variable distribution, and finding the line of eigenvalue=0, and create the new assistance well on it. After, setting the objective function is minimizing the the root mean square error (RMSE) of the simulated and observed groundwater level. The decision variables are horizontal hydraulic conductivity, vertical hydraulic conductivity and water recharge. There are three constraints of the optimization model: (1) the water recharge of groundwater system in every iteration of calibrating process must obey the mass balance; (2) the simulated groundwater level must follow the governing equation of groundwater flow; (3) the value of horizontal hydraulic conductivity and vertical hydraulic conductivity are restricted to a reasonable limits. The process of the optimization model sets the initial value of decision variables first, and inputs the variables to groundwater model. Thus, the groundwater level can be simulated and the objective function will be estimated. If the objective function doesn’t satisfy the stop condition, the simulated error hydrograph of groundwater level will be calculated and analyzed with EOF. Then, the modified decision variables is calculater according to the simulated error hydrograph of groundwater level end the result of EOF analysis. From iterations, the optimal temporal-spatial distribuation of surface water recharge and hydrogeological parameters can be obtain. This study applied the model on the calibration of the groundwater system in Ming Chu Basin. The simulated period is from January 2012 to December 2012 daily. The decision variables were selected in this study are horizontal hydraulic conductivity, vertical hydraulic conductivity of two acqufiers and rain water recharge, river water recharge and boundary water recharge of hydraulic conductivity in first acquifer. The result show that the RMSE is decreased dramatically in early iteration of the calibration and become smoothly after several iterations. The calibrated hydraulic conductivity and vertical leakence are in reasonable limits. The simulated groundwater level can reflect the approximately trendance in all acquifer and can capture the peak of the observed value in first acquifer. Hence, the established method of this study can effectively and accurately calibrate temporal-spatial distribution of surface water recharge and hydrogeological parameters.

Los estilos APA, Harvard, Vancouver, ISO, etc.

20

TruongVinh, Le y 黎長灣. "Application of Non-Dominated Sorting Genetic Algorithm in Calibration of HBV Rainfall-runoff Model: A Case Study of Tsengwen Reservoir Catchment in Southern Taiwan". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/tst626.

Texto completo

Resumen

碩士
國立成功大學
自然災害減災及管理國際碩士學位學程
104
The objective of this study is to apply a multi-objective optimization algorithm for tuning parameters of the HBV rainfall-runoff model. This study selected the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) as optimization algorithm and examined various objective functions for investigating the performance of the HBV model in different flow situations (e.g., low flow and high flow). Two objective functions were chosen in this study: root mean squared error (RMSE) and mean absolute percentage error (MPE). Previous studies (e.g., Getahun and Van Laned, 2015) showed that the HBV might give bias estimates for low and high flow situations. Thus, the study proposed a season-dependent calibration strategy for further improving the biased estimates in different flow situations. The strategy is composed of two parts: (1) the RMSE-based objective function is used for wet seasons only (i.e., high flow situations); (2) the MPE-based objective function is used for dry seasons only (i.e., low flow situations). The preliminary results suggest that the proposed season-dependent strategy can improve results.

Los estilos APA, Harvard, Vancouver, ISO, etc.

21

Beha, Andreas Karl Anton [Verfasser]. "Investigations on the thermal calibration of sedimentary basin models : a case study from the Horn Graben in the Danish North Sea / vorgelegt von Karl Anton Beha". 2007. http://d-nb.info/987839438/34.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

22

Hsieh, Min-Hsi y 謝旻希. "Establishment and Application of A Methodology for Numerical Model Calibration for Regional Groundwater Flow System - A Case Study of Hualien River Basin in East Rift Valley". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34639137579376179550.

