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Literatura académica sobre el tema "Calibration chamber test"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Calibration chamber test"

Been, K., B. E. Lingnau, J. H. A. Crooks y B. Leach. "Cone penetration test calibration for Erksak (Beaufort Sea) sand". Canadian Geotechnical Journal 24, n.º 4 (1 de noviembre de 1987): 601–10. http://dx.doi.org/10.1139/t87-074.

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Interpretation of the cone penetration test in sands is generally based on empirical calibrations from tests in large-diameter calibration chambers. Although interpretation of these calibration data for clean sands in terms of the state parameter is expected to be broadly applicable to other sands, material-specific correlations are desirable for many projects. This paper describes a series of calibration chamber tests carried out on a sand dredged from the Beaufort Sea for construction of artificial islands. This Erksak sand is a uniformly graded, subrounded medium-grained sand with a fines content of 3–6%. The testing chamber described is 1.4 m in diameter, and allows independent control of vertical, horizontal, and back pressures on the sand sample. Samples of the sand were prepared by moist compaction to preserve the fines content, and then back pressure saturated.The chamber test data are presented and confirm that the Erksak sand fits the general trends observed for other sands very well. A method is also described that allows the interpretation to be consistent, even in the event that nonuniform void ratios occur in the samples. Measurements of horizontal stress behind the cone tip, which is a new development in cone penetrometer testing, are also presented. Key words: cone penetrometer, sands, in situ tests, state, calibration chamber, horizontal stress measurement.

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Hazen, John y L. Scorsone. "Infrared Sensor Calibration Facility". Journal of the IEST 35, n.º 1 (1 de enero de 1992): 33–40. http://dx.doi.org/10.17764/jiet.2.35.1.d536816582691754.

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The Boeing Infrared Sensor (BIRS) Calibration Facility represents a major capital investment by The Boeing Company in optical and infrared technology. The facility was designed and built for calibrating and testing new generation large aperture long wave infrared (LWIR) sensors, seekers, and related technologies. The capability exists to perform both radiometric and goniometric calibrations of large infrared sensors under simulated environmental operating conditions. The system is presently configured for endoatmospheric calibrations with a uniform background field that can be set to simulate the expected mission background levels. During calibration, the sensor under test is also exposed to expected mission temperatures and pressures within the test chamber. The facility could be converted for exoatmospheric testing. The first major test runs in the facility were completed during 1989 with very satisfactory results. This paper will describe system configuration and hardware elements, and will address the modifications made to date. Pitt-Des Moines. Inc. (PDM) of Pittsburgh, Pennsylvania, was the contractor for the turnkey design and construction of the test chambers and thermal vacuum systems. Hughes Danbury Optical Systems (formerly Perkin Elmer Optical Systems) was the hardware supplier for the optical hardware. The Boeing Company performed all optical assembly, integration, testing, and alignment on-site.

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Goh, Anthony T. C. "Neural Networks for Evaluating CPT Calibration Chamber Test Data". Computer-Aided Civil and Infrastructure Engineering 10, n.º 2 (marzo de 1995): 147–51. http://dx.doi.org/10.1111/j.1467-8667.1995.tb00277.x.

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Kurup, P. U., G. Z. Voyiadjis y M. T. Tumay. "Calibration Chamber Studies of Piezocone Test in Cohesive Soils". Journal of Geotechnical Engineering 120, n.º 1 (enero de 1994): 81–107. http://dx.doi.org/10.1061/(asce)0733-9410(1994)120:1(81).

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Teh, Cee-Ing. "Calibration Chamber Studies of Piezocone Test in Cohesive Soils". Journal of Geotechnical Engineering 121, n.º 5 (mayo de 1995): 454–56. http://dx.doi.org/10.1061/(asce)0733-9410(1995)121:5(454).

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Shweikani, R. y G. Raja. "Design, construct and test of a calibration radon chamber". Radiation Measurements 40, n.º 2-6 (noviembre de 2005): 316–19. http://dx.doi.org/10.1016/j.radmeas.2005.05.010.

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Shang, Jinkui, Ronghuan Zhao, Zhaonan Xu y Hongjie Zhong. "Research on global calibration technology of pressure sensitive paint based on airtight chamber". Journal of Physics: Conference Series 2364, n.º 1 (1 de noviembre de 2022): 012022. http://dx.doi.org/10.1088/1742-6596/2364/1/012022.

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Abstract Pressure sensitive paint (PSP) technology has been widely applied in wind-tunnel test. Generally, PSP calibration data are obtained using a calibration sample in laboratory priori calibration device, which the sample is sprayed at the same time with the test model.In this study, taking the real test model as the calibration object, a global calibration technology of PSP coating on the surface of the test model is proposed, which is verified in the airtight chamber, and the effective PSP calibration data are obtained. A two-component fast response PSP coating was used in the study. In the validation test, a flying wing model is used, the flying wing model sprayed with PSP coating was placed in the airtight chamber. 11 groups of calibration tests were carried out in the environment of 0.06 MPa ~ 0.14 MPa and 30°C ~50°C, and the calibration curves obtained showed good consistency.

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Gibbons, David. "Environmental Chamber Temperature Calibration: Which Method to Use?" Journal of the IEST 49, n.º 2 (1 de octubre de 2006): 8–15. http://dx.doi.org/10.17764/jiet.49.2.2603362qtt442142.

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Calibration of environmental simulation temperature test chambers is anything but simple. This article addresses factors that complicate attempts to calibrate these machines, and discusses strengths and weaknesses of various calibration approaches.

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Ridwan, M. y T. Taryo. "Implementation of Fuzzy Logic Controller for Pressure Sensor Calibration Chamber". International Journal of Automotive and Mechanical Engineering 18, n.º 2 (26 de julio de 2021): 8825–32. http://dx.doi.org/10.15282/ijame.18.2.2021.20.0676.

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Atmospheric pressure is a weather element that must be observed in the field of meteorology. Electronic barometers, aneroid barometers, mercury barometers are generally instruments for atmospheric pressure measurement. The barometer must be calibrated periodically to ensure the performance of the instrument. To achieve the best target uncertainty during calibration, besides using an accurate primary standard barometer, a stable pressure controller is also needed. Pressure calibration media using a pressurised test chamber is more beneficial due to its capability to accommodate all types of pressure sensors. However, pressurise test chamber still requires an operator to control and stabilise pressure inside the test chamber. In this study, fuzzy logic has been programmed into a microcontroller to control the solenoid valve and vacuum pump for regulating air pressure inside a pressurised test chamber automatically. Fuzzy logic changes the solenoid valve states periodically by varying the opening and closing times. The final result of this study is a comparison between the calibration results using pressure controller with fuzzy logic and without fuzzy logic with the same primary standard and unit under test. The result of expanded uncertainty without a fuzzy logic controller is 13.06 hectopascal. Meanwhile, the pressure calibration process using fuzzy logic to control pressure in pressurised test chamber achieve 0.09 hectopascal of expanded uncertainty in 1000 hectopascal pressure value with coverage factor, k=2, and confidence level of no less than 95 %.

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Straż, Grzegorz. "Preliminary investigations of organics soil in a new calibration chamber with the use of the FVT and DPL probe". E3S Web of Conferences 49 (2018): 00109. http://dx.doi.org/10.1051/e3sconf/20184900109.

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The proposal of investigations of soft organic soils in a new calibration chamber performed at the Rzeszow University of Technology has been presented in this paper. The unique feature of this chamber is the possibility of simultaneous soil testing with the use of two penetrometers: FVT (Field Vane Test) and DPL (Dynamic Probing Light). It has been possible due to the large size of the cylindrical soil sample: 62.5 cm in diameter and max. 80 cm high. Additionally, a construction with a new calibration chamber has been described, concerning potential capabilities and restrictions when conducting researches. The presented calibration chamber ensures the stability of the parameters set during the tests, which allows one to compare the test results and search for the relationship between the analyzed parameters. Shear strength from the FVT test was adopted as reference. The results of preliminary research were presented and a detailed research plan was prepared, which will be implemented in the next stages of the investigations.

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Tesis sobre el tema "Calibration chamber test"

Butlanska, Joanna. "Cone penetration test in a virtual calibration chamber". Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/279364.

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Cone penetration test (CPT) is a fast and reliable site investigation tool for exploring soils and soft ground. While the interpretation of the test results in clay has advanced considerably from a theoretical and numerical viewpoint that of tests in sands still relies largely on empirical correlations. A major source of such correlations comes from tests done in calibration chambers (CC), where soil state and properties might be tightly controlled. Calibration chambers are relatively large pieces of equipment, and calibration chamber testing is expensive and time consuming. Moreover, CC tests are performed on freshly reconstituted sands whose fabric may vary from that of natural sand deposits. Hence, correlations developed for one type of sand might not be suitable for another sand deposit. Numerical DEM-based calibration chambers might offer an interesting alternative to the more cumbersome physical tests. This study is the first attempt to perform a three-dimensional DEM-based simulation of cone penetration test. The three-dimensional commercial DEM code (PFC3D) is used to develop Virtual Calibration Chamber CPT (VCC CPT) model. To achieve that objective, several steps were necessary. First, calibration of an analogue discrete material to represent Ticino sand was performed using single-element tests. Afterwards, the mechanical response of the discrete material was further validated by performing additional triaxial tests with different initial conditions. The VCC CPT model was then constructed. Comprehensive dimensional analysis showed that the best option to balance computational efficiency and realism was to fill the chamber with a scaled-up calibrated discrete material. An original filtering technique was proposed to extract steady state cone resistances. A basic series of simulations was performed to explore the effect of initial stress and relative density in cone resistance. The results obtained from the simulations did fit closely the trends that had been previously established using physical chambers. That result was taken as a general validation of the proposed simulation approach. From the micromechanical point of view, the granular material is highly discontinuous and inhomogeneous. Obtaining a homogeneous initial state (especially in the zone of the penetrating cone) is crucial to obtain easily interpretable results. Specific procedures to assess initial state inhomogeneities were developed. DEM-based models can provide results at various level of resolution i.e. the microscale, the meso-scale and the macro-scale. A large series of VCC CPT has been performed. Simulations were performed for models with different horizontal servo-control walls, various sizes of chamber, cone and particles and two boundary conditions. The results were analyzed, focusing on aspects such as chamber size, particle size and boundary condition effects on steady state cone resistance values. A smaller number of tests have also been examined from the point of view of shaft resistance. Most trends and results obtained are shown to be in agreement with previous physical tests. When disagreements appear, the causes are identified: the most severe disagreements result from initial inhomogeneities in the discrete model. The work described in this thesis showed ease the burden of future CPT calibrations in granular materials.
Los ensayos de penetración estática de cono (CPT) son una de las herramientas más importantes en el reconocimiento geotécnico. La interpretación de los resultados de ensayo en arcilla ha avanzado considerablemente desde un punto de vista teórico y numérico. Sin embargo la interpretación de los resultados en los materiales granulares por ejemplo arena) todavía está basada en correlaciones empíricas provenientes de las pruebas realizadas en cámaras de calibración (CC), donde el estado del suelo y sus propiedades pueden ser controlados. Las cámaras de calibración son equipos relativamente grandes, y los ensayos en ellas son bastante costosos en tiempo y recursos. Por otra parte, las pruebas se realizan en muestras de arenas reconstituidas cuyas propiedades varían respecto de los depósitos naturales de donde provienen. Por lo tanto, las correlaciones desarrolladas en un tipo de arena podrían no ser adecuadas para otro depósito distinto. Cámaras de calibración numéricas (virtuales) basadas en el método de elementos discretos (DEM) podrían ofrecer una alternativa interesante a los ensayos físicos. Este estudio es el primer intento de realizar una simulación basadas en el método de los elementos discretos tridimensionales de ensayos de penetración de cono. El código comercial tridimensional (PFC3D) ha sido usado para desarrollar el modelo de CPT de Cámara de Calibración Virtual (CPT VCC). Para alcanzar este objetivo fueron necesarios varios pasos. En primer lugar, se llevó acabo la calibración de un material discreto análogo a arena de Ticino mediante ensayos elementales. A continuación se construyó el modelo CPT VCC. Un análisis dimensional exhaustivo mostró que la mejor opción para crear un modelo eficiente y real era llenar la cámara con un material con el tamaño de grano 50 veces mayor que el de la arena de Ticino. Se propuso una técnica original de filtrado para extraer la resistencia de punta estacionaria. Se realizó una serie básica de simulaciones para explorar el efecto de la tensión inicial y la densidad relativa sobre la resistencia de cono. Los resultados obtenidos de las simulaciones se ajustan estrechamente a las tendencias establecidas previamente en cámaras físicas. Este resultado fue tomado como una validación general del programa de simulación propuesto. Desde el punto de vista de la micro-mecánica, el material granular es muy discontinuo y no homogéneo. La obtención de un estado inicial homogéneo (especialmente en la zona de penetración del cono) es crucial para obtener resultados fácilmente interpretables. Por lo tanto se han desarrollado procedimientos específicos para evaluar heterogeneidades del estado inicial. Los resultados manifestaron el papel clave del contorno de modelo (paredes rígidas), tanto pasivo como activo (servo-controlados), durante la formación del modelo. Los modelos basados en el DEM puede proporcionar resultados a varios niveles de la resolución, es decir del micro-, meso- y macro escala. Se ha realizado una gran serie de VCC CPT. Las simulaciones se realizaron para modelos con diferentes posiciones en las paredes horizontales de servo-control, varios tamaños de cámara, varios tamaños del cono y de las partículas y dos condiciones de contorno. Los resultados se analizaron centrándose en varios aspectos como el tamaño de la cámara, el tamaño de las partículas y los efectos de condiciones de contorno sobre el valor de la resistencia de punta. Un número limitado de los CPT fue examinado desde el punto de vista de la resistencia del fuste del cono. Se observó que la mayoría de las tendencias y los resultados obtenidos estaban de acuerdo con resultados previos obtenidos en ensayos físicos. El trabajo presentado en esta tesis debería facilitar futuras calibraciones CPT en materiales granulados.

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Bauer, Zachary Obenour. "A Calibration Method for a Controlled Reception Pattern Antenna and Software Defined Radio Configuration". Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1357402542.

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Cucciarrè, Francesca. "Numerical and experimental methods for design and test of units and devices on BepiColombo Mission". Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423379.

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In this thesis work several numerical and experimental methods for design and test of units and devices onboard BepiColombo Mission are studied, implemented and described. BepiColombo Mission is the result of the joined efforts of European Space Agency and Japanese Space Agency: in 2015 two different orbiters (ESA Mercury Planetary Orbiter, MPO, which will support remote sensing and radio-science instrumentation, and JAXA Mercury Magnetospheric Orbiter, MMO) will be launched in the direction of Mercury to study the surface composition and morphology, the geology and the magnetosphere of the planet closest to the Sun. Italy plays an important role in the mission since it is involved in the design and development of the Spectrometer and Imagers for Mpo Bepicolombo Integrated Observatory SYStem (SIMBIO-SYS): this integrated package of instruments includes an imaging system with stereo (STC) and high spatial resolution (HRIC) capabilities along with a hyperspectral imager (VIHI) in the visible and near infrared range. Due to the proximity to the Sun, MPO will face an extremely harsh environment from a thermal point of view, therefore the orbiter, and in particular instrumentation exposed to the thermal fluxes, shall be equipped with sophisticated thermal control devices, such as baffling systems for heat rejection. Starting from the deep knowledge of the thermal scenario in which units and baffles will operate, thanks to the results obtained from detailed thermal and mathematical models, different innovative test-beds have been conceived and designed in order to simulate the environmental thermal fluxes in laboratory. At first, the Structural Thermal Models of SIMBIO-SYS baffles have been tested, subjecting the devices to the environmental infrared fluxes provided by infrared lamps and cold sources in vacuum conditions and assuring different temperature levels on the thermal interfaces of the units; after the test campaign, the thermal mathematical models of the baffles themselves have been validated thanks to the correlation with the experimental results, providing some useful information on the design of the Flight Models of the baffles. Afterwards an original set-up to test the Qualification Model of the Stavroudis baffle of HRIC unit has been designed: during tests, scheduled in January and February 2013, also solar fluxes will be simulated, thanks to CISAS solar simulator, with the aim to qualify the instrument reproducing in vacuum the maximum and minimum operative and non operative temperatures and the most critical heat fluxes (solar and infrared) in sequence. In parallel to this activity, from the need to calibrate and qualify the units in space-like environment simulating the operative conditions, two thermal vacuum chambers have been designed: calibration will be performed for HRIC and STC-VIHI units separately, with and without baffles. The activity started from the comprehension of the instruments calibration requirements and proceeded with the conceptual design of the units, the detailed thermal, structural and electrical design and concluded with the procurement, the assembling and the test activity, which has been performed in order to verify the initial requirements. Thanks to these activities, a series of methods, procedures and techniques, both numerical and experimental, have been developed and validated, with the aim to provide an original and useful contribution to the design and test of SIMBIO-SYS suite onboard BepiColombo mission
L’anno 2015 vedrà l’inizio della missione BepiColombo, promossa dall’Agenzia Spaziale Europea (ESA) in collaborazione con l’Agenzia Spaziale Giapponese (JAXA): la missione scientifica permetterà di approfondire la conoscenza di Mercurio, il pianeta più interno del Sistema Solare, studiandone la superficie, la composizione interna e il campo magnetico, consentendo inoltre di investigare sulle cause che hanno portato alla nascita dei pianeti e sulla loro evoluzione nel tempo. Il segmento di volo è costituito da 2 satelliti distinti: il Mercury Planet Orbiter (MPO), sotto la diretta responsabilità dell’ESA, che supporta la strumentazione per remote sensing e radioscienza, e il Mercury Magnetospheric Orbiter (MMO), che supporta la strumentazione per lo studio del campo magnetico e che è assegnato al controllo della JAXA. L’Italia riveste un ruolo fondamentale nell’ambito della missione dal momento che l’Agenzia Spaziale Italiana è coinvolta nella progettazione e nello sviluppo della suite SIMBIO-SYS (Spectrometer and Imagers for Mpo Bepicolombo Integrated Observatory SYStem), un pacchetto integrato di strumenti costituito da un sistema per imaging stereo (STC), da un sistema per imaging ad alta risoluzione (HRIC) e da uno spettrometro nel campo delle lunghezze d’onda del visibile e dell’infrarosso (VIHI). A causa della vicinanza del pianeta al Sole, MPO opererà in un ambiente ostile ed estremo dal punto di vista termico, di conseguenza il satellite e la strumentazione saranno dotati di sofisticati sistemi per il controllo termico attivo e passivo (ad esempio sistemi di baffling per la reiezione dei flussi). Partendo dalla comprensione e dalla conoscenza dello scenario termico in cui la strumentazione si troverà ad operare, grazie ai risultati dei modelli matematici previsionali, sono stati ideati e progettati diversi setup sperimentali innovativi al fine di simulare in laboratorio i flussi termici ambientali. Inizialmente è stata condotta una campagna di test sui modelli termo-strutturali (STM) dei baffles di SIMBIO-SYS, sottoponendo i dispositivi al flusso infrarosso planetario, simulato da lampade infrarosse e sorgenti fredde in condizioni di vuoto e assicurando diversi livelli di temperature alle interfacce termiche delle unità. In seguito alla campagna di test, i modelli matematici e termici dei baffles sono stati validati, mediante la procedura di correlazione con i risultati sperimentali; grazie alla validazione, è stato quindi possibile raffinare i modelli termici del modello da volo dei baffles. In secondo luogo è stato ideato e progettato un set-up per testare il Qualification Model del baffle Stavroudis di HRIC: durante i test, in programma per gennaio e febbraio 2013, saranno simulati anche i flussi solari, grazie all’innovativo simulatore solare progettato al CISAS, allo scopo di qualificare lo strumento riproducendo in vuoto le minime e massime temperature operative e non operative e i flussi termici (solare e infrarosso) più critici. All’attività precedentemente descritta è stato affiancato il design di due camere termovuoto che verranno utilizzate in fase di calibrazione e qualifica dei modelli da volo di STC, VIHI e HRIC, con e senza baffles. A partire dall’analisi delle prestazioni degli strumenti e da una serie di requisiti meccanici, termici, elettrici, di vuoto, di cleanliness e contamination, è stato effettuato uno studio di fattibilità, a cui sono seguiti il design preliminare delle camere, una serie di analisi strutturali e termiche di dettaglio (per simulare in camera da vuoto le interfacce meccaniche e termiche degli strumenti), la progettazione elettrica, il procurement dei componenti e l’attività di test sui sistemi progettati, al fine di verificare i requisiti iniziali imposti. Grazie a queste attività, sono stati sviluppati e validati una serie di metodi, procedure e tecniche, sia dal punto di vista numerico che sperimentale, al fine di fornire un contributo utile ed originale alla progettazione e alla verifica della strumentazione della suite SIMBIO-SYS a bordo della missione BepiColombo

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Hofman, Jiří. "Testovací metody pro hodnocení radiačních efektů v přesných analogových a signálově smíšených obvodech pro aplikace v kosmické elektronice". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401588.

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The traditional radiation testing of space electronics has been used for more than fifty years to support the radiation hardness assurance. Its typical goal is to ensure reliable operation of the spacecraft in the harsh environment of space. This PhD research looks into the radiation testing from a different perspective; the goal is to develop radiation testing methods that are focused not only on the reliability of the components but also on a continuous radiation-induced degradation of their performance. Such data are crucial for the understanding of the impact of radiation on the measurement uncertainty of data acquisition systems onboard research space missions.

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BARROS, GUSTAVO A. S. J. "Projeto de um laboratorio integrado de calibracao de instrumentos no IPEN". reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9372.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Lazar, Václav. "Kalibrace experimentálního zařízení pro testování kosmických technologií". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401523.

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Diplomová práce se zabývá možnosti kalibrace experimentálního testovacího zařízení. Zejména se věnuje návrhu termálního matematického modelu popisujícího tepelné procesy uvnitř zařízení v průběhu měření tepelné vodivosti vzorku. První část práce je věnována seznámení se s testovacím zařízením, jeho limity a principem měření. Popisuje řešení třetí verze testovací komory, společně s nezbytnými úpravami, provedenými za účelem zajištění předepsaných simulačních podmínek. Zmiňuje také potřebu a důvody kalibrace. Druhá část je především zaměřená na návrh kalibračních vzorků a termálního modelu. Uvádí definované požadavky a konečné vlastnosti vyrobených vzorků. Matematický model prezentuje postup výpočtu zjištěných tepelných ztrát a poukazuje na možnosti jejich zpřesnění. Testování kalibračních vzorků bylo provedeno na nově zprovozněné třetí verzi testovací komory. Naměřené výsledky poslouží k ladění termálního modelu, nezbytného k dokončení kalibračního procesu, který umožní přikročení k další fázi testování v experimentální komoře.

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Giusti, Ilaria. "Improvement of piezocone test interpretation for partial drainage conditions and for transitional soils". Doctoral thesis, 2017. http://hdl.handle.net/2158/1138812.

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The present study shows the results of experimental analyses of field cone penetration tests as well as calibration chamber mini-piezocone tests on soils of intermediate permeability (silts, clayey and sandy silts). The penetration rate varied across over three orders of magnitude to provide information on partially drained and undrained tip resistance, excess pore water pressure and friction sleeve. Whilst previous experimental researches essentially focused on tip resistance and pore water pressure measurements, it is worthwhile underlying that the present study is one of the first experimental studies that explored the effect of penetration rate on sleeve friction measurements. As the penetration rate is reduced, moving from the undrained conditions to the fully drained conditions, friction sleeve systematically decreases, together with the expected results in terms of increasing tip resistance and decreasing excess porewater pressure. The obtained experimental database of penetration measurements on intermediate soils can be added to the previous worldwide collected data to develop a new general interpretation procedure for cone tests in transitional soils. Besides, numerical analyses have been carried out by using the Finite Element Method. The Updated Lagrangian technique has been adopted to simulate the large strain penetration process. Both the Modified Cam Clay constitutive model and the Mohr Coulomb model have been used to compare numerical simulation results with, respectively, the experimental results on kaolin clay (Randolph and Hope, 2004; Schneider et al., 2007) and those obtained with the present study. The problem of piezocone miss-interpretation in case of transitional soils, such as loose silt mixture has been dealt with an empirical methodology, based on the calibration of the Soil Behaviour Type index using soil characteristics inferred from reference boreholes. Moreover, a new approach has been proposed to overcome miss-interpretation of piezocone test results for soil layers belonging to vadose zones in which the effective stress state is controlled by suction. This procedure allows for the correction of the Soil Behaviour Type (SBT) index, in order to allocate correctly the investigated soils inside SBT classification charts (Robertson, 1990). In addition to that, the applied method has suggested a procedure, based on piezocone measurements, to estimate the effective stress state in the case of a homogeneous soil layer in which a vadose zone above the water table is present.

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Wang, Toong-Lih y 王統立. "CPT Chamber Calibration Tests in High Fines Content Silty Sand". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/09974404996149501498.

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碩士
國立交通大學
土木工程系
88
Because of the lack of cohesion, it is very difficult to obtain undisturbed samples for sand. In situ tests are often used to determine the engineering properties of sand. The cone penetration test (CPT) is a popular in situ test method. As in many other types of in situ test methods, the interpretation of CPT is mostly empirical. These empirical interpretation rules are mostly developed based on chamber calibration tests in the laboratory, and limited theoretical considerations. Most of the available empirical rules came from Europe or Northern America, based on tests in uniformly graded, clean sand. The sand on the West Coast of Taiwan, including that at the 6th Naptha project site in Mai Liao, Yuen Lin, contains significant amount of silt. Experiments have indicated that this type of sand is compressible and crushable,and has less tendency to dilate. Differences in engineering properties between uniformly graded clean quartz sand and silty sand with different mineral contents can be significant. Hence, to directly adopt the empirical CPT interpretation rules developed for clean quartz, to the sand on the West Coast of Taiwan is not desirable. The main objective of this research project is to evaluate the feasibility of the existing empirical CPT interpretation methods for Mai Liao silty sand (MLS), and establish new empirical methods for the interpretation of CPT performed in Mai Liao silty sand.A series of dry and saturated CPT calibration tests have been conducted in sand with fines contents as high as 50%. This thesis describes the background of the research, its objectives, research approach, procedures of the CPT calibration tests and test results. The CPT data are analyzed and a new empirical rule is proposed specifically for CPT in silty sand.

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Chen, Simon. "Test et calibrations technologiques avec PICO-0.1 pour les futurs détecteurs de chambre à bulle de matière sombre de PICO". Thesis, 2020. http://hdl.handle.net/1866/24366.

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Parmi les douzaines d’expériences qui visent à découvrir la matière sombre, l’expérience de détection directe PICO utilise des détecteurs à liquide surchauffé comme moyen pour s’y prendre. La chambre à bulle PICO-40L remplie de C3F8, présentement située dans le laboratoire sous-terrain SNOLAB, est en cours de test en vue d’une recherche aveugle de WIMP (Weakly Interacting Massive Particle) d’une durée de 1 an. Pour assurer la stabilité du détecteur pendant les périodes de préparation et pendant l’acquisition de données, un logiciel de surveillance a été écrit. Un moyen fiable de surveiller les paramètres importants du détecteur et d’envoyer des alarmes en cas d’urgence joue un rôle important à non seulement au succès de PICO-40L, mais aussi au développement du futur détecteur PICO-500. Située à l’Université de Montréal, la chambre à bulle PICO-0.1 a été conçue afin de calibrer les nombreux événements de fond qui se présentent dans ce type de détecteur. De plus, cette chambre à bulle a été utilisée comme première tentative au monde de mesurer la diffusion Thomson sur un noyau d’atome en exposant le détecteur rempli de C3F8 à une source de gamma produite par la réaction 19F proton à alpha et gamma 16O à l’aide d’un faisceau de protons crée par l’accélérateur de particules de l’Université de Montréal. Ce type d’interaction s’avérera à un événement de fond important pour les expériences de détection directe de matière sombre à bas seuil.
Amongst the dozens of experiments aiming to be the first to claim a dark matter signal, PICO is a direct dark matter detection experiment that utilizes superheated liquid detectors as a means of doing so. The latest C3F8 filled PICO-40L bubble chamber currently located in the SNOLAB underground laboratory is under testing to prepare for a 1 live-year blinded WIMP (Weakly Interacting Massive Particle) search. To ensure the stability of the detector during both the testing and the data acquisition phases, a monitoring software was coded. A reliable way to monitor all the parameters and to send alerts accordingly plays an important role in not only the success of PICO-40L, but also the development of the future larger-scale PICO-500 detector. PICO-0.1 is a test bubble chamber located at the University of Montreal that was built to calibrate for the numerous background events that can occur in this kind of technology. This test chamber was also used as a world’s first attempt to measure the coherent (Thomson) photon scattering onto a nucleus by exposing the C3F8 filled detector to a gamma source produced by the 19F proton to alpha and gamma 16O reaction using a proton beam created by the University of Montreal particle accelerator. This kind of interaction will prove to be a significant background for future sub-keV direct dark matter detection experiments.

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Libros sobre el tema "Calibration chamber test"

Kelly, Abeyounis William y Langley Research Center, eds. 16-foot transonic tunnel test section flowfield survey. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1994.

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K, Abeyounis W. y Langley Research Center, eds. 16-foot transonic tunnel test section flowfield survey. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1994.

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T, Pickett Mark, Soeder Ronald H y Lewis Research Center, eds. Baseline calibration of the NASA Lewis Research Center 8- by 6-foot supersonic wind tunnel (1991 and 1992 tests). [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Center, Langley Research, ed. Cryogenic pressure calibrator for wide temperature electronically scanned (ESP) pressure modules. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 2001.

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16-foot transonic tunnel test section flowfield survey. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1994.

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Low speed calibration of the NASA Lewis Research Center 8- by 6-foot supersonic wind tunnel (1995 test): Under contract NAS3-27186. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Capítulos de libros sobre el tema "Calibration chamber test"

Airoldi, Sergio, Alberto Bretschneider, Vincenzo Fioravante y Daniela Giretti. "Validation of In-Situ Probes by Calibration Chamber Tests". En Springer Series in Geomechanics and Geoengineering, 659–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97112-4_147.

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Song, Y., X. Q. Gu y J. Hu. "DEM-FDM coupling simulation of cone penetration tests in a virtual calibration chamber". En Cone Penetration Testing 2022, 703–7. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003329091-103.

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Skrede, H., H. B. Hammer, S. Nordal y J. S. L’Heureux. "CPTU-detection of thin clay layers in sand: Results from calibration chamber tests". En Cone Penetration Testing 2022, 690–96. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003329091-101.

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"Calibration chamber test data". En Soil Liquefaction, 549–76. CRC Press, 2015. http://dx.doi.org/10.1201/b19114-16.

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Actas de conferencias sobre el tema "Calibration chamber test"

He, Jinliang, Zhiyong Yuan, Rong Zeng, Shuiming Chen, Bo Zhang y Fan Wu. "Evaluation of Test Reproducibility of Calibration in Reverberation Chamber". En 2007 IEEE International Symposium on Electromagnetic Compatibility. IEEE, 2007. http://dx.doi.org/10.1109/isemc.2007.203.

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Meier, Rudolf H. y Clyde A. Randolph. "Surveillance Sensor Test Chamber: System Design Concepts Of Internal Calibrator And Of Calibration Sources". En 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, editado por R. Barry Johnson y Milton J. Triplett. SPIE, 1988. http://dx.doi.org/10.1117/12.947139.

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Mende, Michael. "Calibration Of Infrasound Measurement Devices". En NCSL International Workshop & Symposium. NCSL International, 2016. http://dx.doi.org/10.51843/wsproceedings.2016.42.

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Infrasound measurement devices like low frequency microphones and dynamic pressure sensors are widely used in many branches of trade like aerospace industries (airflow mechanics) or acoustical engineering (infrasound measurements of geophysical events, emissions of wind energy plants, etc.). This paper presents a calibration system that allows the calibration of such devices in a frequency range as low as 0.1 Hz to 31.5 Hz. It is based on a special low frequency pressure chamber that uses a similar working principle as a pistonphone but is adapted to the requirements of this low frequency range. The chamber has a size that allows to place the whole device under test (DUT) inside the chamber. So no mechanical adaption between DUT and pressure chamber is required and thus the DUT can have a nearly arbitrary shape. Other than a pistonphone which is based on the assumption that the sound level can be calculated from the physical dimensions of the chamber by means of the adiabatic gas law, this calibration system requires the use of a reference standard sensor. This is due to the fact that in the low frequency range the gas compression becomes more and more an isothermal process the lower the applied frequency gets. Thus a pressure sensor is used as reference standard allowing high precision measurements (uncertainty < 0.05 dB). The paper discusses the question how the measurement uncertainty over the whole frequency can be determined although the reference pressure sensor is only calibrated by static pressure calibration. It also shows how other parameters like the homogeneity of the pressure field can be determined that contribute to the measurement uncertainty. Finally some calibration results will be presented.

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Colak, Bektas. "A comparative study on the calibration of Frequency domain reflection measurements for a compact test chamber". En 2016 9th International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW). IEEE, 2016. http://dx.doi.org/10.1109/msmw.2016.7538175.

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Ayala Torres, Juan, Andries Fourie y David Reid. "Development of a new large calibration chamber for testing thickened tailings with the cone penetration test". En 23rd International Conference on Paste, Thickened and Filtered Tailings. Gecamin Publications, Santiago, 2020. http://dx.doi.org/10.36487/acg_repo/2052_51.

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Platte, Thomas. "Development of a Primary Dynamic Calibration Method for Pressure Sensors". En 19th International Congress of Metrology (CIM2019), editado por Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201927006.

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An increasing research activity in the field of dynamic calibration of pressure transducers can be recognized at some national metrology institutes. As an example the EMPIR project “development of measurement and calibration techniques for dynamic pressures and temperatures” can be named. Despite that efforts, no national reference standard for dynamic pressure calibration is available up to now. This makes the measurement of high fluctuating pressure signals difficult and unprecise. These dynamic pressure signals appears in aerospace applications, blast test and almost every fluidic circuit which employs discontinuous discharge elements. To address that topic the authors developed a sine calibration apparatus to measure the frequency response of pressure transducers with sufficient amplitudes up to 1.2 MPa. Due to the construction of the pressure generator frequencies up to 10 kHz can be reached. Furthermore a calibration technique was developed to calculate the pressure inside a chamber primarily. The fundamental idea is to calculate the pressure based on the displacement of a piston in a pistonphone device. To do so the author had to analyses the thermodynamic conditions inside the fluid filled chamber. The paper shows that the fundamental approach was confirmed by measurements.

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Patankar, Gaurav, Simone Mancin, Justin A. Weibel, Suresh V. Garimella y Mark A. MacDonald. "A Method for Thermal Performance Characterization of Ultra-Thin Vapor Chambers Cooled by Natural Convection". En ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48175.

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Vapor chamber technologies offer an attractive approach for passive cooling in portable electronic devices. Due to the market trends in device power consumption and thickness, vapor chamber effectiveness must be compared with alternative heat spreading materials at ultra-thin form factors and low heat dissipation rates. A test facility is developed to experimentally characterize performance and analyze the behavior of ultra-thin vapor chambers that must reject heat to the ambient via natural convection. The evaporator-side and ambient temperatures are measured directly; the condenser-side surface temperature distribution, which has critical ergonomics implications, is measured using an infrared camera calibrated pixel-by-pixel over the field of view and operating temperature range. The high thermal resistance imposed by natural convection in the vapor chamber heat dissipation pathway requires accurate prediction of the parasitic heat losses from the test facility using a combined experimental and numerical calibration procedure. Solid Metal heat spreaders of known thermal conductivity are first tested, and the temperature distribution is reproduced using a numerical model for conduction in the heat spreader and thermal insulation by iteratively adjusting the external boundary conditions. A regression expression for the heat loss is developed as a function of measured operating conditions using the numerical model. A sample vapor chamber is tested for heat inputs below 2.5 W. Performance metrics are developed to characterize heat spreader performance in terms of the effective thermal resistance and the condenser-side temperature uniformity. The study offers a rigorous approach for testing and analysis of new vapor chamber designs, with accurate characterization of their performance relative to other heat spreaders.

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Yang, W. Q., A. Chondronasios, S. Nattrass, V. T. Nguyen, M. Betting, I. Ismail y H. McCann. "Adaptive Calibration of a Capacitance Tomography System for Imaging Water Droplets Distribution". En ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58538.

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A highly-sensitive electrical capacitance tomography (ECT) system based on an HP4284 impedance analyser has been developed and used to quantify low concentration multiphase flows in wet gas separation processes. The system hardware provides high accuracy (0.05%) and high resolution (10−17 F). The sensor was calibrated in an environmental chamber with solid samples of known permittivity over ranges of temperature and humidity. Adaptive calibration and adjacent electrode pair correction techniques were applied to image very low concentration profiles. This paper describes the techniques used and presents the experimental results obtained from a test flow rig called Twister, which has been designed to separate liquid droplets from wet gas streams. The test results over a range of operating conditions (20% to 95% humidity) demonstrate that the ECT system is capable of reconstructing clear images of the droplet distribution inside Twister. Changes as small as 1 gWater/kgAir in the droplets form liquid were detectable. It has also shown that the concentration of the condensable phase can be estimated quantitatively within 20% in comparison with the reference measurements.

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Gokhale, Manoj, Bhaskar Tamma, Roy J. Primus y Benzi John. "SFC Benefit With Split Injection in Two-Stroke Diesel Engine". En ASME 2009 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ices2009-76022.

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The influence of split-injection on engine performance is studied using system and in-cylinder simulation of a two-stroke medium speed diesel engine. System level models for the engine and fuel system and a multi-dimension CFD model for the combustion chamber were developed and calibrated with experimental data. Calibration of these models from the available test data is discussed and calibration results are presented. The SFC and NOx predictions show good sensitivity to injection timing variation. These calibrated models were then used to simulate split injection through the modification of the fuel injector. Split injection achieved through this modification results in fuel savings while maintaining same NOx levels.

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Rhyner, Daniel J. "Evaluation of Horizontal Recirculatory Air Curtain Efficiencies: Cooler to Conditioned Space". En ASME 2014 Citrus Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/cec2014-5801.

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Air curtains have long been used to reduce losses from high traffic doorways in cold storage facilities. Different varieties of air curtains have been used including vertical (down blast) non-recirculatory, horizontal non-recirculatory and horizontal recirculatory. The effectiveness of air curtains to provide thermal separation between rooms of differing temperatures has long been a matter of debate. Previous experiments have been done to determine the effectiveness using tracer gas decay methods. This paper will evaluate the thermal effectiveness of the horizontal recirculatory air curtain when applied in a typical cooler application using an environmental chamber. This allowed testing of the air curtain’s ability to reduce infiltration on the actual thermal envelope. A vertical non-recirculatory air curtain was also evaluated for comparison purposes. The air curtains were tested in an environmental chamber that was divided into two rooms of differing temperature. The chamber was instrumented to measure all energy transfer into and out of each room. The cold room was maintained at a temperature of 4°C (39°F) and the warm room was maintained at a temperature of 24°C (75°F) and 60% RH throughout all tests. Three phases of testing were conducted for each air curtain to completely evaluate all energy losses — a completely closed doorway test for calibration, a completely open doorway test with no air curtains and an open doorway test with the air curtains adjusted and running. Completion of the testing revealed the horizontal recirculatory air curtain had a thermal efficiency of 71% while the vertical non-recirculatory air curtain had an efficiency of 38%. The results were slightly lower than theoretical calculations which may be attributable to chamber size. Additional tests were conducted using a smaller doorway for comparison. Applying the results from the smaller doorway yields an effectiveness of 76.2%. Using the theoretical open doorway energy loss yields an effectiveness of 80%. Paper published with permission.

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