Texto completo

Resumen

碩士
國立臺灣大學
土木工程學研究所
102
In order to properly manage the groundwater resources, we need a well calibrated numerical model to assess the effectiveness of various management strategies. 　This study aimed to be based on the methodology of numerical model calibration for regional groundwater flow system at home and abroad, then be supplemented and systematized to establish a set of numerical model calibration method, and applied which on Hualien River Basin in East Rift Valley for surveying its feasibility. 　The methodology proposed in this study is composed of 3 phases, including the identification of source/sink of groundwater system, parameter testing of a steady numerical model and parameter testing of a transient numerical model. First of all, to understand the feature of flow of regional groundwater system, the methodology utilized groundwater hydrograph analysis and oxygen isotopic tracer method to estimate the water balance and the recharge sources in study area. Secondly, the spatial distribution of source, sink and hydraulic conductivity were checked in steady-state simulation separately. Finally, the spatial distribution of storage coefficient and specific yield were checked in transient simulation. The process was iteratively corrected until the subdivision of storage coefficient and specific yield were fitted the previous corrected value. 　The results of the identification of source/sink of groundwater system practiced on the case of Hualien River Basin in East Rift Valley between 2008 to 2012 showed that, its annual average amount of recharge was 787 million tons ( recharge of precipitation accounted for 11.70%, recharge of river represented 63.53%, and the outer zone of groundwater recharge occupied 24.77%), the annual average loss amount was 813 million tons (pumping took up 7.03%, coastal loss constituted of 31.23%, and the seepage to the river stood at 61.74%) and the average annual storage changes was -26 million tons. 　The results of the numerical model of regional groundwater flow system used in the case of the daily model of Hualien River Basin in East Rift Valley indicated that, its annual average amount of recharge was 804 million tons ( recharge of precipitation accounted for 11.92%, recharge of river represented 67.03%, the outer zone of groundwater recharge occupied 21.05%, and the number difference between the total amount of recharge and the results of the system identification was 2.16%), the annual average loss amount was 773 million tons (pumping took up 7.39%, coastal loss constituted of 30.46%, the seepage to the river stood at 62.15%, and the number difference between the total amount of the outflow and the results of the system identification was 4.92%) and the average annual storage changes was 30 million tons. The root-mean-square error of Nanhua, Wuquan, Darong, Changqiao and Dafu reached to 2.52 meters, 0.29 meters, 1.65 meters, 2.90 meters and 2.57 meters, respectively. The hydraulic conductivity and specific yield were regulated within 1 order of magnitude. 　The results showed that the calibration method established in this study could initially simulate the groundwater flow situation of Hualien River Basin in East Rift Valley. Likewise, it could be used as a reference for simulations and various analyse in the future.

Los estilos APA, Harvard, Vancouver, ISO, etc.

23

Lin, Jui-Cheng y 林瑞承. "Feasibility Evaluation of the Calibration of Gas Turbine Online Fuel Flowmeter in Natural Gas Power Plant-A Case Study of Gas Turbine Unit in Combined Cycle Power Plant". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/84g5qj.

Texto completo

Resumen

碩士
中原大學
電機工程研究所
105
As an idiom, “a miss is as good as a mile”, it is the best description for how tiny errors lead to extreme inaccuracy of measurement. This study lists various kinds of gas flowmeters commonly used in Taiwan, explains their mechanisms, enumerates their differences, and introduces the standards of measurement issued by institutes in different countries as references to gas flow measurement. The power plant in our study uses a differential pressure flowmeter, which measures volumetric flow. The operating procedures included the inspection of the natural gas flow system in the power plant and each component of the gas flowmeter in the generator set. Calibration of the flow meter, in which the flowmeter shall be used as the test piece, was performed based on the methods proposed by the Instrument Society of America (ISA). Because of the difficulties and safety concerns of disassembling the flowmeter and sending to other domestic laboratories for calibration, the Coriolis force mass flowmeter was used as a standard meter and was connected in series to the flow meter in the generator set to measure the true flow. With the fact that mass flowmeters have characteristic of not being affected by the environment of pipelines, the data of the component of natural gas was collected by the Gas Chromatography (GC) in the power plant, the density of natural gas was calculated based on the standard of American Gas Association (AGA) 8, and the mass flow of the standard meter was converted into the referred volume flow. However, since the power plant was in operation and the standard meter cannot be installed on the pipeline. The data of actual operations was collected instead for analysis in this study. Through the internal Reynold Number vs Discharge Coefficient (Re vs Cd) table, and AGA 3 calculation function, the gradual corrected results of test meter can be simulated in order to reach the correction target.

Los estilos APA, Harvard, Vancouver, ISO, etc.

24

KimAnh, Do Thi y 杜晶安. "Calibrating HEC-HMS model for a catchment with limited data: Case study for Nong Son watershed, Thu Bon River, Vietnam". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/96258690274509505906.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Tesis sobre el tema "Calibration Case Study"

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros